SMDC185F/33-2

Ptc Resettable Fuses Overview

The Littelfuse SMDC185F/33-2 is a surface-mount polymer PTC resettable fuse designed for circuit protection. It features a hold current of 1.85 A and a trip current of 3.7 A, operating at a maximum voltage of 33 VDC. The device has a maximum resistance of 126 mOhms and can withstand fault currents up to 40 A. It is housed in a 2920 (7351 metric) package with dimensions of 7.50 mm x 5.10 mm and a maximum thickness of 1.20 mm. The component operates within a temperature range of -40°C to +85°C and holds CSA, TUV, and UL certifications.

Ptc Resettable Fuses Feature Summary

• Provides overcurrent protection through automatic resistance increase during fault conditions
• Offers reliable resettable functionality without manual replacement after tripping
• Designed for surface mount installation on printed circuit boards

Ptc Resettable Fuses Applications

• Battery pack protection in portable electronics
• Overcurrent safeguarding for USB ports and data lines
• Circuit protection in automotive infotainment systems

Ptc Resettable Fuses Procurement Notes

Verify the specific suffix and marking code against the official Littelfuse datasheet to ensure correct voltage and current ratings. Confirm moisture sensitivity level handling requirements prior to assembly. Check for updated certification marks such as UL or TUV on the final product documentation. Ensure the ordering quantity matches the manufacturer's standard packaging specifications to avoid supply discrepancies.

Ptc Resettable Fuses Selection Notes

Select this component when a compact surface-mount solution is required for low-voltage circuits. The 33V rating suits applications like USB interfaces or battery management systems. Consider the 1.85A hold current for steady-state operation limits. Evaluate the 2920 package size against available PCB real estate constraints. Verify thermal derating requirements if ambient temperatures exceed standard operating ranges.

Ptc Resettable Fuses Part Context

This part belongs to the SMDC series of PolySwitch resettable fuses from Littelfuse. The series focuses on providing robust overcurrent protection in small form factors suitable for modern electronic assemblies. These devices utilize polymer technology to balance low resistance with high fault tolerance.

Ptc Resettable Fuses Replacement Considerations

Cross-reference with other SMDC series variants for different voltage ratings. Check equivalent offerings from other manufacturers only if they match the exact 2920 footprint and electrical parameters. Verify that any substitute maintains the same agency approvals for regulatory compliance.