TCF250-120T-B-0.5

Ptc Resettable Fuses Overview

The TCF250-120T-B-0.5 is a polymeric PTC resettable fuse from the Littelfuse TCF250 series, designed for overcurrent protection in surface-mount applications. It features a maximum operating voltage of 60V DC and an internal rating of 250V. The component maintains a hold current of 120 mA and trips at 240 mA, with a maximum fault current capacity of 3 A. It exhibits a typical resistance of 6.3 Ohms and a time-to-trip of 600 ms. The device operates within a temperature range of -40°C to +85°C and utilizes a nonstandard SMD package.

Ptc Resettable Fuses Feature Summary

• Provides automatic resettable overcurrent protection using polymeric PTC technology
• Designed for surface-mount installation with a compact footprint
• Features fast time-to-trip response for circuit safeguarding
• Complies with RoHS standards and lead-free manufacturing requirements

Ptc Resettable Fuses Applications

• Telecommunications equipment line protection
• Portable electronic device circuits
• Consumer electronics power input stages
• Industrial control board overcurrent safeguarding

Ptc Resettable Fuses Procurement Notes

Verify that the specific suffix B-0.5 corresponds to the required nonstandard SMD package configuration rather than standard form factors. Confirm the 60V DC rating aligns with the target circuit's maximum operating voltage, as the internal 250V rating indicates insulation capability rather than continuous operating limit. Ensure procurement channels provide official Littelfuse documentation to validate the active product status and RoHS compliance for regulatory adherence.

Ptc Resettable Fuses Selection Notes

Select this component when a low-profile surface-mount solution is required for circuits operating up to 60V DC. The 120 mA hold current suits low-power signal lines or peripheral interfaces. Engineers must account for the 6.3 Ohm initial resistance in sensitive analog paths. The nonstandard SMD package requires specific PCB land pattern design compared to standard footprints. Verify thermal derating requirements if ambient temperatures approach the upper operational limit of 85°C.

Ptc Resettable Fuses Part Context

This part belongs to the TCF250 series, which offers telecom and line-rated PolySwitch fuses in various form factors including surface-mount, radial-leaded, and chip styles. The series provides agency recognition and is engineered for high-reliability applications requiring resettable protection. The TCF250-120T-B-0.5 specifically addresses the need for compact, fast-acting protection in space-constrained modern electronic assemblies.

Ptc Resettable Fuses FAQ

What is the difference between the maximum voltage and internal rating?

The maximum operating voltage is 60V DC, which is the limit for continuous operation. The 250V value represents the internal insulation rating, indicating the component can withstand higher voltages during transient events or open-circuit states without breakdown.

Is the package size standardized?

No, the datasheet specifies a 'Nonstandard SMD' package. Designers must consult the manufacturer's mechanical drawing for exact dimensions and pad layout, as it does not conform to common industry-standard footprints.