Equivalent & Substitute Parts for RU 2 General Purpose Rectifier Diode

Part Overview

The RU 2 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. The RU 2 features fast recovery characteristics with a reverse recovery time of 400 ns, making it suitable for standard rectification applications requiring moderate switching speeds.

Key Parameters

Parameter	RU 2 Specification
Voltage - DC Reverse (Vr) (Max)	600 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 1 A
Speed Classification	Fast Recovery ≤ 500 ns, > 200 mA (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 2 are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) (Max): 600 V minimum
Current - Average Rectified (Io): 1 A minimum
Mounting Type: Through Hole
Package / Case: Axial or equivalent through-hole form factor (DO-204AL, DO-41)

Secondary Compatibility Considerations:

Operating Temperature Range: Must encompass or exceed the RU 2 range of -40°C to 150°C
RoHS Compliance: Active substitutes prioritized for regulatory alignment
Product Status: Active or Last Time Buy status preferred over obsolete classifications

Substitute parts are grouped into two categories: Direct Electrical Equivalents (matching all primary parameters) and Functional Equivalents (meeting electrical requirements with standard recovery characteristics). The RU 2's fast recovery specification (400 ns) is not matched by all substitutes; parts with standard recovery characteristics (>500 ns) remain functionally compatible for general rectification applications where switching speed is not the limiting design factor.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ 1A	Speed	trr	Ir @ Vr	Package	Temp Range	Product Status	RoHS
RU 2	Sanken Electric USA Inc.	600 V	1 A	1.5 V	Fast Recovery ≤ 500 ns	400 ns	10 µA @ 600 V	Axial	-40°C ~ 150°C	Obsolete	RoHS Compliant
1N3613	Microchip Technology	600 V	1 A	1.1 V	Standard Recovery >500 ns	—	1 µA @ 600 V	Axial	-65°C ~ 175°C	Active	Non-compliant
1N3613GP-E3/54	Vishay General Semiconductor - Diodes Division	600 V	1 A	1 V	Standard Recovery >500 ns	2 µs	1 µA @ 600 V	DO-204AL (DO-41)	-65°C ~ 175°C	Active	ROHS3 Compliant
1N4005-E3/54	Vishay General Semiconductor - Diodes Division	600 V	1 A	1.1 V	Standard Recovery >500 ns	—	5 µA @ 600 V	DO-204AL (DO-41)	-55°C ~ 150°C	Active	ROHS3 Compliant
1N4005-T	Diodes Incorporated	600 V	1 A	1 V	Standard Recovery >500 ns	2 µs	5 µA @ 600 V	DO-41	-65°C ~ 150°C	Last Time Buy	ROHS3 Compliant
1N4005-TP	Micro Commercial Co	600 V	1 A	1.1 V	Standard Recovery >500 ns	2 µs	5 µA @ 600 V	DO-41	-55°C ~ 150°C	Active	ROHS3 Compliant
1N4005G	Good-Ark Semiconductor	600 V	1 A	1.1 V	Standard Recovery >500 ns	1 µs	5 µA @ 600 V	DO-204AL (DO-41)	-55°C ~ 150°C	Active	ROHS3 Compliant
1N4005G-T	Diodes Incorporated	600 V	1 A	1 V	Standard Recovery >500 ns	2 µs	5 µA @ 600 V	DO-41	-65°C ~ 175°C	Active	ROHS3 Compliant
1N4005GP-E3/54	Vishay General Semiconductor - Diodes Division	600 V	1 A	1.1 V	Standard Recovery >500 ns	2 µs	5 µA @ 600 V	DO-204AL (DO-41)	-65°C ~ 175°C	Active	ROHS3 Compliant
1N4005GP-E3/73	Vishay General Semiconductor - Diodes Division	600 V	1 A	1.1 V	Standard Recovery >500 ns	2 µs	5 µA @ 600 V	DO-204AL (DO-41)	-65°C ~ 175°C	Active	ROHS3 Compliant
1N4005RLG	onsemi	600 V	1 A	1.1 V	Standard Recovery >500 ns	—	10 µA @ 600 V	Axial	-65°C ~ 175°C	Not For New Designs	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

The following parts are recommended as primary substitutes for the RU 2 based on active product status and full RoHS3 compliance:

1N4005GP-E3/54 (Vishay General Semiconductor - Diodes Division): Active status, ROHS3 compliant, extended temperature range (-65°C to 175°C), 60,913 units in stock. Meets all electrical requirements with standard recovery characteristics.
1N4005GP-E3/73 (Vishay General Semiconductor - Diodes Division): Active status, ROHS3 compliant, extended temperature range (-65°C to 175°C), 12,200 units in stock. Functionally identical to 1N4005GP-E3/54 with alternative packaging designation.
1N4005G-T (Diodes Incorporated): Active status, ROHS3 compliant, extended temperature range (-65°C to 175°C), 21,675 units in stock. Meets all electrical requirements with standard recovery characteristics.
1N4005-TP (Micro Commercial Co): Active status, ROHS3 compliant, 110,625 units in stock. Highest inventory availability among active substitutes.

