MICROSMD075F-2

Overview

The MICROSMD075F-2 is a PolySwitch resettable fuse manufactured by Littelfuse Inc., designed for surface-mount applications. It features a hold current of 350 mA and a trip current of 750 mA, with a maximum voltage rating of 6 VDC. The device offers a maximum interrupting current (Imax) of 100 A and an initial resistance of 320 mOhms. Operating within a temperature range of -40°C to +85°C, it utilizes a polymer PTC technology housed in a compact 1206 (3216 metric) package. This component provides reliable circuit protection against overcurrent conditions while maintaining low profile dimensions suitable for dense PCB layouts.

Feature Summary

• Polymer PTC technology enabling automatic reset after fault clearance
• Compact 1206 surface-mount footprint for space-constrained designs
• Low initial resistance to minimize power loss during normal operation
• Fast time-to-trip response for effective overcurrent protection

Applications

• Portable electronics and mobile devices
• Battery packs and battery management systems
• Telephony and broadband equipment
• Automotive and industrial control circuits

Procurement Notes

Verify the specific suffix designation when ordering, as Littelfuse uses suffixes to denote voltage ratings and package variations. Confirm that the selected variant matches the required 6VDC rating and 350mA hold current for your application. Ensure compliance with RoHS directives if required by your manufacturing standards. Check moisture sensitivity levels and storage conditions prior to assembly to maintain device integrity.

Selection Notes

Select this component based on the 6VDC maximum voltage requirement and the 350mA hold current threshold. Evaluate the thermal environment to ensure the operating temperature range of -40°C to +85°C meets system demands. Consider the physical dimensions of the 1206 package for PCB layout compatibility. Assess the trip current characteristics to ensure adequate protection without nuisance tripping under normal load conditions.

Part Context

The MICROSMD075F-2 belongs to the microSMD series of PolySwitch resettable fuses from Littelfuse. This series is engineered for high-volume electronics assembly, offering a balance of performance and size. It serves as a reusable alternative to traditional one-time fuses, reducing maintenance costs and improving system reliability in consumer and industrial applications where space is limited.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.