AS1FMHM3/I Equivalent & Substitute Parts

Part Overview

The AS1FMHM3/I is a 1000 V, 1.5 A avalanche diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount rectifier diode is packaged in DO-219AB (SMF) format and is designed for applications requiring high-voltage reverse bias protection and standard recovery characteristics. The part is actively produced, AEC-Q101 qualified for automotive applications, and maintains full RoHS3 compliance. Substitute parts are identified to address packaging format variations and inventory availability while maintaining identical electrical and mechanical specifications.

Substiute Parts

AS1FMHM3/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 937AS1FMHM3/I Datasheet

Current PartRFQ

AS1FM-M3/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 18776AS1FM-M3/H Datasheet

Parametric EquivalentRFQ

AS1FMHM3/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 18494AS1FMHM3/H Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AS1FMHM3/I are identified based on strict equivalence across all critical electrical and mechanical parameters. The substitution logic is based on the following key parameters:

Electrical Parameters (Must Match):

• Voltage - DC Reverse (Vr) (Max): 1000 V
• Current - Average Rectified (Io): 1.5 A
• Voltage - Forward (Vf) (Max) @ If: 1.15 V @ 1.5 A
• Reverse Recovery Time (trr): 1.3 µs
• Current - Reverse Leakage @ Vr: 5 µA @ 1000 V
• Capacitance @ Vr, F: 8.8 pF @ 4 V, 1 MHz

Mechanical Parameters (Must Match):

• Package / Case: DO-219AB
• Mounting Type: Surface Mount
• Technology: Avalanche

Compliance Parameters (Must Match):

• Grade: Automotive
• Qualification: AEC-Q101
• RoHS Status: ROHS3 Compliant

The substitute parts AS1FM-M3/H and AS1FMHM3/H differ from the main part only in packaging format (Cut Tape versus Tape & Reel), which does not affect electrical performance or mechanical compatibility in the application circuit. Both substitutes maintain identical electrical characteristics, thermal performance, and automotive qualification status.

Parameter Comparison

Engineering Selection Recommendations

All three parts—AS1FMHM3/I, AS1FM-M3/H, and AS1FMHM3/H—are functionally equivalent for circuit applications. Selection between these parts is determined by supply chain and procurement requirements rather than electrical performance.

AS1FMHM3/I (Tape & Reel): Suitable for high-volume automated assembly operations where components are fed directly from reel packaging into pick-and-place equipment.

AS1FM-M3/H and AS1FMHM3/H (Cut Tape): Suitable for lower-volume production, manual assembly, or applications where individual component handling is required.

All three parts maintain active product status, full automotive qualification (AEC-Q101), and RoHS3 compliance. The choice between substitutes does not affect circuit performance, thermal characteristics, or regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can AS1FM-M3/H or AS1FMHM3/H be used as direct replacements for AS1FMHM3/I in the same circuit?

A: Yes. All three parts are electrically and mechanically identical. The only difference is packaging format (Tape & Reel versus Cut Tape), which does not affect circuit performance or component functionality.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel packaging supplies components on a continuous reel suitable for automated assembly lines. Cut Tape packaging supplies components in strips cut from the reel, suitable for manual assembly or lower-volume production. Both formats contain the same component in the same DO-219AB package.

Q: Are all three parts qualified for automotive applications?

A: Yes. All three parts carry AEC-Q101 automotive qualification and are rated for the automotive grade. Operating temperature range is -55°C to 175°C for all variants.

Q: Do the substitute parts have the same reverse recovery time and forward voltage characteristics?

A: Yes. Reverse recovery time (trr) is 1.3 µs and forward voltage (Vf) is 1.15 V @ 1.5 A for all three parts. All electrical parameters are identical.

Q: Are there any compliance or regulatory differences between the three parts?

A: No. All three parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 and HTSUS 8541.10.0080. Compliance status is identical across all variants.

Q: Which part should be selected for new designs?

A: Selection depends on manufacturing process requirements. For automated assembly with reel feeding, use AS1FMHM3/I. For manual assembly or lower-volume applications, use AS1FM-M3/H or AS1FMHM3/H. Electrical performance and reliability are equivalent.