HER101G-TP Equivalent & Substitute Parts

Part Overview

The HER101G-TP is a general-purpose rectifier diode rated for 50 V DC reverse voltage and 1 A average rectified current in a through-hole DO-41 package. Manufactured by Micro Commercial Co, this component features fast recovery characteristics with a reverse recovery time of 50 ns, making it suitable for standard rectification applications requiring rapid switching performance.

The HER101G-TP carries a "Not For New Designs" product status, indicating that this part is no longer recommended for new circuit development. This status necessitates identification of equivalent substitute components that maintain electrical and mechanical compatibility while offering active product support and extended lifecycle availability.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Mounting Type	Through Hole	-
Package / Case	DO-204AL, DO-41, Axial	-
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the HER101G-TP is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

Voltage - DC Reverse (Vr) (Max): 50 V minimum
Current - Average Rectified (Io): 1 A minimum
Voltage - Forward (Vf) (Max) @ If: 1 V or lower @ 1 A
Current - Reverse Leakage @ Vr: 5 µA or lower @ 50 V
Speed Classification: Fast Recovery (≤ 500ns, > 200mA) or Standard Recovery (> 500ns, > 200mA)

Mechanical Equivalence Requirements:

Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial configurations
Operating Temperature Range: Minimum -55°C to 125°C

Compliance Requirements:

RoHS3 Compliant
REACH Unaffected

Substitute parts must satisfy all electrical parameters at or above the HER101G-TP specifications and maintain through-hole axial package compatibility. Parts with identical or superior electrical ratings and active product status are prioritized for new design applications.

Parameter Comparison

Parameter	HER101G-TP (Main)	1N4001G	1N4001RLG	1N4933G	FR101G R1G
Manufacturer	Micro Commercial Co	Taiwan Semiconductor Corporation	onsemi	Good-Ark Semiconductor	Taiwan Semiconductor Corporation
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A	1 V @ 1 A	1.1 V @ 1 A	1.2 V @ 1 A	1.3 V @ 1 A
Speed	Fast Recovery ≤ 500ns	Standard Recovery > 500ns	Standard Recovery > 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns
Reverse Recovery Time (trr)	50 ns	-	-	200 ns	150 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	10 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V
Capacitance @ Vr, F	20 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	-	15 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Operating Temperature - Junction	-55 to 125°C	-55 to 150°C	-65 to 175°C	-55 to 125°C	-55 to 150°C
Product Status	Not For New Designs	Active	Not For New Designs	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes for Active Product Status:

The 1N4001G (Taiwan Semiconductor Corporation) and 1N4933G (Good-Ark Semiconductor) are recommended as primary substitutes for the HER101G-TP. Both components carry Active product status, ensuring continued manufacturing support and extended lifecycle availability. The 1N4001G maintains identical electrical specifications with standard recovery characteristics, while the 1N4933G provides fast recovery performance matching the HER101G-TP's switching speed classification.

The FR101G R1G (Taiwan Semiconductor Corporation) serves as an alternative active substitute with fast recovery characteristics and extended operating temperature range (-55 to 150°C), providing additional thermal margin for demanding applications.

Secondary Substitutes:

The 1N4001RLG (onsemi) is electrically compatible but carries "Not For New Designs" status, limiting its suitability for new circuit development. This part exhibits slightly elevated reverse leakage current (10 µA versus 5 µA) and forward voltage drop (1.1 V versus 1 V), requiring circuit-level verification in applications with tight tolerance requirements.

Compliance Verification:

All substitute parts maintain ROHS3 compliance and REACH Unaffected status, satisfying regulatory requirements equivalent to the HER101G-TP. Selection between active substitutes should prioritize application-specific requirements for recovery speed, forward voltage characteristics, and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the 1N4001G directly replace the HER101G-TP in existing designs?

A: The 1N4001G is electrically compatible with the HER101G-TP across all critical parameters: 50 V reverse voltage, 1 A average rectified current, and 1 V maximum forward voltage drop. Both components use identical through-hole DO-41 packaging. The primary difference is recovery speed classification: 1N4001G operates as a standard recovery diode (> 500ns) while HER101G-TP is fast recovery (≤ 500ns). In applications where switching speed is not critical, direct substitution is valid. In high-frequency or fast-switching applications, circuit performance must be evaluated.

Q: What is the significance of fast recovery versus standard recovery classification?

A: Fast recovery diodes (≤ 500ns reverse recovery time) switch off more rapidly than standard recovery diodes (> 500ns), reducing reverse current spikes and switching losses in high-frequency applications. The HER101G-TP and 1N4933G both specify fast recovery characteristics, while the 1N4001G and 1N4001RLG specify standard recovery. Selection depends on circuit switching frequency and EMI requirements.

Q: Are all substitute parts available in the same DO-41 package?

A: All listed substitute parts support DO-204AL, DO-41, and Axial package configurations. Verify the specific supplier device package designation when ordering to ensure receipt of the correct physical form factor for your PCB layout.

Q: Why does the 1N4001RLG show higher reverse leakage current (10 µA) compared to the HER101G-TP (5 µA)?

A: Reverse leakage current variation within the same voltage and current rating class reflects manufacturing process differences between manufacturers. The 1N4001RLG's 10 µA specification remains within acceptable limits for general-purpose rectification but may impact performance in precision analog circuits or high-impedance applications requiring minimal leakage.

Q: Which substitute offers the widest operating temperature range?

A: The 1N4001RLG (onsemi) specifies -65 to 175°C operating temperature range, providing the broadest thermal envelope. The 1N4001G and FR101G R1G both extend to 150°C, while the HER101G-TP and 1N4933G are rated to 125°C. Temperature range selection depends on application environment and thermal management requirements.

Q: Is the FR101G R1G suitable for new designs?

A: Yes. The FR101G R1G carries Active product status and is suitable for new circuit development. It provides fast recovery performance (150 ns reverse recovery time) and extended operating temperature range (-55 to 150°C), making it appropriate for applications requiring superior switching characteristics and thermal margin.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts listed maintain ROHS3 compliance and REACH Unaffected status, matching the HER101G-TP's regulatory posture. These certifications satisfy environmental and hazardous substance restrictions applicable to electronic components in regulated markets.

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