AS4PM-M3/87A Equivalent & Substitute Parts

Part Overview

The AS4PM-M3/87A is an avalanche diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 1000 V DC reverse voltage and 2.4 A average rectified current. This component is part of the eSMP® series and is housed in a TO-277A (SMPC) surface mount package. The device is classified as Active product status and is RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Equivalent and substitute parts are identified when inventory constraints, manufacturing discontinuation, or supply chain requirements necessitate alternative component selection. Substitutes must maintain electrical compatibility across critical parameters including reverse voltage rating, current capacity, forward voltage characteristics, and package form factor.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution logic for the AS4PM-M3/87A is based on the following critical parameters that determine functional equivalence:

Primary Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 1000 V minimum
Current - Average Rectified (Io): 2.4 A minimum
Package / Case: Surface mount compatible form factor
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max): Forward voltage drop characteristics
Reverse Recovery Time (trr): Recovery speed classification
Operating Temperature - Junction: Thermal operating range
Technology: Avalanche or Standard rectifier technology

Substitute parts are grouped into two categories:

Parametric Equivalent: Parts that maintain identical or superior electrical specifications within the same package family, enabling direct substitution without circuit redesign.

Manufacturer Recommended: Parts that meet or exceed primary equivalence criteria but may differ in secondary parameters such as recovery speed or package form factor, requiring design verification for specific application requirements.

Parameter Comparison

Parameter	AS4PM-M3/87A	AS4PM-M3/86A	STTH310S
Manufacturer	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	STMicroelectronics
Category	Diodes, Rectifiers	Diodes, Rectifiers	Diodes, Rectifiers
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	1000 V
Current - Average Rectified (Io)	2.4 A	2.4 A	3 A
Voltage - Forward (Vf) (Max) @ If	962 mV @ 2 A	962 mV @ 2 A	1.7 V @ 3 A
Reverse Recovery Time (trr)	1.8 µs	1.8 µs	75 ns
Current - Reverse Leakage @ Vr	10 µA @ 1000 V	10 µA @ 1000 V	10 µA @ 1000 V
Technology	Avalanche	Avalanche	Standard
Package / Case	TO-277, 3-PowerDFN	TO-277, 3-PowerDFN	DO-214AB, SMC
Supplier Device Package	TO-277A (SMPC)	TO-277A (SMPC)	SMC
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55°C ~ 175°C	-55°C ~ 175°C	-40°C ~ 175°C
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

AS4PM-M3/86A - Parametric Equivalent

The AS4PM-M3/86A is a direct parametric equivalent to the AS4PM-M3/87A. Both components are manufactured by Vishay General Semiconductor - Diodes Division within the eSMP® series and share identical electrical specifications across all critical parameters: 1000 V reverse voltage, 2.4 A average rectified current, 962 mV forward voltage at 2 A, and 1.8 µs reverse recovery time. Both devices are housed in the TO-277A (SMPC) package and maintain identical operating temperature ranges (-55°C to 175°C). Compliance certifications are equivalent: ROHS3 Compliant, MSL 1 (Unlimited), and REACH Unaffected status. This substitute enables direct board-level replacement without circuit modification. Current inventory availability is 4997 pieces for AS4PM-M3/86A compared to 966 pieces for the main part number.

STTH310S - Manufacturer Recommended Substitute

The STTH310S is manufactured by STMicroelectronics and meets the primary equivalence criteria of 1000 V reverse voltage rating and exceeds the current requirement at 3 A (versus 2.4 A). This component is classified as a Standard technology rectifier rather than Avalanche technology. Key differences include: faster reverse recovery time (75 ns versus 1.8 µs), higher forward voltage (1.7 V @ 3 A versus 962 mV @ 2 A), and different package form factor (DO-214AB, SMC versus TO-277A, 3-PowerDFN). The operating temperature range is -40°C to 175°C, which is narrower at the lower bound compared to the main part (-55°C). All compliance certifications are equivalent: ROHS3 Compliant, MSL 1 (Unlimited), and REACH Unaffected. This substitute is suitable for applications where the faster recovery speed and higher current capacity are beneficial, provided the package footprint change and forward voltage characteristics are compatible with circuit design requirements. Current inventory availability is 17310 pieces.

All substitute parts maintain Active product status and are available from authorized distributors.

Frequently Asked Questions (FAQ)

Q: Can AS4PM-M3/86A be used as a direct replacement for AS4PM-M3/87A?

A: Yes. The AS4PM-M3/86A is a parametric equivalent with identical electrical specifications and package form factor. No circuit modification is required for direct substitution.

Q: What are the key differences between AS4PM-M3/87A and STTH310S?

A: The primary differences are: (1) Package form factor: AS4PM-M3/87A uses TO-277A (3-PowerDFN) while STTH310S uses SMC (DO-214AB); (2) Technology: AS4PM-M3/87A is Avalanche technology while STTH310S is Standard technology; (3) Reverse recovery time: AS4PM-M3/87A has 1.8 µs while STTH310S has 75 ns; (4) Forward voltage: AS4PM-M3/87A has 962 mV @ 2 A while STTH310S has 1.7 V @ 3 A; (5) Current rating: STTH310S is rated for 3 A versus 2.4 A; (6) Operating temperature minimum: STTH310S operates to -40°C while AS4PM-M3/87A operates to -55°C.

Q: Is the STTH310S suitable for applications requiring -55°C operation?

A: No. The STTH310S has a minimum operating temperature of -40°C, which does not meet the -55°C requirement of the AS4PM-M3/87A. Use AS4PM-M3/86A for applications requiring full -55°C to 175°C temperature range.

Q: Can STTH310S be used in place of AS4PM-M3/87A if the circuit board layout is different?

A: The STTH310S package form factor (SMC, DO-214AB) differs from the AS4PM-M3/87A package (TO-277A, 3-PowerDFN). Board layout and footprint modifications are required. Additionally, the higher forward voltage (1.7 V @ 3 A) and faster recovery time (75 ns) may affect circuit performance and require design verification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both AS4PM-M3/86A and STTH310S are ROHS3 Compliant with MSL 1 (Unlimited) moisture sensitivity rating and REACH Unaffected status.

Q: What is the difference between Avalanche and Standard technology in these diodes?

A: The AS4PM-M3/87A and AS4PM-M3/86A use Avalanche technology, while STTH310S uses Standard technology. Avalanche diodes are designed to operate in reverse bias avalanche breakdown mode. Standard rectifier diodes are general-purpose rectifiers. The choice between these technologies depends on specific application requirements for reverse voltage protection and recovery characteristics.

Q: Which substitute part has the fastest recovery time?

A: The STTH310S has the fastest reverse recovery time at 75 ns, compared to 1.8 µs for both AS4PM-M3/87A and AS4PM-M3/86A. Faster recovery time reduces switching losses in high-frequency applications.

Q: Can I use STTH310S in a circuit designed for AS4PM-M3/87A without any modifications?

A: No. The STTH310S differs in package form factor, forward voltage characteristics, recovery speed, and minimum operating temperature. Circuit verification is required before substitution.

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