AR4PD-M3/86A Equivalent & Substitute Parts

Part Overview

The AR4PD-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 a 2 A average rectified current capacity and features fast recovery characteristics with a reverse recovery time of 140 ns. The device is housed in a TO-277A (SMPC) package and is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Identification of equivalent and substitute parts becomes necessary when the primary component experiences supply constraints, extended lead times, or when design requirements permit operation with alternative specifications that maintain functional compatibility within the application circuit.

Substiute Parts

AR4PD-M3/86A

Vishay General Semiconductor - Diodes DivisionIn Stock: 1231AR4PD-M3/86A Datasheet

Current PartRFQ

STTH4R02S

STMicroelectronicsIn Stock: 17612STTH4R02S Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AR4PD-M3/86A is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - DC Reverse (Vr) rating must equal or exceed 200 V
• Current - Average Rectified (Io) rating must equal or exceed 2 A
• Speed classification must maintain Fast Recovery characteristics (≤ 500ns, > 200mA)
• Operating temperature range must encompass the application requirements

Mechanical Compatibility Criteria:

• Surface mount package configuration
• Physical footprint and pin configuration compatibility with PCB layout

Compliance Requirements:

• RoHS3 compliance status
• MSL rating of 1 (Unlimited) for handling and storage

The STTH4R02S from STMicroelectronics meets these substitution criteria with equivalent reverse voltage rating (200 V), higher current capacity (4 A versus 2 A), fast recovery speed classification, and identical compliance certifications. The primary distinction is the package format (SMC versus TO-277A), which requires PCB layout verification for physical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: AR4PD-M3/86A

The AR4PD-M3/86A remains the specified component when the TO-277A (SMPC) package footprint is required for PCB layout compatibility and when the 2 A current rating is sufficient for the application circuit. This part maintains active production status with established supply channels and is fully compliant with RoHS3 and REACH requirements.

Substitute Part: STTH4R02S

The STTH4R02S is a valid substitute when the following conditions are met:

1. The PCB layout accommodates the SMC (DO-214AB) package footprint in place of the TO-277A package
2. The application circuit can utilize the higher 4 A current rating without adverse effects
3. The lower forward voltage drop (1.05 V versus 1.6 V at 4 A) and faster reverse recovery time (30 ns versus 140 ns) are compatible with circuit performance requirements
4. The SMC package thermal characteristics are acceptable for the thermal management design

Both parts maintain identical compliance certifications (RoHS3, REACH Unaffected, MSL 1) and equivalent reverse voltage ratings (200 V), ensuring regulatory and handling compatibility.

Frequently Asked Questions (FAQ)

Q: Can the STTH4R02S directly replace the AR4PD-M3/86A without PCB modification?

A: No. The STTH4R02S uses an SMC (DO-214AB) package while the AR4PD-M3/86A uses a TO-277A (SMPC) package. These packages have different physical dimensions and pin configurations. PCB layout modification is required to accommodate the substitute part.

Q: What are the electrical advantages of the STTH4R02S substitute?

A: The STTH4R02S provides a lower forward voltage drop (1.05 V versus 1.6 V at 4 A), resulting in reduced power dissipation. The reverse recovery time is significantly faster (30 ns versus 140 ns), which improves switching performance in high-frequency applications. The current rating is doubled (4 A versus 2 A), providing additional design margin.

Q: Are there any electrical disadvantages when using the STTH4R02S?

A: The STTH4R02S exhibits lower reverse leakage current (3 µA versus 10 µA at 200 V), which is an improvement. No electrical disadvantages exist; the substitute part provides equal or superior electrical performance within the specified parameters.

Q: Do both parts have identical compliance certifications?

A: Yes. Both the AR4PD-M3/86A and STTH4R02S are RoHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings. Both are classified under the same HTSUS code (8541.10.0080) and ECCN (EAR99).

Q: What is the primary consideration when selecting between these parts?

A: The package format is the primary selection criterion. If the PCB layout is designed for the TO-277A footprint, the AR4PD-M3/86A must be used. If the PCB layout accommodates the SMC footprint or can be modified, the STTH4R02S is a valid substitute with improved electrical performance characteristics.

Q: Can the AR4PD-M3/86A be used in applications designed for the STTH4R02S?

A: Yes, provided the application circuit does not require the higher current capacity (4 A) of the STTH4R02S. The AR4PD-M3/86A meets the minimum electrical requirements (200 V reverse voltage, fast recovery speed) and maintains identical compliance certifications. PCB layout compatibility with the TO-277A package must be verified.