MICROSMD050-2

Overview

The Littelfuse MICROSMD050-2 is a PolySwitch resettable PTC fuse designed for surface mount applications. It features a hold current of 500 mA and a trip current of 1 A at a maximum voltage of 24 VDC. The device has a maximum fault current rating of 100 A and operates within a temperature range of -40°C to +85°C. Its physical dimensions are 4.73 mm in length, 3.41 mm in width, and 0.62 mm in height, fitting the 1812 package style.

Feature Summary

• Provides automatic circuit protection against overcurrent and short circuit events through polymer positive temperature coefficient technology.
• Offers reliable resettable functionality without requiring manual replacement after fault clearance.
• Designed for surface mount installation on printed circuit boards to protect sensitive components.

Applications

• Protection of portable electronic devices and handheld equipment
• Overcurrent protection for battery-powered circuits
• Circuit safeguarding in telecommunications and networking equipment

Procurement Notes

Verify the specific suffix designation when ordering, as Littelfuse utilizes alphanumeric codes to denote packaging variations such as tape and reel quantities or moisture sensitivity levels. Confirm that the selected variant matches the required reflow soldering profile and storage conditions specified in the official datasheet to ensure component integrity upon arrival.

Selection Notes

Select this component based on its 500 mA hold current and 24 VDC rating to match the target circuit's nominal operating parameters. Ensure the PCB layout accommodates the 1812 footprint dimensions and allows adequate spacing for thermal dissipation during tripping events. Consider the maximum fault current capability relative to the available source current to prevent device damage.

Part Context

This part belongs to the microSMD series of PolySwitch resettable fuses, which are engineered for compact surface mount implementations. The series provides robust overcurrent protection in a small form factor suitable for modern electronics manufacturing processes. It represents a solid-state alternative to traditional one-time fusible links in consumer and industrial applications.

Replacement Considerations

Direct substitutes include other Littelfuse microSMD variants with matching electrical ratings, such as the MICROSMDCH050F-02, provided the voltage and current specifications align with the application requirements. Verify package compatibility and thermal characteristics before cross-referencing with generic PPTC devices from other manufacturers.

FAQ

What is the maximum interrupting rating for the MICROSMD050-2?

The device has a maximum fault current rating of 100 A, allowing it to safely handle high fault currents without catastrophic failure.

Does the MICROSMD050-2 require manual replacement after tripping?

No, it is a resettable fuse that automatically returns to a low-resistance state once the overcurrent condition is removed and the device cools down.