IRD3900 Equivalent & Substitute Parts

Part Overview

The IRD3900 is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 100 V DC reverse voltage and 20 A average rectified current in a DO-203AB (DO-5) stud mount package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing applications and new designs. Substitute parts are selected based on matching or exceeding electrical specifications while maintaining mechanical compatibility with the DO-203AB stud mount configuration.

Substiute Parts

IRD3900

Vishay General Semiconductor - Diodes DivisionIn Stock: 1212IRD3900 Datasheet

Current PartRFQ

VS-40HFL10S02

Vishay General Semiconductor - Diodes DivisionIn Stock: 773VS-40HFL10S02 Datasheet

DirectRFQ

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

Substitute parts for the IRD3900 are qualified based on the following criteria:

Mandatory Compatibility Parameters:

• Voltage - DC Reverse (Vr) (Max): 100 V minimum
• Package / Case: DO-203AB, DO-5, Stud mount configuration
• Mounting Type: Stud Mount
• Technology: Standard rectifier diode

Current Rating Consideration: Substitute parts are grouped into two categories based on average rectified current (Io):

1. Direct Current Rating Match (20 A): Parts with Io = 20 A provide equivalent current handling capacity.
2. Elevated Current Rating (40 A, 50 A): Parts with higher Io ratings exceed the original specification and are suitable for applications requiring increased current capacity while maintaining the same voltage and package specifications.

Performance Parameters: All substitute parts maintain fast recovery characteristics (≤ 500ns, > 200mA) and operate within the standard rectifier diode technology classification. Reverse recovery time (trr) and reverse leakage current are secondary selection criteria when multiple parts meet primary requirements.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Equivalent Current Rating):

The 1N3900 manufactured by Microchip Technology provides electrical equivalence to the IRD3900 with identical voltage and current ratings (100 V, 20 A). This part is in active product status and maintains the same DO-203AB stud mount package. The 1N3900 offers improved reverse recovery time (200 ns versus 350 ns) and identical reverse leakage current (50 µA @ 100 V). However, the 1N3900 is RoHS non-compliant, which may impact applications subject to RoHS compliance requirements.

For Elevated Current Capacity:

The 1N3910 and 1N3910A, both manufactured by Microchip Technology, provide 50 A average rectified current while maintaining 100 V reverse voltage and DO-203AB stud mount configuration. These parts are suitable for applications requiring increased current handling beyond the original 20 A specification. Both parts feature improved reverse recovery time (200 ns) and significantly lower reverse leakage current (15 µA @ 100 V). Like the 1N3900, these parts are RoHS non-compliant.

For RoHS3 Compliance Maintenance:

The VS-40HFL10S02 manufactured by Vishay General Semiconductor - Diodes Division maintains ROHS3 compliance while providing 40 A average rectified current at 100 V reverse voltage in the DO-203AB stud mount package. This part is in active product status and is suitable for applications requiring compliance with RoHS3 standards. The VS-40HFL10S02 features improved reverse recovery time (200 ns) but exhibits higher reverse leakage current (100 µA @ 100 V) and higher forward voltage drop (1.95 V @ 40 A) compared to the original IRD3900.

Product Status Consideration:

All substitute parts listed are in active product status, ensuring ongoing availability and manufacturing support. The IRD3900 is obsolete and should not be specified for new designs.

Frequently Asked Questions (FAQ)

Q: Can the 1N3900 be used as a direct replacement for the IRD3900?

A: The 1N3900 is electrically equivalent to the IRD3900, with matching 100 V reverse voltage and 20 A average rectified current ratings. Both parts use the DO-203AB stud mount package. The 1N3900 is in active product status, whereas the IRD3900 is obsolete. However, the 1N3900 is RoHS non-compliant, which may be a consideration for applications subject to RoHS compliance requirements.

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

A: The 1N3910 and 1N3910A are electrically identical, both rated for 100 V reverse voltage and 50 A average rectified current in the DO-203AB stud mount package. Both parts feature 200 ns reverse recovery time and 15 µA reverse leakage current @ 100 V. The parts are functionally interchangeable for applications requiring 50 A current capacity.

Q: Why does the VS-40HFL10S02 have higher reverse leakage current than the IRD3900?

A: The VS-40HFL10S02 is rated for 40 A average rectified current compared to the IRD3900's 20 A rating. Higher current capacity in rectifier diodes typically results in increased reverse leakage current as a characteristic of the semiconductor design. The 100 µA @ 100 V leakage current of the VS-40HFL10S02 remains within acceptable limits for standard rectifier diode applications.

Q: Can I use a 50 A rated diode (1N3910 or 1N3910A) in an application designed for 20 A?

A: Yes. The 1N3910 and 1N3910A are rated for 50 A average rectified current, which exceeds the 20 A requirement of the original IRD3900. Using a higher-rated diode in a lower-current application does not create a compatibility issue. The diode will operate within its safe operating region. However, verify that the forward voltage drop (1.4 V @ 50 A) and reverse leakage current (15 µA @ 100 V) are acceptable for the specific circuit design.

Q: Are all substitute parts compatible with the same mounting hardware as the IRD3900?

A: All substitute parts listed use the DO-203AB (DO-5) stud mount package, which is mechanically compatible with the IRD3900. The stud mount configuration allows direct mechanical substitution without modification to mounting hardware or chassis design.

Q: Which substitute part should I select if RoHS3 compliance is required?

A: The VS-40HFL10S02 is the only substitute part listed with ROHS3 compliance. This part is rated for 40 A average rectified current at 100 V reverse voltage and maintains the DO-203AB stud mount package. If RoHS3 compliance is mandatory, the VS-40HFL10S02 is the appropriate selection.

Q: What is the operating temperature range difference between the IRD3900 and substitute parts?

A: The IRD3900 operates from -40°C to 125°C junction temperature. The Microchip 1N3900, 1N3910, and 1N3910A parts operate from -65°C to 150°C, providing extended temperature range capability. The VS-40HFL10S02 operates from -40°C to 125°C, matching the original IRD3900 temperature range. Select the appropriate part based on the application's thermal requirements.