RXE040-2

Ptc Resettable Fuses Overview

The Littelfuse RXE040-2 is a polymeric positive temperature coefficient (PPTC) resettable fuse designed for circuit protection. It features radial lead termination and a disc package suitable for PCB mounting. Key electrical specifications include a hold current of 400 mA, a trip current of 800 mA, and a maximum voltage rating of 72 VDC. The device supports a maximum fault current of 40 A and exhibits an initial resistance of 1.29 ohms. It operates within a temperature range of -40°C to +85°C with a lead spacing of 5.8 mm.

Ptc Resettable Fuses Feature Summary

• Provides automatic resettable overcurrent protection using polymeric PTC technology.
• Features radial lead construction for through-hole PCB mounting applications.
• Designed to handle high fault currents up to 40 A without permanent damage.

Ptc Resettable Fuses Applications

• Overcurrent protection in portable electronic devices
• Circuit safeguarding in automotive electronics
• Protection for communication equipment interfaces

Ptc Resettable Fuses Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheets. Confirm that the specific suffix '-2' matches the required radial disc package configuration. Ensure the procurement source provides valid traceability documentation for quality assurance purposes before finalizing orders.

Ptc Resettable Fuses Selection Notes

Select this component when a resettable fuse with a 400 mA hold current and 72 VDC rating is required. Consider the 1.29 ohm initial resistance for voltage drop calculations. Evaluate the thermal environment to ensure operation remains within the specified -40°C to +85°C range during normal and fault conditions.

Ptc Resettable Fuses Part Context

The RXE040-2 belongs to the Littelfuse RXE series of PTC resettable fuses. This series offers reliable circuit protection with fast response times. The part is distinct from similar models like RXEF040 by its specific packaging and parameter set, serving as a dedicated solution for radial mount requirements in consumer and industrial electronics.

Ptc Resettable Fuses Replacement Considerations

Public records indicate that the RXE040-2 is obsolete and no longer manufactured. Designers should evaluate available substitute part numbers provided by distributors or manufacturers for equivalent electrical characteristics and mechanical footprint compatibility.