1N5404-B Equivalent & Substitute Parts

Part Overview

The 1N5404-B is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 400 V DC reverse voltage and 3 A average rectified current in a DO-201AD through-hole axial package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing applications and new designs. Substitute parts are selected based on matching electrical ratings, mechanical compatibility, and thermal operating ranges to ensure functional equivalence in circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 3 A
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	10	µA @ 400 V
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 1N5404-B is determined by the following critical parameters:

Electrical Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Current - Average Rectified (Io): 3 A minimum
Operating Temperature - Junction: Must encompass or exceed -65°C to 150°C range

Mechanical Compatibility Criteria:

Mounting Type: Through Hole required
Package / Case: DO-201AD or DO-27 axial packages acceptable

Compliance Criteria:

RoHS Status: ROHS3 Compliant preferred for new designs
REACH Status: REACH Unaffected or REACH Affected acceptable

Substitute parts are grouped into two categories: direct electrical equivalents with identical or superior ratings, and functional alternatives that meet the core 400 V / 3 A specification within the specified thermal range. Parts with different recovery speeds (standard vs. fast recovery) are included where voltage and current ratings match, as recovery speed does not prevent functional substitution in general-purpose rectification applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	Ir @ Vr [µA]	Package	Tj Range [°C]	Product Status	RoHS
1N5404-B	Diodes Incorporated	400	3	1.0 @ 3A	Standard >500ns	10 @ 400V	DO-201AD	-65 to 150	Obsolete	ROHS3
1N5404G	onsemi	400	3	1.0 @ 3A	Standard >500ns	10 @ 400V	DO-201AA / DO-27	-65 to 150	Not For New Designs	ROHS3
1N5404RLG	onsemi	400	3	1.0 @ 3A	Standard >500ns	10 @ 400V	DO-201AA / DO-27	-65 to 150	Not For New Designs	ROHS3
1N5404-E3/54	Vishay General Semiconductor	400	3	1.2 @ 3A	Standard >500ns	5 @ 400V	DO-201AD	-50 to 150	Active	ROHS3
1N5404GP-AP	Micro Commercial Co	400	3	1.1 @ 3A	Standard >500ns	5 @ 400V	DO-201AD	-55 to 150	Active	ROHS3
1N5418	Microchip Technology	400	3	1.5 @ 9A	Fast ≤500ns	1 @ 400V	SQ-MELF	-65 to 175	Active	Non-compliant
1N6543	Microchip Technology	—	—	—	—	—	A-PKG	—	Active	Non-compliant
31GF4-E3/54	Vishay General Semiconductor	400	3	1.25 @ 3A	Fast ≤500ns	20 @ 400V	DO-201AD	-40 to 150	Active	ROHS3
31GF4-E3/73	Vishay General Semiconductor	400	3	1.25 @ 3A	Fast ≤500ns	20 @ 400V	DO-201AD	-40 to 150	Active	ROHS3
EGP30G	onsemi	400	3	1.25 @ 3A	Fast ≤500ns	5 @ 400V	DO-201AD	-65 to 150	Not For New Designs	ROHS3
HER305GA-G	Comchip Technology	400	3	1.3 @ 3A	Fast ≤500ns	5 @ 400V	DO-27	-55 to 150	Active	ROHS3

Engineering Selection Recommendations

For Active Product Status (Recommended for New Designs):

1N5404-E3/54 (Vishay General Semiconductor) and 1N5404GP-AP (Micro Commercial Co) are the primary recommendations for new designs. Both parts maintain the 400 V / 3 A electrical specification, are ROHS3 compliant, and carry Active product status. The 1N5404-E3/54 offers the closest electrical match to the original 1N5404-B with standard recovery characteristics and is available in DO-201AD packaging. The 1N5404GP-AP provides an alternative from a different manufacturer with similar specifications.

31GF4-E3/54 and 31GF4-E3/73 (Vishay General Semiconductor) are Active alternatives with fast recovery characteristics, suitable for applications where reduced reverse recovery time is beneficial. Both maintain ROHS3 compliance and the 400 V / 3 A rating in DO-201AD packaging.

HER305GA-G (Comchip Technology) is an Active alternative in DO-27 axial packaging, offering fast recovery performance and ROHS3 compliance. This part is suitable for applications where package form factor compatibility with DO-27 is acceptable.

For Existing Designs (Maintenance and Repair):

1N5404G and 1N5404RLG (onsemi) provide direct electrical equivalence to the 1N5404-B with identical voltage, current, and recovery characteristics. Both are ROHS3 compliant and available in DO-201AA / DO-27 packaging. These parts carry "Not For New Designs" status but remain suitable for replacement in existing applications.

