LM4125
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SNVS238A MAY 2004REVISED APRIL 2013
LM4125 Precision Micropower Low Dropout Voltage Reference
Check for Samples: LM4125
1FEATURES DESCRIPTION
The LM4125 is a precision low power low dropout
2 Small SOT23-5 Package bandgap voltage reference with up to 5 mA output
Low Dropout Voltage: 120 mV Typ @ 1 mA current source and sink capability.
High Output Voltage Accuracy: 0.2% This series reference operates with input voltages as
Source and Sink Current Output: ±5 mA low as 2V and up to 6V consuming 160 µA (Typ.)
Supply Current: 160 μA Typ. supply current. In power down mode, device current
drops to less than 2 μA.
Low Temperature Coefficient: 50 ppm/°C The LM4125 comes in two grades (A and Standard)
Fixed Output Voltages: 2.048, 2.5,and 4.096 and three voltage options for greater flexibility. The
Industrial Temperature Range: 40°C to +85°C best grade devices (A) have an initial accuracy of
(For Extended Temperature Range, 40°C to 0.2%, while the standard have an initial accuracy of
125°C, Contact TI) 0.5%, both with a tempco of 50ppm/°C ensured from
40°C to +125°C.
APPLICATIONS The very low dropout voltage, low supply current and
Portable, Battery Powered Equipment power-down capability of the LM4125 makes this
product an ideal choice for battery powered and
Instrumentation and Process Control portable applications.
Automotive & Industrial The device performance is ensured over the industrial
Test Equipment temperature range (40°C to +85°C), while certain
Data Acquisition Systems specs are ensured over the extended temperature
Precision Regulators range (40°C to +125°C). Please contact TI for full
specifications over the extended temperature range.
Battery Chargers The LM4125 is available in a standard 5-pin SOT-23
Base Stations package.
Communications
Medical Equipment
Connection Diagram
Figure 1. 5-Pin SOT-23 Surface Mount Package
See Package Number DBV
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
1Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Copyright © 2004–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
LM4125
SNVS238A MAY 2004REVISED APRIL 2013
www.ti.com
Absolute Maximum Ratings(1)(2)
Maximum Voltage on input or enable pins 0.3V to 8V
Output Short-Circuit Duration Indefinite
Power Dissipation (TA= 25°C)(3) DBV package θJA 280°C/W
Power Dissipation 350 mW
ESD Susceptibility(4) Human Body Model 2 kV
Machine Model 200V
Lead Temperature: Soldering, (10 sec.) +260°C
Vapor Phase (60 sec.) +215°C
Infrared (15 sec.) +220°C
(1) “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and test
conditions, see Electrical Characteristics. The ensured specifications apply only for the test conditions listed. Some performance
characteristics may degrade when the device is not operated under the listed test conditions.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3) Without PCB copper enhancements. The maximum power dissipation must be de-rated at elevated temperatures and is limited by TJMAX
(maximum junction temperature), θJ-A (junction to ambient thermal resistance) and TA(ambient temperature). The maximum power
dissipation at any temperature is: PDissMAX = (TJMAX TA)/θJ-A up to the value listed in the Absolute Maximum Ratings.
(4) The human body model is a 100 pF capacitor discharged through a 1.5 kresistor into each pin. The machine model is a 200 pF
capacitor discharged directly into each pin.
Operating Range(1)
Storage Temperature Range 65°C to +150°C
Ambient Temperature Range 40°C to +85°C
Junction Temperature Range 40°C to +125°C
(1) “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and test
conditions, see Electrical Characteristics. The ensured specifications apply only for the test conditions listed. Some performance
characteristics may degrade when the device is not operated under the listed test conditions.
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Electrical Characteristics LM4125-2.048V and 2.5V
Unless otherwise specified VIN = 3.3V, ILOAD = 0, COUT = 0.01µF, TA= Tj= 25°C. Limits with standard typeface are for Tj=
25°C, and limits in boldface type apply over the 40°C TA+85°C temperature range.
