RM 4A Equivalent & Substitute Parts Reference

Part Overview

The RM 4A is a general-purpose rectifier diode manufactured by Sanken Electric USA Inc., classified under Diodes, Rectifiers. It features a voltage rating of 600 V, an average rectified current of 3A, and is packaged in an axial through-hole format. This model is marked as obsolete, making it necessary to identify alternative and substitute parts to maintain design continuity, serviceability, and supply chain resilience.

Key Parameters

Parameter	RM 4A
Category	Diodes, Rectifiers
Voltage - DC Reverse (Vr) (Max)	600 V
Current - Average Rectified (Io)	3A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 3 A
Speed	Standard Recovery >500ns, > 200mA (Io)
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 and equivalent diode rectifiers are identified based strictly on the following key parameters:

Voltage - DC Reverse (Vr) (Max)
Current - Average Rectified (Io)
Voltage - Forward (Vf) (Max) @ If
Reverse Recovery Speed
Current - Reverse Leakage @ Vr
Mounting Type
Package / Case
Operating Temperature - Junction
RoHS Compliance

Only those parts matching or exceeding these criteria are listed as suitable equivalents or substitutes.

Parameter Comparison

Part Number	Manufacturer	Voltage - DC Reverse (Vr) (Max)	Current - Average Rectified (Io)	Voltage - Forward (Vf) (Max) @ If	Speed	Current - Reverse Leakage @ Vr	Mounting Type	Package / Case	Operating Temperature - Junction	RoHS Status
RM 4A	Sanken Electric USA Inc.	600 V	3A	950 mV @ 3 A	Standard Recovery >500ns, > 200mA (Io)	10 µA @ 600 V	Through Hole	Axial	-40°C ~ 150°C	RoHS Compliant
1N5190	Microchip Technology	600 V	3A	1.5 V @ 9 A	Fast Recovery ≤500ns, > 200mA (Io)	2 µA @ 600 V	Through Hole	B, Axial	-65°C ~ 175°C	RoHS non-compliant
1N5406-E3/54	Vishay General Semiconductor	600 V	3A	1.2 V @ 3 A	Standard Recovery >500ns, > 200mA (Io)	5 µA @ 600 V	Through Hole	DO-201AD, Axial	-50°C ~ 150°C	RoHS3 Compliant
1N5406G	Taiwan Semiconductor Corporation	600 V	3A	1 V @ 3 A	Standard Recovery >500ns, > 200mA (Io)	5 µA @ 600 V	Through Hole	DO-201AD, Axial	-55°C ~ 150°C	RoHS3 Compliant
1N5406RLG	onsemi	600 V	3A	1 V @ 3 A	Standard Recovery >500ns, > 200mA (Io)	10 µA @ 600 V	Through Hole	DO-201AA, DO-27, Axial	-65°C ~ 150°C	RoHS3 Compliant
1N5420	Microchip Technology	600 V	3A	1.5 V @ 9 A	Fast Recovery ≤500ns, > 200mA (Io)	1 µA @ 600 V	Through Hole	B, Axial	-65°C ~ 175°C	RoHS non-compliant
31GF6-E3/54	Vishay General Semiconductor	600 V	3A	1.6 V @ 3 A	Fast Recovery ≤500ns, > 200mA (Io)	20 µA @ 600 V	Through Hole	DO-201AD, Axial	-40°C ~ 150°C	RoHS3 Compliant
BY253P-E3/54	Vishay General Semiconductor	600 V	3A	1.1 V @ 3 A	Standard Recovery >500ns, > 200mA (Io)	5 µA @ 600 V	Through Hole	DO-201AD, Axial	-55°C ~ 150°C	RoHS3 Compliant
GI506-E3/54	Vishay General Semiconductor	600 V	3A	1.1 V @ 9.4 A	Standard Recovery >500ns, > 200mA (Io)	5 µA @ 600 V	Through Hole	DO-201AD, Axial	-50°C ~ 150°C	RoHS3 Compliant
UF5406-E3/73	Vishay General Semiconductor	600 V	3A	1.7 V @ 3 A	Fast Recovery ≤500ns, > 200mA (Io)	10 µA @ 600 V	Through Hole	DO-201AD, Axial	-55°C ~ 150°C	RoHS3 Compliant

Engineering Selection Recommendations

The RM 4A diode has an obsolete product status and is RoHS compliant. For engineering applications requiring RoHS compliance, substitute parts such as 1N5406-E3/54, 1N5406G, 1N5406RLG, 31GF6-E3/54, BY253P-E3/54, GI506-E3/54, and UF5406-E3/73 are RoHS3 compliant and match the key parameters. Substitute parts 1N5190 and 1N5420 are RoHS non-compliant. Selection should be aligned with compatibility and compliance requirements as set forth in the part specifications.

Frequently Asked Questions (FAQ)

Q1: What defines an acceptable substitute or equivalent for RM 4A?
A1: Acceptable substitutes must match the key parameters: voltage and current ratings, voltage forward drop, recovery speed, leakage current, mounting type, package/case, operating temperature range, and RoHS compliance.

Q2: Can I use a part with a different package/case as a replacement?
A2: Substitute parts must use an axial through-hole package or equivalent as listed to ensure compatibility with existing PCB assemblies and mechanical constraints.

Q3: How important is RoHS compliance when selecting substitutes for RM 4A?
A3: RoHS compliance is critical when required by application, regulatory, or regional standards. Only use RoHS or RoHS3 compliant substitutes if compliance is mandated.

Q4: Are there differences in performance among the listed substitute rectifiers for RM 4A?
A4: Substitute parts strictly conform to the key electrical and mechanical parameters provided. Differences outside of the listed parameters are not considered for this reference.

Q5: What recovery speed category is required for RM 4A substitutes?
A5: Substitute rectifiers must maintain at least standard recovery (>500ns, >200mA) or fast recovery (≤500ns, >200mA), as specified for the main and listed substitutes.

Q6: What should be checked for mechanical compatibility?
A6: Check that the package/case is axial and through-hole, matching the original footprint for RM 4A, to confirm physical interchangeability.

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