HER301-T Equivalent & Substitute Parts

Part Overview

The HER301-T is a general-purpose rectifier diode rated for 50 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. Manufactured by Diodes Incorporated, this component is classified as obsolete. Due to its obsolete status and limited availability, equivalent substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 3 A	V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	10	µA @ 50 V
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-65°C ~ 150°C	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the HER301-T are selected based on strict electrical and mechanical parameter matching. The critical parameters that determine substitution eligibility are:

Voltage Rating: Minimum 50 V DC reverse voltage (Vr)
Current Rating: Minimum 3 A average rectified current (Io)
Package Type: DO-201AD or equivalent axial through-hole configuration
Forward Voltage: Maximum 1.1 V @ 3 A or lower
Recovery Characteristics: Fast recovery (≤ 500ns) or standard recovery (> 500ns) depending on application requirements
Temperature Range: Operating junction temperature range of -65°C to 150°C or broader
Compliance: ROHS3 compliance for environmental standards

Substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalents (Fast Recovery) Parts with fast recovery characteristics (≤ 500ns) matching the HER301-T specification. These include UF5400-E3/73 and HER301T/R.

Category 2: Functional Equivalents (Standard Recovery) Parts with standard recovery characteristics (> 500ns) that meet or exceed all other electrical parameters. These include 1N5400-E3/54, 1N5400G, GP30A-E3/54, and 1N5400RLG.

Category 3: Partial Equivalents (Current Derating) Parts with lower current ratings (1 A) that do not meet the 3 A requirement. The 1N5802 is excluded from primary substitution consideration due to current rating mismatch.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	trr [ns]	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status	RoHS
HER301-T	Diodes Incorporated	50	3	1.1 @ 3A	Fast Recovery ≤ 500ns	50	10 @ 50V	DO-201AD	-65 ~ 150	Obsolete	ROHS3
1N5400-E3/54	Vishay	50	3	1.2 @ 3A	Standard Recovery > 500ns	—	5 @ 50V	DO-201AD	-50 ~ 150	Active	ROHS3
1N5400G	Taiwan Semiconductor	50	3	1.1 @ 3A	Standard Recovery > 500ns	—	5 @ 50V	DO-201AD	-55 ~ 150	Active	ROHS3
1N5400RLG	onsemi	50	3	1.0 @ 3A	Standard Recovery > 500ns	—	10 @ 50V	DO-201AA / DO-27	-65 ~ 150	Not For New Designs	ROHS3
1N5415	Microchip Technology	50	3	1.5 @ 9A	Fast Recovery ≤ 500ns	150	1 @ 50V	B, Axial	-65 ~ 175	Active	Non-compliant
1N5802	Microchip Technology	50	1	0.875 @ 1A	Fast Recovery ≤ 500ns	25	1 @ 50V	A, Axial	-65 ~ 175	Active	Non-compliant
GP30A-E3/54	Vishay	50	3	1.2 @ 3A	Standard Recovery > 500ns	5000	5 @ 50V	DO-201AD	-65 ~ 175	Active	ROHS3
UF5400-E3/73	Vishay	50	3	1.0 @ 3A	Fast Recovery ≤ 500ns	50	10 @ 50V	DO-201AD	-55 ~ 150	Active	ROHS3
HER301T/R	EIC Semiconductor	50	3	1.1 @ 3A	Fast Recovery ≤ 500ns	50	10 @ 50V	DO-201AD	-65 ~ 150	Active	ROHS3

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Status, ROHS3 Compliant)

HER301T/R (EIC Semiconductor) — Parametric equivalent with identical electrical specifications, fast recovery characteristics, and DO-201AD package. Active product status with 5,685 units in stock. Recommended for direct replacement in fast-recovery applications.
UF5400-E3/73 (Vishay) — Fast recovery diode with 50 ns reverse recovery time, matching the HER301-T specification. Forward voltage of 1.0 V @ 3 A is superior to the original part. Active product status with 2,400 units in stock. Suitable for applications requiring fast recovery performance.
1N5400G (Taiwan Semiconductor) — Standard recovery equivalent with identical forward voltage (1.1 V @ 3 A) and matching electrical ratings. Active product status with 1,855 units in stock. Acceptable for applications where standard recovery characteristics are sufficient.

