MICROSMD035F-2

Overview

The MICROSMD035F-2 is a surface-mount polymer PTC resettable fuse from the Littelfuse microSMD series. It features a maximum voltage rating of 6V DC, a hold current (Ih) of 0.35A, and a trip current (It) of 0.75A with a typical trip time of 0.2s. The device has a minimum initial resistance of 0.32Ω and a maximum post-trip resistance of 1.3Ω. It operates within a temperature range of -40°C to 85°C and dissipates up to 0.8W. The component measures 3.43mm in length and 0.62mm in height, utilizing matte tin terminals for SMT assembly.

Feature Summary

• Provides automatic circuit protection by increasing resistance during overcurrent events to limit fault current.
• Offers resettable functionality that restores normal operation after the fault condition is removed and the device cools down.
• Designed for surface mount technology with a low-profile package suitable for space-constrained PCB layouts.

Applications

• Portable electronics and handheld devices
• Computer peripheral interfaces
• Consumer multimedia equipment
• Automotive electronics applications

Procurement Notes

Verify the specific voltage rating requirement against the system design, as this model is rated for 6V DC only. Confirm that the hold current of 0.35A aligns with the continuous operational load without causing nuisance tripping. Ensure the peak inrush current does not exceed the trip threshold of 0.75A during startup phases. Check that the maximum operating temperature of the application environment remains within the specified -40°C to 85°C range to guarantee reliable performance.

Selection Notes

Select this component when a compact, low-voltage circuit protection solution is required for sensitive electronics. The microSMD form factor is ideal for applications where board space is limited compared to larger through-hole fuses. Consider the 0.35A hold current carefully to ensure it supports the target circuit's normal operating current while providing adequate margin against transient spikes that do not constitute faults.

Part Context

This part belongs to the PolySwitch microSMD series, which represents a line of miniaturized resettable fuses designed for modern surface-mount manufacturing processes. The series focuses on reducing footprint size while maintaining reliable overcurrent protection capabilities for various electronic industries.

Replacement Considerations

The SMD1206P035TSA is listed as an obsolete predecessor. The MICROSMD035F-2 serves as a direct replacement option for discontinued designs requiring similar electrical characteristics in a surface-mount format.

FAQ

What is the maximum voltage rating for the MICROSMD035F-2?

The maximum voltage rating for this component is 6V DC.

Does this fuse require manual replacement after a fault?

No, it is a resettable device that automatically returns to a low-resistance state once the fault is cleared and the unit cools down.