EGP30G (onsemi) offers equivalent electrical performance with fast recovery characteristics and ROHS3 compliance. This part is classified as "Not For New Designs" but provides functional equivalence for maintenance applications.

Parts Not Recommended:

1N5418 (Microchip Technology) is not RoHS compliant and uses SQ-MELF surface-mount packaging, which is mechanically incompatible with through-hole applications requiring DO-201AD or DO-27 packages.

1N6543 (Microchip Technology) lacks complete electrical parameter documentation and is not RoHS compliant, making it unsuitable for selection without additional verification.

Frequently Asked Questions (FAQ)

Q: Can 1N5404-E3/54 directly replace 1N5404-B in existing circuits?

A: Yes. The 1N5404-E3/54 maintains identical voltage (400 V) and current (3 A) ratings, operates within the same temperature range (-50°C to 150°C encompasses the original -65°C to 150°C at the upper end), and is packaged in DO-201AD. The forward voltage specification (1.2 V @ 3 A) is slightly higher than the original (1.0 V @ 3 A), but this difference is within acceptable tolerance for general-purpose rectification applications.

Q: What is the difference between standard recovery and fast recovery diodes in this product category?

A: Standard recovery diodes (1N5404-B, 1N5404G, 1N5404RLG, 1N5404-E3/54, 1N5404GP-AP) have reverse recovery times exceeding 500 ns. Fast recovery diodes (31GF4-E3/54, 31GF4-E3/73, EGP30G, HER305GA-G) have reverse recovery times of 30 to 50 ns. Both types meet the 400 V / 3 A specification and are functionally interchangeable in general-purpose rectification circuits. Fast recovery variants reduce switching losses in high-frequency applications.

Q: Are DO-201AA and DO-27 packages mechanically compatible with DO-201AD?

A: DO-201AA and DO-27 are equivalent axial through-hole packages with identical lead spacing and form factor. Parts specified for DO-201AA / DO-27 (such as 1N5404G and 1N5404RLG) are mechanically compatible with circuits designed for DO-201AD. The original 1N5404-B is specified as DO-201AD, which is the same package family.

Q: Why is 1N5418 listed as a substitute if it uses SQ-MELF packaging?

A: The 1N5418 appears in the provided substitute list for the 1N5404-B but is not recommended for direct substitution due to its SQ-MELF surface-mount package, which is mechanically incompatible with through-hole applications. This part is included in the comparison table for reference only and should not be selected for replacement of through-hole mounted 1N5404-B components.

Q: What does "Not For New Designs" product status mean?

A: "Not For New Designs" indicates that the manufacturer has discontinued active development and support for the part, though existing inventory may remain available. These parts (1N5404G, 1N5404RLG, EGP30G) are suitable for maintenance and repair of existing equipment but should not be specified for new product development. Active status parts (1N5404-E3/54, 1N5404GP-AP, 31GF4-E3/54, 31GF4-E3/73, HER305GA-G) are preferred for new designs.

Q: Is RoHS compliance a critical factor in selecting a substitute?

A: RoHS3 compliance is mandatory for products sold in regulated markets and is a standard requirement for new designs. All recommended substitutes (1N5404-E3/54, 1N5404GP-AP, 31GF4-E3/54, 31GF4-E3/73, EGP30G, HER305GA-G) are ROHS3 compliant. Parts that are not RoHS compliant (1N5418, 1N6543) should be avoided unless the application explicitly permits non-compliant components.

Q: Can I use 31GF4-E3/54 as a direct replacement for 1N5404-B?

A: Yes, with the following considerations: The 31GF4-E3/54 maintains the 400 V / 3 A electrical specification and DO-201AD packaging. It offers fast recovery characteristics (30 ns reverse recovery time) compared to the standard recovery of the original part. The operating temperature range is -40°C to 150°C, which is narrower than the original -65°C to 150°C at the lower end. For applications operating above -40°C, this part is a direct functional replacement. For applications requiring operation below -40°C, the 1N5404-E3/54 or 1N5404GP-AP are preferred.

Q: What is the significance of reverse leakage current (Ir) differences among substitute parts?

A: Reverse leakage current (Ir) represents the small current flowing through the diode in reverse bias. The 1N5404-B specifies 10 µA @ 400 V. Substitute parts range from 1 µA (1N5418) to 20 µA (31GF4-E3/54, 31GF4-E3/73). Lower leakage current indicates better reverse blocking performance and lower power dissipation in reverse bias. Differences in this range do not prevent functional substitution in general-purpose rectification applications.

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