AS1FM-M3/I

Overview

The AS1FM-M3/I is a standard avalanche surface-mount rectifier manufactured by Vishay General Semiconductor. It features a single circuit configuration in an SMF (DO-219AB) package. Key electrical parameters include a maximum repetitive peak reverse voltage of 1000 V, a maximum DC forward current of 1.5 A, and a peak forward surge current of 30 A. The device exhibits a typical instantaneous forward voltage of 0.84 V at 1 A and 125 °C, with a maximum reverse current of 5 μA at rated VR and 25 °C. Thermal characteristics specify a junction-to-ambient thermal resistance of 130 °C/W and a junction-to-mount resistance of 20 °C/W.

Feature Summary

• Glass passivated pellet chip junction for enhanced reliability
• Compatible with automated placement processes
• Low forward voltage drop and low reverse current characteristics
• Meets MSL level 1 per J-STD-020 with LF maximum peak of 260 °C

Applications

• General purpose rectification of power supplies
• Inverter circuits
• Converter applications
• Freewheeling diodes for consumer electronics
• Automotive systems
• Telecommunication equipment

Procurement Notes

Verify the specific ordering code suffix to confirm the delivery mode and base quantity. The /I suffix indicates a commercial grade product packaged in a 13-inch diameter plastic tape and reel with a base quantity of 10,000 units. Ensure the selection aligns with the required environmental compliance standards, as the M3 designation confirms halogen-free and RoHS-compliant material categorization.

Selection Notes

Select this component when a high-voltage rating of 1000 V is required in a compact surface-mount form factor. The avalanche capability allows for energy absorption up to 20 mJ at IAS = 1.0 A. Consider the operating junction temperature range of -55 °C to +175 °C for demanding thermal environments. Verify that the 1.5 A average forward current meets the load requirements under derating conditions specified in the datasheet curves.

Part Context

This part belongs to the eSMP® series of standard avalanche surface-mount rectifiers from Vishay. It shares the SMF (DO-219AB) package outline with compatible SOD-123W dimensions. The AS1FM variant specifically denotes the 1000 V reverse voltage rating within the family that includes lower voltage options such as AS1FD (200 V), AS1FG (400 V), AS1FJ (600 V), and AS1FK (800 V).

Replacement Considerations

Direct substitutes within the same voltage class include AS1FK-M3/I (800 V) if voltage headroom permits, or other Vishay SMF packages like RS1FM-M3/I for fast recovery needs. Cross-brand replacements must match the DO-219AB footprint, 1000 V VRRM, and 1.5 A IF(AV) ratings.