ACS730KLCTR-40AB-T - ALLEGRO MICROSYSTEMS

The Allegro™ ACS730 current sensor family provides

economical and precise solutions for AC or DC current sensing

in industrial, commercial, and communications systems. The

device package allows for easy implementation by the customer.

Typical applications include motor control, load detection and

management, switched-mode power supplies, and overcurrent

fault protection.

The device consists of a precise, low-offset, linear Hall

sensor circuit with a copper conduction path located near the

surface of the die. Applied current flowing through this copper

conduction path generates a magnetic field which is sensed by

the integrated Hall IC and converted into a proportional voltage.

Device accuracy is optimized through the close proximity of the

magnetic field to the Hall transducer. A precise, proportional

voltage is provided by the Hall IC, which is programmed

for accuracy after packaging. The output of the device has a

positive slope when an increasing current flows through the

primary copper conduction path (from pins 1 and 2, to pins 3

and 4), which is the path used for current sensing. The internal

resistance of this conductive path is typically 1.2 mΩ, providing

low power loss.

The terminals of the conductive path are electrically isolated

from the sensor leads (pins 5 through 8). This allows the

ACS730 current sensor to be used in high-side current sense

applications without the use of high-side differential amplifiers

or other costly isolation techniques.

The ACS730 is provided in a small, low-profile surface-mount

SOIC8 package. The leadframe is plated with 100% matte tin,

which is compatible with standard lead (Pb) free printed circuit

board assembly processes. Internally, the device is Pb-free,

except for flip-chip high-temperature Pb-based solder balls,

currently exempt from RoHS. The device is fully calibrated

prior to shipment from the factory.

ACS730-DS, Rev. 8

MCO-0000147

• Industry-leading noise performance with greatly

improved bandwidth through proprietary amplifier and

filter design techniques

• High bandwidth 1 MHz analog output

• Patented integrated digital temperature compensation

circuitry allows high accuracy over temperature in an

open loop sensor

• 1.2 mΩ primary conductor resistance for low power loss

and high inrush current withstanding capability

• Small footprint, low-profile SOIC8 package suitable for

space-constrained applications

• Integrated shield virtually eliminates capacitive coupling

from current conductor to die due to high dV/dt voltage

transients

• 5 V, single supply operation

• Output voltage proportional to AC or DC current

• Factory-trimmed sensitivity and quiescent output voltage

for improved accuracy

• High PSRR for noisy environments

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

Typical Application

The ACS730 outputs an

analog signal, VIOUT, that

varies linearly with the

bidirectional AC or DC

primary sensed current,

, within the range speci-

ed.

FEATURES AND BENEFITS DESCRIPTION

PACKAGE: 8-Pin SOIC (suffix LC)

Not to scale

ACS730

BYPASS

0.1 µF

ACS730

IP+

IP–

VCC

VIOUT

VZCR

GND

CVZCR

1 nF

December 13, 2018

CB Certicate Number:

US-32848-UL

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

SELECTION GUIDE

Part Number

Optimized

Range, IP

(A)

Sensitivity [1],

Sens(Typ)

(mV/A)

(°C) Packing [2]

ACS730KLCTR-20AB-T ±20 100

–40 to 125 Tape and reel, 3000 pieces per reel

ACS730KLCTR-30AB-T ±30 66

ACS730KLCTR-30AU-T 30 120

ACS730KLCTR-40AB-T ±40 50

ACS730KLCTR-40AU-T 40 100

ACS730KLCTR-50AB-T ±50 40

ACS730KLCTR-65AB-T ±65 30

ACS730KLCTR-80AU-T 80 50

[1] Measured at VCC = 5 V.

[2] Contact Allegro for additional packing options.

ISOLATION CHARACTERISTICS

Characteristic Symbol Notes Value Units

Dielectric Strength Test Voltage VISO

Agency type-tested for 60 seconds per UL standard

60950-1 (edition 2); production-tested at VISO for 1

second, in accordance with UL 60950-1 (edition 2).

2400 VRMS

Agency type-tested for 60 seconds per UL 1577 (edition 5);

production-tested at 2520 VRMS for 1 second, in

accordance with UL 1577 (edition 5).

2100 VRMS

Working Voltage for Basic Isolation VWVBI

Maximum approved working voltage for basic (single)

isolation according to UL 60950-1 (edition 2).

420 VPK or VDC

297 VRMS

Clearance Dcl Minimum distance through air from IP leads to signal leads 3.9 mm

Creepage Dcr

Minimum distance along package body from IP leads to

signal leads 3.9 mm

ABSOLUTE MAXIMUM RATINGS

Characteristic Symbol Notes Rating Units

Supply Voltage VCC 6 V

Reverse Supply Voltage VCC(R) –0.1 V

Output Voltage VIOUT 6 V

Reverse Output Voltage VIOUT(R) –0.1 V

Zero Current Reference Voltage VZCR 20 V

Reverse Zero Current Reference Voltage VZCR(R) –0.1 V

Operating Ambient Temperature TARange K –40 to 125 °C

Junction Temperature TJ(max) 165 °C

Storage Temperature Tstg –65 to 170 °C

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

THERMAL CHARACTERISTICS

Characteristic Symbol Test Conditions [1] Value Units

Package Thermal Resistance

(Junction to Ambient) RθJA

Mounted on the Allegro 85-xxxx evaluation board with

1500 mm2 of 2 oz. copper on each side, connected to pins

1 and 2, and to pins 3 and 4, with thermal vias connecting

the layers. Performance values include the power

consumed by the PCB. [2]

23 °C/W

Package Thermal Resistance

(Junction to Lead) RθJL Mounted on the Allegro ASEK730 evaluation board. 5 °C/W

[1] Additional thermal information available on the Allegro website.

