IRD3901 Equivalent & Substitute Parts Reference

Part Overview

The IRD3901, manufactured by Vishay General Semiconductor – Diodes Division, is a general-purpose, fast recovery rectifier diode rated at 200 V and 20A, designed for chassis, stud mount (DO-203AB/DO-5) applications. This diode is now classified as obsolete, making it necessary to identify suitable alternative models within the same electrical, mechanical, and packaging specifications to ensure continued design support and provide immediate replacement options in assemblies and maintenance.

Substiute Parts

IRD3901

Vishay General Semiconductor - Diodes DivisionIn Stock: 1215IRD3901 Datasheet

Current PartRFQ

1N3901

Microchip TechnologyIn Stock: 11121N3901 Datasheet

MFR RecommendedRFQ

1N3911

Microchip TechnologyIn Stock: 8381N3911 Datasheet

MFR RecommendedRFQ

1N3911A

Microchip TechnologyIn Stock: 7911N3911A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts are identified strictly on the basis of matched or superior electrical ratings, identical mechanical package (DO-203AB/DO-5, stud mount), functional category (diodes, rectifiers), and comparable or better performance in essential parameters. The key substitution criteria applied are:

• Voltage - DC Reverse (Vr) (Max): 200 V
• Current - Average Rectified (Io): ≥20A
• Speed: Fast Recovery (≤500ns, ≥200mA)
• Package / Case: DO-203AB (DO-5), Stud Mount
• Reverse Recovery Time (trr): ≤350 ns
• Current - Reverse Leakage @ Vr: ≤50 µA @ 200 V

Parameter Comparison

Engineering Selection Recommendations

The IRD3901 is obsolete. Substitute parts 1N3901, 1N3911, and 1N3911A are current production with matching or better electrical parameters, identical case and mounting, and REACH unaffected status. IRD3901 is ROHS3 compliant; substitute parts 1N3901 and 1N3911A are listed as RoHS non-compliant or without RoHS designation. For applications where RoHS compliance is a requirement, review compliance status of each substitute. All listed substitutes match the original part in fundamental operational specifications and packaging.

Frequently Asked Questions (FAQ)

Q1: How are substitute rectifier diodes selected?
Selection is strictly based on matching or exceeding the original part’s voltage rating, average current rating, reverse recovery time, mounting style, and package type.

Q2: Will these substitute parts fit physically in the same mechanical space?
All substitutes are in the same package (DO-203AB, DO-5) and use a stud mount, assuring mechanical compatibility with IRD3901.

Q3: What should be considered regarding compliance and certifications?
The IRD3901 is ROHS3 compliant; substitutes vary in RoHS compliance status. For regulated environments, verify the part's RoHS and REACH status.

Q4: Are substitute parts suitable for the same operating temperature range?
Substitutes specify an operating temperature junction range of -65°C to 150°C, which encompasses and exceeds the IRD3901 range of -40°C to 125°C.

Q5: Is reverse recovery time consistent among substitutes?
All substitutes feature fast recovery times between 150 ns and 200 ns, which are within or superior to the IRD3901's 350 ns specification.

Q6: Is there any difference in current or voltage ratings among substitutes?
All substitute diodes meet or exceed the required 200 V/20A ratings. Some substitutes provide higher current handling (30A, 50A).