RM 1A Equivalent & Substitute Parts

Part Overview

The RM 1A is a general-purpose rectifier diode manufactured by Sanken Electric USA Inc., rated for 600 V DC reverse voltage and 1 A average rectified current in an axial through-hole package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement continuity. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating available packaging options.

Key Parameters

Parameter	RM 1A Specification
Voltage - DC Reverse (Vr) (Max)	600 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 1 A
Speed	Standard Recovery >500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	5 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 RM 1A are selected based on strict electrical and mechanical compatibility criteria. All substitute candidates must satisfy the following requirements:

Mandatory Electrical Parameters:

Voltage - DC Reverse (Vr) (Max): 600 V minimum
Current - Average Rectified (Io): 1 A minimum
Speed: Standard Recovery >500ns, > 200mA (Io)
Mounting Type: Through Hole
Forward voltage (Vf) within acceptable operating range

Mechanical Compatibility:

Package / Case: Axial or DO-204AL (DO-41) configurations
Moisture Sensitivity Level: 1 (Unlimited)

Compliance Considerations:

RoHS Status: ROHS3 Compliant or RoHS Compliant preferred
Product Status: Active or Last Time Buy acceptable; Not For New Designs acceptable for legacy applications

Substitute parts are grouped by manufacturer and packaging variant. All listed substitutes meet or exceed the electrical specifications of the RM 1A while offering active product status or improved compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Package / Case	Product Status	RoHS Status	Operating Temp (Junction)
RM 1A	Sanken Electric USA Inc.	600 V	1 A	950 mV @ 1 A	Axial	Obsolete	RoHS Compliant	-40°C ~ 150°C
1N3613	Microchip Technology	600 V	1 A	1.1 V @ 1 A	A, Axial	Active	RoHS non-compliant	-65°C ~ 175°C
1N3613GP-E3/54	Vishay General Semiconductor - Diodes Division	600 V	1 A	1 V @ 1 A	DO-204AL, DO-41, Axial	Active	ROHS3 Compliant	-65°C ~ 175°C
1N4005-E3/54	Vishay General Semiconductor - Diodes Division	600 V	1 A	1.1 V @ 1 A	DO-204AL, DO-41, Axial	Active	ROHS3 Compliant	-55°C ~ 150°C
1N4005-T	Diodes Incorporated	600 V	1 A	1 V @ 1 A	DO-204AL, DO-41, Axial	Last Time Buy	ROHS3 Compliant	-65°C ~ 150°C
1N4005-TP	Micro Commercial Co	600 V	1 A	1.1 V @ 1 A	DO-204AL, DO-41, Axial	Active	ROHS3 Compliant	-55°C ~ 150°C
1N4005G	Good-Ark Semiconductor	600 V	1 A	1.1 V @ 1 A	DO-204AL, DO-41, Axial	Active	ROHS3 Compliant	-55°C ~ 150°C
1N4005G-T	Diodes Incorporated	600 V	1 A	1 V @ 1 A	DO-204AL, DO-41, Axial	Active	ROHS3 Compliant	-65°C ~ 175°C
1N4005GP-E3/54	Vishay General Semiconductor - Diodes Division	600 V	1 A	1.1 V @ 1 A	DO-204AL, DO-41, Axial	Active	ROHS3 Compliant	-65°C ~ 175°C
1N4005GP-E3/73	Vishay General Semiconductor - Diodes Division	600 V	1 A	1.1 V @ 1 A	DO-204AL, DO-41, Axial	Active	ROHS3 Compliant	-65°C ~ 175°C
1N4005RLG	onsemi	600 V	1 A	1.1 V @ 1 A	DO-204AL, DO-41, Axial	Not For New Designs	ROHS3 Compliant	-65°C ~ 175°C

Engineering Selection Recommendations

Primary Substitutes (Active Status, ROHS3 Compliant):

The 1N4005 series from Vishay General Semiconductor (1N4005GP-E3/54, 1N4005GP-E3/73) and Diodes Incorporated (1N4005G-T) represent the most suitable replacements for the RM 1A. These parts maintain 600 V reverse voltage and 1 A current ratings with active product status and full ROHS3 compliance. The 1N4005GP-E3/54 variant offers the highest inventory availability (60,913 units) and extended operating temperature range (-65°C ~ 175°C), providing superior thermal margin compared to the RM 1A specification of -40°C ~ 150°C.

Secondary Substitutes (Active Status, Extended Temperature Range):

The 1N3613GP-E3/54 from Vishay General Semiconductor and 1N4005-TP from Micro Commercial Co provide active alternatives with ROHS3 compliance and extended temperature ranges. The 1N3613GP-E3/54 operates from -65°C ~ 175°C and features forward voltage of 1 V @ 1 A, matching the RM 1A forward voltage specification more closely than standard 1N4005 variants.

Legacy Applications (Last Time Buy Status):

The 1N4005-T from Diodes Incorporated carries Last Time Buy status with ROHS3 compliance and extended temperature range (-65°C ~ 150°C). This part is suitable for existing designs requiring component continuity but should not be selected for new designs.

Compliance Consideration:

The 1N3613 from Microchip Technology is active but RoHS non-compliant. Selection of this part is restricted to applications where RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can the RM 1A be directly replaced with any 1N4005 variant?

A: Yes. All 1N4005 variants listed meet the mandatory electrical specifications of 600 V reverse voltage and 1 A average rectified current. The primary difference between variants is forward voltage (1 V or 1.1 V @ 1 A), operating temperature range, and packaging configuration. Axial package variants are mechanically interchangeable with the RM 1A.

Q: What is the difference between DO-204AL and DO-41 package designations?

A: DO-204AL and DO-41 refer to the same physical package configuration. DO-204AL is the formal JEDEC designation, while DO-41 is the legacy designation. These terms are used interchangeably for axial through-hole diodes.

Q: Does forward voltage difference affect circuit performance?

A: Forward voltage differences between 950 mV (RM 1A) and 1.1 V (most 1N4005 variants) represent a 150 mV maximum variation. In rectifier applications, this difference affects power dissipation and voltage drop across the diode. Circuit analysis is required to determine if this variation is acceptable for the specific application.

Q: Why is the 1N3613 listed as RoHS non-compliant?

A: The 1N3613 from Microchip Technology does not meet ROHS3 compliance requirements. Selection of this part is limited to applications where RoHS compliance is not mandated by design specifications or regulatory requirements.

Q: What is the significance of product status classifications?

A: Active status indicates the part is in current production and available for new designs. Last Time Buy status indicates limited availability and production discontinuation; these parts are suitable for legacy design support only. Not For New Designs status indicates the part is obsolete or superseded; use is restricted to existing applications. Obsolete status (RM 1A) indicates the part is no longer manufactured and substitution is necessary.

Q: Are all substitute parts available in the same packaging options?

A: No. The RM 1A is available only in axial packaging. Substitute parts are available in multiple configurations: axial, DO-204AL (DO-41), and various tape and reel formats. For direct mechanical replacement, select variants explicitly listed as axial or DO-41 package.

Q: Which substitute offers the best thermal performance?

A: The 1N4005GP-E3/54, 1N4005GP-E3/73, 1N4005G-T, and 1N3613GP-E3/54 all operate across -65°C ~ 175°C, providing 25°C additional upper temperature margin compared to the RM 1A (-40°C ~ 150°C). This extended range accommodates higher ambient operating conditions and provides thermal design margin.

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