B59412C1130B070 - EPCOS AG - Product.Network

PTC thermistors as

inrush current limiters

Leaded disks, coated, C1412, C1451 and C75*

Series/Type: B594**C1130B070 /

B5975*C01**A070

Date: August 2012

information contained therein without EPCOS' prior express consent is prohibited.

Applications

Inrush current limiter (charging resistor) for

smoothing and DC link capacitors

To replace high-power fixed resistors for

capacitor charging

Features

Self-protecting in case of malfunction of

short-circuit relay or internal short circuit of

capacitor

Inrush current limiters are not damaged

when directly connected to Vmax even without

additional current limitation

Marking: Type, manufacturer's logo,

reference temperature in °C and date code

YYWW

VDE approval for selected types

(licence number 104843 E)

RoHS-compatible

Delivery mode

Cardboard strips

Dimensional drawing

Dimensions in mm

Type wmax hmax thmax ∅d

C1412 15.0 19.0 7.5 0.8

C1451 15.0 19.0 7.5 0.8

C750 12.5 16.5 5.0 0.6

C751 12.5 16.5 7.0 0.6

C755 12.5 16.5 7.0 0.6

General technical data

Operating cycles at Vmax (charging of capacitor) Nc> 50000 cycles

Switching cycles at Vmax (failure mode) Nf> 100 cycles

Operating temperature range (V = 0) Top 40/+125 °C

Operating temperature range (V = Vmax) Top 20/+85 °C

Electrical specifications and ordering codes

Type Vmax

V AC

Vlink,max

V DC

Ω

∆RR

Tref

(typ.)

°C

Cth

J/K

τth

Approvals Ordering code

C1412 440 620 120 ±25 130 2.1 100 B59412C1130B070

C1451 440 620 56 ±25 130 2.1 100 B59451C1130B070

C750 260 360 25 ±25 115 1.0 100 X B59750C0120A070

C751 260 360 50 ±25 115 1.4 120 X B59751C0120A070

C755 560 800 500 ±25 110 1.4 120 X B59755C0115A070

Inrush current limiters

Leaded disks, coated

Page 2 of 11Please read Cautions and warnings and

Important notes at the end of this document.

Reliability data

Test Standard Test conditions ∆R25/R25

Electrical endurance,

cycling

Room temperature, Vlink,max

applied energy < Cth (Tref TA)

Number of cycles: 100 000

< 25%

Electrical endurance,

constant

IEC 60738-1 Storage at Vmax /Top,max (Vmax)

Test duration: 1000 h

< 25%

Damp heat IEC 60738-1 Temperature of air: 40 °C

Relative humidity of air: 93%

Duration: 56 days

Test according to IEC 60068-2-78

< 10%

Rapid change

of temperature

IEC 60738-1 T1= Top,min (0 V), T2= Top,max (0 V)

Number of cycles: 5

Test duration: 30 min

Test according to IEC 60068-2-14, test Na

< 10%

Vibration IEC 60738-1 Frequency range: 10 to 55 Hz

Displacement amplitude: 0.75 mm

Test duration: 3 ×2 h

Test according to IEC 60068-2-6, test Fc

< 5%

Climatic sequence IEC 60738-1 Dry heat: T = Top,max (0 V)

Test duration: 16 h

Damp heat first cycle

Cold: T = Top,min (0 V)

Test duration: 2 h

Damp heat 5 cycles

Tests performed according to

IEC 60068-2-30

< 10%

Inrush current limiters

Leaded disks, coated

Page 3 of 11Please read Cautions and warnings and

Important notes at the end of this document.

Characteristics

Minimum resistance of PTC thermistors

versus applied voltage (pulsed)

PTC resistance RPTC versus

PTC temperature TPTC

(measured at low signal voltage)

Switching time tSversus switching current IS

(measured at 25 °C in still air)

Residual current in high-ohmic state Ires as

function of applied voltage VPTC, typical

(measured at 25 °C in still air)

Inrush current limiters

Leaded disks, coated

Page 4 of 11Please read Cautions and warnings and

Important notes at the end of this document.

Characteristics

Minimum resistance of PTC thermistors

versus applied voltage (pulsed)

PTC resistance RPTC versus

PTC temperature TPTC

(measured at low signal voltage)

Switching time tSversus switching current IS

(measured at 25 °C in still air)

Residual current in high-ohmic state Ires as

function of applied voltage VPTC, typical

(measured at 25 °C in still air)

Inrush current limiters

Leaded disks, coated

Page 5 of 11Please read Cautions and warnings and

Important notes at the end of this document.

