1N5403 Equivalent & Substitute Parts

Part Overview

The 1N5403 is a general-purpose rectifier diode manufactured by onsemi, rated for 300 V DC reverse voltage and 3 A average rectified current in a through-hole DO-201AD axial package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The 1N5403 operates across a junction temperature range of -55°C to 150°C and is suitable for standard recovery rectification applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	300	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 3 A	V
Speed	Standard Recovery >500ns, > 200mA (Io)	-
Current - Reverse Leakage @ Vr	5	µA @ 300 V
Mounting Type	Through Hole	-
Package / Case	DO-201AD, Axial	-
Operating Temperature - Junction	-55°C to 150°C	°C

Substitute Part Grouping Explanation

Substitute parts for the 1N5403 are grouped based on strict electrical and mechanical compatibility criteria. All substitute parts must meet or exceed the following key parameters:

Voltage - DC Reverse (Vr) (Max): 300 V minimum
Current - Average Rectified (Io): 3 A minimum
Mounting Type: Through Hole
Operating Temperature - Junction: -55°C to 150°C minimum range

Substitutes are categorized into two groups:

Group 1: Parametric Equivalents (Same Package DO-201AD) Parts that maintain the original DO-201AD package and match all primary electrical specifications, including forward voltage and recovery speed characteristics.

Group 2: Functional Equivalents (Alternative Package DO-27) Parts that meet all electrical requirements but use the DO-27 package variant (DO-201AA), which is mechanically compatible with DO-201AD in through-hole applications. These parts feature improved recovery characteristics (fast recovery ≤500ns) compared to the standard recovery specification of the original part.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 3A [V]	Speed	Reverse Leakage @ 300V [µA]	Package	Temp Range [°C]	Product Status
1N5403	onsemi	300	3	1.2	Standard Recovery >500ns	5	DO-201AD	-55 to 150	Obsolete
1N5403-E3/54	Vishay General Semiconductor	300	3	1.2	Standard Recovery >500ns	5	DO-201AD	-55 to 150	Active
UF5403-E3/54	Vishay General Semiconductor	300	3	1.0	Fast Recovery ≤500ns	10	DO-201AD	-55 to 150	Active
HER304GA-G	Comchip Technology	300	3	1.0	Fast Recovery ≤500ns	5	DO-27	-55 to 150	Active
HER304GT-G	Comchip Technology	300	3	1.0	Fast Recovery ≤500ns	5	DO-27	-55 to 150	Active
UF3004-G	Comchip Technology	300	3	1.3	Fast Recovery ≤500ns	5	DO-27	-55 to 125	Active
UF3004-HF	Comchip Technology	300	3	1.3	Fast Recovery ≤500ns	5	DO-27	-55 to 125	Active

Engineering Selection Recommendations

Primary Recommendation: 1N5403-E3/54 (Vishay General Semiconductor)

The 1N5403-E3/54 is the direct parametric equivalent to the obsolete 1N5403. This part maintains identical electrical specifications including forward voltage (1.2 V @ 3 A), standard recovery speed (>500ns), and reverse leakage current (5 µA @ 300 V). The part is housed in the same DO-201AD package and operates across the full -55°C to 150°C temperature range. The 1N5403-E3/54 carries active product status and ROHS3 compliance, making it suitable for new designs and production continuity.

Secondary Recommendation: UF5403-E3/54 (Vishay General Semiconductor)

The UF5403-E3/54 provides an active alternative in the DO-201AD package with improved fast recovery characteristics (≤500ns). This part features lower forward voltage (1.0 V @ 3 A) compared to the original specification, resulting in reduced power dissipation. The UF5403-E3/54 maintains the same temperature range (-55°C to 150°C) and package format. ROHS3 compliance is included.

Tertiary Recommendations: HER304GA-G and HER304GT-G (Comchip Technology)

Both HER304GA-G and HER304GT-G are functionally equivalent alternatives using the DO-27 package. These parts meet all electrical requirements with fast recovery characteristics (≤500ns) and forward voltage of 1.0 V @ 3 A. The primary difference between these two parts is packaging format: HER304GA-G is supplied in Tape & Box (TB) format, while HER304GT-G is supplied in Tape & Reel (TR) format. Both maintain the -55°C to 150°C operating range and carry ROHS3 compliance.

Alternative Options: UF3004-G and UF3004-HF (Comchip Technology)

The UF3004-G and UF3004-HF parts are functionally equivalent in the DO-27 package with fast recovery characteristics. These parts feature higher forward voltage (1.3 V @ 3 A) and operate across a reduced temperature range (-55°C to 125°C). Both carry ROHS3 compliance and are supplied in bulk packaging.

All recommended substitutes maintain REACH Unaffected status and EAR99 ECCN classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can the 1N5403 be directly replaced with the 1N5403-E3/54?

A: Yes. The 1N5403-E3/54 is a parametric equivalent with identical electrical specifications and the same DO-201AD package. This is the recommended direct replacement for obsolete 1N5403 applications.

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

A: Both DO-201AD and DO-27 are axial through-hole packages formats for diodes. DO-27 is an alternative designation for the same physical package (DO-201AA). Parts specified in either package are mechanically compatible in through-hole PCB applications.

Q: Why do some substitutes have faster recovery times than the original 1N5403?

A: The original 1N5403 specifies standard recovery (>500ns). Several active substitutes feature fast recovery (≤500ns) characteristics. Fast recovery diodes have lower reverse recovery time, which reduces switching losses and improves efficiency in rectification circuits. These parts are fully compatible with applications designed for standard recovery diodes.

Q: What is the significance of forward voltage differences between substitutes?

A: Forward voltage (Vf) affects power dissipation in the diode. The original 1N5403 specifies 1.2 V @ 3 A. Substitutes with lower forward voltage (1.0 V) dissipate less power, while those with higher forward voltage (1.3 V) dissipate more. Selection depends on thermal management requirements and circuit design specifications.

Q: Are all recommended substitutes RoHS compliant?

A: Yes. All active substitute parts listed carry ROHS3 compliance. The original 1N5403 does not specify RoHS status due to its obsolete classification.

Q: What is the difference between HER304GA-G and HER304GT-G?

A: Both parts are electrically identical with the same specifications. The difference is packaging format: HER304GA-G is supplied in Tape & Box (TB) format, while HER304GT-G is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements and inventory management preferences.

Q: Can UF3004-G and UF3004-HF be used in high-temperature applications?

A: The UF3004-G and UF3004-HF parts operate to a maximum junction temperature of 125°C, which is 25°C lower than the original 1N5403 specification of 150°C. These parts are not suitable for applications requiring the full -55°C to 150°C temperature range. Use HER304GA-G, HER304GT-G, UF5403-E3/54, or 1N5403-E3/54 for full temperature range compatibility.

Q: What inventory levels are available for each substitute?

A: Current inventory levels are provided in the part specifications. The 1N5403-E3/54 has 1500 pieces in stock, UF5403-E3/54 has 3237 pieces, HER304GA-G has 645 pieces, HER304GT-G has 879 pieces, UF3004-G has 944 pieces, and UF3004-HF has 901 pieces.

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