AS3PD-M3/86A Equivalent & Substitute Parts

Part Overview

The AS3PD-M3/86A 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 to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when alternative electrical characteristics better suit specific application requirements.

Substiute Parts

AS3PD-M3/86A

Vishay General Semiconductor - Diodes DivisionIn Stock: 778AS3PD-M3/86A Datasheet

Current PartRFQ

STTH3R02S

STMicroelectronicsIn Stock: 10149STTH3R02S Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AS3PD-M3/86A is determined by electrical and mechanical compatibility across the following critical parameters:

Voltage Rating Compatibility: The substitute part must maintain a DC reverse voltage rating (Vr) of 200 V or greater to ensure safe operation within 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 design load without thermal stress or performance degradation.

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 standards.

Recovery Characteristics: The substitute part technology classification (avalanche versus standard recovery) may differ, provided the reverse recovery time (trr) and forward voltage characteristics remain within acceptable operating margins for the target application.

The STTH3R02S from STMicroelectronics meets these substitution criteria with equivalent voltage rating, higher current capacity, and compatible surface mount packaging in the SMC (DO-214AB) form factor.

Parameter Comparison

Engineering Selection Recommendations

AS3PD-M3/86A Selection Criteria:

The AS3PD-M3/86A is the primary component choice when avalanche diode technology is explicitly required by circuit design specifications. This part maintains active production status with confirmed inventory availability (722 pcs in stock). The component is fully RoHS3 compliant and REACH unaffected, satisfying regulatory requirements for commercial and industrial applications. The eSMP® series designation indicates optimized thermal performance for power dissipation applications. The standard recovery speed classification (>500 ns) and 1.2 µs reverse recovery time are suitable for moderate-frequency rectification circuits.

STTH3R02S Selection Criteria:

The STTH3R02S serves as a functional substitute when standard recovery diode technology is acceptable and higher current capacity is beneficial. This part offers superior reverse recovery characteristics (30 ns versus 1.2 µs), making it suitable for higher-frequency switching applications. The 3 A current rating provides 43% additional capacity margin over the AS3PD-M3/86A, supporting thermal margin in continuous operation. The STTH3R02S maintains identical 200 V voltage rating and maximum junction temperature (175°C), with RoHS3 compliance and REACH unaffected status. Inventory availability is significantly higher (10,076 pcs), supporting supply chain continuity. The SMC package (DO-214AB) differs from the TO-277A form factor and requires PCB layout modification.

Both parts are active products with equivalent regulatory compliance. Selection between them depends on technology requirements (avalanche versus standard recovery), package compatibility with existing PCB designs, and application frequency characteristics.

Frequently Asked Questions (FAQ)

Q: Can the STTH3R02S directly replace the AS3PD-M3/86A without PCB modification?

A: No. The STTH3R02S uses the SMC (DO-214AB) package, while the AS3PD-M3/86A uses the TO-277A (SMPC) package. These packages have different footprints and pin configurations. PCB layout modification is required, including pad pattern redesign and trace routing adjustments.

Q: What is the primary electrical difference between these two diodes?

A: The AS3PD-M3/86A is an avalanche diode with 1.2 µs reverse recovery time, while the STTH3R02S is a standard recovery diode with 30 ns reverse recovery time. The STTH3R02S exhibits significantly faster switching characteristics, making it more suitable for high-frequency applications. Both maintain identical 200 V voltage rating.

Q: Is the STTH3R02S suitable for all applications where the AS3PD-M3/86A is used?

A: The STTH3R02S is electrically compatible for applications where standard recovery diode performance is acceptable. However, circuits specifically designed for avalanche diode characteristics or requiring the slower recovery time of the AS3PD-M3/86A may require circuit re-evaluation. The higher current rating (3 A versus 2.1 A) provides additional thermal margin in most applications.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the AS3PD-M3/86A and STTH3R02S are RoHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for commercial, industrial, and consumer applications.

Q: What is the impact of the different reverse recovery times on circuit performance?

A: The STTH3R02S reverse recovery time (30 ns) is 40 times faster than the AS3PD-M3/86A (1.2 µs). In high-frequency switching circuits, faster recovery reduces switching losses and electromagnetic interference. In low-frequency rectification circuits, this difference has minimal impact on performance.

Q: Which part should be selected for new designs?

A: For new designs, the STTH3R02S is recommended when standard recovery diode performance is acceptable, due to superior reverse recovery characteristics, higher current capacity, and significantly higher inventory availability. The AS3PD-M3/86A should be selected only when avalanche diode technology is a specific design requirement.

Q: Are there any thermal considerations when substituting these parts?

A: Both parts have identical maximum junction temperature (175°C). The STTH3R02S, with 3 A capacity versus 2.1 A, provides better thermal margin under continuous operation. Forward voltage characteristics differ slightly (920 mV @ 1.5 A for AS3PD-M3/86A versus 1 V @ 3 A for STTH3R02S), affecting power dissipation calculations in specific current ranges.