Calculation of the number of required PTC elements

Number of required PTC elements (connected in parallel) as function of capacitance and charging

voltage of smoothing or DC link capacitor:

N Number of required PTC thermistors connected in parallel

C Capacitance of smoothing or DC link capacitor in F

V Charging voltage of capacitor in V

Cth Heat capacity in J/K

Tref Reference temperature of PTC in °C

TA,max Expected maximum ambient temperature in °C

In case of large N values the resulting resistance of the parallel PTC network might be too low for

effective limitation of the charging current. In this case a combination of series and parallel

connected PTC thermistors can be used.

Inrush current limiters

Leaded disks, coated

Page 6 of 11Please read Cautions and warnings and

Important notes at the end of this document.

Cautions and warnings

General

EPCOS thermistors are designed for specific applications and should not be used for purposes

not identified in our specifications, application notes and data books unless otherwise agreed

with EPCOS during the design-in-phase.

Ensure suitability of thermistor through reliability testing during the design-in phase. The ther-

mistors should be evaluated taking into consideration worst-case conditions.

Storage

Store thermistors only in original packaging. Do not open the package before storage.

Storage conditions in original packaging: storage temperature 25 °C ... +45 °C, relative hu-

midity ≤75% annual mean, maximum 95%, dew precipitation is inadmissible.

Avoid contamination of thermistors surface during storage, handling and processing.

Avoid storage of thermistor in harmful environment with effect on function on long-term opera-

tion (examples given under operation precautions).

Use thermistor within the following period after delivery:

Through-hole devices (housed and leaded PTCs): 24 months

Motor protection sensors, glass-encapsulated sensors and probe assemblies: 24 months

Telecom pair and quattro protectors (TPP, TQP): 24 months

Leadless PTC thermistors for pressure contacting: 12 months

Leadless PTC thermistors for soldering: 6 months

SMDs in EIA sizes 3225 and 4032, and for PTCs with metal tags: 24 months

SMDs in EIA sizes 0402, 0603, 0805 and 1210: 12 months

Handling

PTCs must not be dropped. Chip-offs must not be caused during handling of PTCs.

Components must not be touched with bare hands. Gloves are recommended.

Avoid contamination of thermistor surface during handling.

Soldering (where applicable)

Use rosin-type flux or non-activated flux.

Insufficient preheating may cause ceramic cracks.

Rapid cooling by dipping in solvent is not recommended.

Complete removal of flux is recommended.

Standard PTC heaters are not suitable for soldering.

Inrush current limiters

Leaded disks, coated

Page 7 of 11Please read Cautions and warnings and

Important notes at the end of this document.

Mounting

Electrode must not be scratched before/during/after the mounting process.

Contacts and housing used for assembly with thermistor have to be clean before mounting. Es-

pecially grease or oil must be removed.

When PTC thermistors are encapsulated with sealing material, the precautions given in chapter

"Mounting instructions", "Sealing and potting" must be observed.

When the thermistor is mounted, there must not be any foreign body between the electrode of

the thermistor and the clamping contact.

The minimum force of the clamping contacts pressing against the PTC must be 10 N.

During operation, the thermistor’s surface temperature can be very high. Ensure that adjacent

components are placed at a sufficient distance from the thermistor to allow for proper cooling at

the thermistors.

Ensure that adjacent materials are designed for operation at temperatures comparable to the

surface temperature of thermistor. Be sure that surrounding parts and materials can withstand

this temperature.

Avoid contamination of thermistor surface during processing.

Operation

Use thermistors only within the specified temperature operating range.

Use thermistors only within the specified voltage and current ranges.

Environmental conditions must not harm the thermistors. Use thermistors only in normal at-

mospheric conditions. Avoid use in deoxidizing gases (chlorine gas, hydrogen sulfide gas, am-

monia gas, sulfuric acid gas etc), corrosive agents, humid or salty conditions. Contact with any

liquids and solvents should be prevented.

Be sure to provide an appropriate fail-safe function to prevent secondary product damage

caused by abnormal function (e.g. use VDR for limitation of overvoltage condition).

This listing does not claim to be complete, but merely reflects the experience of EPCOS AG.

Inrush current limiters

Leaded disks, coated

Page 8 of 11Please read Cautions and warnings and

Important notes at the end of this document.

Symbols and terms

A Area

C Capacitance

Cth Heat capacity

f Frequency

I Current

Imax Maximum current

IRRated current

Ires Residual current

IPTC PTC current

IrResidual currrent

Ir,oil Residual currrent in oil (for level sensors)

Ir,air Residual currrent in air (for level sensors)

IRMS Root-mean-square value of current

ISSwitching current

ISmax Maximum switching current

LCT Lower category temperature

N Number (integer)

NcOperating cycles at Vmax, charging of capacitor

NfSwitching cycles at Vmax, failure mode

P Power

P25 Maximum power at 25 °C

Pel Electrical power

Pdiss Dissipation power

RGGenerator internal resistance

Rmin Minimum resistance

RRRated resistance

∆RRTolerance of RR

RPParallel resistance

RPTC PTC resistance

Rref Reference resistance

RSSeries resistance

R25 Resistance at 25 °C

R25,match Resistance matching per reel/ packing unit at 25 °C

∆R25 Tolerance of R25

T Temperature

t Time

TAAmbient temperature

taThermal threshold time

Inrush current limiters

Leaded disks, coated

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Important notes at the end of this document.

