AS1FM-M3/I Equivalent & Substitute Parts

Part Overview

The AS1FM-M3/I is an avalanche diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 1000 V DC reverse voltage and 1.5 A average rectified current. This surface mount component is housed in a DO-219AB package and is qualified to AEC-Q101 automotive standards. The part is currently active in production with ROHS3 compliance and REACH unaffected status.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the same package type and electrical specifications. Alternative packaging formats or inventory availability may necessitate component substitution in manufacturing and procurement scenarios.

Substiute Parts

AS1FM-M3/I

Vishay General Semiconductor - Diodes DivisionIn Stock: 1129AS1FM-M3/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

Substitution of the AS1FM-M3/I is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Parameters:

• 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 @ 4V, 1MHz
• Package / Case: DO-219AB (SMF)
• Technology: Avalanche
• Operating Temperature - Junction: -55°C to 175°C
• Grade: Automotive
• Qualification: AEC-Q101

The identified substitute parts AS1FM-M3/H and AS1FMHM3/H maintain identical electrical characteristics and package specifications. The primary difference between the main part and substitutes is the packaging format: the main part is supplied in Tape & Reel (TR) configuration, while the substitutes are supplied in Cut Tape (CT) configuration. Both packaging formats are compatible with automated assembly processes and do not affect component performance or functionality.

Parameter Comparison

Engineering Selection Recommendations

All three parts—AS1FM-M3/I, AS1FM-M3/H, and AS1FMHM3/H—are active products from Vishay General Semiconductor - Diodes Division with identical electrical specifications and automotive-grade qualification to AEC-Q101. Each part maintains full compliance with ROHS3 and REACH requirements.

Selection between these parts is determined by packaging format requirements:

AS1FM-M3/I is supplied in Tape & Reel (TR) format, suitable for high-volume automated assembly operations requiring continuous reel feeding.

AS1FM-M3/H and AS1FMHM3/H are supplied in Cut Tape (CT) format, suitable for lower-volume production runs, manual assembly processes, or applications where individual component handling is required.

All three parts are electrically and mechanically interchangeable within the DO-219AB surface mount package. Component selection should be based on production volume, assembly equipment compatibility, and inventory management requirements rather than electrical performance considerations.

Frequently Asked Questions (FAQ)

Q: Are AS1FM-M3/H and AS1FMHM3/H electrically identical to AS1FM-M3/I?

A: Yes. All three parts share identical electrical specifications including 1000 V reverse voltage rating, 1.5 A average rectified current, 1.15 V forward voltage drop at 1.5 A, 1.3 µs reverse recovery time, and 5 µA reverse leakage current at 1000 V. Operating temperature range, capacitance characteristics, and all other electrical parameters are equivalent.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging?

A: Tape & Reel packaging supplies components on a continuous reel suitable for automated pick-and-place assembly equipment. Cut Tape packaging supplies components on tape segments, typically used for lower-volume production, manual assembly, or component distribution. Both formats use identical component specifications and are compatible with standard surface mount assembly processes.

Q: Can I substitute AS1FM-M3/H or AS1FMHM3/H for AS1FM-M3/I in my design?

A: Yes. The substitute parts maintain full electrical and mechanical compatibility with the main part. Substitution is valid for any application where the AS1FM-M3/I is specified, provided the packaging format (Cut Tape) is compatible with your assembly process.

Q: Are all three parts automotive-qualified?

A: Yes. AS1FM-M3/I, AS1FM-M3/H, and AS1FMHM3/H are all automotive-grade components qualified to AEC-Q101 standards. All three parts are ROHS3 compliant and REACH unaffected.

Q: What is the DO-219AB package?

A: DO-219AB is a surface mount diode package designation (also referred to as SMF). All three parts use this identical package, ensuring mechanical compatibility in PCB layouts and assembly processes.

Q: Are there inventory differences between these parts?

A: Yes. AS1FM-M3/I has 1019 pieces in stock, AS1FM-M3/H has 18712 pieces in stock, and AS1FMHM3/H has 18410 pieces in stock. Inventory availability may influence component selection in procurement scenarios.