SR103H Schottky Diode Equivalent & Substitute Parts

Part Overview

The SR103H is an active-status Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 30 V DC reverse voltage and 1 A average rectified current in a through-hole DO-204AL (DO-41) axial package. This component is qualified to AEC-Q101 automotive standards and complies with ROHS3 and REACH regulations. Equivalent and substitute parts are identified based on matching electrical performance characteristics, mechanical compatibility, and regulatory compliance to support procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	30	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 1 A	—
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	—
Current - Reverse Leakage @ Vr	500 µA @ 30 V	—
Operating Temperature - Junction	−55 to 125	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
RoHS Status	ROHS3 Compliant	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitute parts for the SR103H are qualified based on the following electrical and mechanical parameters:

Electrical Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 30 V
Current - Average Rectified (Io): 1 A
Voltage - Forward (Vf) (Max) @ If: 550 mV @ 1 A
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)
Operating Temperature - Junction: −55 to 125 °C
Technology: Schottky

Mechanical Compatibility Criteria:

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

Regulatory Compliance Criteria:

RoHS Status: ROHS3 Compliant
REACH Status: REACH Unaffected
Product Status: Active

All identified substitute parts meet these criteria and are therefore electrically and mechanically interchangeable with the SR103H in applications requiring a 30 V, 1 A Schottky rectifier diode in a through-hole axial package.

Parameter Comparison

Parameter	SR103H (Taiwan Semiconductor)	1N5818-TP (Micro Commercial Co)	1N5818_R2_00001 (Panjit International)
Manufacturer Part Number	SR103H	1N5818-TP	1N5818_R2_00001
Technology	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	30 V	30 V	30 V
Current - Average Rectified (Io)	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 1 A	550 mV @ 1 A	550 mV @ 1 A
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)	Fast Recovery ≤ 500 ns, > 200 mA (Io)
Current - Reverse Leakage @ Vr	500 µA @ 30 V	1 mA @ 30 V	200 µA @ 30 V
Operating Temperature - Junction	−55 to 125 °C	−55 to 125 °C	−55 to 125 °C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three diodes listed—SR103H, 1N5818-TP, and 1N5818_R2_00001—are active-status products with ROHS3 compliance and REACH unaffected status, making them suitable for current procurement and deployment in regulated applications.

SR103H (Taiwan Semiconductor Corporation): Carries AEC-Q101 automotive qualification and is designated as an automotive-grade component. This part is appropriate for applications requiring explicit automotive certification.

1N5818-TP (Micro Commercial Co): Meets all electrical and mechanical parameters. Packaging is specified as Cut Tape (CT). This part is appropriate for high-volume automated assembly operations.

1N5818_R2_00001 (Panjit International Inc.): Meets all electrical and mechanical parameters. Packaging is specified as Cut Tape (CT). This part is appropriate for high-volume automated assembly operations.

Selection between these parts depends on procurement availability, packaging format requirements (axial bulk versus cut tape), and whether automotive-grade certification is mandated by application specifications.

Frequently Asked Questions (FAQ)

Q: Can the 1N5818-TP substitute for the SR103H in automotive applications?

A: The 1N5818-TP meets all electrical and mechanical parameters of the SR103H. However, the SR103H carries explicit AEC-Q101 automotive qualification, while the 1N5818-TP does not list this certification. Applications requiring documented automotive-grade components should specify the SR103H or verify that automotive qualification is not a contractual requirement.

Q: What is the difference in reverse leakage current between these parts?

A: The SR103H specifies 500 µA @ 30 V, the 1N5818_R2_00001 specifies 200 µA @ 30 V, and the 1N5818-TP specifies 1 mA @ 30 V. All values remain within acceptable operating ranges for Schottky diodes at rated voltage. Applications sensitive to leakage current should select the part with the lowest specified value.

Q: Are these parts mechanically interchangeable?

A: Yes. All three parts use the DO-204AL (DO-41) axial through-hole package. Physical dimensions and lead spacing are identical, allowing direct substitution in PCB layouts and through-hole assembly processes.

Q: What packaging formats are available?

A: The SR103H is supplied in standard axial bulk packaging. The 1N5818-TP and 1N5818_R2_00001 are supplied in Cut Tape (CT) format. Cut Tape packaging is optimized for automated pick-and-place assembly, while bulk axial packaging is suitable for manual assembly or reel-fed processes.

Q: Do all parts comply with environmental regulations?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance restrictions for electronic components in regulated markets.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, provided that automotive-grade certification is not a design requirement. All parts share identical electrical ratings, forward voltage characteristics, reverse voltage ratings, and operating temperature ranges. Mechanical compatibility is confirmed through identical package specifications.

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