TCFerroelectric Curie temperature

tESettling time (for level sensors)

TRRated temperature

Tsense Sensing temperature

Top Operating temperature

TPTC PTC temperature

tRResponse time

Tref Reference temperature

TRmin Temperature at minimum resistance

tSSwitching time

Tsurf Surface temperature

UCT Upper category temperature

V or Vel Voltage (with subscript only for distinction from volume)

Vc(max) Maximum DC charge voltage of the surge generator

VF,max Maximum voltage applied at fault conditions in protection mode

VRMS Root-mean-square value of voltage

VBD Breakdown voltage

Vins Insulation test voltage

Vlink,max Maximum link voltage

Vmax Maximum operating voltage

Vmax,dyn Maximum dynamic (short-time) operating voltage

Vmeas Measuring voltage

Vmeas,max Maximum measuring voltage

VRRated voltage

VPTC Voltage drop across a PTC thermistor

αTemperature coefficient

∆Tolerance, change

δth Dissipation factor

τth Thermal cooling time constant

λFailure rate

Lead spacing (in mm)

Abbreviations / Notes

Surface-mount devices

* To be replaced by a number in ordering codes, type designations etc.

+ To be replaced by a letter

All dimensions are given in mm.

The commas used in numerical values denote decimal points.

Inrush current limiters

Leaded disks, coated

Page 10 of 11Please read Cautions and warnings and

Important notes at the end of this document.

The following applies to all products named in this publication:

1. Some parts of this publication contain statements about the suitability of our products for

certain areas of application. These statements are based on our knowledge of typical re-

quirements that are often placed on our products in the areas of application concerned. We

nevertheless expressly point out that such statements cannot be regarded as binding

statements about the suitability of our products for a particular customer application.

As a rule, EPCOS is either unfamiliar with individual customer applications or less familiar

with them than the customers themselves. For these reasons, it is always ultimately incum-

bent on the customer to check and decide whether an EPCOS product with the properties de-

scribed in the product specification is suitable for use in a particular customer application.

2. We also point out that in individual cases, a malfunction of electronic components or

failure before the end of their usual service life cannot be completely ruled out in the

current state of the art, even if they are operated as specified. In customer applications

requiring a very high level of operational safety and especially in customer applications in

which the malfunction or failure of an electronic component could endanger human life or

health (e.g. in accident prevention or lifesaving systems), it must therefore be ensured by

means of suitable design of the customer application or other action taken by the customer

(e.g. installation of protective circuitry or redundancy) that no injury or damage is sustained by

third parties in the event of malfunction or failure of an electronic component.

3. The warnings, cautions and product-specific notes must be observed.

4. In order to satisfy certain technical requirements, some of the products described in this

publication may contain substances subject to restrictions in certain jurisdictions (e.g.

because they are classed as hazardous). Useful information on this will be found in our Ma-

terial Data Sheets on the Internet (www.epcos.com/material). Should you have any more de-

tailed questions, please contact our sales offices.

5. We constantly strive to improve our products. Consequently, the products described in this

publication may change from time to time. The same is true of the corresponding product

specifications. Please check therefore to what extent product descriptions and specifications

contained in this publication are still applicable before or when you place an order. We also

reserve the right to discontinue production and delivery of products. Consequently, we

cannot guarantee that all products named in this publication will always be available. The

aforementioned does not apply in the case of individual agreements deviating from the fore-

going for customer-specific products.

6. Unless otherwise agreed in individual contracts, all orders are subject to the current ver-

sion of the "General Terms of Delivery for Products and Services in the Electrical In-

dustry" published by the German Electrical and Electronics Industry Association

(ZVEI).

7. The trade names EPCOS, BAOKE, Alu-X, CeraDiode, CeraLink, CSMP, CSSP, CTVS,

DeltaCap, DigiSiMic, DSSP, FilterCap, FormFit, MiniBlue, MiniCell, MKD, MKK, MLSC,

MotorCap, PCC, PhaseCap, PhaseCube, PhaseMod, PhiCap, SIFERRIT, SIFI, SIKOREL,

SilverCap, SIMDAD, SiMic, SIMID, SineFormer, SIOV, SIP5D, SIP5K, ThermoFuse,

WindCap are trademarks registered or pending in Europe and in other countries. Further

information will be found on the Internet at www.epcos.com/trademarks.

Important notes

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