AS3PD-M3/87A Equivalent & Substitute Parts

Part Overview

The AS3PD-M3/87A is an avalanche diode manufactured by Vishay General Semiconductor - Diodes Division, classified within the eSMP® series of surface mount rectifiers. This component is rated for 200 V DC reverse voltage with an average rectified current of 2.1 A and is packaged in the TO-277A (SMPC) configuration. The device is currently in active production status and is RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching or exceeding the electrical performance parameters and maintaining compatible surface mount packaging standards.

Substiute Parts

AS3PD-M3/87A

Vishay General Semiconductor - Diodes DivisionIn Stock: 1062AS3PD-M3/87A Datasheet

Current PartRFQ

STTH3R02S

STMicroelectronicsIn Stock: 10149STTH3R02S Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AS3PD-M3/87A is determined by the following critical electrical and mechanical parameters:

Voltage Rating Compatibility: The substitute part must maintain a DC reverse voltage rating (Vr) of 200 V or greater to ensure safe operation in the same circuit topology.

Current Rating Compatibility: The substitute part must support an average rectified current (Io) equal to or exceeding 2.1 A to handle the same load conditions without thermal stress.

Package and Mounting Compatibility: The substitute part must be surface mount technology (SMT) to maintain compatibility with automated assembly processes and PCB layout requirements.

Regulatory and Compliance Alignment: The substitute part must maintain RoHS3 compliance and REACH unaffected status to satisfy procurement and environmental requirements.

Recovery Characteristics: The substitute part may operate with different recovery speed classifications (standard or fast recovery) provided the reverse recovery time (trr) does not introduce unacceptable switching losses in the target application.

The STTH3R02S meets all substitution criteria through equivalent voltage rating, superior current rating (3 A vs. 2.1 A), surface mount packaging in SMC configuration, and matching regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitution: The STTH3R02S is qualified as a direct electrical substitute for the AS3PD-M3/87A based on matching voltage ratings (200 V), exceeding current capacity (3 A vs. 2.1 A), and maintaining identical regulatory compliance (RoHS3, REACH unaffected). Both devices operate across the same maximum junction temperature range (-55°C to 175°C).

Package Consideration: The STTH3R02S utilizes a DO-214AB (SMC) package footprint, which differs from the TO-277 (3-PowerDFN) package of the main part. PCB layout and thermal management designs must be re-evaluated to accommodate the different package geometry and thermal characteristics.

Performance Enhancement: The STTH3R02S provides improved reverse recovery time (30 ns vs. 1.2 µs) and lower reverse leakage current (3 µA vs. 10 µA), resulting in reduced switching losses and improved efficiency in high-frequency applications.

Inventory and Availability: The STTH3R02S maintains higher stock levels (10,076 pcs) compared to the AS3PD-M3/87A (1,004 pcs), supporting supply chain continuity and lead time reduction.

Frequently Asked Questions (FAQ)

Q: Can the STTH3R02S directly replace the AS3PD-M3/87A without circuit modification?

A: Electrical substitution is valid based on voltage and current ratings. However, the different package footprint (DO-214AB vs. TO-277) requires PCB layout redesign. Thermal management characteristics may differ due to package geometry variations.

Q: What is the significance of the faster reverse recovery time in the STTH3R02S?

A: The STTH3R02S exhibits a reverse recovery time of 30 ns compared to 1.2 µs in the AS3PD-M3/87A. This faster recovery reduces switching losses and electromagnetic interference in rectification circuits, particularly beneficial in high-frequency power conversion applications.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both the AS3PD-M3/87A and STTH3R02S support a maximum junction temperature of 175°C and minimum operating temperature of -55°C, ensuring thermal compatibility across the specified operating envelope.

Q: Does the higher current rating of the STTH3R02S (3 A vs. 2.1 A) affect circuit performance?

A: The higher current rating of the STTH3R02S provides additional thermal margin and allows operation at higher current levels without exceeding device ratings. In applications requiring only 2.1 A, the substitute operates with reduced stress and improved reliability.

Q: What compliance certifications apply to both parts?

A: Both the AS3PD-M3/87A and STTH3R02S are RoHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.10.0080. Moisture sensitivity level is MSL 1 (unlimited) for both devices.

Q: How do the reverse leakage currents compare between the two parts?

A: The STTH3R02S exhibits lower reverse leakage current (3 µA @ 200 V) compared to the AS3PD-M3/87A (10 µA @ 200 V). Lower leakage reduces standby power consumption and improves circuit efficiency in applications with extended idle periods.

Q: What packaging formats are available for the STTH3R02S?

A: The STTH3R02S is supplied in Cut Tape (CT) and Digi-Reel® packaging formats, differing from the Tape & Reel (TR) packaging of the AS3PD-M3/87A. Packaging selection depends on assembly process requirements and volume specifications.