HER302G-AP Equivalent & Substitute Parts

Part Overview

The HER302G-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 100 V DC reverse voltage and 3 A average rectified current in a through-hole DO-201AD axial package. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and regulatory compliance can be maintained across alternative manufacturers while preserving circuit functionality and reliability requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 3 A	mV
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	10	µA @ 100 V
Package / Case	DO-201AD, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the HER302G-AP are identified based on strict equivalence of the following electrical and mechanical parameters:

Voltage Rating: DC reverse voltage of 100 V (maximum)
Current Rating: Average rectified current of 3 A
Package Type: DO-201AD axial through-hole configuration
Mounting Method: Through-hole technology
Recovery Characteristics: Fast recovery with reverse recovery time of 50 ns
Reverse Leakage: 10 µA at 100 V
Temperature Range: Operating junction temperature from -55°C to 150°C
Regulatory Compliance: RoHS3 compliant status

The UF5401-E3/73 meets all these criteria and is therefore classified as a parametric equivalent. Both components share identical voltage and current ratings, package designation, mounting type, and regulatory certifications. Differences in forward voltage (950 mV versus 1 V at 3 A) and junction capacitance (80 pF versus 45 pF at 4 V, 1 MHz) remain within acceptable tolerance for general-purpose rectification applications.

Parameter Comparison

Parameter	HER302G-AP (Micro Commercial Co)	UF5401-E3/73 (Vishay)	Match Status
Voltage - DC Reverse (Vr) (Max)	100 V	100 V	Equivalent
Current - Average Rectified (Io)	3 A	3 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	950 mV @ 3 A	1 V @ 3 A	Within Tolerance
Reverse Recovery Time (trr)	50 ns	50 ns	Equivalent
Current - Reverse Leakage @ Vr	10 µA @ 100 V	10 µA @ 100 V	Equivalent
Capacitance @ Vr, F	80 pF @ 4 V, 1 MHz	45 pF @ 4 V, 1 MHz	Within Tolerance
Package / Case	DO-201AD, Axial	DO-201AD, Axial	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Product Status	Active	Active	Equivalent

Engineering Selection Recommendations

Both the HER302G-AP and UF5401-E3/73 are Active product status components with ROHS3 compliance and REACH unaffected status. Selection between these parts is determined by application-specific requirements and supply chain availability.

The HER302G-AP (Micro Commercial Co) exhibits a forward voltage of 950 mV at 3 A and junction capacitance of 80 pF at 4 V, 1 MHz. The UF5401-E3/73 (Vishay) presents a forward voltage of 1 V at 3 A and junction capacitance of 45 pF at 4 V, 1 MHz. These parameter variations are within acceptable ranges for general-purpose rectification circuits and do not affect functional interchangeability in standard power supply and signal conditioning applications.

Both components are supplied in DO-201AD axial through-hole packages and operate across the identical temperature range of -55°C to 150°C. Packaging format for the UF5401-E3/73 is specified as Cut Tape (CT), while the HER302G-AP packaging designation is not specified in the provided data.

Frequently Asked Questions (FAQ)

Q: Can the UF5401-E3/73 be used as a direct replacement for the HER302G-AP in existing designs?

A: Yes. Both components share identical voltage ratings (100 V), current ratings (3 A), package type (DO-201AD axial), mounting method (through-hole), and operating temperature range (-55°C to 150°C). The minor differences in forward voltage and junction capacitance do not prevent functional substitution in general-purpose rectification applications.

Q: What is the significance of the forward voltage difference between these parts?

A: The HER302G-AP specifies 950 mV forward voltage at 3 A, while the UF5401-E3/73 specifies 1 V at 3 A. This 50 mV difference represents approximately 5% variation and is typical among rectifier diodes from different manufacturers. For most power supply and signal conditioning circuits, this variation falls within acceptable design margins.

Q: Are both parts suitable for high-frequency switching applications?

A: Both components are classified as fast recovery diodes with 50 ns reverse recovery time. This specification supports switching frequencies typical of standard power supply designs. Application-specific frequency requirements should be evaluated against the provided reverse recovery time specification.

Q: What is the difference between the packaging formats listed?

A: The HER302G-AP packaging format is not specified in the provided data. The UF5401-E3/73 is supplied in Cut Tape (CT) format. Both components use the DO-201AD axial through-hole package type, which is mechanically and electrically identical. Packaging format refers to the delivery method (tape, tube, or bulk) and does not affect component performance or interchangeability.

Q: Are both parts RoHS compliant?

A: Yes. Both the HER302G-AP and UF5401-E3/73 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: What is the reverse leakage current specification, and why is it important?

A: Both components specify 10 µA reverse leakage current at 100 V. This parameter indicates the small current that flows through the diode when reverse biased. Lower reverse leakage improves circuit efficiency and reduces heat generation in blocking mode operation.

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