[2] Further details on the board are available from the Frequently Asked Questions document on our website. Further information about board design and thermal perfor-

mance also can be found in the Applications Information section of this datasheet.

Terminal List Table

Number Name Description

1, 2 IP+ Terminals for current being sensed; fused internally

3, 4 IP– Terminals for current being sensed; fused internally

5 GND Signal ground terminal

6 VZCR Zero current reference; outputs a DC voltage equal to

VIOUT at IP = 0 A

7 VIOUT Analog output signal

8 VCC Device power supply terminal

Package LC, 8-Pin SOICN

Pinout Diagram

IP+

IP–

VCC

VIOUT

VZCR

GND

Pinout Diagram and Terminal List Table

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

VCC

VZCR

VIOUT

GND

IP+

IP–

To All Subcircuits

Temp

Sensor

Programming

Control

EEPROM and Control Logic

Bandgap

Reference

Hall

Voltage

Regulator

Fine

Sensitivity

Control

Coarse

Sensitivity

Control

Offset Control

and VZCR

Generation

POR

Functional Block Diagram

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

Characteristic Symbol Test Conditions Min. Typ. Max. Unit

Supply Voltage VCC 4.5 5 5.5 V

Supply Current ICC VCC = 5 V, output open – 17 25 mA

Power-On Time tPO TA = 25°C – 150 – μs

Output Capacitance Load CLVIOUT to GND – – 0.47 nF

Reference Capacitance Load CVZCR VZCR to GND – – 1 nF

Output Resistive Load RLVIOUT to GND, VIOUT to VCC 10 – – kΩ

Reference Resistive Load RVZCR VIOUT to GND, VZCR to VCC 10 – – kΩ

Output High Saturation Voltage [2] VOH VIOUT, TA = 25°C VCC – 0.4 VCC – 0.3 – V

Output Low Saturation Voltage [2] VOL VIOUT, TA = 25°C – 0.1 0.2 V

Primary Conductor Resistance RIP TA = 25°C – 1.2 – mΩ

Magnetic Coupling Factor MCF TA = 25°C – 10 – G/A

Rise Time trTA = 25°C, CL = 0.47 nF, 1 V step on output – 0.6 – μs

Propagation Delay tpd TA = 25°C, CL = 0.47 nF, 1 V step on output – 0.2 – µs

Response Time tRESPONSE TA = 25°C, CL = 0.47 nF, 1 V step on output – 0.7 – μs

Internal Bandwidth BW Small signal –3 dB; CL = 0.47 nF – 1 – MHz

Noise Density IND

Input-referenced noise density;

TA = 25°C, CL = 0.47 nF – 40 – µA /

√(Hz)

Noise IN

Input-referenced noise;

TA = 25°C, CL = 0.47 nF – 40 – mARMS

Power Supply Rejection Ratio PSRR 0 to 200 Hz, 100 mV pk-pk ripple on VCC,

IP = 0 A, VIOUT and VZCR – 35 – dB

Sensitivity Power Supply Rejection Ratio SPSRR DC, VCC(min) < VCC < VCC(max),

IP = IPR(max) – 15 – dB

Offset Power Supply Rejection Ratio OPSRR DC, VCC(min) < VCC < VCC(max) – 30 – dB

Output Source Current IOUT(src) VIOUT shorted to GND – 5.5 – mA

Output Sink Current IOUT(snk) VIOUT shorted to VCC – 3 – mA

Zero Current Reference Voltage VZCR TA = 25°C – 2.5 – V

Zero Current Reference Offset Voltage VZCR(ofs)

TA = 25°C –10 ±3 10 mV

TA = 25°C to 125°C –20 ±10 20 mV

TA = –40°C to 25°C – ±10 – mV

Reference Source Current IVZCR(src) VZCR shorted to GND – 2 – mA

Reference Sink Current IVZCR(snk) VZCR shored to VCC – 14 – mA

[1] Device may be operated at higher primary current levels, IP , ambient temperatures, TA , and internal leadframe temperatures, provided the Maximum Junction Tempera-

ture, TJ(max), is not exceeded.

[2] The sensor IC will continue to respond to current beyond the range of IP until the high or low saturation voltage; however, the nonlinearity in this region will be worse than

through the rest of the measurement range.

