AS3PMHM3/87A Equivalent & Substitute Parts

Part Overview

The AS3PMHM3/87A is a 1000 V avalanche diode rated for 2.1 A average rectified current in a surface mount TO-277A (SMPC) package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is part of the eSMP® series and meets AEC-Q101 automotive qualification standards. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	1000	V
Current - Average Rectified (Io)	2.1	A
Voltage - Forward (Vf) (Max) @ If	920 mV @ 1.5 A	mV @ A
Reverse Recovery Time (trr)	1.2	µs
Current - Reverse Leakage @ Vr	10	µA @ 1000 V
Capacitance @ Vr, F	37	pF @ 4V, 1MHz
Operating Temperature - Junction	-55 to 175	°C
Package / Case	TO-277, 3-PowerDFN
Technology	Avalanche
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the AS3PMHM3/87A is determined by strict equivalence across the following critical parameters:

Electrical Parameters (Must Match):

Voltage - DC Reverse (Vr) (Max): 1000 V
Current - Average Rectified (Io): 2.1 A
Reverse Recovery Time (trr): 1.2 µs
Current - Reverse Leakage @ Vr: 10 µA @ 1000 V
Capacitance @ Vr, F: 37 pF @ 4V, 1MHz
Operating Temperature - Junction: -55°C to 175°C

Mechanical Parameters (Must Match):

Package / Case: TO-277, 3-PowerDFN
Mounting Type: Surface Mount
Supplier Device Package: TO-277A (SMPC)

Compliance Parameters (Must Match):

Technology: Avalanche
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Status: REACH Unaffected

The substitute parts identified below meet all critical electrical, mechanical, and compliance requirements for direct substitution.

Parameter Comparison

Parameter	AS3PMHM3/87A (Main)	AS3PMHM3_A/I	AS3PM-M3/86A	AS3PM-M3/87A
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	1000 V	1000 V
Current - Average Rectified (Io)	2.1 A	2.1 A	2.1 A	2.1 A
Voltage - Forward (Vf) (Max) @ If	920 mV @ 1.5 A	1.1 V @ 3 A	920 mV @ 1.5 A	920 mV @ 1.5 A
Reverse Recovery Time (trr)	1.2 µs	1.2 µs	1.2 µs	1.2 µs
Current - Reverse Leakage @ Vr	10 µA @ 1000 V	10 µA @ 1000 V	10 µA @ 1000 V	10 µA @ 1000 V
Capacitance @ Vr, F	37 pF @ 4V, 1MHz	37 pF @ 4V, 1MHz	37 pF @ 4V, 1MHz	37 pF @ 4V, 1MHz
Operating Temperature - Junction	-55°C to 175°C	-55°C to 175°C	-55°C to 175°C	-55°C to 175°C
Package / Case	TO-277, 3-PowerDFN	TO-277, 3-PowerDFN	TO-277, 3-PowerDFN	TO-277, 3-PowerDFN
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Series	eSMP®	eSMP®	eSMP®	eSMP®
Technology	Avalanche	Avalanche	Avalanche	Avalanche
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Discontinued at DiGi Electronics	Active	Active	Active
Inventory Status	802 Pcs New Original In Stock	813 Pcs New Original In Stock	682 Pcs New Original In Stock	766 Pcs New Original In Stock

Engineering Selection Recommendations

AS3PMHM3_A/I is a direct functional equivalent with active product status. This part maintains all critical electrical parameters including 1000 V reverse voltage, 2.1 A average rectified current, 1.2 µs reverse recovery time, and identical junction temperature range. The packaging and mounting specifications are identical. The forward voltage specification differs (1.1 V @ 3 A versus 920 mV @ 1.5 A), reflecting measurement at different operating points; both specifications are within the same device family characteristics. This part is supplied in Tape & Reel packaging and carries full AEC-Q101 automotive qualification and ROHS3 compliance.

AS3PM-M3/86A and AS3PM-M3/87A are parametric equivalents with active product status. Both parts maintain identical electrical specifications to the main part, including forward voltage of 920 mV @ 1.5 A, reverse recovery time of 1.2 µs, and all other critical parameters. Both are supplied in Tape & Reel packaging with full automotive qualification and compliance certifications. These parts represent the most direct electrical and mechanical equivalents.

All three substitute parts are manufactured by the same supplier (Vishay General Semiconductor - Diodes Division), belong to the eSMP® series, and meet AEC-Q101 automotive qualification requirements. Selection among these alternatives should be based on packaging requirements (Tape & Reel availability) and current inventory status.

Frequently Asked Questions (FAQ)

Q: Can AS3PMHM3_A/I be used as a direct replacement for AS3PMHM3/87A?

A: Yes. AS3PMHM3_A/I meets all critical electrical parameters: 1000 V reverse voltage, 2.1 A average rectified current, 1.2 µs reverse recovery time, and identical junction temperature range. The package, mounting type, and compliance certifications are identical. The forward voltage is specified at a different operating point (1.1 V @ 3 A) but represents the same device family. This part is currently in active production status.

Q: What is the difference between AS3PM-M3/86A and AS3PM-M3/87A?

A: Both parts are parametric equivalents with identical electrical specifications. The designation difference reflects manufacturing or date code variations within the same product line. Both maintain 1000 V reverse voltage, 2.1 A average rectified current, 920 mV forward voltage @ 1.5 A, and 1.2 µs reverse recovery time. Both are suitable for direct substitution.

Q: Are all substitute parts available in the same packaging as the original?

A: All substitute parts use the TO-277A (SMPC) surface mount package. The main part AS3PMHM3/87A was supplied in standard packaging. The substitute parts AS3PMHM3_A/I, AS3PM-M3/86A, and AS3PM-M3/87A are supplied in Tape & Reel (TR) packaging, which is standard for high-volume production and automated assembly.

Q: Do the substitute parts meet automotive qualification requirements?

A: Yes. All substitute parts carry AEC-Q101 automotive qualification and are classified as Automotive grade components. All parts maintain ROHS3 compliance, REACH Unaffected status, and Moisture Sensitivity Level 1 (Unlimited).

Q: Can these parts be used interchangeably in existing designs?

A: Yes. All substitute parts maintain identical electrical characteristics, package specifications, and mounting requirements. The TO-277A (SMPC) surface mount package and 3-PowerDFN case style are consistent across all parts. PCB layouts and thermal management designs require no modification.

Q: What is the significance of the forward voltage specification difference in AS3PMHM3_A/I?

A: The forward voltage specification of 1.1 V @ 3 A for AS3PMHM3_A/I versus 920 mV @ 1.5 A for other parts reflects measurement at different operating current levels. Both specifications are valid for the same device family and do not indicate incompatibility. Forward voltage increases with operating current in diodes; the measurements are taken at different points on the device characteristic curve.

Q: Are there any thermal or reliability differences between the substitute parts?

A: No. All parts maintain identical operating temperature range (-55°C to 175°C junction temperature), reverse recovery time (1.2 µs), and reverse leakage current (10 µA @ 1000 V). Thermal and reliability characteristics are equivalent across all parts.

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