RXEF185-1

Ptc Resettable Fuses Overview

The Littelfuse RXEF185-1 is a PolySwitch radial-leaded PPTC resettable fuse designed for PCB mounting. It features a maximum voltage rating of 72 VDC and a hold current of 1.85 A. The device trips at a current of 3.7 A and supports a maximum fault current of 40 A. Initial resistance is typically 80 mOhms, rising to a maximum of 190 mOhms after tripping. Power dissipation is rated at 2.1 W. Operating temperature ranges from -40°C to +85°C. Dimensions include a 16.76 mm diameter and 3.00 mm height.

Ptc Resettable Fuses Feature Summary

• Provides overcurrent protection through automatic reset functionality upon cooling
• Offers high voltage tolerance suitable for diverse circuit applications
• Features low initial resistance for minimal power loss during normal operation

Ptc Resettable Fuses Applications

• Consumer electronics circuit protection
• Portable computing devices
• Telecommunications equipment
• Industrial control systems

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix designation to ensure correct packaging configuration, as variations exist between bulk, cut tape, and reel formats. Confirm RoHS compliance status against the latest manufacturer documentation before integration. Cross-reference the datasheet for precise thermal derating curves required for your specific ambient temperature conditions. Ensure lead spacing matches your PCB footprint design constraints.

Ptc Resettable Fuses Selection Notes

Select this component when a 72 VDC rating and 1.85 A hold current are required for radial mounting. Compare trip characteristics against circuit surge requirements to prevent nuisance tripping. Evaluate the 40 A maximum interrupt rating against potential fault currents in the application. Consider the physical dimensions and thermal environment to ensure adequate heat dissipation within the 85°C limit.

Ptc Resettable Fuses Part Context

This part belongs to the Littelfuse RXEF series of PolySwitch resettable fuses. The series provides comprehensive PPTC solutions with radial leads. It complements other variants like RKEF and RUEF by offering specific voltage and current combinations. The product line emphasizes compatibility with high-volume electronics manufacturing processes.

Ptc Resettable Fuses Replacement Considerations

Direct substitutes include RXEF185K-AP for equivalent electrical specifications with potentially different packaging. RUEF185-2 offers similar current ratings but operates at a lower 30 VDC maximum voltage. Verify that any replacement maintains the required 72 VDC rating and radial form factor.