COMMON ELECTRICAL CHARACTERISTICS [1]: Valid over full range of TA , VCC

= 5 V, unless otherwise specied

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

xKLCTR-20AB PERFORMANCE CHARACTERISTICS: Valid over full range of TA, VCC

= 5 V, CBYPASS = 0.1 µF, unless otherwise specied

Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit

NOMINAL PERFORMANCE

Current Sensing Range IPR –20 – 20 A

Sensitivity Sens – 100 – mV/A

Zero Current Output Voltage VIOUT(Q) IP = 0 A, TA = 25°C – 2.5 – V

ACCURACY PERFORMANCE

Total Output Error [2] ETOT

IP = IP(MAX); TA = 25°C to 125°C –4 ±3 4 %

IP = IP(MAX); TA = –40°C to 25°C – ±4 – %

Sensitivity Error Esens

IP = IP(MAX); TA = 25°C to 125°C –2.5 ±1.5 2.5 %

IP = IP(MAX); TA = –40°C to 25°C – ±4 – %

Offset Voltage VOE

IP = 0 A; TA = 25°C to 125°C –75 ±50 75 mV

IP = 0 A; TA = –40°C to 25°C – ±50 – mV

Nonlinearity ELIN

Through the full range of IP; TA = 25°C to 125°C –2 ±0.75 2 %

Through the full range of IP; TA = –40°C to 25°C – ±0.75 – %

LIFETIME DRIFT CHARACTERISTICS

Total Output Error Including Lifetime Drift Etot_drift IP = 20 A – ±6.7 – %

Sensitivity Error Including Lifetime Drift Esens_drift IP = 20 A – ±3.8 – %

Offset Voltage Including Lifetime Drift Voff_drift IP = 0 A – ±118 – mV

[1] Typical values with ± are 3 sigma values.

[2] Percentage of IP

xKLCTR-30AB PERFORMANCE CHARACTERISTICS: Valid over full range of TA, VCC

= 5 V, CBYPASS = 0.1 µF, unless otherwise specied

Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit

NOMINAL PERFORMANCE

Current Sensing Range IPR –30 – 30 A

Sensitivity Sens – 66 – mV/A

Zero Current Output Voltage VIOUT(Q) IP = 0 A, TA = 25°C – 2.5 – V

ACCURACY PERFORMANCE

Total Output Error [2] ETOT

IP = IP(MAX); TA = 25°C to 125°C –5 ±3 5 %

IP = IP(MAX); TA = –40°C to 25°C – ±5 – %

Sensitivity Error Esens

IP = IP(MAX); TA = 25°C to 125°C –3.5 ±2.5 3.5 %

IP = IP(MAX); TA = –40°C to 25°C – ±5 – %

Offset Voltage VOE

IP = 0 A; TA = 25°C to 125°C –40 ±20 40 mV

IP = 0 A; TA = –40°C to 25°C – ±30 – mV

Nonlinearity ELIN

Through the full range of IP; TA = 25°C to 125°C –2 ±0.75 2 %

Through the full range of IP; TA = –40°C to 25°C – ±0.75 – %

LIFETIME DRIFT CHARACTERISTICS

Total Output Error Including Lifetime Drift Etot_drift IP = 40 A – ±6.7 – %

Sensitivity Error Including Lifetime Drift Esens_drift IP = 20 A – ±3.8 – %

Offset Voltage Including Lifetime Drift Voff_drift IP = 0 A – ±118 – mV

[1] Typical values with ± are 3 sigma values.

[2] Percentage of IP

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

xKLCTR-40AB PERFORMANCE CHARACTERISTICS: Valid over full range of TA, VCC

= 5 V, CBYPASS = 0.1 µF, unless otherwise specied

Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit

NOMINAL PERFORMANCE

Current Sensing Range IPR –40 – 40 A

Sensitivity Sens – 50 – mV/A

Zero Current Output Voltage VIOUT(Q) IP = 0 A, TA = 25°C – 2.5 – V

ACCURACY PERFORMANCE

Total Output Error [2] ETOT

IP = IP(MAX); TA = 25°C to 125°C –5 ±3 5 %

IP = IP(MAX); TA = –40°C to 25°C – ±5 – %

Sensitivity Error Esens

IP = IP(MAX); TA = 25°C to 125°C –3.5 ±2.5 3.5 %

IP = IP(MAX); TA = –40°C to 25°C – ±5 – %

Offset Voltage VOE

IP = 0 A; TA = 25°C to 125°C –40 ±20 40 mV

IP = 0 A; TA = –40°C to 25°C – ±30 – mV

Nonlinearity ELIN

Through the full range of IP; TA = 25°C to 125°C –2 ±0.75 2 %

Through the full range of IP; TA = –40°C to 25°C – ±0.75 – %

LIFETIME DRIFT CHARACTERISTICS

Total Output Error Including Lifetime Drift Etot_drift IP = 40 A – ±6.7 – %

Sensitivity Error Including Lifetime Drift Esens_drift IP = 20 A – ±3.8 – %

Offset Voltage Including Lifetime Drift Voff_drift IP = 0 A – ±118 – mV

[1] Typical values with ± are 3 sigma values.

