AU02 Equivalent & Substitute Parts

Part Overview

The AU02 is a general-purpose rectifier diode manufactured by Sanken Electric USA Inc., rated for 400 V DC reverse voltage and 800 mA average rectified current. This through-hole axial package diode operates across a junction temperature range of -40°C to 150°C and features fast recovery characteristics with a reverse recovery time of 400 ns. The part is RoHS compliant and currently active in production with 1077 pieces in stock.

Substitute parts are necessary when the AU02 becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for compatible electrical parameters within the same application class. The substitute parts listed maintain electrical compatibility through equivalent voltage and current ratings while offering variations in recovery speed, packaging, and temperature ranges.

Key Parameters

Parameter	AU02 Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	800	mA
Voltage - Forward (Vf) (Max) @ If	1.3 @ 800 mA	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	-
Reverse Recovery Time (trr)	400	ns
Current - Reverse Leakage @ Vr	10 @ 400 V	µA
Mounting Type	Through Hole	-
Package / Case	Axial	-
Operating Temperature - Junction	-40 to 150	°C
RoHS Status	RoHS Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the AU02 is determined by the following critical electrical parameters:

Voltage Rating Compatibility: All substitute parts maintain the 400 V DC reverse voltage maximum, ensuring equivalent reverse bias protection in the circuit.

Current Rating Compatibility: Substitute parts are grouped into two categories based on current handling:

Higher Current Capacity (1 A): Parts rated for 1 A average rectified current exceed the AU02's 800 mA specification, providing design margin and interchangeability in applications where the AU02 is specified.
Matching Current Capacity (800 mA): Parts with identical 800 mA ratings provide direct functional equivalence.

Recovery Speed Classification: The AU02 is classified as fast recovery (≤ 500 ns). Substitute parts are available in both fast recovery and standard recovery (> 500 ns) categories. Standard recovery substitutes are electrically compatible but exhibit different switching characteristics suitable for lower-frequency applications.

Package and Mounting: All substitute parts use through-hole mounting in axial or DO-41 package formats, maintaining mechanical compatibility with the AU02's footprint and assembly process.

Temperature Range: The AU02 operates from -40°C to 150°C. Substitute parts offer extended ranges (-55°C to 175°C or -65°C to 175°C), providing thermal margin in demanding environments.

Compliance and Status: All substitute parts are RoHS3 compliant or RoHS compliant, with MSL ratings of 1 (Unlimited), matching the AU02's environmental specifications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (mA)	Vf (Max) @ If	Speed	trr (ns)	Ir @ Vr (µA)	Package	Tj Range (°C)	Status
AU02	Sanken Electric USA Inc.	400	800	1.3 @ 800 mA	Fast Recovery ≤ 500ns	400	10 @ 400 V	Axial	-40 to 150	Active
1N4004-E3/54	Vishay General Semiconductor	400	1000	1.1 @ 1 A	Standard Recovery > 500ns	-	5 @ 400 V	DO-204AL (DO-41)	-55 to 150	Active
1N4004-E3/73	Vishay General Semiconductor	400	1000	1.1 @ 1 A	Standard Recovery > 500ns	-	5 @ 400 V	DO-204AL (DO-41)	-55 to 150	Active
1N4004-T	Diodes Incorporated	400	1000	1.0 @ 1 A	Standard Recovery > 500ns	-	5 @ 400 V	DO-204AL (DO-41)	-65 to 150	Last Time Buy
1N4004-TP	Micro Commercial Co	400	1000	1.1 @ 1 A	Standard Recovery > 500ns	2000	5 @ 400 V	DO-204AL (DO-41)	-55 to 150	Active
1N4004G	Rectron USA	400	1000	1.0 @ 1 A	Standard Recovery > 500ns	-	0.2 @ 400 V	DO-204AL (DO-41)	-65 to 175	Active
1N4004G-T	Diodes Incorporated	400	1000	1.0 @ 1 A	Standard Recovery > 500ns	2000	5 @ 400 V	DO-204AL (DO-41)	-65 to 175	Active
1N4004GP-E3/54	Vishay General Semiconductor	400	1000	1.1 @ 1 A	Standard Recovery > 500ns	2000	5 @ 400 V	DO-204AL (DO-41)	-65 to 175	Active
1N4004GP-E3/73	Vishay General Semiconductor	400	1000	1.1 @ 1 A	Standard Recovery > 500ns	2000	5 @ 400 V	DO-204AL (DO-41)	-65 to 175	Active
1N4004GP-TP	Micro Commercial Co	400	1000	1.1 @ 1 A	Standard Recovery > 500ns	2000	5 @ 400 V	DO-204AL (DO-41)	-55 to 150	Active
1N4004RLG	onsemi	400	1000	1.1 @ 1 A	Standard Recovery > 500ns	-	10 @ 400 V	DO-204AL (DO-41)	-65 to 175	Not For New Designs

Engineering Selection Recommendations

For Active Production Designs:

Select from parts with Active product status: 1N4004-E3/54, 1N4004-E3/73, 1N4004-TP, 1N4004G, 1N4004G-T, 1N4004GP-E3/54, 1N4004GP-E3/73, or 1N4004GP-TP. These parts maintain full manufacturer support and availability.

