TR250-145U

Ptc Resettable Fuses Overview

The Littelfuse TR250-145U is a PolySwitch resettable PPTC fuse designed for overcurrent protection. It features a hold current of 0.145A and a trip current of 290mA. The device supports a maximum voltage rating of 60V DC and 250V RMS. It exhibits a minimum resistance of 3Ω and a maximum resistance of 6Ω in the tripped state. Power dissipation is rated at 0.9W to 1W. The component operates within a temperature range of -40°C to +85°C. Physical dimensions include a length of 11mm, width of 6.5mm, and height of 4.6mm, with a radial lead spacing of 5mm.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection by raising internal resistance when heated during fault conditions
• Offers automatic reset functionality after the fault condition is removed and the device cools down
• Designed for PCB mounting with radial leads for through-hole integration

Ptc Resettable Fuses Applications

• Protection of circuits, wiring harnesses, and PCB components
• Overcurrent protection for automotive actuators, screens, and small motors
• Telecom and networking equipment circuit safeguarding

Ptc Resettable Fuses Procurement Notes

Verify the exact part number suffix against official Littelfuse documentation to ensure correct voltage and current ratings. Confirm that the TR250 series designation aligns with the required 60V DC and 250V RMS specifications. Check for any specific agency approvals or RoHS compliance status required for the target application environment before finalizing procurement.

Ptc Resettable Fuses Selection Notes

Select this component based on the 0.145A hold current and 290mA trip current requirements for the protected circuit. Ensure the maximum operating voltage does not exceed 60V DC or 250V RMS. Consider the thermal environment, as the device operates up to +85°C. Verify that the radial lead pitch of 5mm fits the PCB layout constraints and that the power dissipation rating of 0.9W is sufficient for the application.

Ptc Resettable Fuses Part Context

This device belongs to the TRF250 series of PolySwitch resettable fuses from Littelfuse. These devices are solid-state PPTC switches that provide reusable overcurrent protection. The series includes various hold and trip current options tailored for different circuit protection needs across automotive, telecom, and general electronics applications.

Ptc Resettable Fuses Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.