IRD3911 Equivalent & Substitute Parts

Part Overview

The IRD3911 is a general-purpose fast recovery rectifier diode rated for 200 V DC reverse voltage and 30 A average rectified current in a DO-203AB (DO-5) stud mount package. Manufactured by Vishay General Semiconductor - Diodes Division, this component is classified as obsolete. Due to its obsolete product status, equivalent and substitute parts from active manufacturers are necessary for new designs, production continuity, and long-term component availability.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	200 V
Current - Average Rectified (Io)	30 A
Voltage - Forward (Vf) (Max)	1.8 V @ 62.8 A
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Reverse Recovery Time (trr)	350 ns
Current - Reverse Leakage @ Vr	80 µA @ 200 V
Mounting Type	Chassis, Stud Mount
Package / Case	DO-203AB, DO-5, Stud
Operating Temperature - Junction	-40°C ~ 125°C

Substitute Part Grouping Explanation

Substitution of the IRD3911 is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain the 200 V DC reverse voltage specification to ensure circuit protection and reliability.

Current Rating: The IRD3911 is rated for 30 A average rectified current. Substitute parts with equal or higher current ratings (30 A or greater) are electrically compatible for this application.

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

Speed Classification: All substitute parts must maintain fast recovery characteristics (≤ 500 ns) to preserve switching performance and minimize reverse recovery losses.

Reverse Recovery Time: The IRD3911 specifies 350 ns maximum reverse recovery time. Substitute parts with equal or faster recovery times are compatible.

The substitute parts identified—1N3901, 1N3911, and 1N3911A—all meet these core electrical and mechanical requirements while offering active product status from Microchip Technology.

Parameter Comparison

Parameter	IRD3911 (Vishay)	1N3901 (Microchip)	1N3911 (Microchip)	1N3911A (Microchip)
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	200 V	200 V
Current - Average Rectified (Io)	30 A	20 A	30 A	50 A
Voltage - Forward (Vf) (Max) @ If	1.8 V @ 62.8 A	1.4 V @ 63 A	1.4 V @ 50 A	1.4 V @ 50 A
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Reverse Recovery Time (trr)	350 ns	200 ns	200 ns	150 ns
Current - Reverse Leakage @ Vr	80 µA @ 200 V	50 µA @ 200 V	15 µA @ 200 V	15 µA @ 200 V
Mounting Type	Chassis, Stud Mount	Stud Mount	Stud Mount	Stud Mount
Package / Case	DO-203AB, DO-5, Stud	DO-203AB, DO-5, Stud	DO-203AB, DO-5, Stud	DO-203AB, DO-5, Stud
Operating Temperature - Junction	-40°C ~ 125°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

1N3911 (Microchip Technology) - Primary Equivalent

The 1N3911 is the direct functional equivalent to the IRD3911. Both parts share identical voltage (200 V) and current (30 A) ratings, the same DO-203AB (DO-5) stud mount package, and fast recovery characteristics. The 1N3911 is manufactured by Microchip Technology with active product status, ensuring long-term availability and supply chain continuity. This part is the preferred choice for direct replacement in existing designs.

1N3911A (Microchip Technology) - Higher Current Capacity Alternative

The 1N3911A maintains the 200 V voltage rating and DO-203AB (DO-5) package but provides increased current capacity at 50 A average rectified current compared to the IRD3911's 30 A rating. This part is suitable for applications requiring higher current handling or where design margin is desired. The 1N3911A exhibits superior reverse recovery time (150 ns) and lower reverse leakage current (15 µA @ 200 V), resulting in improved switching performance and reduced standby losses.

1N3901 (Microchip Technology) - Lower Current Capacity Alternative

The 1N3901 maintains the 200 V voltage rating and DO-203AB (DO-5) package but is rated for 20 A average rectified current. This part is suitable only for applications where the circuit current requirement does not exceed 20 A. The 1N3901 is not recommended as a substitute for the IRD3911 in circuits designed for 30 A operation.

All three substitute parts are manufactured by Microchip Technology with active product status, ensuring availability and technical support. All substitute parts are REACH Unaffected and classified under ECCN EAR99 and HTSUS 8541.10.0080.

Frequently Asked Questions (FAQ)

Q: Can the 1N3901 replace the IRD3911 in all applications?

A: No. The 1N3901 is rated for 20 A average rectified current, while the IRD3911 is rated for 30 A. The 1N3901 is suitable only for circuits designed for 20 A or lower current operation. Use of the 1N3901 in a 30 A circuit will result in component overstress and potential failure.

Q: Is the 1N3911 a direct replacement for the IRD3911?

A: Yes. The 1N3911 is a direct functional equivalent. Both parts share the same 200 V voltage rating, 30 A current rating, DO-203AB (DO-5) stud mount package, and fast recovery characteristics. The 1N3911 is the recommended substitute for new designs and production continuity.

Q: What are the advantages of using the 1N3911A instead of the 1N3911?

A: The 1N3911A provides higher current capacity (50 A versus 30 A), faster reverse recovery time (150 ns versus 200 ns), and lower reverse leakage current (15 µA versus 15 µA at 200 V). These characteristics result in improved thermal performance and reduced switching losses. The 1N3911A is suitable for applications requiring higher current handling or enhanced performance margins.

Q: Are all substitute parts compatible with the existing DO-203AB (DO-5) stud mount footprint?

A: Yes. All substitute parts—1N3901, 1N3911, and 1N3911A—use the DO-203AB (DO-5) stud mount package, ensuring mechanical and thermal compatibility with existing circuit board layouts and mounting hardware.

Q: What is the difference in reverse recovery time between the IRD3911 and the substitute parts?

A: The IRD3911 specifies 350 ns maximum reverse recovery time. The 1N3901 and 1N3911 both specify 200 ns, while the 1N3911A specifies 150 ns. All substitute parts exhibit faster or equal reverse recovery performance, resulting in reduced switching losses and improved circuit efficiency.

Q: Are the substitute parts RoHS compliant?

A: The 1N3911 and 1N3911A are RoHS non-compliant. The 1N3901 is also RoHS non-compliant. All substitute parts are REACH Unaffected. Compliance requirements should be verified against specific application and regulatory standards.

Q: What is the operating temperature range for the substitute parts?

A: The 1N3901, 1N3911, and 1N3911A all operate over a junction temperature range of -65°C to 150°C, which is wider than the IRD3911's -40°C to 125°C range. This extended temperature range provides additional design flexibility for applications operating in extreme thermal environments.

Q: Can the IRD3911 be used interchangeably with the 1N3911 in existing circuits?

A: Yes, within the constraints of component availability. The IRD3911 is obsolete, while the 1N3911 is active. For new production and long-term supply chain continuity, the 1N3911 is the recommended choice. Existing circuits using the IRD3911 can be redesigned to use the 1N3911 without circuit modification.

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