EU2 General Purpose Rectifier Diode 400V 1A Equivalent & Substitute Parts

Part Overview

The EU2 is a general purpose rectifier diode manufactured by Sanken Electric USA Inc., rated for 400V DC reverse voltage and 1A average rectified current in an axial through-hole package. This component is classified as active and remains in production. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility within the general purpose rectifier diode category. Substitutes enable design flexibility, support supply chain alternatives, and accommodate different packaging or sourcing requirements while maintaining functional equivalence.

Key Parameters

Parameter	EU2 Specification
Voltage - DC Reverse (Vr) (Max)	400 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	1.4 V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	400 ns
Current - Reverse Leakage @ Vr	10 µA @ 400 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

Substitute parts for the EU2 are qualified based on the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Current - Average Rectified (Io): 1 A minimum
Mounting Type: Through Hole
Package / Case: Axial or DO-204AL (DO-41) compatible

Substitution Logic: Parts are grouped as functional equivalents when they meet or exceed the EU2 electrical ratings and maintain through-hole axial or standard DO-41 package compatibility. The EU2 operates as a fast recovery diode (≤ 500ns). Substitute parts classified as standard recovery (> 500ns) are electrically compatible for general purpose rectification applications where the faster recovery characteristic is not a circuit requirement. Forward voltage, reverse leakage current, and operating temperature range variations are documented to enable informed selection based on specific application constraints.

Key Parameters for Substitution:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 1 A
Mounting Type: Through Hole
Package / Case: Axial or DO-41
Technology: Standard

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	trr	Ir @ Vr	Package	Temp Range	Product Status
EU2	Sanken Electric USA Inc.	400 V	1 A	1.4 V @ 1 A	Fast Recovery ≤ 500ns	400 ns	10 µA @ 400 V	Axial	-40°C ~ 150°C	Active
1N4004-E3/54	Vishay General Semiconductor	400 V	1 A	1.1 V @ 1 A	Standard Recovery > 500ns	—	5 µA @ 400 V	DO-204AL (DO-41)	-55°C ~ 150°C	Active
1N4004-E3/73	Vishay General Semiconductor	400 V	1 A	1.1 V @ 1 A	Standard Recovery > 500ns	—	5 µA @ 400 V	DO-204AL (DO-41)	-55°C ~ 150°C	Active
1N4004-T	Diodes Incorporated	400 V	1 A	1 V @ 1 A	Standard Recovery > 500ns	—	5 µA @ 400 V	DO-204AL (DO-41)	-65°C ~ 150°C	Last Time Buy
1N4004-TP	Micro Commercial Co	400 V	1 A	1.1 V @ 1 A	Standard Recovery > 500ns	2 µs	5 µA @ 400 V	DO-204AL (DO-41)	-55°C ~ 150°C	Active
1N4004G	Rectron USA	400 V	1 A	1 V @ 1 A	Standard Recovery > 500ns	—	200 nA @ 400 V	DO-204AL (DO-41)	-65°C ~ 175°C	Active
1N4004G-T	Diodes Incorporated	400 V	1 A	1 V @ 1 A	Standard Recovery > 500ns	2 µs	5 µA @ 400 V	DO-204AL (DO-41)	-65°C ~ 175°C	Active
1N4004GP-E3/54	Vishay General Semiconductor	400 V	1 A	1.1 V @ 1 A	Standard Recovery > 500ns	2 µs	5 µA @ 400 V	DO-204AL (DO-41)	-65°C ~ 175°C	Active
1N4004GP-E3/73	Vishay General Semiconductor	400 V	1 A	1.1 V @ 1 A	Standard Recovery > 500ns	2 µs	5 µA @ 400 V	DO-204AL (DO-41)	-65°C ~ 175°C	Active
1N4004GP-TP	Micro Commercial Co	400 V	1 A	1.1 V @ 1 A	Standard Recovery > 500ns	2 µs	5 µA @ 400 V	DO-204AL (DO-41)	-55°C ~ 150°C	Active
1N4004RLG	onsemi	400 V	1 A	1.1 V @ 1 A	Standard Recovery > 500ns	—	10 µA @ 400 V	Axial	-65°C ~ 175°C	Not For New Designs

Engineering Selection Recommendations

Active Production Parts (Recommended for New Designs):

The following substitute parts are in active production status and carry current RoHS3 compliance certification:

1N4004GP-E3/54 (Vishay): Highest inventory availability (40,609 pcs). SUPERECTIFIER® series designation. Operating range -65°C ~ 175°C. Forward voltage 1.1 V @ 1 A. Reverse recovery time 2 µs specified.
1N4004G-T (Diodes Incorporated): Extensive inventory (23,750 pcs). Operating range -65°C ~ 175°C. Forward voltage 1 V @ 1 A. Reverse recovery time 2 µs specified.
1N4004G (Rectron USA): AEC-Q101 automotive qualified. Lowest reverse leakage current (200 nA @ 400 V). Operating range -65°C ~ 175°C. Forward voltage 1 V @ 1 A.
1N4004-TP (Micro Commercial Co): Active status. Operating range -55°C ~ 150°C. Reverse recovery time 2 µs specified.
1N4004-E3/54 and 1N4004-E3/73 (Vishay): Active status. Operating range -55°C ~ 150°C.

