IRD3910 Equivalent & Substitute Parts

Part Overview

The IRD3910 is a general-purpose fast recovery rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 100 V reverse voltage and 30 A average rectified current in a DO-203AB (DO-5) stud mount package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain electrical compatibility within the specified voltage and current parameters while accommodating the stud mount mechanical interface.

Substiute Parts

IRD3910

Vishay General Semiconductor - Diodes DivisionIn Stock: 1183IRD3910 Datasheet

Current PartRFQ

1N3900

Microchip TechnologyIn Stock: 10901N3900 Datasheet

MFR RecommendedRFQ

1N3910

Microchip TechnologyIn Stock: 16461N3910 Datasheet

MFR RecommendedRFQ

1N3910A

Microchip TechnologyIn Stock: 11931N3910A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRD3910 is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a minimum DC reverse voltage rating of 100 V to ensure safe operation in the original circuit application.

Current Rating: Substitute parts are grouped by average rectified current capacity. The IRD3910 specifies 30 A; substitutes with equal or higher current ratings (20 A, 50 A) are electrically compatible, as they can safely handle the original design current without exceeding thermal or electrical limits.

Package and Mounting: All substitute parts must use the DO-203AB (DO-5) stud mount package to ensure mechanical compatibility with existing circuit board layouts and thermal management designs.

Speed Classification: All substitute parts maintain fast recovery characteristics (≤ 500ns, > 200mA), ensuring compatibility with switching applications and transient response requirements.

Forward Voltage: Substitute parts with forward voltage ratings of 1.4 V @ 50-63 A are compatible with the original 1.8 V @ 62.8 A specification, as lower forward voltage reduces power dissipation and improves efficiency.

Parameter Comparison

Engineering Selection Recommendations

1N3910 and 1N3910A (Microchip Technology)

The 1N3910 and 1N3910A are direct functional equivalents to the IRD3910, both rated for 100 V reverse voltage and 50 A average rectified current. These parts exceed the original 30 A current requirement, providing design margin and thermal headroom. Both devices are in active production status, ensuring long-term availability and supply chain stability. The 200 ns reverse recovery time is superior to the original 350 ns specification, reducing switching losses in high-frequency applications. Operating temperature range extends to 150°C, supporting higher ambient and junction temperature environments compared to the original -40 to 125°C range. These parts are suitable for direct replacement in applications where current capacity and thermal performance are not constrained.

1N3900 (Microchip Technology)

The 1N3900 is a substitute part rated for 100 V reverse voltage and 20 A average rectified current. This part is suitable for applications where the original 30 A current requirement can be reduced or where circuit design permits lower current capacity. The 1N3900 maintains fast recovery characteristics and is in active production. However, the 20 A rating is below the original 30 A specification and should be selected only when circuit analysis confirms that peak and average current demands do not exceed this limit. The 200 ns reverse recovery time and extended operating temperature range (-65 to 150°C) provide performance advantages over the original part.

Compliance and Regulatory Status

All substitute parts are REACH Unaffected and classified under ECCN EAR99. The IRD3910 is RoHS3 Compliant; substitute parts from Microchip Technology are RoHS non-compliant. Design teams must evaluate RoHS compliance requirements for their specific applications and regional markets before selecting substitute parts.

Frequently Asked Questions (FAQ)

Q: Can the 1N3900 (20 A) be used as a direct replacement for the IRD3910 (30 A)?

A: The 1N3900 is electrically compatible with the IRD3910 in terms of voltage rating (100 V) and package (DO-203AB stud mount). However, the 20 A current rating is below the original 30 A specification. Substitution is permissible only when circuit analysis confirms that the application's peak and average current demands do not exceed 20 A. If the circuit requires the full 30 A capacity, the 1N3900 is not suitable.

Q: What is the difference between 1N3910 and 1N3910A?

A: Both the 1N3910 and 1N3910A are rated for 100 V reverse voltage and 50 A average rectified current with identical electrical specifications. Both are manufactured by Microchip Technology in the DO-203AB (DO-5) stud mount package. The designations represent different product lines or manufacturing batches within the same electrical specification class. Either part is suitable for replacement of the IRD3910.

Q: Why does the IRD3910 have a higher reverse recovery time (350 ns) compared to substitute parts (200 ns)?

A: The IRD3910 is an obsolete part manufactured by Vishay using older semiconductor technology. Substitute parts from Microchip Technology incorporate modern fast recovery diode technology, resulting in faster reverse recovery times. The 200 ns recovery time in substitute parts reduces switching losses and improves efficiency in high-frequency rectification circuits. This is a performance advantage, not a compatibility issue.

Q: Are all substitute parts available in the same stud mount package?

A: Yes. The IRD3910 and all substitute parts (1N3900, 1N3910, 1N3910A) use the DO-203AB (DO-5) stud mount package. Mechanical compatibility with existing circuit board layouts, heat sinks, and thermal management designs is maintained across all parts.

Q: What is the impact of RoHS compliance differences between the IRD3910 and substitute parts?

A: The IRD3910 is RoHS3 Compliant, while substitute parts from Microchip Technology are RoHS non-compliant. RoHS compliance is a regulatory requirement in specific markets and applications. Design teams must verify RoHS requirements for their target markets and applications before selecting substitute parts. If RoHS compliance is mandatory, alternative suppliers or part families may be required.

Q: Can substitute parts handle the same thermal load as the IRD3910?

A: Substitute parts with 50 A ratings (1N3910, 1N3910A) exceed the original 30 A specification and provide greater thermal capacity. The 1N3900 (20 A) has lower thermal capacity than the original part. All substitute parts maintain the DO-203AB stud mount package, which supports the same thermal interface and heat sink mounting. Forward voltage characteristics (1.4 V vs. 1.8 V) in substitute parts result in lower power dissipation, reducing thermal load compared to the original IRD3910.

Q: What is the operating temperature range difference, and does it affect substitution?

A: The IRD3910 operates from -40 to 125°C junction temperature. Substitute parts operate from -65 to 150°C. The extended range in substitute parts supports wider ambient and junction temperature environments. This is a performance advantage and does not restrict substitution. Applications operating within the original -40 to 125°C range are fully compatible with substitute parts.