[2] Percentage of IP

xKLCTR-30AU PERFORMANCE CHARACTERISTICS: Valid over full range of TA, VCC

= 5 V, CBYPASS = 0.1 µF, unless otherwise specied

Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit

NOMINAL PERFORMANCE

Current Sensing Range IPR 0 – 30 A

Sensitivity Sens – 120 – mV/A

Zero Current Output Voltage VIOUT(Q) IP = 0 A, TA = 25°C – 0.5 – V

ACCURACY PERFORMANCE

Total Output Error [2] ETOT

IP = IP(MAX); TA = 25°C to 125°C –5 ±2.6 5 %

IP = IP(MAX); TA = –40°C to 25°C – ±3.7 – %

Sensitivity Error Esens

IP = IP(MAX); TA = 25°C to 125°C –3.5 ±1.2 3.5 %

IP = IP(MAX); TA = –40°C to 25°C – ±3.7 – %

Offset Voltage VOE

IP = 0 A; TA = 25°C to 125°C –40 ±35 40 mV

IP = 0 A; TA = –40°C to 25°C – ±38 – mV

Nonlinearity ELIN

Through the full range of IP; TA = 25°C to 125°C –2 ±1 2 %

Through the full range of IP; TA = –40°C to 25°C – ±2.3 – %

LIFETIME DRIFT CHARACTERISTICS

Total Output Error Including Lifetime Drift Etot_drift IP = 40 A – ±6.7 – %

Sensitivity Error Including Lifetime Drift Esens_drift IP = 20 A – ±3.8 – %

Offset Voltage Including Lifetime Drift Voff_drift IP = 0 A – ±118 – mV

[1] Typical values with ± are 3 sigma values.

[2] Percentage of IP

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

xKLCTR-50AB PERFORMANCE CHARACTERISTICS: Valid over full range of TA, VCC

= 5 V, CBYPASS = 0.1 µF, unless otherwise specied

Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit

NOMINAL PERFORMANCE

Current Sensing Range IPR –50 – 50 A

Sensitivity Sens – 40 – mV/A

Zero Current Output Voltage VIOUT(Q) IP = 0 A, TA = 25°C – 2.5 – V

ACCURACY PERFORMANCE

Total Output Error [2] ETOT

IP = IP(MAX); TA = 25°C to 125°C –5 ±3 5 %

IP = IP(MAX); TA = –40°C to 25°C – ±5 – %

Sensitivity Error Esens

IP = IP(MAX); TA = 25°C to 125°C –3.5 ±3 3.5 %

IP = IP(MAX); TA = –40°C to 25°C – ±5 – %

Offset Voltage VOE

IP = 0 A; TA = 25°C to 125°C –40 ±20 40 mV

IP = 0 A; TA = –40°C to 25°C – ±30 – mV

Nonlinearity ELIN

Through the full range of IP; TA = 25°C to 125°C –2 ±0.75 2 %

Through the full range of IP; TA = –40°C to 25°C – ±0.75 – %

LIFETIME DRIFT CHARACTERISTICS

Total Output Error Including Lifetime Drift Etot_drift IP = 50 A – ±6.7 – %

Sensitivity Error Including Lifetime Drift Esens_drift IP = 25 A – ±3.8 – %

Offset Voltage Including Lifetime Drift Voff_drift IP = 0 A – ±118 – mV

[1] Typical values with ± are 3 sigma values.

[2] Percentage of IP

xKLCTR-40AU PERFORMANCE CHARACTERISTICS: Valid over full range of TA, VCC

= 5 V, CBYPASS = 0.1 µF, unless otherwise specied

Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit

NOMINAL PERFORMANCE

Current Sensing Range IPR 0 – 40 A

Sensitivity Sens – 100 – mV/A

Zero Current Output Voltage VIOUT(Q) IP = 0 A, TA = 25°C – 0.5 – V

ACCURACY PERFORMANCE

Total Output Error [2] ETOT

IP = IP(MAX); TA = 25°C to 125°C –5 ±2.6 5 %

IP = IP(MAX); TA = –40°C to 25°C – ±3.7 – %

Sensitivity Error Esens

IP = IP(MAX); TA = 25°C to 125°C –3.5 ±1.2 3.5 %

IP = IP(MAX); TA = –40°C to 25°C – ±3.7 – %

Offset Voltage VOE

IP = 0 A; TA = 25°C to 125°C –40 ±35 40 mV

IP = 0 A; TA = –40°C to 25°C – ±38 – mV

Nonlinearity ELIN

Through the full range of IP; TA = 25°C to 125°C –2 ±1 2 %

Through the full range of IP; TA = –40°C to 25°C – ±2.3 – %

LIFETIME DRIFT CHARACTERISTICS

Total Output Error Including Lifetime Drift Etot_drift IP = 40 A – ±6.7 – %

Sensitivity Error Including Lifetime Drift Esens_drift IP = 20 A – ±3.8 – %

Offset Voltage Including Lifetime Drift Voff_drift IP = 0 A – ±118 – mV

[1] Typical values with ± are 3 sigma values.

[2] Percentage of IP

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

xKLCTR-80AU PERFORMANCE CHARACTERISTICS: Valid over full range of TA, VCC

= 5 V, CBYPASS = 0.1 µF, unless otherwise specied

Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit

NOMINAL PERFORMANCE

Current Sensing Range IPR 0 – 80 A

Sensitivity Sens – 50 – mV/A

Zero Current Output Voltage VIOUT(Q) IP = 0 A, TA = 25°C – 0.5 – V

ACCURACY PERFORMANCE

Total Output Error [2] ETOT

IP = IP(MAX); TA = 25°C to 125°C –5 ±1.8 5 %

IP = IP(MAX); TA = –40°C to 25°C – ±5 – %

Sensitivity Error Esens

IP = IP(MAX); TA = 25°C to 125°C –3.5 ±1.5 3.5 %

IP = IP(MAX); TA = –40°C to 25°C – ±4.2 – %

Offset Voltage VOE

IP = 0 A; TA = 25°C to 125°C –40 ±21 40 mV

IP = 0 A; TA = –40°C to 25°C – ±27 – mV

Nonlinearity ELIN

Through the full range of IP; TA = 25°C to 125°C –2 ±0.3 2 %

Through the full range of IP; TA = –40°C to 25°C – ±2.3 – %

LIFETIME DRIFT CHARACTERISTICS

Total Output Error Including Lifetime Drift Etot_drift IP = 80 A – ±6.7 – %

Sensitivity Error Including Lifetime Drift Esens_drift IP = 40 A – ±3.8 – %

Offset Voltage Including Lifetime Drift Voff_drift IP = 0 A – ±118 – mV

[1] Typical values with ± are 3 sigma values.

