1N5404RLG Equivalent & Substitute Parts

Part Overview

The 1N5404RLG is a general-purpose rectifier diode manufactured by onsemi, rated for 400 V DC reverse voltage and 3 A average rectified current. This component is classified as a through-hole axial diode in the DO-201AA/DO-27 package family. The part is designated as "Not For New Designs," indicating it is a legacy component. Identifying equivalent and substitute parts is necessary for applications requiring continued supply, design flexibility, or alternative sourcing options while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.0	V @ 3 A
Speed	Standard Recovery >500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	10	µA @ 400 V
Mounting Type	Through Hole	—
Package / Case	DO-201AA, DO-27, Axial	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the 1N5404RLG are grouped based on strict electrical and mechanical compatibility criteria. All substitute diodes must meet or exceed the following parameters:

Critical Substitution Parameters:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Current - Average Rectified (Io): 3 A minimum
Mounting Type: Through Hole
Package / Case: DO-201AA, DO-27, or DO-201AD (axial configurations)
Operating Temperature Range: Must encompass the application's required junction temperature range

Acceptable Variations:

Forward voltage (Vf) may vary within standard rectifier specifications
Recovery speed (Standard or Fast Recovery) is acceptable
Reverse leakage current may be lower than the original specification
Capacitance values are not critical for general-purpose rectification

Substitutes are organized into two categories: direct equivalents from onsemi (same base product number with different packaging) and cross-manufacturer alternatives meeting identical electrical ratings.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ If	Speed	Package	Product Status
1N5404RLG	onsemi	400	3	1.0 V @ 3 A	Standard Recovery >500ns	DO-201AA, DO-27	Not For New Designs
1N5404G	onsemi	400	3	1.0 V @ 3 A	Standard Recovery >500ns	DO-201AA, DO-27	Not For New Designs
EGP30G	onsemi	400	3	1.25 V @ 3 A	Fast Recovery ≤500ns	DO-201AD	Not For New Designs
1N5404-E3/54	Vishay General Semiconductor - Diodes Division	400	3	1.2 V @ 3 A	Standard Recovery >500ns	DO-201AD	Active
1N5404G-T	Diodes Incorporated	400	3	1.1 V @ 3 A	Standard Recovery >500ns	DO-201AD	Active
31GF4-E3/54	Vishay General Semiconductor - Diodes Division	400	3	1.25 V @ 3 A	Fast Recovery ≤500ns	DO-201AD	Active
31GF4-E3/73	Vishay General Semiconductor - Diodes Division	400	3	1.25 V @ 3 A	Fast Recovery ≤500ns	DO-201AD	Active
HER305GA-G	Comchip Technology	400	3	1.3 V @ 3 A	Fast Recovery ≤500ns	DO-201AA, DO-27	Active
HER305GT-G	Comchip Technology	400	3	1.3 V @ 3 A	Fast Recovery ≤500ns	DO-201AA, DO-27	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

The 1N5404G (onsemi, Bulk packaging) is the direct equivalent to 1N5404RLG, differing only in packaging format. Both share identical electrical specifications and the same "Not For New Designs" status. Selection between these two depends on inventory packaging requirements (Cut Tape versus Bulk).

For Active Product Status Designs:

When designing new applications or requiring long-term supply assurance, the following active-status alternatives are recommended:

1N5404-E3/54 (Vishay): Maintains standard recovery characteristics and identical 400 V / 3 A ratings. Operating temperature range is -50°C to 150°C (narrower than the original -65°C to 150°C). ROHS3 compliant.
1N5404G-T (Diodes Incorporated): Offers the lowest forward voltage (1.1 V @ 3 A) among active alternatives, reducing power dissipation. Maintains standard recovery speed and full -65°C to 150°C operating range. ROHS3 compliant with MSL 1 rating.
31GF4-E3/54 and 31GF4-E3/73 (Vishay): Provide fast recovery characteristics (≤500ns, 30 ns trr) with identical voltage and current ratings. Operating temperature range is -40°C to 150°C. Both are ROHS3 compliant with MSL 1 rating.

For Package-Specific Requirements:

HER305GA-G and HER305GT-G (Comchip Technology): Maintain the original DO-27 package format with fast recovery performance. Both are active products with ROHS3 compliance and MSL 1 rating. Operating temperature range is -55°C to 150°C.

Compliance Considerations:

All listed substitutes are ROHS3 compliant and REACH unaffected, meeting modern environmental and regulatory requirements. Parts designated as "Active" provide superior long-term availability and supply chain stability compared to the "Not For New Designs" status of the original 1N5404RLG.

Frequently Asked Questions (FAQ)

Q: Can I use a 1N5404G-T as a direct replacement for 1N5404RLG in existing designs?

A: Yes. Both parts share identical electrical ratings (400 V, 3 A, standard recovery). The 1N5404G-T is manufactured by Diodes Incorporated and is actively produced, making it suitable for both replacement and new designs. The lower forward voltage (1.1 V versus 1.0 V) results in slightly reduced power dissipation, which is beneficial in most applications.

Q: What is the difference between DO-201AA, DO-27, and DO-201AD packages?

A: All three are axial through-hole packages for rectifier diodes. DO-201AA and DO-27 are equivalent designations for the same physical package. DO-201AD is a variant with slightly different dimensional specifications. Parts specified for DO-201AA/DO-27 are mechanically compatible with each other. DO-201AD parts have identical mounting characteristics but may have minor lead geometry differences. Verify PCB footprint compatibility when switching between package types.

Q: Why do some substitutes have "Fast Recovery" while the original has "Standard Recovery"?

A: Recovery speed refers to how quickly the diode transitions from conducting to blocking state. Standard recovery (>500ns) is suitable for general-purpose rectification at line frequencies (50/60 Hz). Fast recovery (≤500ns) provides improved performance in switching applications and higher-frequency circuits. Fast recovery diodes are backward compatible with standard recovery applications, offering superior performance without functional incompatibility.

Q: Is the 1N5404RLG still available for purchase?

A: The 1N5404RLG is designated "Not For New Designs" by onsemi, indicating it is a legacy product. However, inventory of 16,846 pieces is currently in stock. For new designs or long-term supply assurance, active alternatives such as 1N5404-E3/54, 1N5404G-T, or 31GF4-E3/54 are recommended.

Q: Can I use HER505GP-AP or HER505GP-TP as substitutes?

A: No. These parts are rated for 5 A average rectified current, exceeding the 3 A specification of the 1N5404RLG. While they share the same 400 V reverse voltage rating and through-hole axial package, they are not equivalent substitutes. Using a higher-current-rated diode in a 3 A application is not problematic from a functional standpoint, but it introduces unnecessary cost and may not fit the original PCB footprint due to different lead gauges.

Q: What is the significance of the "Not For New Designs" status?

A: This designation indicates that the manufacturer (onsemi) is not recommending the part for new circuit designs. The part remains available and functional, but the manufacturer prioritizes newer alternatives for future development. For maintenance, repair, or replacement of existing equipment, the 1N5404RLG remains a valid choice. For new product development, active alternatives provide better long-term support and supply chain stability.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All substitute parts listed in this document are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components in the European Union and other regulated markets.

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