AS3PM-M3/87A Equivalent & Substitute Parts

Part Overview

The AS3PM-M3/87A is an avalanche diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 1000 V DC reverse voltage with 2.1 A average rectified current. This component operates in the eSMP® series and is designed for surface mount applications in the TO-277A (SMPC) package. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified based on matching or exceeding the electrical performance parameters while maintaining compatibility with surface mount assembly processes. Substitution becomes necessary when the primary part reaches end-of-life status, experiences supply constraints, or when design requirements permit higher performance specifications.

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
Operating Temperature - Junction	-55 to 175	°C
Mounting Type	Surface Mount	-
Package / Case	TO-277, 3-PowerDFN	-
Technology	Avalanche	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the AS3PM-M3/87A is determined by the following critical electrical and mechanical parameters:

Voltage Rating: The substitute part must maintain a minimum DC reverse voltage rating of 1000 V to ensure equivalent circuit protection and reliability in the intended application.

Current Rating: The substitute part must support a minimum average rectified current of 2.1 A. Parts with higher current ratings (such as 3 A) are acceptable as they provide additional design margin without compromising circuit function.

Package Compatibility: The substitute part must be surface mount technology. While the AS3PM-M3/87A uses TO-277A (SMPC) packaging, substitute parts in alternative surface mount packages (such as SMC/DO-214AB) are acceptable provided they meet electrical specifications and can be integrated into the assembly process.

Recovery Characteristics: The substitute part must operate within standard or faster recovery speed classifications. The AS3PM-M3/87A specifies standard recovery (>500 ns); faster recovery times in substitute parts do not create incompatibility.

Compliance Requirements: All substitute parts must maintain RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1) to ensure regulatory and environmental compatibility.

Temperature Range: The substitute part must support the operating junction temperature range of -55°C to 175°C or a range that encompasses the primary application requirements.

Parameter Comparison

Parameter	AS3PM-M3/87A (Main)	STTH310S (Substitute)	Compatibility
Manufacturer	Vishay General Semiconductor	STMicroelectronics	Different manufacturer
Voltage - DC Reverse (Vr) (Max)	1000 V	1000 V	Equivalent
Current - Average Rectified (Io)	2.1 A	3 A	Substitute exceeds requirement
Voltage - Forward (Vf) (Max) @ If	920 mV @ 1.5 A	1.7 V @ 3 A	Different test conditions
Reverse Recovery Time (trr)	1.2 µs	75 ns	Substitute faster
Current - Reverse Leakage @ Vr	10 µA @ 1000 V	10 µA @ 1000 V	Equivalent
Operating Temperature - Junction	-55°C to 175°C	-40°C to 175°C	Substitute range narrower at low end
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	TO-277, 3-PowerDFN	DO-214AB, SMC	Different package form factor
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent
Product Status	Active	Active	Both in production

Engineering Selection Recommendations

Primary Part (AS3PM-M3/87A): This part remains the first choice for new designs and ongoing production. It is actively manufactured by Vishay, maintains full RoHS3 compliance, and carries unlimited moisture sensitivity rating. The avalanche technology and eSMP® series designation provide established reliability in high-voltage rectification applications.

Substitute Part (STTH310S): The STTH310S from STMicroelectronics is a qualified substitute when the primary part is unavailable or when design requirements permit higher current capacity. This part meets or exceeds all critical electrical parameters: equivalent 1000 V reverse voltage rating, higher 3 A current capacity, and faster reverse recovery time (75 ns versus 1.2 µs). Both parts maintain identical reverse leakage characteristics and RoHS3 compliance.

Package Consideration: The STTH310S uses SMC (DO-214AB) packaging instead of the TO-277A (SMPC) package of the primary part. This difference requires PCB layout modification and may affect thermal management characteristics. Assembly process compatibility must be verified before implementation.

Temperature Range: The STTH310S operating range begins at -40°C rather than -55°C. Applications requiring operation below -40°C junction temperature must retain the AS3PM-M3/87A.

Compliance Status: Both parts are ROHS3 compliant, REACH unaffected, and carry EAR99 export classification. No regulatory barriers exist for substitution in applicable markets.

Frequently Asked Questions (FAQ)

Q: Can the STTH310S directly replace the AS3PM-M3/87A without circuit modification?

A: Electrical substitution is valid based on voltage and current ratings. However, the different package form factor (SMC versus TO-277A) requires PCB layout changes. Thermal performance may differ due to package geometry variations. Circuit function remains compatible when electrical parameters are met.

Q: What is the significance of the faster reverse recovery time in the STTH310S?

A: The STTH310S reverse recovery time of 75 ns is significantly faster than the AS3PM-M3/87A at 1.2 µs. Faster recovery reduces switching losses and electromagnetic interference in high-frequency applications. This characteristic does not create incompatibility; it represents improved performance for the same voltage and current specifications.

Q: Does the higher current rating of the STTH310S (3 A versus 2.1 A) affect circuit design?

A: Higher current capacity provides additional design margin and thermal headroom. No circuit redesign is required. The part operates safely at the original 2.1 A specification with reduced stress on the component.

Q: Are there package compatibility issues when substituting the STTH310S?

A: Yes. The STTH310S uses SMC (DO-214AB) package geometry, while the AS3PM-M3/87A uses TO-277A (SMPC). These packages have different footprints, lead spacing, and thermal characteristics. PCB redesign is necessary. Thermal management analysis should be performed to ensure adequate heat dissipation in the new package configuration.

Q: What is the impact of the narrower temperature range in the STTH310S?

A: The STTH310S minimum junction temperature is -40°C compared to -55°C for the AS3PM-M3/87A. Applications operating below -40°C junction temperature cannot use the STTH310S. Applications within the -40°C to 175°C range experience no limitation.

Q: Are both parts suitable for high-voltage rectification in industrial applications?

A: Both parts are rated for 1000 V DC reverse voltage and carry active product status with full compliance certifications. Both are suitable for industrial high-voltage rectification. Selection depends on availability, package requirements, and specific temperature or recovery speed needs.

Q: What compliance certifications apply to both parts?

A: Both the AS3PM-M3/87A and STTH310S are RoHS3 compliant, REACH unaffected, and classified as EAR99 for export purposes. Both carry unlimited moisture sensitivity rating (MSL 1). No regulatory barriers exist for substitution in compliant applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message