[2] Percentage of IP

xKLCTR-65AB PERFORMANCE CHARACTERISTICS: Valid over full range of TA, VCC

= 5 V, CBYPASS = 0.1 µF, unless otherwise specied

Characteristic Symbol Test Conditions Min. Typ. [1] Max. Unit

NOMINAL PERFORMANCE

Current Sensing Range IPR –65 – 65 A

Sensitivity Sens – 30 – mV/A

Zero Current Output Voltage VIOUT(Q) IP = 0 A, TA = 25°C – 2.5 – V

ACCURACY PERFORMANCE

Total Output Error [2] ETOT

IP = IP(MAX); TA = 25°C to 125°C –5 ±3 5 %

IP = IP(MAX); TA = –40°C to 25°C – ±5 – %

Sensitivity Error Esens

IP = IP(MAX); TA = 25°C to 125°C –3.5 ±3 3.5 %

IP = IP(MAX); TA = –40°C to 25°C – ±5 – %

Offset Voltage VOE

IP = 0 A; TA = 25°C to 125°C –40 ±20 40 mV

IP = 0 A; TA = –40°C to 25°C – ±30 – mV

Nonlinearity ELIN

Through the full range of IP; TA = 25°C to 125°C –2 ±0.75 2 %

Through the full range of IP; TA = –40°C to 25°C – ±0.75 – %

LIFETIME DRIFT CHARACTERISTICS

Total Output Error Including Lifetime Drift Etot_drift IP = 65 A – ±6.7 – %

Sensitivity Error Including Lifetime Drift Esens_drift IP = 32 A – ±3.8 – %

Offset Voltage Including Lifetime Drift Voff_drift IP = 0 A – ±118 – mV

[1] Typical values with ± are 3 sigma values.

[2] Percentage of IP

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

CHARACTERISTIC PERFORMANCE

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

Response Time (tRESPONSE)

10 A input signal (IP) with rise time < 1 µs

Sensitivity = 100 mV/A, CBYPASS = 0.1 µF, CL = 470 pF, VZCR = 1 nF

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

Propagation Delay (tpd)

10 A input signal (IP) with rise time < 1 µs

Sensitivity = 100 mV/A, CBYPASS = 0.1 µF, CL = 470 pF, VZCR = 1 nF

tpd = 217 ns

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

Rise Time (tr)

10 A input signal (IP) with rise time < 1 µs

Sensitivity = 100 mV/A, CBYPASS = 0.1 µF, CL = 470 pF, VZCR = 1 nF

tr = 791 ns

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

CHARACTERISTIC PERFORMANCE

xKLCTR-20AB Key Parameters

+3 Sigma -3 Sigma

Average

-60

-40

-20

-50 0 50 100 150

Oﬀset Voltage (mV)

Temperature (°C)

Zero Current Output Voltage Error vs. Temperature

-2.0

-1.5

-1.0

-0.5

0.0

0.5

1.0

1.5

2.0

-50 0 50 100 150

Nonlinearity (%)

Temperature (°C)

Nonlinearity vs. Temperature

-6.0

-5.0

-4.0

-3.0

-2.0

-1.0

0.0

1.0

2.0

3.0

-50 0 50 100 150

Total Error (%)

Temperature (°C)

Total Error at IPR(max) vs. Temperature

-10

-5

-50 0 50 100 150

Oﬀset Voltage (mV)

Temperature (°C)

Zero Current Reference Voltage Error vs. Temperature

-5.0

-4.0

-3.0

-2.0

-1.0

0.0

1.0

-50 0 50 100 150

Sensivity Error (%)

Temperature (°C)

Sensivity Error Half Scale vs. Temperature

-5.0

-4.0

-3.0

-2.0

-1.0

0.0

1.0

-50 0 50 100 150

Sensivity Error (%)

Temperature (°C)

Sensivity Error Full Scale vs. Temperature

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

xKLCTR-30AB Key Parameters

+3 Sigma -3 Sigma

Average

-2

-1

-50 050 100 150

Sensitivity Error (%)

Temperature (°C)

Sensitivity Error Half Scale vs. Temperature

-0.5

-0.25

0.25

0.5

0.75

1.25

1.5

-50 050 100 150

Nonlinearity (%)

Temperature (°C)

Nonlinearity vs. Temperature

-6

-4

-2

-50 050 100 150

Total Error (%)

Temperature (°C)

Total Error at IPR(max) vs. Temperature

-40.00

-30.00

-20.00

-10.00

0.00

10.00

20.00

30.00

40.00

-50 050 100 150

Offset Voltage (mV)