Axial Package Equivalent:

1N4004RLG (onsemi): Maintains axial package format matching EU2 physical form factor. Marked "Not For New Designs" status. Operating range -65°C ~ 175°C. Reverse leakage 10 µA @ 400 V matches EU2 specification.

Compliance and Certification:

All listed substitute parts carry RoHS3 compliance. The 1N4004G variant includes AEC-Q101 automotive qualification. MSL rating of 1 (Unlimited) is consistent across all parts, indicating no moisture sensitivity constraints.

Product Status Considerations:

The 1N4004-T (Diodes Incorporated) is designated "Last Time Buy," indicating discontinued production. New designs should avoid this part number. The 1N4004RLG (onsemi) carries "Not For New Designs" status and should be used only for legacy system maintenance or replacement applications.

Frequently Asked Questions (FAQ)

Q: Can the EU2 be directly replaced with a 1N4004 series diode?

A: Yes. The 1N4004 series diodes listed meet the EU2 electrical specifications: 400V reverse voltage rating and 1A average rectified current. All are through-hole mounted general purpose rectifiers. The primary difference is package format: EU2 is axial, while most 1N4004 variants use DO-204AL (DO-41) package. Both package types are through-hole compatible with standard PCB layouts. The 1N4004RLG maintains axial format for direct mechanical substitution.

Q: What is the difference between fast recovery and standard recovery classifications?

A: The EU2 is specified as fast recovery with 400 ns reverse recovery time. Most substitute parts are standard recovery (> 500ns). In general purpose rectification circuits operating at line frequency (50/60 Hz), this difference has negligible impact on circuit performance. Fast recovery characteristics are critical in high-frequency switching applications. For standard AC rectification, standard recovery diodes are functionally equivalent.

Q: Which substitute part has the lowest forward voltage drop?

A: The 1N4004-T and 1N4004G both specify 1 V @ 1 A forward voltage, compared to the EU2 specification of 1.4 V @ 1 A. Lower forward voltage reduces power dissipation in the diode. The 1N4004GP-E3/54, 1N4004-E3/54, 1N4004-E3/73, 1N4004-TP, and 1N4004GP-TP all specify 1.1 V @ 1 A.

Q: Are there temperature range limitations when substituting?

A: The EU2 operates from -40°C to 150°C junction temperature. Most substitute parts extend this range to -55°C or -65°C minimum and 175°C maximum. For applications within the EU2 temperature envelope, all listed substitutes are compatible. Applications requiring operation below -40°C or above 150°C should select substitute parts with extended ratings (1N4004G, 1N4004G-T, 1N4004GP-E3/54, 1N4004GP-E3/73, 1N4004RLG).

Q: What is the significance of the 1N4004G automotive qualification?

A: The 1N4004G carries AEC-Q101 qualification, indicating compliance with automotive industry reliability and quality standards. This certification is relevant only for applications requiring automotive-grade components. For general industrial or consumer applications, AEC-Q101 qualification provides no functional advantage.

Q: Can I use a DO-41 package diode in place of an axial package diode?

A: DO-41 and axial packages are mechanically different but both are through-hole components. PCB layout and mechanical mounting must accommodate the different lead geometry. DO-41 uses two leads in a cylindrical plastic body, while axial uses two leads extending from opposite ends of a cylindrical component. Existing PCB designs with axial footprints require the 1N4004RLG (axial package) for direct substitution. New designs can use either package type.

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

A: The 1N4004G specifies 200 nA @ 400 V reverse leakage current, the lowest among all listed parts. The EU2 specifies 10 µA @ 400 V. Most other substitutes specify 5 µA @ 400 V. Lower reverse leakage is beneficial in high-impedance circuits or precision applications. For standard rectification, reverse leakage differences are not functionally significant.

Q: Should I avoid parts marked "Not For New Designs"?

A: Yes. The 1N4004RLG is marked "Not For New Designs," indicating the manufacturer has discontinued active development and support. This part should be used only for replacement or maintenance of existing systems. New circuit designs should select from parts with "Active" product status: 1N4004GP-E3/54, 1N4004G-T, 1N4004G, 1N4004-TP, 1N4004-E3/54, 1N4004-E3/73, or 1N4004GP-TP.

Q: What does RoHS3 compliance mean?

A: RoHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the component meets European Union environmental standards restricting lead, cadmium, mercury, and other hazardous substances. All listed substitute parts carry RoHS3 compliance, ensuring regulatory compatibility with modern manufacturing and disposal requirements.

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