Min Typ Max
Symbol Parameter Conditions Units
(1) (2) (1)
Output Voltage Initial Accuracy
LM4125A-2.048 ±0.2 %
LM4125A-2.500
VOUT LM4125-2.048 ±0.5 %
LM4125-2.500
TCVOUT/°C Temperature Coefficient 40°C TA+125°C 14 50 ppm/°c
ΔVOUT/ΔVIN Line Regulation 3.3V VIN 6V 0.0007 0.008 %/V
0.01
0 mA ILOAD 1 mA 0.03 0.08
0.17
1 mA ILOAD 5 mA 0.01 0.04
ΔVOUT/ΔILOAD Load Regulation %/mA
0.1
1 mA ILOAD 0 mA 0.04 0.12
5 mA ILOAD 1 mA 0.01
ILOAD = 0 mA 45 65
100
ILOAD = +1 mA 120 150
VINVOUT Dropout Voltage(3) mV
200
ILOAD = +5 mA 180 210
300
VNOutput Noise Voltage(4) 0.1 Hz to 10 Hz 20 µVPP
10 Hz to 10 kHz 36 µVPP
ISSupply Current 160 257 µA
290
VIN = 3.3V, VOUT = 0 15
6 30
ISC Short Circuit Current mA
VIN = 6V, VOUT = 0 17
6 30
Hyst Thermal Hysteresis(5) 40°C TA125°C 0.5 mV/V
ΔVOUT Long Term Stability(6) 1000 hrs. @ 25°C 100 ppm
(1) Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation using Statistical
Quality Control (SQC) methods. The limits are used to calculate Outgoing Quality Level (AOQL).
(2) Typical numbers are at 25°C and represent the most likely parametric norm.
(3) Dropout voltage is the differential voltage between VOUT and VIN at which VOUT changes 1% from VOUT at VIN = 3.3V for 2.0V, 2.5V
and 5V for 4.1V. A parasitic diode exists between input and output pins; it will conduct if VOUT is pulled to a higher voltage than VIN.
(4) Output noise voltage is proportional to VOUT. VNfor other voltage option is calculated using (VN(1.8V)/1.8) * VOUT. VN(2.5V) =
(36µVPP/1.8) * 2.5 = 46µVPP.
(5) Thermal hysteresis is defined as the change in +25°C output voltage before and after exposing the device to temperature extremes.
(6) Long term stability is change in VREF at 25°C measured continuously during 1000 hrs.
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Electrical Characteristics LM4125-4.096V
Unless otherwise specified VIN = 5V, ILOAD = 0, COUT = 0.01µF, TA= Tj= 25°C. Limits with standard typeface are for Tj= 25°C,
and limits in boldface type apply over the 40°C TA+85°C temperature range.
Min Typ Max
Symbol Parameter Conditions Units
(1) (2) (1)
Output Voltage Initial
Accuracy ±0.2 %
VOUT LM4125A-4.096
LM4125-4.096 ±0.5 %
TCVOUT/°C Temperature Coefficient 40°C TA+125°C 14 50 ppm/°c
ΔVOUT/ΔVIN Line Regulation 5V VIN 6V 0.0007 0.008 %/V
0.01
0 mA ILOAD 1 mA 0.03 0.08
0.17
1 mA ILOAD 5 mA 0.01 0.04
ΔVOUT/ΔILOAD Load Regulation %/mA
0.1
1 mA ILOAD 0 mA 0.04 0.12
5 mA ILOAD 1 mA 0.01
ILOAD = 0 mA 45 65
100
ILOAD = +1 mA 120 150
VINVOUT Dropout Voltage(3) mV
200
ILOAD = +5 mA 180 210
300
VNOutput Noise Voltage(4) 0.1 Hz to 10 Hz 20 µVPP
10 Hz to 10 kHz 36 µVPP
ISSupply Current 160 257 µA
290
VOUT = 0 15
6 30
ISC Short Circuit Current mA
VIN = 6V, VOUT = 0 17
6 30
Hyst Thermal Hysteresis(5) 40°C TA125°C 0.5 mV/V
ΔVOUT Long Term Stability(6) 1000 hrs. @ 25°C 100 ppm
(1) Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation using Statistical
Quality Control (SQC) methods. The limits are used to calculate Outgoing Quality Level (AOQL).
(2) Typical numbers are at 25°C and represent the most likely parametric norm.
(3) Dropout voltage is the differential voltage between VOUT and VIN at which VOUT changes 1% from VOUT at VIN = 3.3V for 2.0V, 2.5V
and 5V for 4.1V. A parasitic diode exists between input and output pins; it will conduct if VOUT is pulled to a higher voltage than VIN.
(4) Output noise voltage is proportional to VOUT. VNfor other voltage option is calculated using (VN(1.8V)/1.8) * VOUT. VN(2.5V) =
(36µVPP/1.8) * 2.5 = 46µVPP.
(5) Thermal hysteresis is defined as the change in +25°C output voltage before and after exposing the device to temperature extremes.
(6) Long term stability is change in VREF at 25°C measured continuously during 1000 hrs.
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SNVS238A MAY 2004REVISED APRIL 2013
LM4125 Typical Operating Characteristics
Unless otherwise specified, VIN = 3.3V, VOUT = 2.5V, ILOAD = 0, COUT = 0.022µF and TA= 25°C.
Long Term Drift Typical Temperature Drift
Figure 2. Figure 3.
