HER101G-AP Equivalent & Substitute Parts

Part Overview

The HER101G-AP is a general-purpose rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 1 A average rectified current in a DO-41 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 for ongoing maintenance, repair, and legacy system support where the original part is no longer readily available or where design flexibility permits component substitution within specified electrical and mechanical parameters.

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
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-AP is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Matching Parameters:

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
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial equivalent

Acceptable Variations:

Reverse Recovery Time (trr): May vary; fast recovery (≤500 ns) or standard recovery (>500 ns) are both acceptable
Operating Temperature Range: May exceed the original range
Capacitance @ Vr, F: May vary within manufacturer specifications

Substitute parts are grouped into two categories: Upgrade parts (direct functional replacements with improved or equivalent specifications) and Similar parts (functionally compatible with minor parameter variations or specialized qualifications).

Parameter Comparison

Parameter	HER101G-AP	1N4001-T	1N4001G	1N4933GHA0G	UG1A-E3/54
Manufacturer	Micro Commercial Co	Diodes Incorporated	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division
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 V @ 1 A	1.2 V @ 1 A	950 mV @ 1 A
Speed	Fast Recovery ≤500 ns	Standard Recovery >500 ns	Standard Recovery >500 ns	Fast Recovery ≤500 ns	Fast Recovery ≤500 ns
Reverse Recovery Time (trr)	50 ns	—	—	200 ns	25 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V
Capacitance @ Vr, F	20 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	10 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	-65 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C
Product Status	Not For New Designs	Last Time Buy	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

1N4001-T (Diodes Incorporated)

The 1N4001-T is a direct electrical equivalent to the HER101G-AP with identical voltage and current ratings. This part is classified as "Last Time Buy," indicating limited availability. It features standard recovery characteristics (>500 ns) compared to the fast recovery (50 ns) of the HER101G-AP. The extended operating temperature range (-65 to 150°C) provides greater thermal margin. ROHS3 compliance and RoHS status match the original part. Selection of this substitute is appropriate for applications where recovery speed is not a critical design parameter and where Last Time Buy inventory is accessible.

1N4001G (Taiwan Semiconductor Corporation)

The 1N4001G is an active-status general-purpose rectifier diode with identical electrical specifications to the HER101G-AP. This part is currently in active production, ensuring long-term availability. It features standard recovery characteristics and an extended upper operating temperature limit of 150°C. The lower capacitance (10 pF versus 20 pF) may provide marginal benefits in high-frequency applications. ROHS3 compliance is maintained. This substitute is recommended for new production support and legacy system maintenance where active component availability is required.

1N4933GHA0G (Taiwan Semiconductor Corporation)

The 1N4933GHA0G meets all critical electrical parameters with a maximum forward voltage of 1.2 V at 1 A, which remains within acceptable substitution limits. This part features fast recovery characteristics (≤500 ns, trr = 200 ns) matching the speed profile of the HER101G-AP. The component carries AEC-Q101 automotive qualification and is designated as automotive-grade, providing additional reliability assurance. Active product status ensures availability. Selection of this substitute is appropriate for applications requiring automotive-grade reliability or where fast recovery performance is beneficial.

UG1A-E3/54 (Vishay General Semiconductor - Diodes Division)

The UG1A-E3/54 is a fast recovery diode with superior reverse recovery time (25 ns) compared to the HER101G-AP (50 ns) and lower forward voltage (950 mV at 1 A). All critical electrical parameters meet or exceed the original specification. Active product status and ROHS3 compliance are confirmed. This substitute is suitable for applications where improved switching performance and reduced forward voltage drop provide circuit benefits.

Frequently Asked Questions (FAQ)

Q: Can the 1N4001-T be used as a direct replacement for the HER101G-AP?

A: Yes. The 1N4001-T meets all critical electrical parameters: 50 V reverse voltage, 1 A average rectified current, 1 V maximum forward voltage at 1 A, and 5 µA reverse leakage current. Both parts are through-hole mounted in DO-41 packages. The primary difference is recovery speed (standard versus fast), which does not prevent substitution in most general-purpose rectification applications. However, Last Time Buy status indicates limited future availability.

Q: What is the difference between fast recovery and standard recovery diodes?

A: Recovery speed refers to the reverse recovery time (trr), which is the time required for a diode to transition from forward conduction to reverse blocking. The HER101G-AP has a fast recovery time of 50 ns, while the 1N4001-T has standard recovery (>500 ns). Fast recovery diodes are beneficial in high-frequency switching applications and power supplies where reduced switching losses are important. Standard recovery diodes are suitable for low-frequency rectification and general-purpose applications. Selection depends on circuit operating frequency and efficiency requirements.

Q: Are all substitute parts available in the same packaging format?

A: All listed substitute parts are through-hole mounted in DO-204AL or DO-41 axial packages, which are mechanically and electrically compatible with the HER101G-AP. Packaging format (Tape & Box, Cut Tape, or Tape & Reel) affects handling and assembly processes but does not affect electrical performance or board-level compatibility.

Q: Why is the HER101G-AP marked "Not For New Designs"?

A: "Not For New Designs" indicates that the manufacturer has discontinued active support for this component and recommends alternative parts for new product development. This status typically precedes full obsolescence. For ongoing maintenance of existing systems using HER101G-AP, substitute parts with active production status (such as 1N4001G or UG1A-E3/54) provide long-term supply security.

Q: Can the 1N4933GHA0G be used in non-automotive applications?

A: Yes. The 1N4933GHA0G meets all electrical specifications required for general-purpose rectification. AEC-Q101 automotive qualification indicates enhanced reliability testing and quality assurance, which provides additional confidence in performance. Automotive-qualified components are suitable for use in any application where their specifications match circuit requirements.

Q: What is the significance of the forward voltage difference between parts?

A: Forward voltage (Vf) affects power dissipation and voltage drop across the diode during conduction. The HER101G-AP and most substitutes are rated at 1 V maximum at 1 A. The UG1A-E3/54 has a lower forward voltage (950 mV), which reduces power loss by approximately 5%. The 1N4933GHA0G has a higher forward voltage (1.2 V), which increases power loss by approximately 20%. In low-current applications, this difference is negligible. In high-current or thermally constrained designs, forward voltage selection becomes more significant.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the environmental and regulatory status of the HER101G-AP. All parts are also REACH Unaffected and classified under ECCN EAR99 for export control purposes.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message