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Littelfuse Inc.
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ST Series

Inrush Current Limiting Power Thermistors

Littelfuse Inc.

These 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.

Product Description

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.

Specifications
  • Current - Steady State Max:7A ~ 20A
  • Lead Spacing:0.310" (7.87mm)
  • Packaging:Bulk
  • R @ 25°C:1 Ohms ~ 5 Ohms
  • R @ Current:15 mOhms ~ 70 mOhms
Parts

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ST1R020BST1R020BICL 1 OHM 15% 20A 30.5MM 1 Ohms±15%20A15 mOhmsRoHS
ST2R515BST2R515BICL 2.5 OHM 20% 15A 30.5MM 2.5 Ohms±20%15A30 mOhmsRoHS
ST5R007BST5R007BICL 5 OHM 20% 7A 23.5MM 5 Ohms±20%7A70 mOhmsRoHS

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