Secondary Substitutes (Active Status, Compliance Considerations)

1N5400-E3/54 (Vishay) — Standard recovery diode with slightly elevated forward voltage (1.2 V @ 3 A). Active product status with 2,400 units in stock. Suitable for general-purpose rectification where recovery speed is not critical.
GP30A-E3/54 (Vishay SUPERECTIFIER®) — Standard recovery diode with extended operating temperature range (-65°C to 175°C). Active product status with 907 units in stock. Applicable for temperature-sensitive applications.

Not Recommended for New Designs

1N5400RLG (onsemi) — Marked as "Not For New Designs" despite active inventory. Use only for legacy system maintenance.
1N5415 (Microchip) — RoHS non-compliant. Forward voltage specification (1.5 V @ 9 A) does not directly compare to 3 A rating.
1N5802 (Microchip) — Current rating of 1 A does not meet the 3 A requirement. RoHS non-compliant.

Frequently Asked Questions (FAQ)

Q: Can I use a standard recovery diode (> 500ns) as a substitute for the HER301-T fast recovery diode (≤ 500ns)?

A: Standard recovery diodes such as 1N5400G and 1N5400-E3/54 are electrically compatible with the HER301-T in terms of voltage and current ratings. However, the slower recovery time may affect circuit performance in high-frequency switching applications. Verify circuit requirements before substitution.

Q: What is the difference between the 1N5400G and 1N5400-E3/54?

A: Both parts meet the 50 V / 3 A specification. The 1N5400G has a forward voltage of 1.1 V @ 3 A (matching HER301-T), while the 1N5400-E3/54 has 1.2 V @ 3 A. The 1N5400G is preferred for applications sensitive to forward voltage drop. The 1N5400-E3/54 is supplied in cut tape packaging.

Q: Is the HER301T/R a true equivalent to the HER301-T?

A: Yes. The HER301T/R is a parametric equivalent manufactured by EIC Semiconductor with identical electrical specifications, including 50 V rating, 3 A current, 1.1 V forward voltage @ 3 A, and 50 ns reverse recovery time. The primary difference is packaging format (tape & reel vs. standard).

Q: Why is the 1N5415 not recommended as a substitute?

A: The 1N5415 is RoHS non-compliant, which may conflict with environmental regulations in your application. Additionally, its forward voltage specification (1.5 V @ 9 A) does not directly correspond to the 3 A operating point of the HER301-T, making direct comparison difficult.

Q: Can I use the 1N5802 as a substitute?

A: No. The 1N5802 is rated for only 1 A average rectified current, which is insufficient for the 3 A requirement of the HER301-T. It is not a suitable substitute.

Q: What is the significance of the DO-201AD package specification?

A: The DO-201AD is an axial through-hole package with specific lead diameter and spacing. Substitute parts must use the same or mechanically compatible package to ensure proper PCB mounting and thermal performance. The 1N5400RLG uses DO-201AA / DO-27, which may have different mechanical dimensions.

Q: Are all recommended substitutes ROHS3 compliant?

A: All primary and secondary recommended substitutes (HER301T/R, UF5400-E3/73, 1N5400G, 1N5400-E3/54, and GP30A-E3/54) are ROHS3 compliant. The 1N5415 and 1N5802 are RoHS non-compliant and should not be used in applications requiring environmental compliance.

Q: What is the operating temperature range difference between substitutes?

A: The HER301-T operates from -65°C to 150°C. Most substitutes maintain this range or extend it. The GP30A-E3/54 extends to 175°C, providing additional thermal margin. The 1N5400-E3/54 has a reduced lower limit (-50°C), which may be insufficient for some applications.

Q: How do I determine which substitute is best for my application?

A: Selection depends on three factors: (1) Recovery speed requirement (fast vs. standard), (2) Forward voltage sensitivity, and (3) Environmental compliance needs. For fast-recovery applications, use HER301T/R or UF5400-E3/73. For standard applications, use 1N5400G. Verify all compliance requirements before final selection.

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