TRF250-120UA

Ptc Resettable Fuses Overview

The Littelfuse TRF250-120UA is a PolySwitch polymer PTC resettable fuse designed for overcurrent protection in electronic circuits. It features a maximum operating voltage of 60V and an internal rating of 250V. The device maintains a hold current (Ih) of 120 mA and trips at a minimum current of 240 mA. It has a maximum trip time of 1 second and supports a maximum fault current of 3 A. Initial resistance (Ri) is typically 6 Ohms, with a maximum post-trip resistance (R1) of 16 Ohms. The component operates within a temperature range of -40°C to +85°C and utilizes a radial through-hole package.

Ptc Resettable Fuses Feature Summary

• Polymer-based self-resetting mechanism eliminates the need for manual replacement after fault conditions.
• Radial leaded construction facilitates easy integration into standard printed circuit board layouts.
• Certified by major safety agencies including UL, CSA, and TUV for global compliance.

Ptc Resettable Fuses Applications

• Building and home automation systems
• Telecommunications and networking devices
• Portable consumer electronics

Ptc Resettable Fuses Procurement Notes

Verify that the specific suffix 'UA' corresponds to the required packaging configuration, as Littelfuse offers variants such as bulk or tape-and-reel options for similar part numbers. Confirm RoHS 3 compliance status during sourcing. Ensure the selected variant matches the intended assembly process, whether manual insertion or automated placement, to avoid supply chain discrepancies.

Ptc Resettable Fuses Selection Notes

Select this component when circuit protection requires a low-profile, through-hole solution with a 120 mA holding current. The 60V rating suits low-voltage DC applications. Engineers should account for the 16 Ohm maximum resistance in high-current paths to minimize voltage drop. Verify that the 3 A maximum fault current capability exceeds potential surge levels in the target application environment.

Ptc Resettable Fuses Part Context

This part belongs to the Littelfuse TRF250 series of PolySwitch resettable fuses. The series is characterized by compact radial packages suitable for space-constrained designs. The TRF250 line provides reliable overcurrent protection across various industrial and consumer electronics sectors, offering a reusable alternative to traditional one-time fuses.

Ptc Resettable Fuses Replacement Considerations

Direct substitutes include other Littelfuse TRF250 series parts with matching electrical ratings, such as TRF250-120U-2. Cross-brand replacements must match the 120 mA hold current, 60V voltage rating, and radial package dimensions to ensure mechanical and electrical compatibility.

Ptc Resettable Fuses FAQ

What is the difference between the TRF250-120UA and TRF250-120?

The primary difference lies in the packaging and suffix designation. The TRF250-120UA specifies a particular reel or bulk configuration, whereas the base model number refers to the electrical specifications. Both share identical electrical parameters like 120 mA hold current and 60V rating.

Is the TRF250-120UA RoHS compliant?

Yes, the TRF250 series components are manufactured to be RoHS 3 compliant, ensuring they meet environmental standards for restricted hazardous substances in electronic equipment.