RM 4AM Equivalent & Substitute Parts Reference

Part Overview

The Sanken Electric USA Inc. RM 4AM is a standard recovery, general-purpose diode with a maximum reverse voltage of 600 V and an average rectified current of 3.2 A in through-hole, axial package format. The diode is classified as "Obsolete," making the identification and qualification of form-fit-function alternative diodes essential for ongoing design maintenance, repairs, or new assembly manufacture. Substitution is necessary to ensure continued availability, compliance, and electrical performance where the RM 4AM was previously specified.

Key Parameters

Parameter	RM 4AM Value
Manufacturer	Sanken Electric USA Inc.
Category	Diodes, Rectifiers
Voltage - DC Reverse (Vr) (Max)	600 V
Current - Average Rectified (Io)	3.2 A
Voltage - Forward (Vf) (Max) @ If	920 mV @ 3.5 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
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

All substitute diodes listed are within the Diodes, Rectifiers category and possess matching or closely matching key characteristics: maximum reverse voltage (600 V), current capability (≥3 A), through-hole mounting, and axial or DO-201AD/DO-201AA/DO-27 package equivalents. Substitute selection is strictly based on the following criteria:

Voltage - DC Reverse (Vr) (Max)
Current - Average Rectified (Io)
Package / Case / Mount Type
Speed (Standard or Fast Recovery, as specified)
Voltage - Forward (Vf) (Max) at comparable current
Current - Reverse Leakage @ Vr
Operating Temperature Range
Environmental and RoHS compliance

These parameters ensure adherence to form, fit, and function replacement requirements, as necessary for direct component interchange in existing layouts and assembly operations.

Parameter Comparison

Parameter	RM 4AM	1N5190	1N5406-E3/54	1N5406G	1N5406RLG	1N5420	31GF6-E3/54	BY253P-E3/54	GP30J-E3/73	MUR460RLG	RGP30J-E3/54	UF5406-E3/54	UF5406-E3/73
Manufacturer	Sanken	Microchip	Vishay	Taiwan Semiconductor	onsemi	Microchip	Vishay	Vishay	Vishay	onsemi	Vishay	Vishay	Vishay
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V	600 V	600 V	600 V	600 V	600 V	600 V	600 V	600 V	600 V	600 V
Current - Average Rectified (Io)	3.2 A	3 A	3 A	3 A	3 A	3 A	3 A	3 A	3 A	4 A	3 A	3 A	3 A
Voltage - Forward (Vf) (Max) @ If	920 mV @ 3.5 A	1.5 V @ 9 A	1.2 V @ 3 A	1 V @ 3 A	1 V @ 3 A	1.5 V @ 9 A	1.6 V @ 3 A	1.1 V @ 3 A	1.1 V @ 3 A	1.28 V @ 4 A	1.3 V @ 3 A	1.7 V @ 3 A	1.7 V @ 3 A
Speed	Standard Recovery >500ns	Fast Recovery ≤500ns	Standard Recovery >500ns	Standard Recovery >500ns	Standard Recovery >500ns	Fast Recovery ≤500ns	Fast Recovery ≤500ns	Standard Recovery >500ns	Standard Recovery >500ns	Fast Recovery ≤500ns	Fast Recovery ≤500ns	Fast Recovery ≤500ns	Fast Recovery ≤500ns
Current - Reverse Leakage @ Vr	10 µA @ 600 V	2 µA @ 600 V	5 µA @ 600 V	5 µA @ 600 V	10 µA @ 600 V	1 µA @ 600 V	20 µA @ 600 V	5 µA @ 600 V	5 µA @ 600 V	10 µA @ 600 V	5 µA @ 600 V	10 µA @ 600 V	10 µA @ 600 V
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Axial	B, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AA, DO-27, Axial	B, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AA, DO-27, Axial	DO-201AD, Axial	DO-201AD, Axial	DO-201AD, Axial
Operating Temperature - Junction	-40°C ~ 150°C	-65°C ~ 175°C	-50°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 175°C	-40°C ~ 150°C	-55°C ~ 150°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 150°C
RoHS Status	RoHS Compliant	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Not Applicable	1 (Unlimited)	Not Applicable	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not Applicable	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

When selecting equivalents for the Sanken RM 4AM, it is essential to consider product status (active or obsolete), RoHS status, and industry-supplied certifications such as Moisture Sensitivity Level (MSL). Substitute products listed as "Active" and "RoHS3 Compliant" are suitable for applications requiring up-to-date compliance and ongoing supply chain support. Non-compliant status or obsolete substitute parts should only be used when specific compliance is not required. All alternatives listed offer through-hole axial packages, maintaining compatibility with the original PCB footprint.

Frequently Asked Questions (FAQ)

Q: What key electrical parameters are critical when selecting a substitute for the RM 4AM diode?
A: The primary parameters are maximum reverse voltage (600 V), average rectified current (≥3 A), forward voltage drop at a similar current, speed class (standard or fast recovery), and reverse leakage current.

Q: Are the substitute parts direct mechanical replacements?
A: All substitutes listed feature through-hole, axial packages compatible with standard DO-201AD, DO-201AA, or equivalent formats as provided. Verification of physical package dimensions is required for fit in automated or manual assembly.

Q: What should be considered regarding RoHS compliance?
A: Substitute parts are available in both RoHS-compliant and non-compliant versions. RoHS compliance must be matched to end-product requirements.

Q: Is there any change required in PCB layout when using these substitutes?
A: For all axial, through-hole version substitutes, no PCB layout changes are required if package size matches the original specification (Axial or DO-201AD/AA/DO-27).

Q: Are all substitute parts currently in production?
A: Product status for each substitute is provided. Most are "Active"; verify status for long-term sourcing needs.

Q: Can fast recovery diodes be used in place of standard recovery diodes?
A: Fast recovery substitutes are included as per their provided speed parameters, given all electrical and package criteria are met per input data.

Q: Is the current rating of 3A on substitutes sufficient for the RM 4AM’s 3.2A requirement?
A: Only parameters as supplied are compared; the closest available rating in substitutes is 3 A or higher. For all detailed applications, refer to exact device specifications as provided.

Q: Are there differences in operating temperature range among substitutes?
A: Substitute temperature ranges are listed. All substitute diodes have equal or better temperature capability compared to the main part.

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