ST3R017B

Overview

The ST3R017B is a radial lead inrush current limiter (ICL) manufactured by Littelfuse Inc. It features a nominal resistance of 3 Ohms with a tolerance of ±20% at 25°C. The device supports a maximum steady-state current of 17 A and has a cold resistance of 40 mOhms. The component measures 1.475 inches (37.47mm) in length and utilizes bulk packaging.

Feature Summary

• Provides inrush current limiting functionality for circuit protection
• Features low cold resistance to minimize power loss during operation
• Supports high steady-state current handling capabilities

Applications

• Power supply input stages
• Transformer primary circuits
• Capacitive load protection

Procurement Notes

This product is officially marked as obsolete and is no longer manufactured by Littelfuse Inc. Orders are non-cancelable and non-returnable. Verify availability through secondary market channels or consider replacement alternatives due to discontinuation status.

Selection Notes

Select this component only if the specific 3 Ohm resistance and 17 A current rating match the design requirements. Note that the part is discontinued; ensure long-term supply chain viability before integration into new designs.

Part Context

The ST3R017B belongs to the ST Series of inrush current limiters, which are power thermistors designed to protect electronic equipment from high initial charging currents. These components are typically used in AC-DC converters and other power applications requiring surge suppression.

Replacement Considerations

As an obsolete part, direct substitutes should be sourced from Littelfuse's MROplus program or equivalent series within the ST family. Cross-reference with available ICLs offering similar 3 Ohm resistance and 17 A ratings.