Equivalent & Substitute Parts for Microchip Technology S3820

Part Overview

The Microchip Technology S3820 is a general-purpose rectifier diode rated for 200 V DC reverse voltage and 100 A average rectified current in a stud mount DO-5 package. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance parameters are required but the primary part is unavailable, or when application-specific constraints necessitate alternative component selection within the same functional category.

Substiute Parts

S3820

Microchip TechnologyIn Stock: 984S3820 Datasheet

Current PartRFQ

VS-40HF20

Vishay General Semiconductor - Diodes DivisionIn Stock: 1265VS-40HF20 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the Microchip Technology S3820 is determined by the following critical electrical and mechanical parameters:

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

Current Rating Consideration: While the S3820 is rated for 100 A average rectified current, substitute parts with lower current ratings (such as 40 A) may be selected only when the application circuit operates at reduced current levels below the substitute part's maximum rating.

Package and Mounting: Both the main part and substitute must use compatible stud mount configurations within the DO-5 or DO-203AB package family to ensure mechanical and thermal interface compatibility.

Recovery Speed: Standard recovery characteristics (>500 ns, >200 mA) must be maintained to preserve circuit switching behavior.

Temperature Range: Operating junction temperature range must support the application's thermal environment.

Compliance Status: RoHS3 compliance and REACH unaffected status must be maintained for regulatory alignment.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection: The Microchip Technology S3820 is the specified component for applications requiring 100 A average rectified current at 200 V reverse voltage with stud mount packaging. This part maintains Active product status and full ROHS3 compliance.

Substitute Part Application: The Vishay General Semiconductor VS-40HF20 is a valid substitute only in applications where the circuit operates at average rectified currents of 40 A or below. This substitute maintains voltage rating equivalence, package compatibility, and regulatory compliance (ROHS3, REACH Unaffected).

Operational Constraints for Substitution: When using the VS-40HF20 as a substitute, the following conditions apply:

• Circuit average rectified current must not exceed 40 A
• Forward voltage drop increase (1.3 V versus 1.15 V) results in higher power dissipation and thermal load
• Reverse leakage current is higher (9 mA versus 25 µA), affecting circuit standby power consumption
• Maximum junction temperature is 190°C versus 200°C for the primary part
• Both parts maintain standard recovery speed and stud mount mechanical compatibility

Compliance Verification: Both parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements for equivalent substitution in compliant applications.

Frequently Asked Questions (FAQ)

Q: Can the VS-40HF20 directly replace the S3820 in all applications?

A: No. The VS-40HF20 is rated for 40 A average rectified current, while the S3820 is rated for 100 A. Direct substitution is valid only when the application circuit operates at 40 A or below. Exceeding this current rating on the substitute part violates component specifications.

Q: What is the impact of the higher forward voltage in the VS-40HF20?

A: The VS-40HF20 exhibits a forward voltage of 1.3 V at 125 A compared to 1.15 V at 200 A for the S3820. This 0.15 V difference increases power dissipation in the diode, resulting in higher thermal load. Thermal management design must account for this increased dissipation.

Q: Are the package dimensions identical between S3820 and VS-40HF20?

A: Both parts use DO-203AB (DO-5) stud mount packaging. Mechanical and thermal interface compatibility is maintained. Mounting hole patterns and stud dimensions are compatible within the DO-5 standard.

Q: Does the higher reverse leakage current of the VS-40HF20 affect circuit performance?

A: The VS-40HF20 exhibits 9 mA reverse leakage at 200 V compared to 25 µA for the S3820. This 360-fold increase in leakage current affects standby power consumption and may impact circuits with high impedance paths or sensitive bias networks. Circuit analysis is required to determine acceptability.

Q: Are both parts suitable for high-temperature applications?

A: The S3820 operates to 200°C junction temperature, while the VS-40HF20 operates to 190°C. For applications approaching 190°C, the VS-40HF20 reaches its maximum rating. The S3820 provides 10°C additional thermal margin.

Q: What is the recovery speed classification for both parts?

A: Both the S3820 and VS-40HF20 are classified as standard recovery diodes with recovery time greater than 500 ns at currents exceeding 200 mA. This characteristic is identical between both parts and does not affect substitution compatibility.

Q: Are there any regulatory differences between the two parts?

A: No. Both parts are ROHS3 compliant and REACH unaffected. Regulatory compliance is equivalent, and substitution does not introduce compliance risk in regulated applications.