Short Circuit Current Dropout Voltage
vs vs
Temperature Output Error
Figure 4. Figure 5.
Dropout Voltage
vs
Load Current Load Regulation
Figure 6. Figure 7.
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LM4125 Typical Operating Characteristics (continued)
Unless otherwise specified, VIN = 3.3V, VOUT = 2.5V, ILOAD = 0, COUT = 0.022µF and TA= 25°C.
GND Pin Current at No Load
vs
GND Pin Current Temperature
Figure 8. Figure 9.
GND Pin Current
vs
Load 0.1Hz to 10Hz output Noise
Figure 10. Figure 11.
Output Impedance PSRR
vs vs
Frequency Frequency
Figure 12. Figure 13.
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SNVS238A MAY 2004REVISED APRIL 2013
LM4125 Typical Operating Characteristics (continued)
Unless otherwise specified, VIN = 3.3V, VOUT = 2.5V, ILOAD = 0, COUT = 0.022µF and TA= 25°C.
Start-Up Response Load Step Response
Figure 14. Figure 15.
Load Step Response Line Step Response
Figure 16. Figure 17.
Thermal Hysteresis
Figure 18.
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PIN FUNCTIONS
Output (Pin 5): Reference Output.
Input (Pin 4): Positive Supply.
Ground (Pin 2): Negative Supply or Ground Connection.
APPLICATION HINTS
The standard application circuit for the LM4125 is shown in Figure 19. It is designed to be stable with ceramic
output capacitors in the range of 0.022µF to 0.1µF. Note that 0.022µF is the minimum required output capacitor.
These capacitors typically have an ESR of about 0.1 to 0.5. Smaller ESR can be tolerated, however larger ESR
can not. The output capacitor can be increased to improve load transient response, up to about 1µF. However,
values above 0.047µF must be tantalum. With tantalum capacitors, in the F range, a small capacitor between
the output and the reference pin is required. This capacitor will typically be in the 50pF range. Care must be
taken when using output capacitors of 1µF or larger. These application must be thoroughly tested over
temperature, line and load.
An input capacitor is typically not required. However, a 0.1µF ceramic can be used to help prevent line transients
from entering the LM4125. Larger input capacitors should be tantalum or aluminum.
The typical thermal hysteresis specification is defined as the change in +25°C voltage measured after thermal
cycling. The device is thermal cycled to temperature -40°C and then measured at 25°C. Next the device is
thermal cycled to temperature +125°C and again measured at 25°C. The resulting VOUT delta shift between the
25°C measurements is thermal hysteresis. Thermal hysteresis is common in precision references and is induced
by thermal-mechanical package stress. Changes in environmental storage temperature, operating temperature
and board mounting temperature are all factors that can contribute to thermal hysteresis.
Figure 19. Standard Application Circuit
INPUT CAPACITOR
Noise on the power-supply input can effect the output noise, but can be reduced by using an optional bypass
capacitor between the input pin and the ground.
PRINTED CIRCUIT BOARD LAYOUT CONSIDERATION
The mechanical stress due to PC board mounting can cause the output voltage to shift from its initial value.
References in SOT packages are generally less prone to assembly stress than devices in Small Outline (SOIC)
package.
To reduce the stress-related output voltage shifts, mount the reference on the low flex areas of the PC board
such as near to the edge or the corner of the PC board.
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Typical Application Circuits
Figure 20. Voltage Reference with Negative Output Figure 21. Precision High Current Low Dropout
Regulator
Figure 22. Precision High Current Negative Voltage Figure 23. Voltage Reference with Complimentary
Regulator Output
Figure 24. Precision High Current Low Droput Figure 25. Precision Voltage Reference with Force
Regulator and Sense Output
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Figure 26. Programmable Current Source Figure 27. Precision Regulator with Current
Limiting Circuit
Figure 28. Power Supply Splitter
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SNVS238A MAY 2004REVISED APRIL 2013
REVISION HISTORY
Changes from Original (April 2013) to Revision A Page
Changed layout of National Data Sheet to TI format .......................................................................................................... 10
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PACKAGE OPTION ADDENDUM
www.ti.com 27-Oct-2016
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
LM4125AIM5-2.5/NOPB ACTIVE SOT-23 DBV 5 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 R81A
LM4125IM5-2.0/NOPB ACTIVE SOT-23 DBV 5 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 R80B
LM4125IM5-2.5/NOPB ACTIVE SOT-23 DBV 5 1000 Green (RoHS
& no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 R81B
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
PACKAGE OPTION ADDENDUM
www.ti.com 27-Oct-2016
Addendum-Page 2
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
LM4125AIM5-2.5/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM4125IM5-2.0/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LM4125IM5-2.5/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
PACKAGE MATERIALS INFORMATION
www.ti.com 20-Dec-2016
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
LM4125AIM5-2.5/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LM4125IM5-2.0/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LM4125IM5-2.5/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 20-Dec-2016
Pack Materials-Page 2
www.ti.com
PACKAGE OUTLINE
C
TYP
0.22
0.08
0.25
3.0
2.6
2X 0.95
1.9
1.45 MAX
TYP
0.15
0.00
5X 0.5
0.3
TYP
0.6
0.3
TYP
8
0
1.9
A
3.05
2.75
B
1.75
1.45
(1.1)
SOT-23 - 1.45 mm max heightDBV0005A
SMALL OUTLINE TRANSISTOR
4214839/C 04/2017
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. Refernce JEDEC MO-178.
