0603L003/36YR-A

Overview

The Littelfuse 0603L003/36YR-A is a surface-mount polymer PTC resettable fuse from the POLY-FUSE 0603L series. It features a maximum holding current of 30 mA and a trip current of 90 mA, with a maximum voltage rating of 36 VDC. The device offers a maximum fault current rating of 40 A and operates within a temperature range of -40°C to +85°C. Initial resistance is typically 6 Ohms minimum, while post-trip resistance is limited to 50 Ohms maximum. The component is housed in a compact 0603 (1608 metric) package.

Feature Summary

• Provides reliable overcurrent protection for sensitive electronic circuits through automatic resistance increase upon heating.
• Offers self-resetting functionality that restores circuit continuity after fault conditions clear without manual intervention.
• Designed for surface-mount assembly to support automated manufacturing processes on printed circuit boards.

Applications

• Protection of portable consumer electronics and mobile devices
• Overcurrent safeguarding for telecommunications equipment interfaces
• Circuit protection in automotive secondary systems

Procurement Notes

Verify the specific suffix 'A' against manufacturer documentation to confirm any distinct material or packaging variations compared to the standard 0603L003/36YR variant. Ensure compatibility with reflow soldering profiles and confirm RoHS compliance status for the specific production batch prior to integration into final assemblies.

Selection Notes

Select this component when space constraints require a 0603 footprint and low voltage operation near 36 VDC is necessary. The 30 mA holding current suits low-power signal lines, while the 40 A fault rating handles short-circuit events. Confirm that the 90 mA trip threshold aligns with the protected circuit's normal operating margin to prevent nuisance tripping during transient loads.

Part Context

This part belongs to the POLY-FUSE 0603L series of resettable fuses manufactured by Littelfuse Inc. The series utilizes conductive polymer technology to provide durable overcurrent protection. These devices are engineered for high-volume surface-mount applications, offering a robust alternative to traditional one-time fuses in modern electronic designs requiring serviceability.

Replacement Considerations

The standard 0603L003/36YR is listed as a parameter-equivalent substitute. Verify electrical equivalence and physical dimensions before swapping, as suffix differences may indicate variations in tape-and-reel specifications or minor material changes not reflected in basic ratings.