Secondary Substitutes (Alternative Options):

1N3613GP-E3/54 (Vishay General Semiconductor - Diodes Division): Active status, ROHS3 compliant, extended temperature range (-65°C to 175°C), 949 units in stock. Meets all electrical requirements.
1N4005-T (Diodes Incorporated): Last Time Buy status, ROHS3 compliant, 11,192 units in stock. Suitable for applications where long-term availability is not critical.

Not Recommended for New Designs:

1N3613 (Microchip Technology): RoHS non-compliant status disqualifies this part for new designs in regulated environments.
1N4005RLG (onsemi): Not For New Designs status indicates manufacturer discontinuation trajectory.

All recommended substitutes maintain the 600 V / 1 A electrical specification and through-hole mounting configuration. The transition from fast recovery (RU 2: 400 ns) to standard recovery (>500 ns) characteristics does not compromise functionality in general rectification applications where switching frequency is not the primary design constraint.

Frequently Asked Questions (FAQ)

Q: Can the RU 2 be directly replaced with 1N4005 series diodes?

A: Yes. The 1N4005 series (1N4005-E3/54, 1N4005-T, 1N4005-TP, 1N4005G, 1N4005G-T, 1N4005GP-E3/54, 1N4005GP-E3/73) meets the primary electrical requirements of 600 V reverse voltage and 1 A average rectified current. The primary difference is recovery speed classification: the RU 2 features fast recovery (400 ns), while 1N4005 variants use standard recovery (>500 ns). This difference is not significant for general rectification applications.

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

A: DO-204AL and DO-41 refer to the same axial through-hole package form factor. DO-204AL is the formal JEDEC designation, while DO-41 is the legacy designation. Both terms describe identical physical packages suitable for the RU 2 replacement.

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

A: The 1N3613 from Microchip Technology carries RoHS non-compliant status, indicating it does not meet Restriction of Hazardous Substances directives. This classification restricts its use in applications subject to RoHS regulations. ROHS3-compliant alternatives such as 1N4005GP-E3/54 are preferred for regulated applications.

Q: Does the forward voltage difference between RU 2 (1.5 V) and substitute parts (1.0–1.1 V) affect circuit performance?

A: Forward voltage differences of this magnitude (0.4–0.5 V) are within typical design tolerances for general rectification circuits. However, applications with tight voltage regulation requirements should evaluate the specific impact on circuit performance. The lower forward voltage of substitute parts (1.0–1.1 V) generally results in reduced power dissipation compared to the RU 2.

Q: Are all substitute parts available in the same axial package as the RU 2?

A: Most substitute parts are available in DO-204AL (DO-41) axial packages, which are mechanically compatible with the RU 2 axial package. The 1N3613 and 1N3613GP-E3/54 are explicitly designated as axial packages. Verify specific packaging designations during procurement to ensure mechanical compatibility with existing PCB layouts.

Q: What is the significance of "Last Time Buy" product status for the 1N4005-T?

A: Last Time Buy status indicates that the manufacturer (Diodes Incorporated) has announced discontinuation of the 1N4005-T. While currently available (11,192 units in stock), procurement should transition to active-status alternatives such as 1N4005-TP or 1N4005G-T for long-term design continuity.

Q: Can the RU 2 be replaced with the 1N3613 from Microchip Technology?

A: The 1N3613 meets all electrical requirements (600 V, 1 A, axial package). However, RoHS non-compliant status restricts its use in regulated applications. For new designs, ROHS3-compliant alternatives are strongly preferred.

Q: What inventory levels should be considered when selecting a substitute?

A: Inventory levels vary significantly among substitutes. The 1N4005-TP offers the highest availability (110,625 units), followed by 1N4005GP-E3/54 (60,913 units) and 1N4005G-T (21,675 units). For applications requiring immediate procurement or long-term supply assurance, parts with higher inventory levels provide greater supply chain stability.

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