IRD3910R Equivalent & Substitute Parts Reference

Part Overview

The IRD3910R is a general-purpose fast recovery rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 100 V DC 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 alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating the stud mount chassis configuration.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	30	A
Voltage - Forward (Vf) (Max) @ If	1.8 V @ 62.8 A	V @ A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	350	ns
Current - Reverse Leakage @ Vr	80	µA @ 100 V
Mounting Type	Chassis, Stud Mount	—
Package / Case	DO-203AB (DO-5)	—
Operating Temperature - Junction	-40 to 125	°C

Substitute Part Grouping Explanation

Substitution eligibility for the IRD3910R is determined by the following mandatory parameters:

Voltage Compatibility: All substitute parts must maintain a DC reverse voltage rating (Vr) of 100 V or greater to ensure safe operation in the original circuit application.

Current Rating: Substitute parts must support the average rectified current (Io) requirement of 30 A or higher. Parts rated below 30 A are not suitable for direct substitution.

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

Speed Classification: All substitute parts must maintain fast recovery characteristics (≤ 500ns, > 200mA) to preserve circuit performance and switching behavior.

Temperature Range: Operating temperature specifications must accommodate the original design requirements.

The three active substitute parts identified—1N3900R, 1N3910AR, and 1N3910R—all meet these core substitution criteria. The 1N3900R operates at 20 A, which is below the 30 A requirement and therefore represents a downgrade in current capacity. The 1N3910AR and 1N3910R both exceed the 30 A requirement at 50 A, providing enhanced current handling capability while maintaining all other electrical and mechanical parameters.

Parameter Comparison

Parameter	IRD3910R (Main)	1N3900R	1N3910AR	1N3910R
Manufacturer	Vishay General Semiconductor	Microchip Technology	Microchip Technology	Microchip Technology
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	100 V	100 V
Current - Average Rectified (Io)	30 A	20 A	50 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 ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Reverse Recovery Time (trr)	350 ns	200 ns	150 ns	200 ns
Current - Reverse Leakage @ Vr	80 µA @ 100 V	50 µA @ 100 V	15 µA @ 100 V	15 µA @ 100 V
Mounting Type	Chassis, Stud Mount	Stud Mount	Stud Mount	Stud Mount
Package / Case	DO-203AB (DO-5)	DO-203AB (DO-5)	DO-203AB (DO-5)	DO-203AB (DO-5)
Operating Temperature - Junction	-40 to 125°C	-65 to 150°C	-65 to 150°C	-65 to 150°C
RoHS Status	RoHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant

Engineering Selection Recommendations

1N3910AR and 1N3910R (Preferred Substitutes)

Both 1N3910AR and 1N3910R are active Microchip Technology products that exceed the IRD3910R current rating at 50 A, providing operational margin above the 30 A requirement. Both parts maintain 100 V reverse voltage compatibility, fast recovery characteristics, and DO-203AB stud mount packaging. The 1N3910AR features a reverse recovery time of 150 ns, while the 1N3910R operates at 200 ns; both are improvements over the original 350 ns specification. Both parts support an extended operating temperature range of -65 to 150°C compared to the original -40 to 125°C range. However, both parts are RoHS non-compliant, which may impact suitability for applications requiring RoHS3 compliance.

1N3900R (Limited Substitution)

The 1N3900R is an active Microchip Technology product with 100 V reverse voltage and fast recovery characteristics in DO-203AB stud mount packaging. However, the 20 A average rectified current rating falls below the 30 A requirement of the IRD3910R. This part is suitable only for applications where the actual circuit current demand is confirmed to be 20 A or lower. The 1N3900R also exhibits RoHS non-compliance.

Compliance Considerations

The IRD3910R carries RoHS3 compliance certification. All three substitute parts are RoHS non-compliant. Applications subject to RoHS3 regulatory requirements must evaluate the impact of this compliance difference before implementing substitution.

Frequently Asked Questions (FAQ)

Q: Can the 1N3900R directly replace the IRD3910R?

A: The 1N3900R is not a direct replacement due to its 20 A current rating, which is below the IRD3910R's 30 A specification. Substitution is limited to applications where the actual circuit current demand does not exceed 20 A. All other electrical and mechanical parameters are compatible.

Q: What is the primary difference between 1N3910AR and 1N3910R?

A: Both parts are rated for 100 V and 50 A with DO-203AB stud mount packaging. The 1N3910AR features a reverse recovery time of 150 ns, while the 1N3910R operates at 200 ns. Both represent improvements over the original IRD3910R specification of 350 ns. Selection between these two parts depends on circuit switching speed requirements.

Q: Are the substitute parts mechanically compatible with existing IRD3910R installations?

A: Yes. All three substitute parts use the DO-203AB (DO-5) stud mount package, which provides mechanical and thermal compatibility with existing chassis designs originally specified for the IRD3910R.

Q: How do the forward voltage characteristics compare?

A: The IRD3910R specifies 1.8 V forward voltage at 62.8 A. All three substitute parts specify 1.4 V forward voltage at their respective rated currents (1N3900R at 63 A, 1N3910AR and 1N3910R at 50 A). The lower forward voltage in substitute parts results in reduced power dissipation during conduction.

Q: What is the impact of RoHS compliance differences?

A: The IRD3910R is RoHS3 compliant, while all substitute parts are RoHS non-compliant. Applications subject to RoHS3 regulatory requirements or customer specifications must evaluate whether this compliance difference is acceptable for the intended application.

Q: Do the substitute parts support the same temperature range?

A: The IRD3910R operates from -40 to 125°C. All three substitute parts support an extended range of -65 to 150°C, providing greater thermal margin for applications operating at temperature extremes.

Q: What is reverse leakage current, and how do the parts compare?

A: Reverse leakage current is the small current that flows through a reverse-biased diode. The IRD3910R specifies 80 µA at 100 V. The 1N3900R specifies 50 µA, while both 1N3910AR and 1N3910R specify 15 µA. Lower reverse leakage reduces standby power consumption and heat generation in reverse bias conditions.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message