TCF250-145

Ptc Resettable Fuses Overview

The Littelfuse TCF250-145 is a surface-mount PolySwitch resettable fuse designed for overcurrent protection in low-voltage circuits. It features a hold current of 145 mA and a trip current of 290 mA, with a maximum voltage rating of 60 VDC. The device exhibits an initial resistance range of 3 Ω to 6 Ω at 20°C and supports a maximum fault current of 3 A. It operates within a temperature range of -40°C to +85°C and dissipates up to 1 W of power. The component utilizes a non-standard SMD package with dimensions of 5.6 mm length and 2.5 mm height.

Ptc Resettable Fuses Feature Summary

• Provides automatic circuit recovery after fault conditions clear without manual replacement
• Offers rapid response time to overcurrent events for sensitive electronic protection
• Features low parasitic capacitance and flat frequency impedance characteristics

Ptc Resettable Fuses Applications

• Telecommunications equipment line protection
• Portable consumer electronics battery circuits
• Industrial control board overcurrent safeguarding

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix (e.g., -RB-B-0.5) against official Littelfuse documentation to confirm exact packaging and tape-and-reel specifications. Ensure the selected variant matches the required surface-mount footprint and lead-free compliance standards for the target assembly process. Cross-reference the datasheet for precise dimensional tolerances before PCB layout finalization.

Ptc Resettable Fuses Selection Notes

Select this component when a compact surface-mount solution is required for circuits operating below 60 VDC. The 145 mA hold current suits low-power signal lines or peripheral interfaces. Consider the 3 Ω to 6 Ω resistance range for voltage drop calculations. Verify that the 3 A maximum fault current exceeds potential surge levels in the application environment.

Ptc Resettable Fuses Part Context

Part of the TCF250 series, which includes telecom and line-rated resettable fuses. This series emphasizes fast tripping times and agency certifications including UL, CSA, and TÜV. The TCF250-145 specifically targets applications requiring reliable polymeric PTC protection in space-constrained designs.

Ptc Resettable Fuses Replacement Considerations

Direct substitutes include other Littelfuse TCF250 series variants with matching 145 mA hold currents. Verify equivalent voltage ratings and physical dimensions for direct pin-compatible replacement. Consult manufacturer cross-reference guides for confirmed alternative part numbers.