HER101-TP Equivalent & Substitute Parts

Part Overview

The HER101-TP is a general-purpose rectifier diode rated for 50 V DC reverse voltage and 1 A average rectified current, housed in a DO-41 axial through-hole package. Manufactured by Micro Commercial Co, this component is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. The HER101-TP features fast recovery characteristics with a reverse recovery time of 50 ns, making it suitable for applications requiring rapid switching performance in low-voltage rectification circuits.

Substiute Parts

HER101-TP

Micro Commercial CoIn Stock: 1038HER101-TP Datasheet

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1N4001G

Taiwan Semiconductor CorporationIn Stock: 16011N4001G Datasheet

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UG1A-M3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 1172UG1A-M3/54 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the HER101-TP is determined by equivalence in the following critical electrical and mechanical parameters:

Mandatory Equivalence Criteria:

• Voltage - DC Reverse (Vr) (Max): 50 V
• Current - Average Rectified (Io): 1 A
• Package / Case: DO-204AL, DO-41, Axial
• Mounting Type: Through Hole
• RoHS Status: ROHS3 Compliant

Secondary Compatibility Factors:

• Voltage - Forward (Vf) (Max) @ If: ≤ 1 V @ 1 A
• Operating Temperature - Junction: Minimum -55°C to maximum ≥ 125°C
• Reverse Recovery Time (trr): ≤ 500 ns (fast recovery capability)

The identified substitute parts meet all mandatory criteria and maintain electrical performance within the specified operating envelope. Differences in reverse recovery time and reverse leakage current represent performance variations within acceptable limits for general-purpose rectification applications.

Parameter Comparison

Engineering Selection Recommendations

1N4001G (Taiwan Semiconductor Corporation)

The 1N4001G is an active product offering direct electrical and mechanical compatibility with the HER101-TP. Both components share identical voltage and current ratings, package configuration, and RoHS3 compliance. The 1N4001G features an extended operating temperature range (-55 to 150°C versus -55 to 125°C) and significantly reduced reverse leakage current (5 µA versus 5 mA), representing improved performance characteristics. The primary distinction is the recovery speed classification: the 1N4001G operates as a standard recovery diode (>500 ns) compared to the HER101-TP's fast recovery specification (≤500 ns). This difference is acceptable for general-purpose rectification applications where switching speed is not a critical constraint. The 1N4001G is suitable for direct replacement in new designs and production continuity.

UG1A-M3/54 (Vishay General Semiconductor - Diodes Division)

The UG1A-M3/54 provides an alternative active substitute with enhanced performance characteristics. This component maintains identical voltage, current, and package specifications while offering superior fast recovery performance (25 ns reverse recovery time versus 50 ns) and lower forward voltage drop (950 mV versus 1 V at 1 A). The UG1A-M3/54 also features reduced junction capacitance (7 pF versus 20 pF) and an extended operating temperature range (-55 to 150°C). Reverse leakage current is improved to 5 µA. The UG1A-M3/54 is appropriate for applications where fast recovery characteristics and lower power dissipation are beneficial, and it maintains full compatibility with the HER101-TP footprint and electrical requirements.

Selection Basis:

Both substitute parts are active products with current manufacturing status, ensuring long-term availability and supply chain stability. Selection between 1N4001G and UG1A-M3/54 depends on application-specific requirements: the 1N4001G for cost-optimized general-purpose rectification, and the UG1A-M3/54 for applications benefiting from enhanced switching performance and reduced power dissipation.

Frequently Asked Questions (FAQ)

Q: Can the 1N4001G directly replace the HER101-TP in existing circuits?

A: Yes. The 1N4001G meets all mandatory electrical and mechanical compatibility criteria: 50 V reverse voltage rating, 1 A average rectified current, DO-41 axial through-hole package, and RoHS3 compliance. The primary difference is recovery speed classification (standard versus fast recovery), which does not affect functionality in general-purpose rectification applications. No circuit modifications are required.

Q: What is the significance of the reverse recovery time difference between HER101-TP and UG1A-M3/54?

A: The HER101-TP specifies 50 ns reverse recovery time, while the UG1A-M3/54 specifies 25 ns. Both are classified as fast recovery diodes (≤500 ns). The UG1A-M3/54's faster recovery reduces switching losses and improves efficiency in high-frequency applications. For low-frequency rectification, this difference has minimal practical impact.

Q: Why does the HER101-TP show 5 mA reverse leakage current while substitutes show 5 µA?

A: The HER101-TP specification lists 5 mA reverse leakage at 50 V, which is significantly higher than the 5 µA specified for 1N4001G and UG1A-M3/54. This represents a measurement or specification difference rather than a functional incompatibility. The substitute parts demonstrate superior leakage characteristics, resulting in lower standby current and reduced power dissipation.

Q: Are there temperature range limitations when substituting the HER101-TP?

A: The HER101-TP operates from -55 to 125°C. Both substitute parts extend the upper limit to 150°C, providing additional thermal margin. If the application operates within the HER101-TP's original temperature range, both substitutes are fully compatible. Applications requiring operation above 125°C benefit from the extended range of the substitute parts.

Q: What is the difference between DO-41 and DO-204AL package designations?

A: DO-41 and DO-204AL refer to the same physical package: a two-lead axial through-hole component with standardized dimensions. The designations are equivalent; DO-204AL is the formal JEDEC designation, while DO-41 is the legacy industry designation. All three parts (HER101-TP, 1N4001G, UG1A-M3/54) use this identical package.

Q: Can the UG1A-M3/54 be used in applications where the HER101-TP was originally specified?

A: Yes. The UG1A-M3/54 meets or exceeds all electrical and mechanical requirements of the HER101-TP. The improved performance characteristics (faster recovery, lower forward voltage, reduced leakage) make it suitable for direct substitution. No design changes are necessary.

Q: What is the impact of lower capacitance in substitute parts?

A: The HER101-TP specifies 20 pF junction capacitance, while 1N4001G specifies 10 pF and UG1A-M3/54 specifies 7 pF. Lower capacitance reduces switching transients and improves high-frequency performance. For low-frequency rectification applications, this difference is negligible. For circuits sensitive to capacitive coupling or operating at elevated frequencies, the lower capacitance of substitute parts provides improved performance.

Q: Is the packaging format (Tape & Reel) of substitute parts compatible with through-hole assembly?

A: Yes. Tape & Reel (TR) packaging refers to the supply format for automated assembly equipment. The physical component remains a through-hole axial diode in DO-41/DO-204AL package. Both manual and automated assembly processes can accommodate these components. The packaging format does not affect electrical or mechanical compatibility.