HER103G Equivalent & Substitute Parts

Part Overview

The HER103G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 200 V DC reverse voltage and 1 A average rectified current in a DO-204AL (DO-41) through-hole axial package. This component is classified as Active and complies with RoHS3 and REACH standards. The device features fast recovery characteristics with a reverse recovery time of 50 ns, making it suitable for standard rectification applications requiring moderate voltage and current ratings.

Substitute parts are necessary when the primary part number becomes unavailable due to inventory constraints, supply chain disruptions, or manufacturing discontinuation. Equivalent components with identical or superior electrical characteristics and compatible packaging enable design continuity and production flexibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	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 @ 200 V
Capacitance @ Vr, F	15	pF @ 4V, 1MHz
Package / Case	DO-204AL, DO-41, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the HER103G is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 200 V
Current - Average Rectified (Io): 1 A
Voltage - Forward (Vf) (Max) @ If: 1 V @ 1 A
Reverse Recovery Time (trr): 50 ns
Package / Case: DO-204AL, DO-41, Axial
Mounting Type: Through Hole
Operating Temperature - Junction: -55°C to 150°C
Technology: Standard

Acceptable Variation Parameters:

Current - Reverse Leakage @ Vr: Values at or below 5 µA @ 200 V are acceptable
Capacitance @ Vr, F: Values at or below 20 pF @ 4V, 1MHz are acceptable

All substitute parts listed maintain identical voltage, current, and thermal ratings. Variations in reverse leakage current and junction capacitance remain within acceptable engineering tolerances for general-purpose rectification applications. All substitute parts are supplied in compatible through-hole axial packages.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	C @ Vr [pF]	Package	Status
HER103G	Taiwan Semiconductor Corporation	200	1	1 @ 1 A	50	5 @ 200 V	15 @ 4V, 1MHz	DO-204AL (DO-41)	Active
UF1D	Taiwan Semiconductor Corporation	200	1	1 @ 1 A	50	5 @ 200 V	17 @ 4V, 1MHz	DO-204AL (DO-41)	Active
UF1DH	Taiwan Semiconductor Corporation	200	1	1 @ 1 A	50	5 @ 200 V	17 @ 4V, 1MHz	DO-204AL (DO-41)	Active
UF102G_R2_00001	Panjit International Inc.	200	1	1 @ 1 A	50	1 @ 200 V	17 @ 4V, 1MHz	DO-204AL (DO-41)	Active
UF4003-E3/54	Vishay General Semiconductor - Diodes Division	200	1	1 @ 1 A	50	10 @ 200 V	17 @ 4V, 1MHz	DO-204AL (DO-41)	Active
UF4003-E3/73	Vishay General Semiconductor - Diodes Division	200	1	1 @ 1 A	50	10 @ 200 V	17 @ 4V, 1MHz	DO-204AL (DO-41)	Active
UF4003-G	Comchip Technology	200	1	1 @ 1 A	50	5 @ 200 V	20 @ 4V, 1MHz	DO-204AL (DO-41)	Obsolete

Engineering Selection Recommendations

Primary Substitutes (Active Status):

UF1D and UF1DH from Taiwan Semiconductor Corporation are direct parametric equivalents to the HER103G with identical electrical characteristics. Both parts are Active and RoHS3 compliant. UF1DH carries AEC-Q101 automotive qualification, making it suitable for applications requiring automotive-grade reliability. These parts are recommended as first-choice substitutes due to manufacturer consistency and active product status.

UF102G_R2_00001 from Panjit International Inc. is an Active equivalent with superior reverse leakage performance (1 µA versus 5 µA), providing enhanced reliability margins. This part maintains all critical electrical parameters and is RoHS3 compliant.

UF4003-E3/54 and UF4003-E3/73 from Vishay General Semiconductor are Active equivalents with reverse leakage of 10 µA, which remains within acceptable tolerance. Both variants are RoHS3 compliant and suitable for general-purpose rectification.

Secondary Substitute (Obsolete Status):

UF4003-G from Comchip Technology is classified as Obsolete and should be selected only when other Active alternatives are unavailable. Despite obsolete status, this part maintains electrical equivalence with capacitance of 20 pF, which remains within acceptable limits. RoHS3 compliance is confirmed.

Compliance Considerations:

All substitute parts maintain RoHS3 compliance, REACH unaffected status, and identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications. Moisture sensitivity level remains at MSL 1 (Unlimited) across all alternatives, eliminating moisture-related handling constraints.

Frequently Asked Questions (FAQ)

Q: Can UF4003-E3/54 or UF4003-E3/73 be used as direct replacements for HER103G?

A: Yes. Both UF4003 variants maintain identical voltage (200 V), current (1 A), forward voltage (1 V @ 1 A), and recovery time (50 ns) specifications. The reverse leakage current of 10 µA is higher than the HER103G specification of 5 µA but remains within acceptable engineering tolerance for general-purpose rectification. Both parts are Active and RoHS3 compliant.

Q: What is the difference between UF1D and UF1DH?

A: UF1D and UF1DH are electrically identical with matching voltage, current, and thermal ratings. UF1DH carries AEC-Q101 automotive qualification, indicating compliance with automotive reliability standards. Select UF1DH for applications requiring automotive-grade components; UF1D is suitable for general industrial applications.

Q: Is UF102G_R2_00001 from Panjit International a suitable substitute?

A: Yes. UF102G_R2_00001 is an Active equivalent with superior reverse leakage performance (1 µA versus 5 µA at 200 V), providing enhanced reliability margins. All critical electrical parameters match the HER103G specification. The part is RoHS3 compliant and supplied in compatible DO-204AL (DO-41) through-hole axial packaging.

Q: Why is UF4003-G listed as Obsolete?

A: UF4003-G from Comchip Technology is classified as Obsolete by the manufacturer. While the part maintains electrical equivalence with acceptable capacitance of 20 pF, procurement may be limited. Active alternatives such as UF1D, UF102G_R2_00001, or UF4003-E3 variants are recommended for new designs and ongoing production.

Q: Are all substitute parts available in the same package as HER103G?

A: Yes. All substitute parts are supplied in DO-204AL (DO-41) through-hole axial packages, ensuring mechanical and electrical compatibility with existing PCB layouts and assembly processes. Mounting type remains Through Hole across all alternatives.

Q: What is the impact of higher reverse leakage current in UF4003-E3 variants?

A: UF4003-E3/54 and UF4003-E3/73 specify reverse leakage of 10 µA at 200 V, compared to 5 µA for the HER103G. This represents a 2x increase but remains within acceptable limits for general-purpose rectification applications. Higher leakage may result in marginally increased power dissipation in high-impedance circuits; however, for standard rectification duty, the difference is negligible.

Q: Do all substitute parts comply with RoHS3 and REACH requirements?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected. Moisture sensitivity level is MSL 1 (Unlimited) for all alternatives, eliminating moisture-related handling and storage constraints.

Q: Can substitute parts be mixed in the same production batch?

A: Yes. All substitute parts maintain identical electrical specifications for voltage, current, forward voltage, and recovery time. Mechanical compatibility is confirmed across all alternatives. However, design documentation and bill of materials should specify the selected part number to ensure traceability and consistency.

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