EU02 General Purpose Rectifier Diode 400V 1A Equivalent & Substitute Parts

Part Overview

The EU02 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 in current 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	EU02 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 EU02 are qualified based on the following critical parameters that determine functional equivalence:

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: All identified substitute parts maintain the core electrical ratings of 400V reverse voltage and 1A average rectified current. Substitute parts are grouped into two categories based on recovery speed classification:

Standard Recovery Diodes (>500ns): Parts with standard recovery characteristics including 1N4004-E3/54, 1N4004-E3/73, 1N4004-T, 1N4004-TP, 1N4004G, 1N4004G-T, 1N4004GP-E3/54, 1N4004GP-E3/73, 1N4004GP-TP, and 1N4004RLG. These parts operate within the same voltage and current envelope with extended recovery times suitable for general purpose applications.
Axial Package Variants: The 1N4004RLG maintains the axial package format identical to the EU02, while other substitutes utilize DO-204AL (DO-41) package formats that are mechanically compatible through-hole alternatives.

Forward voltage characteristics vary across substitutes (ranging from 1.0V to 1.1V @ 1A), all within acceptable operating margins relative to the EU02 specification of 1.4V @ 1A. Reverse leakage current specifications range from 5µA to 200nA @ 400V, representing improved performance characteristics in substitute options.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	trr	Ir @ Vr	Package	Temp Range	Product Status
EU02	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	1.0 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	1.0 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	1.0 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

Primary Substitute - Axial Package Compatibility: The 1N4004RLG (onsemi) is the direct axial package equivalent to the EU02. Both components utilize identical axial through-hole packaging, enabling direct mechanical substitution in existing PCB layouts. The 1N4004RLG maintains 400V reverse voltage and 1A average rectified current specifications. However, the 1N4004RLG carries a product status of "Not For New Designs," indicating this part is in end-of-life phase. For new designs requiring axial package format, alternative sourcing strategies should be evaluated.

Active Production Alternatives - DO-204AL (DO-41) Package: For applications where package format flexibility exists, the following parts are recommended based on active product status and compliance certifications:

1N4004GP-E3/54 and 1N4004GP-E3/73 (Vishay General Semiconductor): Both parts are active production items with ROHS3 compliance and extended operating temperature range (-65°C ~ 175°C). These SUPERECTIFIER® series components offer improved reverse leakage characteristics (5µA @ 400V) and documented reverse recovery time (2µs). High inventory availability (40,609 and 3,200 units respectively) supports supply chain continuity.
1N4004G-T (Diodes Incorporated): Active production status with extended temperature range (-65°C ~ 175°C) and ROHS3 compliance. Offers lowest forward voltage (1.0V @ 1A) among standard recovery options. Highest inventory availability (23,750 units) provides supply security.
1N4004G (Rectron USA): Active production with AEC-Q101 automotive qualification and extended temperature range (-65°C ~ 175°C). Lowest reverse leakage current (200nA @ 400V) among all substitutes. Suitable for applications requiring automotive-grade reliability.

Compliance Considerations: All recommended substitute parts maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the EU02 environmental specifications. REACH status is either "Unaffected" or "info available upon request" across all substitutes, indicating regulatory compliance.

Product Status Evaluation: The 1N4004-T (Diodes Incorporated) carries "Last Time Buy" status, indicating limited availability window. This part should be avoided for new designs or long-term production commitments. All other recommended substitutes maintain active production status.

Frequently Asked Questions (FAQ)

Q: Can the EU02 be directly replaced with the 1N4004RLG in existing designs?

A: Yes. Both the EU02 and 1N4004RLG utilize axial through-hole packaging and maintain identical 400V reverse voltage and 1A average rectified current specifications. Direct mechanical and electrical substitution is supported. However, the 1N4004RLG is designated "Not For New Designs," so this substitution is appropriate only for legacy system maintenance or repair applications.

Q: What is the primary difference between the EU02 and DO-204AL (DO-41) package alternatives?

A: The EU02 uses axial through-hole packaging, while substitute parts such as 1N4004GP-E3/54 and 1N4004G-T use DO-204AL (DO-41) package format. Both are through-hole mounting types with identical lead spacing and PCB hole diameter compatibility. The primary difference is lead orientation: axial leads extend from opposite ends of the component body, while DO-41 leads extend from the same end. PCB layout modifications are required to accommodate DO-41 format.

Q: How do forward voltage differences affect circuit performance?

A: The EU02 specifies 1.4V forward voltage @ 1A, while most substitutes specify 1.0V to 1.1V @ 1A. Lower forward voltage in substitute parts results in reduced power dissipation and improved efficiency. In rectifier circuits, this difference is typically non-critical for general purpose applications. Circuit designers should verify that lower forward voltage does not introduce unintended effects in voltage regulation or threshold-dependent circuits.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts maintain either RoHS or ROHS3 compliance status, matching the EU02 RoHS Compliant designation. This ensures compatibility with RoHS-regulated supply chains and end-use applications.

Q: What is the significance of reverse recovery time (trr) differences?

A: The EU02 specifies 400ns fast recovery time, while most substitute parts are classified as standard recovery (>500ns). Fast recovery diodes exhibit shorter reverse recovery time, reducing switching losses in high-frequency applications. Standard recovery diodes are suitable for 50/60Hz line frequency rectification and general purpose applications where switching speed is not performance-critical. Application frequency requirements determine whether fast or standard recovery classification is appropriate.

Q: Which substitute offers the best reverse leakage performance?

A: The 1N4004G (Rectron USA) offers the lowest reverse leakage current at 200nA @ 400V, compared to the EU02 specification of 10µA @ 400V. This represents a 50-fold improvement in leakage performance. Lower reverse leakage is beneficial in high-impedance circuits and precision analog applications. The 1N4004G also carries AEC-Q101 automotive qualification, indicating enhanced reliability screening.

Q: Can substitute parts be used interchangeably in production?

A: Mechanical interchangeability depends on package format. Axial package parts (EU02, 1N4004RLG) are directly interchangeable. DO-204AL (DO-41) package parts require PCB layout modification. Electrical interchangeability is supported across all substitutes for general purpose rectification applications. Production qualification and design validation are required before implementing any substitute part in manufacturing.

Q: What is the operating temperature range consideration for substitute selection?

A: The EU02 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. Extended temperature range provides design margin for thermal stress conditions but is not required for standard industrial applications operating within -40°C to 150°C envelope. Temperature range selection should align with specific application thermal requirements.

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