Temperature (°C)

Zero Current Output Voltage Error vs. Temperature

-3

-2

-1

-50 050 100 150

Sensitivity Error (%)

Temperature (°C)

Sensitivity Error Full Scale vs. Temperature

-15

-10

-5

-50 050 100 150

Offset Voltage (mV)

Temperature (°C)

Zero Current Reference Voltage Error vs. Temperature

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

-4

-3

-2

-1

-50 050 100 150

Sensitivity Error (%)

Temperature (°C)

Sensitivity Error Half Scale vs. Temperature

-1

-0.75

-0.5

-0.25

0.25

0.5

0.75

1.25

1.5

1.75

-50 050 100 150

Nonlinearity (%)

Temperature (°C)

Nonlinearity vs. Temperature

-6

-4

-2

-50 050 100 150

Total Error (%)

Temperature (°C)

Total Error at IPR(max) vs. Temperature

-40.00

-30.00

-20.00

-10.00

0.00

10.00

20.00

30.00

40.00

50.00

-50 050 100 150

Offset Voltage (mV)

Temperature (°C)

Zero Current Output Voltage Error vs. Temperature

-4

-3

-2

-1

-50 050 100 150

Sensitivity Error (%)

Temperature (°C)

Sensitivity Error Full Scale vs. Temperature

-10

-8

-6

-4

-2

-50 050 100 150

Offset Voltage (mV)

Temperature (°C)

Zero Current Reference Voltage Error vs. Temperature

xKLCTR-30AU Key Parameters

+3 Sigma -3 Sigma

Average

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

xKLCTR-40AB Key Parameters

+3 Sigma -3 Sigma

Average

-30

-20

-10

-50 0 50 100 150

Oﬀset Voltage (mV)

Temperature (°C)

Zero Current Output Voltage Error vs. Temperature

-10

-8

-6

-4

-2

-50 0 50 100 150

Oﬀset Voltage (mV)

Temperature (°C)

Zero Current Reference Voltage Error vs. Temperature

-3.5

-3.0

-2.5

-2.0

-1.5

-1.0

-0.5

0.0

0.5

1.0

1.5

-50 0 50 100 15

Sensivity Error (%)

Temperature (°C)

Sensivity Error Half Scale vs. Temperature

-6.0

-5.0

-4.0

-3.0

-2.0

-1.0

0.0

1.0

2.0

-50 0 50 100 150

Sensivity Error (%)

Temperature (°C)

Sensivity Error Full Scale vs. Temperature

-1.0

-0.5

0.0

0.5

1.0

1.5

2.0

2.5

3.0

-50 0 50 100 150

Nonlinearity (%)

Temperature (°C)

Nonlinearity vs. Temperature

-6.0

-5.0

-4.0

-3.0

-2.0

-1.0

0.0

1.0

2.0

3.0

-50 0 50 100 150

Total Error (%)

Temperature (°C)

Total Error at IPR(max) vs. Temperature

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

xKLCTR-50AB Key Parameters

+3 Sigma -3 Sigma

Average

-30

-20

-10

-50 0 50 100 150

Oﬀset Voltage (mV)

Temperature (°C)

Zero Current Output Voltage Error vs. Temperature

-8

-6

-4

-2

-50 0 50 100 150

Oﬀset Voltage (mV)

Temperature (°C)

Zero Current Reference Voltage Error vs. Temperature

-2.5

-2.0

-1.5

-1.0

-0.5

0.0

0.5

1.0

1.5

2.0

-50 0 50 100 150

Sensivity Error (%)

Temperature (°C)

Sensivity Error Half Scale vs. Temperature

-6.0

-5.0

-4.0

-3.0

-2.0

-1.0

0.0

1.0

2.0

-50 0 50 100 150

Sensivity Error (%)

Temperature (°C)

Sensivity Error Full Scale vs. Temperature

-1.0

0.0

1.0

2.0

3.0

4.0

5.0

-50 0 50 100 150

Nonlinearity (%)

Temperature (°C)

Nonlinearity vs. Temperature

-6.0

-5.0

-4.0

-3.0

-2.0

-1.0

0.0

1.0

2.0

-50 0 50 100 150

Total Error (%)

Temperature (°C)

Total Error at IPR(max) vs. Temperature

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

xKLCTR-65AB Key Parameters

+3 Sigma -3 Sigma

Average

-4

-3

-2

-1

-50 050 100 150

Sensitivity

Error

(%)

Temperature (°C)

Sensitivity Error Half Scale vs. Temperature

-1

-0.5

0.5

1.5

2.5

3.5

-50 050 100 150

Nonlinearity (%)

Temperature (°C)

Nonlinearity vs. Temperature

-6

-4

-2

-50 050 100 150

Total Error (%)

Temperature (°C)

Total Error at I

PR(max)

vs. Temperature

-40.00

-30.00

-20.00

-10.00

0.00

10.00

20.00

30.00

40.00

50.00

-50 050 100 150

Offset Voltage (mV)

Temperature (°C)

Zero Current Output Voltage Error vs. Temperature

-7

-6

-5

-4

-3

-2

-1

-50 050 100 150

Sensitivity Error (%)

Temperature (°C)

Sensitivity Error Full Scale vs. Temperature

-10

-8

-6

-4

-2

-50 050 100 150

Offset Voltage (mV)

Temperature (°C)

Zero Current Reference Voltage Error vs. Temperature

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

Sensitivity (Sens). The change in sensor IC output in response to

a 1 A change through the primary conductor. The sensitivity is the

product of the magnetic circuit sensitivity (G / A) (1 G = 0.1 mT)

and the linear IC amplifier gain (mV/G). The linear IC ampli-

fier gain is programmed at the factory to optimize the sensitivity

(mV/A) for the full-scale current of the device.

