HER201G-AP General Purpose Rectifier Diode Equivalent & Substitute Parts

Part Overview

The HER201G-AP is a general purpose rectifier diode manufactured by Micro Commercial Co, rated for 50V DC reverse voltage and 2A average rectified current in a DO-15 through-hole package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary to support existing designs, maintain production continuity for legacy systems, and ensure component availability for repair and replacement applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 2 A
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Through Hole	—
Package / Case	DO-204AC, DO-15, Axial	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—

Substitute Part Grouping Explanation

Substitution of the HER201G-AP is determined by strict equivalence across the following critical parameters:

Voltage Rating: The substitute part must maintain a DC reverse voltage rating of 50V or higher to ensure safe operation within the original circuit design envelope.

Current Rating: The substitute part must support an average rectified current of 2A or greater to handle the specified load without thermal stress or performance degradation.

Forward Voltage Drop: The substitute part must not exceed 1V forward voltage drop at 2A to maintain circuit efficiency and thermal characteristics consistent with the original design.

Recovery Characteristics: The substitute part must operate as a fast recovery diode with reverse recovery time of 50ns or less to preserve switching performance in rectification applications.

Reverse Leakage: The substitute part must maintain reverse leakage current at or below 5µA at 50V to ensure circuit reliability and minimize standby power consumption.

Package Compatibility: The substitute part must be available in DO-15 or DO-204AC (equivalent axial through-hole packages) to ensure mechanical and electrical compatibility with existing PCB layouts and assembly processes.

Compliance Status: The substitute part must maintain RoHS3 compliance and REACH unaffected status to satisfy regulatory and supply chain requirements.

Parameter Comparison

Parameter	HER201G-AP (Micro Commercial Co)	HER201G A0G (Taiwan Semiconductor Corporation)	Compatibility
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	Equivalent
Current - Average Rectified (Io)	2 A	2 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1 V @ 2 A	1 V @ 2 A	Equivalent
Reverse Recovery Time (trr)	50 ns	50 ns	Equivalent
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	Equivalent
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	Equivalent
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C	Equivalent
Capacitance @ Vr, F	50 pF @ 4V, 1MHz	35 pF @ 4V, 1MHz	Substitute within tolerance
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Product Status	Not For New Designs	Active	Substitute is active

Engineering Selection Recommendations

The HER201G A0G manufactured by Taiwan Semiconductor Corporation is a direct parametric equivalent to the HER201G-AP. Both components share identical electrical specifications across voltage rating, current capacity, forward voltage drop, and recovery characteristics. The substitute part maintains full compliance with RoHS3 and REACH requirements, ensuring regulatory alignment with the original component.

A key distinction is product status: the HER201G-AP is designated "Not For New Designs," while the HER201G A0G carries "Active" status. This indicates the Taiwan Semiconductor Corporation variant remains in active production and is available for ongoing supply, making it suitable for both legacy system support and new production runs requiring this electrical specification.

The capacitance differential (50pF versus 35pF at 4V, 1MHz) falls within acceptable tolerance for general purpose rectification applications and does not impact functional equivalence for standard power supply and rectification circuits.

Both components are supplied in equivalent DO-15 and DO-204AC axial through-hole packages, ensuring direct mechanical compatibility with existing PCB designs without layout modification.

Frequently Asked Questions (FAQ)

Q: Can the HER201G A0G be used as a direct replacement for the HER201G-AP in existing designs?

A: Yes. The HER201G A0G meets all critical electrical parameters of the HER201G-AP, including voltage rating, current capacity, forward voltage drop, and recovery time. Both components are packaged in equivalent DO-15/DO-204AC through-hole formats and maintain identical operating temperature ranges. Direct substitution is supported without circuit modification.

Q: What is the significance of the "Not For New Designs" status on the HER201G-AP?

A: This designation indicates the HER201G-AP has reached end-of-life and is no longer recommended for new product development. However, it remains suitable for repair, maintenance, and legacy system support. The HER201G A0G, with "Active" status, is the recommended alternative for ongoing production and new applications requiring this electrical specification.

Q: Are the DO-15 and DO-204AC packages interchangeable?

A: Yes. DO-15 and DO-204AC are equivalent axial through-hole package designations for the same physical form factor. Both the HER201G-AP and HER201G A0G are available in these equivalent packages and are mechanically and electrically interchangeable on standard PCB layouts.

Q: Does the capacitance difference between the two parts affect circuit performance?

A: The capacitance difference (50pF versus 35pF) is minor and does not impact functional equivalence for general purpose rectification applications. This parameter variation is within acceptable tolerance for power supply circuits, bridge rectifiers, and standard switching applications. Application-specific high-frequency circuits should verify capacitance requirements against detailed circuit analysis.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the HER201G-AP and HER201G A0G are RoHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and supply.

Q: What is the reverse recovery time, and why is it important?

A: Reverse recovery time (trr) is 50ns for both components. This parameter defines how quickly the diode transitions from conducting to blocking state. Fast recovery characteristics (≤500ns) are essential for efficient rectification and switching applications, minimizing energy loss during the switching transition.

Q: Can these diodes be used in high-frequency switching applications?

A: Both components are classified as fast recovery diodes suitable for switching applications up to the frequency limits determined by the 50ns reverse recovery time. Specific frequency capability depends on circuit design and load conditions. Detailed application analysis is required for frequencies above 100kHz.

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