TRF250-145-RA-B-0.5

Ptc Resettable Fuses Overview

The Littelfuse TRF250-145-RA-B-0.5 is a PolySwitch resettable PPTC fuse designed for PCB mounting with radial leads. It features a 60 VDC maximum voltage rating and a 145 mA hold current. The device trips at 290 mA and supports a maximum trip current of 3 A. Initial resistance is specified at 14 ohms, with power dissipation up to 1 W. Operating temperature ranges from -40°C to +85°C. Dimensions include a height of 4.6 mm, length of 11 mm, width of 6.5 mm, and a lead spacing of 5 mm.

Ptc Resettable Fuses Feature Summary

• Provides automatic overcurrent protection by increasing resistance during fault conditions
• Radial leaded form factor enables through-hole PCB integration
• Resettable operation restores circuit continuity after cooling

Ptc Resettable Fuses Applications

• Protection of sensitive electronic components on printed circuit boards
• Overcurrent safeguarding in wiring harnesses
• Circuit protection in telecommunications equipment

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix configuration against official Littelfuse documentation to ensure correct lead orientation and packaging specifications. Confirm that the 60 VDC rating aligns with the target circuit requirements. Cross-reference the 145 mA hold current and 14 ohm initial resistance values with the latest datasheet to prevent specification mismatches during component selection.

Ptc Resettable Fuses Selection Notes

Select this component when a radial leaded resettable fuse is required for low-voltage DC circuits. Ensure the operating environment stays within the -40°C to +85°C range. Verify that the 3 A maximum trip current accommodates potential surge currents without nuisance tripping. Check physical footprint constraints against the 11 mm length and 5 mm lead spacing dimensions.

Ptc Resettable Fuses Part Context

This part belongs to the Littelfuse TRF250 series of PolySwitch resettable fuses. The series offers various hold currents and package options for general-purpose circuit protection. The TRF250 line is characterized by its reliability in limiting fault currents while maintaining a compact profile suitable for dense PCB layouts.

Ptc Resettable Fuses Replacement Considerations

Official substitutes within the same series include TRF250-145T-B-0.5 and TRF250-145. Verify identical electrical parameters such as hold current, voltage rating, and resistance before substitution.