AHRF100

Ptc Resettable Fuses Overview

The Littelfuse AHRF100 is a PolySwitch resettable PTC fuse designed for overcurrent protection in automotive and general electronic circuits. It features a maximum operating voltage of 16V and a hold current (Ih) of 1.0A. The device trips at a current of 2.0A with a maximum trip time of 4.8 seconds. Initial resistance (Ri) is typically 39 mOhms, while post-trip resistance (R1) has a maximum of 110 mOhms. It supports a maximum fault current of 100A and operates within a temperature range of -40°C to 125°C. The component utilizes a radial, disc-style through-hole package.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection for circuits, wiring harnesses, and PCB components
• Automotive-grade qualification ensuring performance in demanding environments
• Solid-state polymer construction raises resistance upon heating to limit current flow

Ptc Resettable Fuses Applications

• Protection for automotive actuators and small motors
• Circuit protection for commercial and passenger vehicle screens
• Overcurrent safeguarding for wiring harnesses and PCB components

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix or variant when ordering, as the base part number may correspond to different packaging options such as tape and reel or bulk quantities. Confirm that the selected unit meets the required AEC-Q200 automotive qualification standards if intended for automotive applications. Ensure the lead frame and terminal compatibility match the target PCB layout before finalizing procurement specifications.

Ptc Resettable Fuses Selection Notes

Select this component based on the 1.0A hold current and 16V maximum voltage rating to ensure proper circuit operation under normal conditions. Consider the 110 mOhms maximum post-trip resistance to evaluate potential voltage drop impacts during fault events. Verify that the radial lead spacing and physical dimensions fit the designated mounting area on the printed circuit board assembly.

Ptc Resettable Fuses Part Context

The AHRF100 belongs to the Littelfuse PolySwitch AHRF series, which specializes in resettable fuses for automotive and industrial markets. This series offers solid-state alternatives to traditional fusible links, providing reusable overcurrent protection. The radial leaded form factor facilitates easy insertion into standard through-hole manufacturing processes commonly used in automotive electronics assembly lines.

Ptc Resettable Fuses Replacement Considerations

Compatible substitutes include the AHRF100-2 and AHRF100-AP variants from the same manufacturer family. These parts share similar electrical characteristics but may differ in specific packaging configurations or minor mechanical attributes. Verify cross-reference data sheets to confirm identical hold and trip currents before implementation.