AS1FK-M3/H

Overview

The AS1FK-M3/H is a standard recovery rectifier manufactured by Vishay General Semiconductor - Diodes Division. It features a maximum DC reverse voltage (Vr) of 800 V and an average forward rectified current (Io) of 1.5 A. The device utilizes the eSMP package, specifically DO-219AB-2, designed for surface mount applications. Key electrical parameters include a forward voltage (Vf) of 990 mV at 1 A, a maximum surge current of 30 A, and a reverse leakage current of 140 nA. The junction operating temperature range extends from -55°C to +175°C.

Feature Summary

• High voltage capability with 800 V reverse voltage rating
• Robust avalanche recovery characteristics for inductive load switching
• Compact surface mount packaging for space-constrained designs
• Extended high-temperature operation up to 175°C junction temperature

Applications

• High-voltage general-purpose rectification circuits
• Inductive load switching applications requiring avalanche ruggedness
• Power supply input stages
• Freewheeling diodes in DC-DC converters

Procurement Notes

Verify the specific suffix against official Vishay documentation to confirm exact binning or testing variations. Ensure the ordering part number matches the required package variant and compliance standards. Cross-reference the manufacturer's latest datasheet for any recent design changes or obsolescence notices before finalizing procurement specifications.

Selection Notes

Select this component for applications requiring high reverse voltage blocking in a compact SMD footprint. The 1.5 A current rating suits moderate power levels where size reduction is critical. Consider the 990 mV forward voltage drop for thermal management calculations. Verify that the circuit environment does not exceed the 175°C maximum junction temperature limit during peak operation.

Part Context

This device belongs to Vishay's eSMP series, which offers high-performance rectification in ultra-compact packages. The AS1FK variant specifically targets high-voltage applications within the 800 V range. It complements other Vishay rectifiers by providing avalanche capability in a small form factor suitable for modern dense PCB layouts.

Replacement Considerations

Consult Vishay's official substitution guide for verified alternatives. Ensure any replacement maintains the 800 V Vr, 1.5 A Io, and DO-219AB-2 package compatibility. Verify that substitute devices offer equivalent avalanche ratings and thermal performance.