st7r004b ussensor, st7r004b Datasheet

st7r004b

Manufacturer Part Number

st7r004b

Description

Inrush Current Limiting Power Thermistors

Manufacturer

ussensor

Datasheet

1.ST7R004B.pdf (2 pages)

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U.S. Sensor

1832 W. Collins Ave

Orange, CA 92867

Tel: 800-777-6467

Tel: 714-639-1000

Fax: 714-639-1220

Email:

sales@ussensor.com

U.S. Sensor’s inrush current limiting power thermistors are specially formulated and

processed NTC thermistors suitable for suppressing high inrush currents in switching

power supplies and other applications where the high initial starting currents are

undesirable. Their unique design enables them to handle extremely high current and

voltage levels. In a typical power supply application, the device is used in series with the

filter capacitors. Upon application of the initial voltage, the device, due to its relatively

high resistance, limits the current flow to an acceptable level until the capacitors are

charged. Thereafter, the device decreases in resistance substantially to a level where the

voltage drop across it is negligible.

Maximum Steady State Current (Imax)

For power thermistors, the

maximum continuous steady

state current, either DC or RMS

AC, which the device is capable

of passing. The maximum

steady state current for U.S.

Sensor power thermistors is

determined assuming a

maximum operating ambient

temperature of 65°C. If a

specific application requires

ambient temperature operation

above 65°C, custom designed

devices are available.

Resistance At Maximum Current (RImax)

For power thermistors, the approximate resistance of the device under maximum steady

state current conditions.

Inrush Current Limiting Power Thermistors

INRUSH CURRENT LIMITING POWER

THERMISTORS

View Photo

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st7r004b Summary of contents

Page 1

... U.S. Sensor Resistance At Maximum Current (RImax) 1832 W. Collins Ave Orange, CA 92867 For power thermistors, the approximate resistance of the device under maximum steady Tel: 800-777-6467 state current conditions. Tel: 714-639-1000 Fax: 714-639-1220 Email: sales@ussensor.com INRUSH CURRENT LIMITING POWER THERMISTORS View Photo ...

Page 2

... ST1R020B 1.0 20 ST1R030B 1.0 30 ST2R018B 2.0 18 ST2R503B 2.5 3 ST2R507B 2.5 7 ST2R509B 2.5 9 ST2R510B 2.5 10 ST2R515B 2.5 15 ST5R002B 5.0 2 ST5R005B 5.0 5 ST5R007B 5.0 7 ST7R004B 7.0 4 ST10003B 10.0 3 ST10005B 10.0 5 ST10006B 10.0 6 ST10010B 10.0 10 ST20002B 20.0 1.75 ST40002B 40.0 2 Note: All Dimensions are in Inches « Product Guide Dim. "D" Dim. "T" RI max Resis. (Max. Over (Max. Over @ Max. Coating) Coating) Current Ohms 0 ...

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