RU 2B Equivalent & Substitute Parts

Part Overview

The RU 2B is a general-purpose rectifier diode manufactured by Sanken Electric USA Inc., rated for 800 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 functionally equivalent alternatives for ongoing design support and production continuity. Substitute parts must maintain electrical equivalence across voltage, current, and thermal specifications while accommodating available packaging and delivery formats.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 1 A	V
Reverse Recovery Time (trr)	400	ns
Current - Reverse Leakage @ Vr	10	µA @ 800 V
Operating Temperature - Junction	-40 to 150	°C
Mounting Type	Through Hole	-
Package / Case	Axial	-
Technology	Standard	-
RoHS Status	RoHS Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the RU 2B is determined by the following critical parameters:

Mandatory Electrical Equivalence:

Voltage - DC Reverse (Vr) (Max): 800 V minimum
Current - Average Rectified (Io): 1 A minimum
Forward voltage (Vf) within acceptable operating range
Reverse leakage current within specified limits

Mechanical Compatibility:

Mounting Type: Through Hole
Package / Case: Axial or DO-204AL (DO-41) compatible packages

Environmental & Compliance:

Operating Temperature Range: Must encompass or exceed -40°C to 150°C
RoHS Status: RoHS3 Compliant preferred for regulatory alignment
Technology: Standard recovery diode classification

All substitute parts listed maintain 800 V reverse voltage rating and 1 A average rectified current specification. Variations in forward voltage, reverse recovery time, and reverse leakage current are within acceptable engineering tolerances for general-purpose rectification applications. Package format variations (axial vs. DO-41) are mechanically interchangeable in through-hole mounting configurations.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [V]	trr [ns/µs]	Ir @ 800V [µA]	Tj Range [°C]	Package	Product Status
RU 2B	Sanken Electric USA Inc.	800	1	1.5	400 ns	10	-40 to 150	Axial	Obsolete
1N4006-E3/73	Vishay General Semiconductor	800	1	1.1	>500 ns	5	-55 to 150	DO-204AL (DO-41)	Active
1N4006-T	Diodes Incorporated	800	1	1.0	>500 ns	5	-65 to 150	DO-41	Last Time Buy
1N4006-TP	Micro Commercial Co	800	1	1.1	>500 ns	5	-55 to 150	DO-41	Active
1N4006FFG	onsemi	800	1	1.1	>500 ns	10	-65 to 175	Axial	Last Time Buy
1N4006G	Taiwan Semiconductor Corporation	800	1	1.0	>500 ns	5	-55 to 150	DO-204AL (DO-41)	Active
1N4006G-T	Diodes Incorporated	800	1	1.0	>500 ns	5	-65 to 175	DO-41	Active
1N4006GP-E3/54	Vishay General Semiconductor	800	1	1.1	>500 ns	5	-65 to 175	DO-204AL (DO-41)	Active
1N4006GP-E3/73	Vishay General Semiconductor	800	1	1.1	>500 ns	5	-65 to 175	DO-204AL (DO-41)	Active
1N4006RLG	onsemi	800	1	1.1	>500 ns	10	-65 to 175	Axial	Not For New Designs
1N4248GP-E3/54	Vishay General Semiconductor	800	1	1.2	>500 ns	1	-65 to 160	DO-204AL (DO-41)	Active

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

The following parts are recommended as primary substitutes due to active product status and full compliance with RoHS3 standards:

1N4006-TP (Micro Commercial Co): Active status with highest inventory availability (69,145 pcs). Meets all electrical specifications with standard recovery characteristics. Suitable for immediate production deployment.
1N4006G-T (Diodes Incorporated): Active status with extended operating temperature range (-65°C to 175°C), providing thermal margin beyond the RU 2B specification. Inventory of 10,527 pcs supports sustained supply.
1N4006GP-E3/54 and 1N4006GP-E3/73 (Vishay General Semiconductor): Active status with SUPERECTIFIER® series designation. Extended temperature range (-65°C to 175°C) and low reverse leakage (5 µA). Suitable for applications requiring enhanced thermal performance.
1N4006G (Taiwan Semiconductor Corporation): Active status with standard specifications and 1,440 pcs inventory.

Secondary Substitutes (Limited Availability):

1N4006-E3/73 (Vishay General Semiconductor): Active status with 8,700 pcs inventory. Standard recovery characteristics with reduced forward voltage (1.1 V).
1N4248GP-E3/54 (Vishay General Semiconductor): Active status with superior reverse leakage performance (1 µA @ 800 V). Suitable for low-leakage applications. Inventory of 961 pcs.

Not Recommended for New Designs:

1N4006-T (Diodes Incorporated): Last Time Buy status indicates production discontinuation.
1N4006FFG (onsemi): Last Time Buy status.
1N4006RLG (onsemi): Not For New Designs status.

All recommended substitutes maintain 800 V reverse voltage and 1 A average rectified current ratings. Package compatibility (axial and DO-41 formats) accommodates existing through-hole PCB layouts without mechanical redesign.

Frequently Asked Questions (FAQ)

Q: Can I directly replace RU 2B with any of the listed substitute parts?

A: Yes, all listed substitute parts maintain electrical equivalence at the critical parameters: 800 V reverse voltage rating and 1 A average rectified current. Through-hole mounting compatibility (axial and DO-41 packages) allows direct PCB substitution without layout modification.

Q: What is the difference between axial and DO-41 package formats?

A: Both axial and DO-41 (DO-204AL) packages are through-hole mounted rectifier diodes with identical electrical specifications. Axial packages feature leads extending from opposite ends of the component body, while DO-41 packages have leads extending from the same end. Both formats are mechanically interchangeable in standard through-hole PCB designs.

Q: Why do some substitute parts have lower forward voltage (Vf) than the RU 2B?

A: Forward voltage variation (1.0 V to 1.5 V @ 1 A) is within normal manufacturing tolerance for standard recovery diodes. Lower forward voltage in substitute parts (1.0 V to 1.1 V) represents improved efficiency with reduced power dissipation. This is beneficial for thermal management and does not compromise circuit functionality.

Q: What does "Last Time Buy" or "Not For New Designs" product status mean?

A: Last Time Buy indicates the manufacturer has announced production discontinuation with a final order deadline. Not For New Designs indicates the part is in legacy support phase with no active development. These parts should not be selected for new circuit designs; use Active status parts instead.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts carry RoHS3 Compliant certification, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: Which substitute part offers the best thermal performance?

A: Parts with extended operating temperature ranges provide thermal margin: 1N4006G-T, 1N4006GP-E3/54, 1N4006GP-E3/73, and 1N4006RLG all support -65°C to 175°C operation, compared to the RU 2B specification of -40°C to 150°C.

Q: What is reverse recovery time (trr) and why does it vary?

A: Reverse recovery time is the interval required for a diode to transition from forward conduction to reverse blocking state. The RU 2B specifies 400 ns (fast recovery), while most substitute parts specify >500 ns (standard recovery). Standard recovery diodes are suitable for general-purpose rectification; fast recovery is required only for high-frequency switching applications.

Q: Which substitute part has the lowest reverse leakage current?

A: The 1N4248GP-E3/54 exhibits the lowest reverse leakage at 1 µA @ 800 V, compared to 5-10 µA in other substitutes. This part is suitable for applications requiring minimal leakage current, such as precision analog circuits or high-impedance measurement systems.

Q: Can I use substitute parts with higher temperature ratings in place of the RU 2B?

A: Yes. Higher temperature ratings provide additional thermal margin and do not degrade circuit performance. Parts rated to -65°C to 175°C are fully compatible with applications designed for -40°C to 150°C operation.

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