AS4PMHM3/87A Equivalent & Substitute Parts

Part Overview

The AS4PMHM3/87A is a 1000 V avalanche diode with 2.4 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 is classified as discontinued at DiGi Electronics. The part is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1) and operates across a junction temperature range of -55°C to 175°C. Equivalent and substitute parts are necessary due to product discontinuation status and to provide alternative sourcing options while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	1000 V
Current - Average Rectified (Io)	2.4 A
Voltage - Forward (Vf) (Max) @ If	962 mV @ 2 A
Reverse Recovery Time (trr)	1.8 µs
Current - Reverse Leakage @ Vr	10 µA @ 1000 V
Capacitance @ Vr, F	60 pF @ 4 V, 1 MHz
Package / Case	TO-277, 3-PowerDFN
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C to 175°C
Technology	Avalanche
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the AS4PMHM3/87A 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): 2.4 A
Reverse Recovery Time (trr): 1.8 µs
Current - Reverse Leakage @ Vr: 10 µA @ 1000 V
Capacitance @ Vr, F: 60 pF @ 4 V, 1 MHz
Package / Case: TO-277, 3-PowerDFN
Mounting Type: Surface Mount
Operating Temperature - Junction: -55°C to 175°C
Technology: Avalanche

All substitute parts maintain identical values across these parameters. Variations in forward voltage characteristics and product status (active versus discontinued) do not preclude substitution when all critical electrical and mechanical parameters align.

Parameter Comparison

Parameter	AS4PMHM3/87A	AS4PMHM3_A/I	AS4PM-M3/86A	AS4PM-M3/87A
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	1000 V	1000 V
Current - Average Rectified (Io)	2.4 A	2.4 A	2.4 A	2.4 A
Voltage - Forward (Vf) (Max) @ If	962 mV @ 2 A	1.1 V @ 4 A	962 mV @ 2 A	962 mV @ 2 A
Reverse Recovery Time (trr)	1.8 µs	1.8 µs	1.8 µs	1.8 µs
Current - Reverse Leakage @ Vr	10 µA @ 1000 V	10 µA @ 1000 V	10 µA @ 1000 V	10 µA @ 1000 V
Capacitance @ Vr, F	60 pF @ 4 V, 1 MHz	60 pF @ 4 V, 1 MHz	60 pF @ 4 V, 1 MHz	60 pF @ 4 V, 1 MHz
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
Operating Temperature - Junction	-55°C to 175°C	-55°C to 175°C	-55°C to 175°C	-55°C to 175°C
Technology	Avalanche	Avalanche	Avalanche	Avalanche
Product Status	Discontinued at DiGi Electronics	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AS4PMHM3_A/I is a direct manufacturer equivalent with active product status. This part carries automotive-grade qualification (AEC-Q101) and is supplied in Tape & Reel packaging. The forward voltage specification differs at a different measurement point (1.1 V @ 4 A versus 962 mV @ 2 A), but all critical electrical parameters remain equivalent. This part is suitable for applications requiring automotive-qualified components.

AS4PM-M3/86A is a parametric equivalent with active product status and the highest inventory availability (4997 pcs). Forward voltage characteristics match the main part specification (962 mV @ 2 A). This part is supplied in Tape & Reel packaging and maintains full ROHS3 compliance.

AS4PM-M3/87A is a parametric equivalent with active product status. Forward voltage characteristics match the main part specification (962 mV @ 2 A). This part is supplied in Tape & Reel packaging and maintains full ROHS3 compliance. Inventory availability is 966 pcs.

All substitute parts maintain identical electrical performance across reverse voltage, average rectified current, reverse recovery time, reverse leakage current, and capacitance specifications. Selection among active alternatives should be based on packaging requirements, inventory availability, and application-specific qualification needs.

Frequently Asked Questions (FAQ)

Q: Can AS4PMHM3_A/I replace AS4PMHM3/87A in all applications?

A: Yes. Both parts maintain identical reverse voltage (1000 V), average rectified current (2.4 A), reverse recovery time (1.8 µs), reverse leakage current (10 µA @ 1000 V), and capacitance (60 pF @ 4 V, 1 MHz) specifications. The forward voltage is specified at different measurement points but does not affect substitution eligibility. AS4PMHM3_A/I carries automotive qualification (AEC-Q101), which may be required for specific applications.

Q: What is the difference between AS4PM-M3/86A and AS4PM-M3/87A?

A: Both parts are parametric equivalents with identical electrical specifications and active product status. The primary difference is inventory availability: AS4PM-M3/86A has 4997 pcs in stock, while AS4PM-M3/87A has 966 pcs. Both are supplied in Tape & Reel packaging.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use the TO-277, 3-PowerDFN package in surface mount configuration. Mechanical compatibility is maintained across all alternatives.

Q: Why is the forward voltage specification different for AS4PMHM3_A/I?

A: Forward voltage is measured at different current levels: AS4PMHM3_A/I is specified at 1.1 V @ 4 A, while other parts are specified at 962 mV @ 2 A. These represent the same diode characteristic measured at different operating points and do not affect substitution compatibility.

Q: What is the product status significance?

A: AS4PMHM3/87A is discontinued at DiGi Electronics. The three substitute parts (AS4PMHM3_A/I, AS4PM-M3/86A, and AS4PM-M3/87A) all have active product status, ensuring continued availability and supply chain reliability.

Q: Are all parts ROHS3 compliant?

A: Yes. The main part and all substitute parts are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level).

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