ST Series - Inrush Current Limiters (Power Thermistors)

Series: ST
ST
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Disclaimer Notice

Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse.

Littelfuse inrush current limiters (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 inrush current limiting power thermistor 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 Inrush Current (Imax)

For inrush current limiters, the maximum continuous steady state current, either DC or RMS AC, which the device is capable of passing. The maximum steady state current for a Littelfuse inrush current limiter 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 Inrush Current (RImax)

For inrush current limiters, the approximate resistance of the device under maximum steady state current conditions.

Access specifications, certifications, check availability and order parts below

Catalog #Resis Ω @ 25°CResis Tol ± % @25°CImaxRImaxLead Dia.Sample capableEngineering DrawingSamplesCompare
 
ST0R713B0.725130.0250.04NoEngineering
ST10001B102010.650.024NoEngineering
ST10003B102030.20.032YESEngineeringOrder
ST10005B102050.20.04NoEngineering
ST10006B102060.150.04NoEngineering
ST10010B1020100.10.04NoEngineering
ST12001B122011.190.032NoEngineering
ST15004C152040.250.032NoEngineering
ST16002D162020.470.032NoEngineering
ST1R005B13050.090.024NoEngineering
ST1R020B115200.0150.04NoEngineering
ST1R030B125300.0150.04NoEngineering
ST1R508B1.52080.60.032NoEngineering
ST20001C20200.310.024NoEngineering
ST20002B20201.750.60.032NoEngineering
ST20100B200200.16.30.018NoEngineering
ST25002C252020.640.032NoEngineering
ST2R018B220180.030.04NoEngineering
ST2R503B2.52030.150.032NoEngineering
ST2R507B2.52070.050.032NoEngineering
ST2R509B2.52090.040.032NoEngineering
ST2R510B2.520100.040.04NoEngineering
ST2R515B2.520150.030.04NoEngineering
ST30002B302020.70.032NoEngineering
ST30003B302030.460.04NoEngineering
ST33001B332011.0750.024NoEngineering
ST33001C33201.50.740.032NoEngineering
ST33001D33200.51.4850.024NoEngineering
ST3R008B32080.050.04NoEngineering
ST3R017B320170.040.04NoEngineering
ST40002B402020.60.04NoEngineering
ST4R005B42050.110.032NoEngineering
ST5R002B52020.40.032NoEngineering
ST5R004B52040.170.032NoEngineering
ST5R005B52050.10.032NoEngineering
ST5R006B52060.1350.032NoEngineering
ST5R007B52070.070.032YESEngineeringOrder
ST5R008B52080.070.04NoEngineering
ST5R014B520140.060.04NoEngineering
ST7R004B72040.20.04NoEngineering
ST8R001B82010.50.024NoEngineering
ST8R003B82030.280.032NoEngineering
ST8R006B82060.1350.04NoEngineering