HER157G A0G Equivalent & Substitute Parts

Part Overview

The HER157G A0G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 800 V DC reverse voltage and 1.5 A average rectified current in a DO-204AC (DO-15) through-hole axial package. This component is classified as Active product status and complies with RoHS3 and REACH regulations. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design optimization within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1.5 A	V
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	5	µA @ 800 V
Package / Case	DO-204AC, DO-15, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the HER157G A0G are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 800 V minimum
Package / Case: DO-204AC, DO-15, Axial (through-hole axial configuration)
Mounting Type: Through Hole
Technology: Standard rectifier diode

Secondary Compatibility Parameters:

Current - Average Rectified (Io): Equal to or greater than 1.5 A
Reverse Recovery Time (trr): Fast Recovery classification (≤ 500 ns, > 200 mA)
Operating Temperature Range: Minimum -55°C junction temperature
RoHS Compliance: ROHS3 Compliant preferred for regulatory alignment

Parts meeting these criteria are electrically and mechanically compatible for direct substitution in applications designed for the HER157G A0G.

Parameter Comparison

Parameter	HER157G A0G	GP15K-E3/54	1N5621GP-E3/54	BYV26DGP-E3/73	EGP20K
Manufacturer	Taiwan Semiconductor Corporation	Vishay General Semiconductor	Vishay General Semiconductor	Vishay General Semiconductor	Nexperia USA Inc.
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V	800 V	800 V
Current - Average Rectified (Io)	1.5 A	1.5 A	1 A	1 A	2 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1.5 A	1.1 V @ 1.5 A	1.2 V @ 1 A	2.5 V @ 1 A	1.7 V @ 2 A
Speed Classification	Fast Recovery ≤ 500 ns	Standard Recovery > 500 ns	Fast Recovery ≤ 500 ns	Fast Recovery ≤ 500 ns	Fast Recovery ≤ 500 ns
Reverse Recovery Time (trr)	75 ns	3.5 µs	300 ns	75 ns	75 ns
Current - Reverse Leakage @ Vr	5 µA @ 800 V	5 µA @ 800 V	500 nA @ 800 V	5 µA @ 800 V	5 µA @ 800 V
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Operating Temperature - Junction	-55 to 150°C	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 150°C
Product Status	Active	Active	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

Direct Substitutes (Preferred):

GP15K-E3/54 (Vishay General Semiconductor) is the closest electrical equivalent to the HER157G A0G. Both parts share identical voltage and current ratings (800 V, 1.5 A), matching package configuration (DO-204AC), and RoHS3 compliance. The GP15K-E3/54 operates across an extended temperature range (-65 to 175°C versus -55 to 150°C) and maintains equivalent reverse leakage characteristics. The primary difference is reverse recovery time classification: the GP15K-E3/54 operates in the Standard Recovery category (3.5 µs) compared to the HER157G A0G Fast Recovery specification (75 ns). This distinction affects switching performance in high-frequency applications.

Compatible Substitutes (Current Derating Required):

1N5621GP-E3/54 (Vishay General Semiconductor) and BYV26DGP-E3/73 (Vishay General Semiconductor) both operate at 800 V but are rated for 1 A average rectified current, representing a 33% current reduction from the HER157G A0G specification. These parts are suitable for applications where the actual operating current does not exceed 1 A. Both maintain Fast Recovery characteristics and RoHS3 compliance. The 1N5621GP-E3/54 exhibits superior reverse leakage performance (500 nA versus 5 µA), while the BYV26DGP-E3/73 demonstrates higher forward voltage drop (2.5 V @ 1 A).

Higher Current Alternative:

EGP20K (Nexperia USA Inc.) provides 2 A average rectified current capacity, exceeding the HER157G A0G by 33%. This part maintains 800 V voltage rating, Fast Recovery characteristics (75 ns), and identical package configuration. However, the EGP20K carries Obsolete product status and RoHS non-compliance, limiting its use in new designs or regulated applications.

