RXEF110K-AP

Ptc Resettable Fuses Overview

The RXEF110K-AP is a radial leaded PolySwitch resettable PTC fuse from Littelfuse, designed for overcurrent protection in electronic circuits. It features a maximum operating voltage of 72V and a hold current (Ih) of 1.1A. The trip current (It) is specified at 2.2A, with a maximum fault current rating of 40A. Initial resistance (Ri) is typically low, while post-trip resistance (R1) reaches a maximum of 380 mOhms. The device operates within a temperature range of -40°C to +85°C and utilizes a radial leaded form factor suitable for through-hole mounting.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection by increasing resistance as it heats during fault conditions
• Resettable functionality allows circuit restoration without manual replacement after cooling
• Radial leaded construction facilitates easy integration into printed circuit board assemblies

Ptc Resettable Fuses Applications

• Protection of computer motherboards and peripheral interfaces
• Overcurrent safeguarding for USB hubs, ports, and related peripherals
• Circuit protection in industrial control systems and modems
• Defense against short circuits in battery packs and consumer electronics

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix 'K' against official Littelfuse documentation to confirm if it denotes a specific packaging variant or compliance status distinct from the standard RXEF110 series. Ensure the component meets RoHS requirements for the intended application region. Cross-reference the datasheet for exact thermal derating curves and mechanical dimensions prior to finalizing procurement specifications.

Ptc Resettable Fuses Selection Notes

Select this component when a 1.1A hold current and 72V maximum voltage rating are required for radial mounted applications. Consider the 380 mOhms maximum post-trip resistance for voltage drop calculations in sensitive downstream circuits. Evaluate the 40A maximum fault current capability against potential short-circuit scenarios to ensure adequate safety margins for the protected load.

Ptc Resettable Fuses Part Context

This part belongs to the RXEF series of PolySwitch resettable fuses, which are polymer positive temperature coefficient devices. These components offer solid-state protection alternatives to traditional fusible links. The series is widely utilized in automotive, telecom, and general power supply applications where reusable overcurrent protection is necessary for system reliability and maintenance efficiency.

Ptc Resettable Fuses Replacement Considerations

The RXEF110-AP is listed as a direct substitute for the RXEF110K-AP. Verify that the substitute maintains identical electrical ratings and physical footprint compatibility before implementation.