Equivalent & Substitute Parts for Sanken Electric USA Inc. RU 3B

Part Overview

The Sanken Electric USA Inc. RU 3B is an axial, through-hole, general-purpose rectifier diode rated for 800 V reverse voltage and 1.1 A average rectified current, featuring a maximum forward voltage drop of 1.5 V at 1 A. The RU 3B is currently obsolete, necessitating the identification of suitable substitute diodes within the same category (Diodes, Rectifiers) that match or exceed the electrical and mechanical requirements detailed below.

Key Parameters

Parameter	RU 3B
Category	Diodes, Rectifiers
Voltage - DC Reverse (Vr) (Max)	800 V
Current - Average Rectified (Io)	1.1 A
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 1 A
Speed	Fast Recovery ≤ 500ns, >200mA (Io)
Reverse Recovery Time (trr)	400 ns
Current - Reverse Leakage @ Vr	10 µA @ 600 V
Mounting Type	Through Hole
Package / Case	Axial
Operating Temperature - Junction	-40°C ~ 150°C
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitute parts for the RU 3B are grouped strictly by the following essential matching parameters: category (Diodes, Rectifiers), maximum DC reverse voltage (800 V), average rectified current (≥1.1 A), through-hole mounting, axial package (DO-204AL, DO-41, DO-204AC, DO-15), and RoHS compliance. All listed substitutes are selected on the basis of these electrical and mechanical parameters.

Parameter Comparison

Parameter	RU 3B	1N5398-E3/54	1N5398GP-E3/54
Category	Diodes, Rectifiers	Diodes, Rectifiers	Diodes, Rectifiers
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V
Current - Average Rectified (Io)	1.1 A	1.5 A	1.5 A
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 1 A	1.4 V @ 1.5 A	1.4 V @ 1.5 A
Speed	Fast Recovery ≤ 500ns, >200mA (Io)	Standard Recovery >500ns, >200mA (Io)	Standard Recovery >500ns, >200mA (Io)
Reverse Recovery Time (trr)	400 ns	2 µs	2 µs
Current - Reverse Leakage @ Vr	10 µA @ 600 V	5 µA @ 800 V	5 µA @ 800 V
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Axial	DO-204AL, DO-41, Axial	DO-204AC, DO-15, Axial
Operating Temperature - Junction	-40°C ~ 150°C	-50°C ~ 150°C	-65°C ~ 175°C
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The Sanken Electric USA Inc. RU 3B is obsolete. Both 1N5398-E3/54 and 1N5398GP-E3/54 are active, RoHS-compliant replacements available in through-hole, axial packages. All listed substitute parts have RoHS compliance, meet or exceed the electrical ratings of the RU 3B, and are suitable for use as equivalents based on the provided information.

Frequently Asked Questions (FAQ)

Q: What are the primary criteria for substituting the RU 3B diode?
A: Substitution is strictly based on maintaining or exceeding the voltage and current ratings, using the same category (Diodes, Rectifiers), matching package type (through-hole, axial), and compliance status (RoHS).

Q: Are the alternative diodes compatible with existing through-hole PCB designs?
A: All listed substitutes use through-hole, axial packages—ensuring mechanical compatibility when replacing the RU 3B in existing designs.

Q: Do the substitute diodes exceed the original part's ratings?
A: Both 1N5398-E3/54 and 1N5398GP-E3/54 exceed the RU 3B’s average rectified current rating and maintain the same maximum reverse voltage.

Q: Is it necessary to review reverse recovery time differences?
A: Substitute selection here is purely based on the specified speed and reverse recovery time parameters in the provided data for this product category.

Q: How do the RoHS statuses compare?
A: All parts listed, including substitutes, are RoHS compliant according to the provided data.

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