Selection Basis:

Active product status and RoHS3 compliance are prioritized for long-term supply assurance and regulatory adherence
Voltage and package compatibility are mandatory for mechanical and electrical interchangeability
Current rating must equal or exceed application requirements
Recovery time classification affects switching losses and electromagnetic interference characteristics

Frequently Asked Questions (FAQ)

Q: Can the GP15K-E3/54 replace the HER157G A0G in all applications?

A: The GP15K-E3/54 is electrically and mechanically compatible with identical voltage (800 V) and current (1.5 A) ratings. The primary difference is reverse recovery time: GP15K-E3/54 operates at 3.5 µs (Standard Recovery) versus HER157G A0G at 75 ns (Fast Recovery). In low-frequency rectification circuits, this difference is negligible. In high-frequency switching applications, the longer recovery time of the GP15K-E3/54 increases switching losses and may generate additional electromagnetic interference. Application-specific circuit analysis is required to determine compatibility.

Q: Why are 1N5621GP-E3/54 and BYV26DGP-E3/73 listed as substitutes if they have lower current ratings?

A: These parts are qualified substitutes for applications where the actual operating current does not exceed 1 A. The HER157G A0G is rated for 1.5 A maximum, but many circuit designs operate at lower current levels. Both parts maintain the 800 V voltage rating and DO-204AC package compatibility. Selection depends on the specific application's current requirements and thermal environment.

Q: What is the significance of the DO-204AC and DO-15 package designations?

A: DO-204AC and DO-15 refer to the same through-hole axial package configuration. DO-204AC is the formal JEDEC designation, while DO-15 is the legacy designation. All substitute parts listed use this identical package, ensuring mechanical compatibility with printed circuit board layouts and component insertion equipment designed for the HER157G A0G.

Q: Is the EGP20K suitable for new product designs?

A: The EGP20K carries Obsolete product status and RoHS non-compliance. While it provides higher current capacity (2 A), it is not recommended for new designs due to supply discontinuation risk and regulatory non-compliance with RoHS3 requirements. Active, RoHS3-compliant alternatives are preferred for design longevity and regulatory adherence.

Q: How do forward voltage drop differences affect circuit performance?

A: Forward voltage drop (Vf) varies across substitute parts: HER157G A0G (1 V @ 1.5 A), GP15K-E3/54 (1.1 V @ 1.5 A), 1N5621GP-E3/54 (1.2 V @ 1 A), BYV26DGP-E3/73 (2.5 V @ 1 A), and EGP20K (1.7 V @ 2 A). Higher forward voltage drop increases power dissipation and heat generation. In power supply circuits, this affects efficiency and thermal management. In signal rectification circuits, the difference is typically negligible. Circuit thermal analysis and power budget calculations determine acceptable forward voltage drop ranges.

Q: What does RoHS3 compliance mean for component selection?

A: RoHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the component meets European Union regulations restricting hazardous materials including lead, cadmium, mercury, and certain flame retardants. RoHS3-compliant parts are required for products sold in the European Union and are increasingly mandated by global manufacturers. The HER157G A0G and all recommended substitutes (GP15K-E3/54, 1N5621GP-E3/54, BYV26DGP-E3/73) are RoHS3 compliant. The EGP20K is RoHS non-compliant and unsuitable for regulated applications.

Q: Can reverse recovery time affect circuit reliability?

A: Reverse recovery time (trr) determines how quickly a diode transitions from conducting to blocking state. Shorter recovery times (75 ns for HER157G A0G, BYV26DGP-E3/73, EGP20K) reduce switching transients and electromagnetic interference. Longer recovery times (3.5 µs for GP15K-E3/54, 300 ns for 1N5621GP-E3/54) increase switching losses and may cause voltage overshoot in inductive circuits. In rectification applications with stable DC loads, recovery time differences have minimal impact on reliability. In switching power supplies and high-frequency circuits, recovery time becomes a critical design parameter.

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