B57238 datasheet(2/15 Pages) EPCOS

2 / 15 page

1) For details on the capacitance Ctest as well as on the parameters k and n refer to "Application notes", chapters 1.6 and 1.7.

Applications

Switch-mode power supplies

Soft-start motors, e.g. in vacuum cleaners

Features

Useable in series connections

up to 265 VRMS

Coated thermistor disk for line applications

Kinked leads of tinned copper wire

Wide resistance range

UL approval (E69802)

Options

Resistance tolerance <20% and alternative

lead configurations available on request

Delivery mode

Bulk (standard),

cardboard tape, reeled or in Ammo pack

Dimensional drawing

Dimensions in mm

Approx. weight 3 g

General technical data

Climatic category

(IEC 60068-1)

55/170/21

Max. power

(at 25

°C)

Pmax

3.9

Resistance tolerance

∆R

R/RR

±20

Rated temperature

°C

Dissipation factor

(in air)

approx. 20

mW/K

Thermal cooling time constant

(in air)

approx. 80

Heat capacity

Cth

approx. 1600

mJ/K

Electrical specification and ordering codes

R25

Ω

Imax

(0...65

°C)

B25/100

Ctest1)

230 V

µF

Ctest1)

110 V

µF

Param.

for R(I)1)

Param.

for R(I)1)

Ordering code

2.5

8.4

2800

700

2800

0.984

1.36

B57238S0259M000

7.4

2900

700

2800

1.04

1.36

B57238S0309M000

4.7

6.6

2965

700

2800

1.20

1.37

B57238S0479M000

6.4

2965

700

2800

1.23

1.37

B57238S0509M000

6.0

2965

700

2800

1.34

1.38

B57238S0709M000

5.5

3065

700

2800

1.40

1.39

B57238S0809M000

5.0

3065

700

2800

1.50

1.39

B57238S0100M000

4.4

3165

700

2800

1.67

1.40

B57238S0150M000

4.0

3165

700

2800

1.69

1.39

B57238S0160M000

Inrush current limiters

B57238

ICLs

S238

Page 2 of 15

Please read Cautions and warnings and

Important notes at the end of this document.

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