Nonlinearity (ELIN). The nonlinearity is a measure of how linear

the output of the sensor IC is over the full current measurement

range. The nonlinearity is calculated as:

ELIN =

VIOUT (IR(max)) – VIOUT(Q)

2 • VIOUT (IR(max)/2) – VIOUT(Q)

• 100(%)

{

}

1 –

Zero Current Output Voltage (VIOUT(Q)). The output of the

sensor when the primary current is zero. For a unipolar supply

voltage, it nominally remains at 2.5 V for a bidirectional device.

Variation in VIOUT(Q) can be attributed to the resolution of the

Allegro linear IC quiescent voltage trim and thermal drift.

Offset Voltage (VOE). The deviation of the device output from

its ideal quiescent value of 2.5 V due to nonmagnetic causes. To

convert this voltage to amperes, divide by the device sensitivity,

Sens.

Total Output Error (ETOT). The difference between the cur-

rent measurement from the sensor IC and the actual current (IP),

relative to the actual current. This is equivalent to the difference

between the ideal output voltage and the actual output voltage,

divided by the ideal sensitivity, relative to the current flowing

through the primary conduction path:

ETOT (IP) = VIOUT_IDEAL(IP) – VIOUT(IP)

SensIDEAL × IP

• 100 (%)

The Total Output Error incorporates all sources of error and is a

function of IP . At relatively high currents, ETOT will be mostly

due to sensitivity error, and at relatively low currents, ETOT will

be mostly due to Offset Voltage (VOE

). In fact, at IP = 0, ETOT

approaches infinity due to the offset. This is illustrated in Figure

1 and Figure 2. Figure 1 shows a distribution of output voltages

versus IP at 25°C and across temperature. Figure 2 shows the cor-

responding ETOT versus IP .

DEFINITIONS OF ACCURACY CHARACTERISTICS

Figure 1: Output Voltage versus Sensed Current

Figure 2: Total Output Error versus Sensed Current

0 A

Decreasing

IOUT

(V)

Accuracy Across

Temperature

Accuracy Across

Temperature

Accuracy Across

Temperature

Accuracy at

25°C Only

Accuracy at

25°C Only

Accuracy at

25°C Only

Increasing

IOUT

(V)

Ideal V

IOUT

(min)

(max)

(A)

–I

(A)

IOUT(Q)

Full Scale I

+IP

–IP

+ETOT

–ETOT

Across Temperature

25°C Only

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

Power Supply Rejection Ratio (PSRR). The ratio of the change

on VIOUT or VZCR to a change in VCC in dB.

PSRR = 20 log

ΔV

IOUT

(| |)

Sensitivity Power Supply Rejection Ratio (PSRR). The ratio of

the percent change in sensitivity from the sensitivity at 5 V to the

percent change in VCC in dB.

SPSRR (VCC) = 20 log10

SensVCCN × (VCC – 5 V)

(| |)

[SensVCC – Sens5V] × 5 V

An SPSRR value of 15 dB means that a ten percent change in

VCC (going from 5 to 5.5 V, for example) results in around a

1.75 percent change in sensitivity.

Offset Power Supply Rejection Ratio (OPSRR). The ratio of

the change in offset to a change in VCC in dB.

OPSRR = 20 log10

ΔV

ΔVOE

(| |)

An OPSRR value of 30 dB means that a 500 mV change in VCC

(going from 5 to 5.5 V, for example) results in around 15 mV of

change in the offset.

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

APPLICATION INFORMATION

Impact of External Magnetic Fields

The ACS730 works by sensing the magnetic field created by the

current flowing through the package. However, the sensor cannot

differentiate between fields created by the current flow and exter-

nal magnetic fields. This means that external magnetic fields can

cause errors in the output of the sensor. Magnetic fields which are

perpendicular to the surface of the package affect the output of

the sensor, as it only senses fields in that one plane. The error in

Amperes can be quantified as:

Error (B) =

MCF

where B is the strength of the external field perpendicular to the

surface of the package in gauss (G), and MCF is the magnetic

coupling factor in gauss/amperes (G/A). Then, multiplying by

the sensitivity of the part (Sens) gives the error in mV seen at the

output.

For example, an external field of 1 gauss will result in around

0.1 A of error. If the ACS730KLCTR-20AB, which has a nominal

sensitivity of 100 mV/A, is being used, that equates to 10 mV of

error on the output of the sensor.

External Field

(Gauss)

Error

(A)

Error (mV)

20B 40B 50B

0.5 0.05 5 2.5 2

1 0.1 10 5 4

2 0.2 20 10 8

Estimating Total Error vs. Sensed Current

The Performance Characteristics tables give distribution values

(±3 sigma) for Total Error at IP(max) and IP(half); however, one

often wants to know what error to expect at a particular current.

