SMD1812P125TSA

Ptc Resettable Fuses Overview

The Littelfuse SMD1812P125TSA is a surface-mount PolySwitch resettable PTC fuse from the SMD-P series. It features a 1812 (4532 metric) package with a maximum holding current of 1.25 A and a trip current of 2.5 A. The device supports a maximum voltage rating of 6 VDC and has a maximum fault current rating of 100 A. Initial resistance is typically 140 mΩ, with a maximum post-trip resistance of 280 mΩ. It operates within a temperature range of -40°C to +85°C.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection for circuits by raising resistance as it heats to limit current flow.
• Offers automatic recovery after cooling down, eliminating the need for manual replacement following an overcurrent event.
• Designed for surface mount applications to optimize board space while protecting components and ICs.

Ptc Resettable Fuses Applications

• Protection of actuators in commercial and passenger vehicles
• Circuit protection for screens and small motors
• Overcurrent safeguarding for power supply applications

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix 'TSA' against official Littelfuse documentation to confirm tape and reel specifications. Ensure the component meets RoHS compliance requirements for your assembly process. Cross-reference the manufacturer part number with authorized distributors to confirm availability and authenticity before procurement.

Ptc Resettable Fuses Selection Notes

Select this component when circuit protection requires a low-profile surface mount solution with a 1.25 A holding current. Consider the 6 VDC voltage rating and 1812 package dimensions during PCB layout. Evaluate the thermal environment to ensure operation remains within the specified -40°C to +85°C range for reliable performance.

Ptc Resettable Fuses Part Context

This device belongs to the Littelfuse PolySwitch SMD-P series, which provides solid-state resettable fuses for automotive, telecom, and power supply applications. These devices function as poly fuses that increase resistance upon heating to limit current, offering an alternative to traditional one-time fuses in compact electronic designs.

Ptc Resettable Fuses Replacement Considerations

Consult official Littelfuse substitution guides for verified equivalents. Generic replacements may differ in trip characteristics or physical dimensions. Verify compatibility with existing PCB footprints and thermal management requirements before substituting.