For Extended Temperature Applications:

Parts rated for -65°C to 175°C (1N4004-T, 1N4004G, 1N4004G-T, 1N4004GP-E3/54, 1N4004GP-E3/73, 1N4004RLG) provide thermal margin beyond the AU02's -40°C to 150°C range. The 1N4004G variant from Rectron USA offers AEC-Q101 automotive qualification for applications requiring automotive-grade reliability.

For Packaging Flexibility:

The 1N4004 series is available in multiple packaging formats (Cut Tape, Tape & Box, Tape & Reel) across multiple manufacturers, enabling selection based on procurement and assembly requirements while maintaining electrical equivalence.

For RoHS3 Compliance:

All substitute parts carry ROHS3 Compliant or RoHS Compliant status, meeting current environmental regulations. The AU02 is RoHS Compliant; upgrade to ROHS3 Compliant parts (1N4004-E3/54, 1N4004-E3/73, 1N4004-T, 1N4004-TP, 1N4004G, 1N4004G-T, 1N4004GP-E3/54, 1N4004GP-E3/73, 1N4004GP-TP, 1N4004RLG) for future-proofed designs.

For Discontinued Part Replacement:

The 1N4004-T from Diodes Incorporated carries Last Time Buy status. For long-term supply assurance, select from the broader 1N4004 family with Active status.

Avoid for New Designs:

The 1N4004RLG from onsemi is marked Not For New Designs. Use this part only for legacy system maintenance or repair applications.

Frequently Asked Questions (FAQ)

Q: Can I substitute the AU02 with a 1 A rated 1N4004 series diode in my 800 mA application?

A: Yes. The 1N4004 series diodes rated for 1 A average rectified current are electrically compatible with the AU02's 800 mA specification. The higher current rating provides design margin and does not degrade circuit performance. All 1N4004 variants maintain the 400 V reverse voltage rating and through-hole axial or DO-41 package compatibility.

Q: What is the difference between fast recovery and standard recovery diodes in the AU02 substitution options?

A: The AU02 is classified as fast recovery with a 400 ns reverse recovery time. Most 1N4004 substitutes are standard recovery (> 500 ns). Fast recovery diodes switch more quickly, reducing switching losses in high-frequency applications. Standard recovery diodes are suitable for lower-frequency rectification circuits. Selection depends on circuit operating frequency; if the original design specified fast recovery, verify that standard recovery substitutes do not introduce unacceptable switching losses.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are either RoHS Compliant or ROHS3 Compliant. The AU02 is RoHS Compliant. For new designs, ROHS3 Compliant parts (1N4004-E3/54, 1N4004-E3/73, 1N4004-T, 1N4004-TP, 1N4004G, 1N4004G-T, 1N4004GP-E3/54, 1N4004GP-E3/73, 1N4004GP-TP, 1N4004RLG) provide enhanced environmental compliance.

Q: Can I use the 1N4004G in automotive applications?

A: Yes. The 1N4004G from Rectron USA carries AEC-Q101 automotive qualification and is rated for -65°C to 175°C junction temperature operation. This part is suitable for automotive and high-reliability applications requiring qualified components.

Q: What packaging options are available for the 1N4004 substitute series?

A: The 1N4004 series is available in Cut Tape (CT), Tape & Box (TB), and Tape & Reel (TR) packaging formats across multiple manufacturers. All variants maintain the same electrical specifications and through-hole axial or DO-41 package footprint. Select packaging based on procurement volume and assembly process requirements.

Q: Is the 1N4004RLG suitable for new product designs?

A: No. The 1N4004RLG from onsemi is marked Not For New Designs. This part is available for legacy system maintenance and repair only. For new designs, select from parts with Active product status.

Q: How do I verify that a substitute part is compatible with my circuit?

A: Verify compatibility by confirming: (1) Reverse voltage rating is equal to or greater than the AU02's 400 V; (2) Average rectified current rating is equal to or greater than the circuit's maximum forward current; (3) Forward voltage drop at the operating current does not exceed circuit design limits; (4) Operating temperature range encompasses the circuit's thermal environment; (5) Package and mounting type match the PCB footprint and assembly process.

Q: What is the difference between the Vishay 1N4004GP-E3/54 and 1N4004GP-E3/73 parts?

A: Both parts are electrically identical 1N4004GP variants from Vishay General Semiconductor with identical electrical specifications. The difference is in packaging: E3/54 is supplied in Cut Tape (CT) format, while E3/73 is supplied in Tape & Box (TB) format. Select based on procurement and assembly requirements.

Q: Can I use the 1N4004G with extended temperature range (-65°C to 175°C) in place of the AU02 (-40°C to 150°C)?

A: Yes. The 1N4004G's extended temperature range is a superset of the AU02's range. The part is electrically compatible and provides thermal margin for applications operating at temperature extremes. No circuit modifications are required.

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