1812L125DR

Ptc Resettable Fuses Overview

The Littelfuse 1812L125DR is a surface-mount PolySwitch resettable PTC fuse designed for overcurrent protection. It features a hold current of 1.25 A and a trip current of 2.5 A, with a maximum voltage rating of 6 VDC. The device has a maximum resistance of 140 mOhms and a fault current rating of 100 A. Operating within a temperature range of -40°C to +85°C, it utilizes a 1812 (4532 metric) package.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection by increasing resistance as the device heats during fault conditions.
• Offers automatic reset functionality after the fault condition is removed and the device cools down.
• Designed for surface-mount installation on printed circuit boards.

Ptc Resettable Fuses Applications

• Protection of portable electronics circuits
• Overcurrent safeguarding in peripheral equipment
• Circuit protection in telecommunications hardware

Ptc Resettable Fuses Procurement Notes

Verify that the specific suffix 'DR' aligns with the required packaging configuration for your assembly line. Confirm that the 6 VDC voltage rating and 1.25 A hold current are sufficient for the target application's electrical parameters. Ensure compatibility with standard reflow soldering profiles for surface-mount devices.

Ptc Resettable Fuses Selection Notes

Select this component when a low-profile surface-mount solution is required for low-voltage DC circuits. The 1812 package size offers a balance between current handling capability and board space efficiency. Consider the 140 mOhms maximum resistance impact on circuit power loss before finalizing the design.

Ptc Resettable Fuses Part Context

This part belongs to the Littelfuse 1812L series of PolySwitch resettable fuses. The series provides a range of hold currents and voltage ratings within the standardized 1812 footprint. These devices are commonly used where space constraints prevent the use of traditional replaceable fuses.

Ptc Resettable Fuses Replacement Considerations

Direct substitutes include other 1812L series parts with identical or compatible electrical ratings, such as the 1812L125/6PR. Verify that any replacement maintains the same voltage rating, hold current, and package dimensions to ensure mechanical and electrical compatibility.