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