HER204-AP Equivalent & Substitute Parts

Part Overview

The HER204-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 300 V DC reverse voltage and 2 A average rectified current in a DO-15 through-hole package. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity. Active alternatives with identical or superior electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	300	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 @ 300 V
Mounting Type	Through Hole	—
Package / Case	DO-204AC, DO-15, Axial	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the HER204-AP is determined by equivalence in the following critical parameters: maximum reverse voltage (300 V), average rectified current (2 A), reverse recovery time (50 ns), reverse leakage current (5 µA @ 300 V), and through-hole axial mounting configuration. Parts are grouped into two categories:

Direct Manufacturer Equivalent: HER204G-AP maintains identical electrical specifications and is manufactured by the same supplier (Micro Commercial Co) with active product status and Tape & Box packaging.

Parametric Equivalent: HER204G A0G (Taiwan Semiconductor Corporation) and EGP20F-E3/54 (Vishay General Semiconductor) meet all critical electrical parameters within specified tolerances and are available in active product status with alternative packaging formats.

Parameter Comparison

Parameter	HER204-AP (Main)	HER204G-AP (Direct Equivalent)	EGP20F-E3/54 (Parametric Equivalent)	HER204G A0G (Parametric Equivalent)
Manufacturer	Micro Commercial Co	Micro Commercial Co	Vishay General Semiconductor	Taiwan Semiconductor Corporation
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	300 V	300 V	300 V	300 V
Current - Average Rectified (Io)	2 A	2 A	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 2 A	1 V @ 2 A	1.25 V @ 2 A	1 V @ 2 A
Reverse Recovery Time (trr)	50 ns	50 ns	50 ns	50 ns
Current - Reverse Leakage @ Vr	5 µA @ 300 V	5 µA @ 300 V	5 µA @ 300 V	5 µA @ 300 V
Capacitance @ Vr, F	50 pF @ 4V, 1MHz	50 pF @ 4V, 1MHz	45 pF @ 4V, 1MHz	35 pF @ 4V, 1MHz
Operating Temperature - Junction	-55 to 150 °C	-55 to 150 °C	-65 to 150 °C	-55 to 150 °C
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Supplier Device Package	DO-15	DO-15	DO-204AC (DO-15)	DO-204AC (DO-15)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	—	Tape & Box (TB)	Tape & Reel (TR)	—

Engineering Selection Recommendations

HER204G-AP is the primary substitute for HER204-AP. It is manufactured by the same supplier (Micro Commercial Co), maintains identical electrical specifications, and holds active product status. This part is available in Tape & Box packaging with 770 units in stock. Selection of HER204G-AP eliminates obsolescence risk while preserving all electrical and thermal characteristics of the original design.

EGP20F-E3/54 (Vishay General Semiconductor) is a parametric equivalent suitable for applications where forward voltage tolerance of 1.25 V (versus 1 V) is acceptable. This part offers an extended operating temperature range (-65 to 150 °C) and is available in Tape & Reel packaging with 944 units in stock. The SUPERECTIFIER® series designation indicates optimized fast-recovery characteristics.

HER204G A0G (Taiwan Semiconductor Corporation) is a parametric equivalent with identical forward voltage specification (1 V @ 2 A) and active product status. This part features reduced junction capacitance (35 pF) compared to the original specification and is available with 1140 units in stock.

All three substitute parts are ROHS3 compliant and maintain the required electrical performance for 300 V, 2 A rectification applications.

Frequently Asked Questions (FAQ)

Q: Can HER204G-AP be used as a direct replacement for HER204-AP?

A: Yes. HER204G-AP is a direct equivalent manufactured by Micro Commercial Co with identical voltage rating (300 V), current rating (2 A), forward voltage (1 V @ 2 A), and reverse recovery time (50 ns). The primary difference is product status (active versus obsolete) and packaging format (Tape & Box versus unspecified).

Q: What is the difference between HER204G-AP and EGP20F-E3/54?

A: Both parts meet the 300 V, 2 A electrical requirements and 50 ns reverse recovery time. The key difference is forward voltage: HER204G-AP specifies 1 V @ 2 A, while EGP20F-E3/54 specifies 1.25 V @ 2 A. EGP20F-E3/54 offers an extended temperature range (-65 to 150 °C) and comes in Tape & Reel packaging. Selection depends on forward voltage tolerance requirements in the application circuit.

Q: Are all substitute parts available in the same package?

A: All substitute parts are available in DO-15 axial through-hole configuration, which is mechanically compatible with the original HER204-AP. Packaging formats differ: HER204G-AP is supplied in Tape & Box, EGP20F-E3/54 in Tape & Reel, and HER204G A0G in an unspecified format. These packaging differences do not affect electrical performance or board-level compatibility.

Q: Do the substitute parts meet RoHS compliance requirements?

A: Yes. HER204G-AP, EGP20F-E3/54, and HER204G A0G are all ROHS3 compliant, matching the compliance status of the original HER204-AP.

Q: Which substitute part has the lowest reverse leakage current?

A: All three substitute parts specify 5 µA @ 300 V reverse leakage current, identical to the original HER204-AP specification.

Q: Can EGP20F-E3/54 be used in applications requiring 1 V forward voltage specification?

A: EGP20F-E3/54 specifies a maximum forward voltage of 1.25 V @ 2 A, which exceeds the 1 V specification of HER204-AP. Circuit design must accommodate this higher forward voltage drop. For applications with strict forward voltage requirements, HER204G-AP or HER204G A0G are preferred.

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