TRF250-145T-2

Ptc Resettable Fuses Overview

The Littelfuse TRF250-145T-2 is a PolySwitch resettable PPTC device designed for overcurrent protection in printed circuit board applications. It features radial leads with a 5 mm spacing and operates within a temperature range of -40°C to +85°C. The component maintains a holding current of 145 mA and trips at 290 mA, supporting a maximum voltage of 60 V DC and a maximum fault current of 3 A. Its initial resistance is specified at 7.5 ohms, ensuring reliable circuit interruption during fault conditions.

Ptc Resettable Fuses Feature Summary

• Provides automatic circuit recovery after fault clearance without manual replacement
• Increases internal resistance significantly upon overheating to limit excessive current flow
• Designed for through-hole mounting on printed circuit boards using radial leads

Ptc Resettable Fuses Applications

• Overcurrent protection for portable electronic devices
• Protection of battery-powered equipment circuits
• Guarding peripheral interfaces against short circuits

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix 'T-2' indicates reel packaging when sourcing components. Confirm that the 145 mA holding current rating aligns with the target circuit's continuous operational requirements. Ensure the 60 V DC voltage rating exceeds the system's maximum operating voltage to prevent dielectric breakdown during normal use.

Ptc Resettable Fuses Selection Notes

Select this component based on its 145 mA holding current and 60 V DC rating to match the protected circuit's electrical parameters. Consider the 7.5 ohm initial resistance impact on signal integrity or power loss. Verify that the radial lead configuration fits the available PCB footprint and that the operating temperature range covers the intended environmental conditions.

Ptc Resettable Fuses Part Context

This part belongs to the Littelfuse TRF250 series of PolySwitch resettable fuses. These devices utilize polymer technology to provide reusable overcurrent protection. The series offers various current ratings and package options to suit different circuit protection needs across consumer electronics and industrial applications.

Ptc Resettable Fuses Replacement Considerations

Compatible substitutes include other Littelfuse TRF250 series variants with matching 145 mA holding current and 60 V DC ratings. Ensure any replacement maintains the same radial lead pitch and physical dimensions for proper PCB integration.

Ptc Resettable Fuses FAQ

What is the trip time specification for this device?

Official datasheets specify a trip time of 5 seconds under standard test conditions.

Does this component require manual resetting?

No, it is a self-resetting device that returns to low resistance once cooled down after the fault condition is removed.