HER303-TP Equivalent & Substitute Parts

Part Overview

The HER303-TP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 200 V DC reverse voltage and 3 A average rectified current in a DO-201AD axial through-hole package. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing production and maintenance applications. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with minor parameter variations within acceptable operating ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	10	µA @ 200 V
Mounting Type	Through Hole	—
Package / Case	DO-201AD, Axial	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the HER303-TP is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 200 V
Current - Average Rectified (Io): 3 A
Mounting Type: Through Hole
Package / Case: DO-201AD or compatible axial package

Allowable Parameter Variations:

Voltage - Forward (Vf) (Max) @ If: Up to 1.2 V @ 3 A
Speed: Fast Recovery (≤ 500ns) or Standard Recovery (> 500ns)
Reverse Recovery Time (trr): 50 ns or greater
Current - Reverse Leakage @ Vr: 1 to 10 µA @ 200 V
Operating Temperature - Junction: -50°C to -55°C minimum; 150°C maximum
Capacitance @ Vr, F: Variations acceptable within specified frequency

Parts meeting these criteria are classified as parametric equivalents or similar manufacturers' parts suitable for direct substitution in the HER303-TP application.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	trr [ns]	Ir @ Vr [µA]	Package	Product Status
HER303-TP	Micro Commercial Co	200	3	1 @ 3 A	Fast Recovery ≤ 500ns	50	10 @ 200 V	DO-201AD	Obsolete
HER303G-TP	Micro Commercial Co	200	3	1 @ 3 A	Fast Recovery ≤ 500ns	50	10 @ 200 V	DO-201AD	Not For New Designs
HER303G	HY Electronic (Cayman) Limited	200	3	1 @ 3 A	Fast Recovery ≤ 500ns	50	5 @ 200 V	DO-27	Active
UF302G_R2_00001	Panjit International Inc.	200	3	1 @ 3 A	Fast Recovery ≤ 500ns	50	1 @ 200 V	DO-201AD	Active
UF5402-E3/54	Vishay General Semiconductor - Diodes Division	200	3	1 @ 3 A	Fast Recovery ≤ 500ns	50	10 @ 200 V	DO-201AD	Active
UF5402-E3/73	Vishay General Semiconductor - Diodes Division	200	3	1 @ 3 A	Fast Recovery ≤ 500ns	50	10 @ 200 V	DO-201AD	Active
1N5402-E3/73	Vishay General Semiconductor - Diodes Division	200	3	1.2 @ 3 A	Standard Recovery > 500ns	—	5 @ 200 V	DO-201AD	Active

Engineering Selection Recommendations

Parametric Equivalents (Preferred for Direct Replacement):

HER303G-TP, UF5402-E3/54, and UF5402-E3/73 maintain identical electrical specifications to the HER303-TP, including forward voltage, recovery time, and reverse leakage characteristics. These parts are suitable for direct substitution in existing designs. HER303G-TP carries "Not For New Designs" status; however, it remains functionally equivalent for legacy system maintenance. UF5402-E3/54 and UF5402-E3/73 are both active products from Vishay General Semiconductor - Diodes Division and are recommended for new production applications.

Active Parametric Equivalents with Minor Variations:

UF302G_R2_00001 (Panjit International Inc.) matches all critical electrical parameters and maintains DO-201AD packaging. This part exhibits superior reverse leakage performance (1 µA @ 200 V versus 10 µA), making it suitable for applications requiring lower leakage current. Product status is active.

HER303G (HY Electronic) provides parametric equivalence with identical electrical performance but uses DO-27 axial packaging instead of DO-201AD. This package variation requires mechanical compatibility verification in the target application. Product status is active.

Similar Manufacturer Part with Parameter Deviation:

1N5402-E3/73 (Vishay General Semiconductor - Diodes Division) operates at 200 V, 3 A with DO-201AD packaging but exhibits forward voltage of 1.2 V @ 3 A (versus 1 V) and standard recovery speed (> 500ns versus ≤ 500ns). This part is suitable for applications where forward voltage drop and recovery speed are not critical design constraints. Product status is active.

All recommended substitutes comply with ROHS3 and carry EAR99 ECCN classification, matching the original part's regulatory status.

Frequently Asked Questions (FAQ)

Q: Can HER303G be used as a direct replacement for HER303-TP?

A: HER303G is a parametric equivalent with identical electrical specifications (200 V, 3 A, 1 V forward voltage, 50 ns recovery time). However, it uses DO-27 axial packaging instead of DO-201AD. Mechanical compatibility with the PCB layout and component placement must be verified before substitution.

Q: What is the difference between UF5402-E3/54 and UF5402-E3/73?

A: Both parts are manufactured by Vishay General Semiconductor - Diodes Division and maintain identical electrical specifications (200 V, 3 A, 1 V forward voltage, 50 ns recovery time, DO-201AD package). The difference lies in packaging configuration (tape reel designation). Both are suitable for direct substitution.

Q: Is 1N5402-E3/73 a suitable replacement for HER303-TP?

A: 1N5402-E3/73 meets the 200 V, 3 A voltage and current requirements in DO-201AD packaging. However, it exhibits forward voltage of 1.2 V @ 3 A (versus 1 V) and standard recovery speed (> 500ns versus ≤ 500ns). This part is suitable only for applications where these parameter variations do not impact circuit performance.

Q: Why does UF302G_R2_00001 show lower reverse leakage current?

A: UF302G_R2_00001 exhibits 1 µA @ 200 V reverse leakage compared to 10 µA in the HER303-TP. This represents superior leakage performance from Panjit International Inc. and does not preclude substitution; it indicates enhanced device characteristics suitable for low-leakage applications.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts comply with ROHS3 standards, matching the original HER303-TP compliance status. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts except UF302G_R2_00001, which is Not Applicable.

Q: What is the primary reason HER303-TP is obsolete?

A: The HER303-TP is classified as obsolete by Micro Commercial Co. Multiple active equivalent and substitute parts from established manufacturers (Vishay, Panjit, HY Electronic) provide identical or superior performance, making continued sourcing of the original part unnecessary.

Q: Can I use HER303G-TP for new designs?

A: HER303G-TP carries "Not For New Designs" status from Micro Commercial Co. For new production, UF5402-E3/54, UF5402-E3/73, or UF302G_R2_00001 are recommended as active alternatives with identical electrical specifications.

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