250R145TZR

Ptc Resettable Fuses Overview

The Littelfuse 250R145TZR is a PolySwitch resettable fuse designed for circuit protection. It features a maximum operating voltage of 60 VDC and a hold current of 145 mA. The device trips at 290 mA within 5 seconds. It has a maximum resistance range of 3 to 6 ohms and a power dissipation of 0.9 W. The component operates between -40°C and +85°C with radial leads spaced at 5 mm.

Ptc Resettable Fuses Feature Summary

• Provides automatic circuit protection through polymer positive temperature coefficient technology
• Offers repeatable overcurrent protection without requiring manual replacement
• Features fast time-to-trip characteristics for rapid response to fault conditions

Ptc Resettable Fuses Applications

• Overcurrent protection in low-voltage DC electronic circuits
• Protection for portable battery-powered devices
• Circuit safeguarding in communication equipment interfaces

Ptc Resettable Fuses Procurement Notes

Verify the exact part number suffix against official Littelfuse documentation, as distribution channels may list obsolete or alternative variants like 250R145TU. Confirm RoHS compliance status and lead-free manufacturing details directly from the manufacturer's current product data sheets before finalizing procurement specifications.

Ptc Resettable Fuses Selection Notes

Select this component when a 145 mA hold current and 60 VDC rating are required for radial PCB mounting. Ensure the application current remains below the hold threshold to prevent nuisance tripping. Verify that the trip current of 290 mA aligns with the circuit's tolerance for temporary surges during normal operation.

Ptc Resettable Fuses Part Context

This device belongs to the TRF250 series of PolySwitch resettable fuses manufactured by Littelfuse. The series is characterized by narrow resistance ranges and binned sorting. It serves as a reusable alternative to traditional one-time fuses in space-constrained electronics requiring reliable overcurrent protection.

Ptc Resettable Fuses Replacement Considerations

The 250R145TU is listed as an obsolete substitute. Verify compatibility with the 250R145TZR specifications if considering legacy replacements. Consult Littelfuse for current active equivalents to ensure availability and performance consistency.