0.2 C A B
1
34
5
2
INDEX AREA
PIN 1
GAGE PLANE
SEATING PLANE
0.1 C
SCALE 4.000
www.ti.com
EXAMPLE BOARD LAYOUT
0.07 MAX
ARROUND 0.07 MIN
ARROUND
5X (1.1)
5X (0.6)
(2.6)
(1.9)
2X (0.95)
(R0.05) TYP
4214839/C 04/2017
SOT-23 - 1.45 mm max heightDBV0005A
SMALL OUTLINE TRANSISTOR
NOTES: (continued)
4. Publication IPC-7351 may have alternate designs.
5. Solder mask tolerances between and around signal pads can vary based on board fabrication site.
SYMM
LAND PATTERN EXAMPLE
EXPOSED METAL SHOWN
SCALE:15X
PKG
1
34
5
2
SOLDER MASK
OPENING
METAL UNDER
SOLDER MASK
SOLDER MASK
DEFINED
EXPOSED METAL
METAL
SOLDER MASK
OPENING
NON SOLDER MASK
DEFINED
(PREFERRED)
SOLDER MASK DETAILS
EXPOSED METAL
www.ti.com
EXAMPLE STENCIL DESIGN
(2.6)
(1.9)
2X(0.95)
5X (1.1)
5X (0.6)
(R0.05) TYP
SOT-23 - 1.45 mm max heightDBV0005A
SMALL OUTLINE TRANSISTOR
4214839/C 04/2017
NOTES: (continued)
6. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
7. Board assembly site may have different recommendations for stencil design.
SOLDER PASTE EXAMPLE
BASED ON 0.125 mm THICK STENCIL
SCALE:15X
SYMM
PKG
1
34
5
2
www.ti.com
PACKAGE OUTLINE
C
TYP
0.22
0.08
0.25
3.0
2.6
2X 0.95
1.9
1.45 MAX
TYP
0.15
0.00
5X 0.5
0.3
TYP
0.6
0.3
TYP
8
0
1.9
A
3.05
2.75
B
1.75
1.45
(1.1)
SOT-23 - 1.45 mm max heightDBV0005A
SMALL OUTLINE TRANSISTOR
4214839/C 04/2017
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. Refernce JEDEC MO-178.
0.2 C A B
1
34
5
2
INDEX AREA
PIN 1
GAGE PLANE
SEATING PLANE
0.1 C
SCALE 4.000
www.ti.com
EXAMPLE BOARD LAYOUT
0.07 MAX
ARROUND 0.07 MIN
ARROUND
5X (1.1)
5X (0.6)
(2.6)
(1.9)
2X (0.95)
(R0.05) TYP
4214839/C 04/2017
SOT-23 - 1.45 mm max heightDBV0005A
SMALL OUTLINE TRANSISTOR
NOTES: (continued)
4. Publication IPC-7351 may have alternate designs.
5. Solder mask tolerances between and around signal pads can vary based on board fabrication site.
SYMM
LAND PATTERN EXAMPLE
EXPOSED METAL SHOWN
SCALE:15X
PKG
1
34
5
2
SOLDER MASK
OPENING
METAL UNDER
SOLDER MASK
SOLDER MASK
DEFINED
EXPOSED METAL
METAL
SOLDER MASK
OPENING
NON SOLDER MASK
DEFINED
(PREFERRED)
SOLDER MASK DETAILS
EXPOSED METAL
www.ti.com
EXAMPLE STENCIL DESIGN
(2.6)
(1.9)
2X(0.95)
5X (1.1)
5X (0.6)
(R0.05) TYP
SOT-23 - 1.45 mm max heightDBV0005A
SMALL OUTLINE TRANSISTOR
4214839/C 04/2017
NOTES: (continued)
6. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
7. Board assembly site may have different recommendations for stencil design.
SOLDER PASTE EXAMPLE
BASED ON 0.125 mm THICK STENCIL
SCALE:15X
SYMM
PKG
1
34
5
2
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