HER151G A0G Equivalent & Substitute Parts

Part Overview

The HER151G A0G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 1.5 A average rectified current. This through-hole component features fast recovery characteristics with a 50 ns reverse recovery time and operates across a junction temperature range of -55°C to 150°C. The device is housed in a DO-204AC (DO-15) axial package and maintains active product status with full RoHS3 compliance.

Equivalent and substitute parts are identified when alternative diodes meet or exceed the electrical specifications of the HER151G A0G while maintaining compatible mechanical packaging and thermal performance. Substitutes enable design flexibility, support supply chain continuity, and provide options across multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 1.5 A
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Package / Case	DO-204AC, DO-15, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the HER151G A0G are qualified based on the following substitution criteria:

Electrical Compatibility Requirements:

DC reverse voltage rating equal to or greater than 50 V
Average rectified current rating equal to or greater than 1.5 A
Reverse recovery time equal to or less than 50 ns (fast recovery classification)
Reverse leakage current equal to or less than 5 µA @ 50 V
Forward voltage drop compatible with circuit operation

Mechanical Compatibility Requirements:

Package type: DO-204AC (DO-15) axial through-hole configuration
Mounting type: Through-hole for PCB insertion
Physical dimensions compatible with DO-15 standard

Environmental & Compliance Requirements:

Operating temperature range encompassing or exceeding -55°C to 150°C
RoHS3 compliance status
REACH unaffected classification

The identified substitutes (EGP20A and EGP20A-E3/54) meet all electrical parameters at or above the HER151G A0G specification level, share identical package geometry, and maintain equivalent environmental compliance certifications.

Parameter Comparison

Parameter	HER151G A0G (Main Part)	EGP20A	EGP20A-E3/54
Manufacturer	Taiwan Semiconductor Corporation	Fairchild Semiconductor	Vishay General Semiconductor - Diodes Division
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V
Current - Average Rectified (Io)	1.5 A	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1.5 A	950 mV @ 2 A	950 mV @ 2 A
Reverse Recovery Time (trr)	50 ns	50 ns	50 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V
Package / Case	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Mounting Type	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	-55 to 150°C	-65 to 150°C	-65 to 150°C
Technology	Standard	Standard	Standard
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Substitute: EGP20A-E3/54

The EGP20A-E3/54 manufactured by Vishay General Semiconductor is the preferred substitute for the HER151G A0G. This part maintains full electrical equivalence with superior current rating (2 A versus 1.5 A), identical reverse recovery time (50 ns), and matching reverse leakage characteristics (5 µA @ 50 V). The EGP20A-E3/54 is supplied in Cut Tape (CT) packaging, carries ROHS3 compliance certification, and operates across an extended temperature range (-65°C to 150°C). The part is actively produced and maintains 1031 units in current inventory stock.

Secondary Substitute: EGP20A

The EGP20A manufactured by Fairchild Semiconductor provides electrical substitution with 2 A average rectified current, 50 V reverse voltage rating, and 50 ns reverse recovery time. This part shares identical fast recovery characteristics and reverse leakage specifications. The EGP20A operates across -65°C to 150°C and is supplied in bulk packaging with 24,846 units in inventory. ROHS3 compliance status is not specified for this variant.

Selection Basis:

Both substitutes exceed the HER151G A0G current rating, ensuring operation within design margins. All three parts maintain identical reverse voltage, recovery time, and leakage specifications. Package geometry and through-hole mounting are fully compatible. The EGP20A-E3/54 is recommended where RoHS3 compliance documentation is required; the EGP20A is suitable for applications where compliance status is not a constraint.

Frequently Asked Questions (FAQ)

Q: Can the EGP20A or EGP20A-E3/54 directly replace the HER151G A0G in existing designs?

A: Yes. Both substitutes share the DO-204AC (DO-15) axial through-hole package, identical reverse voltage (50 V), matching reverse recovery time (50 ns), and equivalent reverse leakage current (5 µA @ 50 V). The higher current ratings (2 A) of the substitutes provide additional design margin. No PCB layout modifications are required.

Q: What is the difference between EGP20A and EGP20A-E3/54?

A: Both parts are electrically identical with 50 V reverse voltage, 2 A average rectified current, and 50 ns reverse recovery time. The primary differences are manufacturer (Fairchild Semiconductor versus Vishay General Semiconductor), packaging format (bulk versus cut tape), and compliance documentation. The EGP20A-E3/54 carries explicit ROHS3 compliance certification; the EGP20A compliance status is not specified.

Q: Are there temperature range differences between the main part and substitutes?

A: The HER151G A0G operates from -55°C to 150°C junction temperature. Both substitutes (EGP20A and EGP20A-E3/54) operate from -65°C to 150°C, providing an extended low-temperature operating range. This extended range does not restrict substitution and may provide additional design flexibility in cold-environment applications.

Q: What is the forward voltage difference between the HER151G A0G and the substitutes?

A: The HER151G A0G is specified at 1 V forward voltage drop at 1.5 A. The EGP20A and EGP20A-E3/54 are specified at 950 mV at 2 A. Direct voltage comparison at identical current levels is not provided in the specifications; however, the lower forward voltage at higher current in the substitutes indicates improved efficiency characteristics.

Q: Can I use these substitutes in high-frequency switching applications?

A: All three parts are classified as fast recovery diodes with 50 ns reverse recovery time and fast recovery speed (≤ 500ns, > 200mA). This classification supports high-frequency switching applications. The identical reverse recovery time ensures equivalent switching performance.

Q: What packaging options are available for these substitutes?

A: The HER151G A0G is supplied in standard packaging (not specified). The EGP20A is available in bulk packaging with 24,846 units in stock. The EGP20A-E3/54 is supplied in cut tape (CT) format with 1,031 units in stock. Both packaging formats are suitable for through-hole assembly; selection depends on production volume and assembly process requirements.

Q: Are there any compliance or regulatory differences between these parts?

A: The HER151G A0G and EGP20A-E3/54 are both ROHS3 compliant. All three parts are REACH unaffected. The EGP20A compliance status is not specified in available documentation. For applications requiring documented RoHS3 compliance, the EGP20A-E3/54 is the recommended choice.

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