SMD1812P014TFA

Ptc Resettable Fuses Overview

The SMD1812P014TFA is a surface-mount PolySwitch resettable PTC device from Littelfuse, designed for overcurrent protection in electronic circuits. It belongs to the POLY-FUSE series and utilizes a polymer positive temperature coefficient material that increases resistance upon heating to limit current flow during fault conditions. The component features an SMD/SMT end termination style and is packaged in a standard 1812 (4532 metric) footprint with dimensions of 4.73 mm length, 3.41 mm width, and 0.7 mm height. Key electrical parameters include a hold current of 0.14 A, a trip current of 0.28 A, and a maximum voltage rating of 8 VDC. The device offers a minimum resistance of 60 mOhms and can withstand a maximum fault current of 40 A. It operates within a temperature range of -40°C to +85°C and has a power dissipation rating of 1 W.

Ptc Resettable Fuses Feature Summary

• Provides reliable overcurrent protection by raising resistance as it heats to limit current flow
• Solid-state design eliminates the need for replacement after tripping events
• Compact surface-mount form factor optimizes board space utilization

Ptc Resettable Fuses Applications

• Protection of portable electronics and battery-powered devices
• Overcurrent safeguarding in telecommunications equipment
• Circuit protection for automotive applications requiring compact solutions

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix 'TFA' against official Littelfuse documentation to confirm tape and reel packaging specifications and quantity per reel. Ensure the part number matches the exact hold current and voltage ratings required for the target circuit design. Cross-reference with the latest datasheet revision to confirm compliance with RoHS directives and material declarations. Confirm availability status as distribution channels may vary for specific suffix variants.

Ptc Resettable Fuses Selection Notes

Select this component when a low-voltage, low-current resettable fuse is required for surface-mount assembly. Evaluate the hold current of 0.14 A against the normal operating current of the protected circuit to ensure stable performance without nuisance tripping. Consider the trip current of 0.28 A to verify adequate margin for inrush currents while maintaining protection against short circuits. Assess the thermal environment to ensure the device can dissipate heat effectively within the specified operating temperature range.

Ptc Resettable Fuses Part Context

This device is part of Littelfuse's POLY-FUSE family of PolySwitch resettable fuses, which are widely used for circuit protection. The 1812 package size represents a common industry standard for surface-mount components, balancing protection capability with board space constraints. As a resettable PTC device, it serves as an alternative to traditional fusible links, offering reusable protection characteristics.

Ptc Resettable Fuses Replacement Considerations

Direct substitutes must match the 0.14 A hold current, 8 VDC voltage rating, and 1812 package dimensions. Verify that any alternative device meets the same electrical and thermal requirements. Consult Littelfuse application notes for guidance on cross-referencing similar resettable fuse technologies.