This can be estimated by using the distribution data for the com-

ponents of Total Error, Sensitivity Error, and Offset Voltage. The

±3 sigma value for Total Error (ETOT) as a function of the sensed

current (IP) is estimated as:

E(I) =

TOTP

E+

SENS

100 × V

Sens × I

()

Here, ESENS and VOE are the ±3 sigma values for those error

terms. If there is an average offset voltage, then the average Total

Error is estimated as:

E(I) = E+

TOTP SENS

100 × V

Sens × I

AVGAVG

AVG

The resulting total error will be a sum of ETOT and ETOT_AVG.

Using these equations and the 3 sigma distributions for Sensitiv-

ity Error and Offset Voltage, the Total Error versus sensed current

(IP) is below for the ACS730KLCTR-20AB. As expected, as the

sensed current (IP) approaches zero, the error in percent goes

towards infinity due to division by zero (refer to Figure 3).

-40ºC + 3σ

-40ºC–3σ

25ºC + 3σ

25ºC–3σ

125ºC + 3σ

125ºC–3σ

-20.00

-15.00

-10.00

-5.00

0.00

5.00

10.00

15.00

20.00

02468101214161820

Total Error (% of current measured)

Current (A)

Figure 3: Predicted Total Error as a Function of the Sensed Current for the ACS730KLCTR-20AB

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

DEFINITIONS OF DYNAMIC RESPONSE CHARACTERISTICS

Power-On Time (tPO). When the supply is ramped to its operat-

ing voltage, the device requires a finite time to power its internal

components before responding to an input magnetic field.

Power-On Time, tPO , is defined as the time it takes for the output

voltage to settle within ±10% of its steady-state value under an

applied magnetic field, after the power supply has reached its

minimum specified operating voltage, VCC(min), as shown in the

chart at right.

Rise Time (tr). The time interval between a) when the sensor

reaches 10% of its full-scale value, and b) when it reaches 90% of

its full scale value.

Response Time (tRESPONSE). The time interval between a) when

the sensed input current reaches 90% of its final value, and b)

when the sensor output reaches 90% of its full-scale value.

Propagation Delay (tpd

). The time interval between a) when the

sensed input current reaches 20% of its full-scale value, and b)

when the sensor output reaches 20% of its full-scale value.

VIOUT

VCC

VCC(min.)

90% VIOUT

t1= time at which power supply reaches

minimum specified operating voltage

t2=

time at which output voltage settles

within ±10% of its steady state value

under an applied magnetic field

t1t2

tPO

(typ.)

Primary Current

VIOUT

(%)

Response Time, tRESPONSE

Primary Current

VIOUT

(%)

Propagation Delay, tpd

Rise Time, tr

Figure 3: Power-On Time (tPO)

Figure 4: Rise Time (tr) and Propagation Delay (tpd)

Figure 5: Response Time (tRESPONSE)

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

Figure 6: Package LC, 8-Pin SOICN

For Reference Only – Not for Tooling Use

(Reference MS-012AA)

Dimensions in millimeters – NOT TO SCALE

Dimensions exclusive of mold ﬂash, gate burrs, and dambar protrusions

Exact case and lead conﬁguration at supplier discretion within limits shown

SEATING

PLANE

1.27 BSC

Branding scale and appearance at supplier discretion

C0.10

0.25 BSC

1.04 REF

1.75 MAX

4.90 ±0.10

3.90 ±0.10 6.00 ±0.20

0.51

0.31 0.25

0.10

0.25

0.17

1.27

0.40

8°

0°

Standard Branding Reference View

0.65 1.27

5.60

1.75

Branded Face SEATING PLANE

GAUGE PLANE

Terminal #1 mark area

Reference land pattern layout (reference IPC7351 SOIC127P600X175-8M);

all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary

to meet application process requirements and PCB layout tolerances.

PCB Layout Reference View

N = Device part number

P= Package Designator

T= Device temperature range

A=Amperage

L= Lot number

Belly Brand = Country of Origin

NNNNNNN

PPT-AAA

LLLLL

PACKAGE OUTLING DRAWING

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

For the latest version of this document, visit our website:

www.allegromicro.com

Revision History

Number Date Description

– February 29, 2016 Initial release

1 August 19, 2016 Updated Isolation Characteristics table and added Frequency Response charts

2 February 28, 2017 Updated Absolute Maximum Ratings table

3 August 29, 2017 Added “-40AU” and “-80AU” product options; updated Isolation Characteristics table.

4 April 30, 2018 Added “-30AB” product option

5 May 22, 2018 Added “-30AU” product option; updated “-40AU” and “-80AU” performance characteristics;

added certificate marks

6 July 30, 2018 Added Propagation Delay characteristic (page 5)

7 October 16, 2018 Added “-65AB” product option; updated “-80AU” Lifetime Drift test conditions

8 December 13, 2018 Updated certificate number

Allegro MicroSystems, LLC reserves the right to make, from time to time, such departures from the detail specifications as may be required to

permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that

the information being relied upon is current.

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of

Allegro’s product can reasonably be expected to cause bodily harm.

The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no responsibility for its

use; nor for any infringement of patents or other rights of third parties which may result from its use.

Copies of this document are considered uncontrolled documents.