SD103C-TAP Schottky Diode Equivalent & Substitute Parts

Part Overview

The SD103C-TAP is an active Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 20 V DC reverse voltage and 200 mA average rectified current in a through-hole DO-35 package. This component is designed for applications requiring fast switching characteristics and low forward voltage drop typical of Schottky technology. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 200 mA	mV
Reverse Recovery Time (trr)	10	ns
Current - Reverse Leakage @ Vr	5	µA @ 10 V
Capacitance @ Vr, F	50	pF @ 0V, 1MHz
Package / Case	DO-204AH, DO-35, Axial	—
Mounting Type	Through Hole	—
Operating Temperature - Junction (Max)	125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of Schottky rectifier diodes is determined by the following critical parameters:

Voltage Rating Compatibility: The substitute part must have a DC reverse voltage rating (Vr) equal to or greater than the original part. The SD103C-TAP operates at 20 V maximum; substitute parts with higher voltage ratings (30 V, 40 V) are electrically compatible in this application.

Current Rating Compatibility: The substitute part must have an average rectified current rating (Io) equal to or greater than the original part requirement. The SD103C-TAP is rated for 200 mA; substitute parts with equal or higher current ratings satisfy this criterion.

Package and Mounting Compatibility: All substitute parts must use identical through-hole mounting in the DO-35 (DO-204AH) axial package to ensure mechanical and electrical connection compatibility.

Technology Consistency: All parts are Schottky diodes, ensuring consistent switching speed and forward voltage characteristics within the small-signal category.

Compliance and Certification: RoHS3 compliance and AEC-Q101 automotive qualification are considered for applications requiring these standards.

Parameter Comparison

Parameter	SD103C-TAP (Main)	1N5712	BAT42	BAT48
Manufacturer	Vishay General Semiconductor	Microchip Technology	STMicroelectronics	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	20 V	20 V	30 V	40 V
Current - Average Rectified (Io)	200 mA	75 mA	200 mA	350 mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 200 mA	1 V @ 35 mA	1 V @ 200 mA	750 mV @ 200 mA
Reverse Recovery Time (trr)	10 ns	—	5 ns	—
Current - Reverse Leakage @ Vr	5 µA @ 10 V	150 nA @ 16 V	500 nA @ 25 V	25 µA @ 40 V
Capacitance @ Vr, F	50 pF @ 0V, 1MHz	2 pF @ 0V, 1MHz	7 pF @ 1V, 1MHz	20 pF @ 0V, 1MHz
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	125°C (Max)	-65°C ~ 150°C	-65°C ~ 125°C	-65°C ~ 125°C
Technology	Schottky	Schottky	Schottky	Schottky
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Qualification	AEC-Q101	—	—	—

Engineering Selection Recommendations

BAT42 (STMicroelectronics): This part meets all substitution criteria for the SD103C-TAP. It provides equal current rating (200 mA), higher voltage rating (30 V), identical package (DO-35), and maintains ROHS3 compliance. The BAT42 is suitable for direct substitution in applications where the higher voltage rating and improved reverse recovery time (5 ns) are beneficial.

BAT48 (STMicroelectronics): This part exceeds the current and voltage requirements of the SD103C-TAP (350 mA at 40 V). It maintains ROHS3 compliance and identical package specifications. The BAT48 is suitable for substitution in applications requiring higher current capacity or voltage margin, though forward voltage characteristics differ slightly at the 200 mA operating point.

1N5712 (Microchip Technology): This part shares the 20 V voltage rating and DO-35 package with the SD103C-TAP but has a reduced current rating (75 mA). The 1N5712 is not suitable as a direct substitute for applications requiring the full 200 mA current capacity. Additionally, this part is RoHS non-compliant, which may restrict use in applications with RoHS compliance requirements. The 1N5712 is suitable only for applications with current requirements of 75 mA or less.

Compliance Considerations: The SD103C-TAP carries AEC-Q101 automotive qualification. Substitute parts BAT42 and BAT48 do not list this qualification in the provided data. Applications requiring AEC-Q101 certification should verify qualification status with the manufacturer before substitution.

Frequently Asked Questions (FAQ)

Q: Can the 1N5712 replace the SD103C-TAP in all applications?

A: No. The 1N5712 has a maximum average rectified current rating of 75 mA, which is insufficient for applications requiring the full 200 mA capacity of the SD103C-TAP. Additionally, the 1N5712 is RoHS non-compliant. Use the 1N5712 only in applications with current requirements of 75 mA or less and where RoHS compliance is not required.

Q: What is the primary difference between BAT42 and BAT48 as substitutes?

A: The BAT42 provides a voltage rating of 30 V and current rating of 200 mA, matching the current requirement of the SD103C-TAP with additional voltage margin. The BAT48 provides higher ratings at 40 V and 350 mA, offering greater design margin for both voltage and current. Both are ROHS3 compliant and use the DO-35 package. Selection depends on whether additional voltage or current capacity is beneficial for the application.

Q: Are all substitute parts in the same DO-35 package?

A: Yes. All substitute parts (1N5712, BAT42, BAT48) use the DO-204AH (DO-35) axial through-hole package, ensuring mechanical and electrical compatibility with the SD103C-TAP in PCB layouts and circuit designs.

Q: Does the SD103C-TAP have automotive qualification?

A: Yes. The SD103C-TAP carries AEC-Q101 qualification. The substitute parts BAT42 and BAT48 do not list AEC-Q101 qualification in the provided specifications. Verify automotive qualification requirements with the manufacturer before substituting in automotive applications.

Q: What is the impact of different forward voltage ratings on substitution?

A: Forward voltage differences affect power dissipation and circuit performance. The SD103C-TAP has 600 mV forward voltage at 200 mA, while BAT42 and BAT48 have 1 V at 200 mA. In low-voltage or high-efficiency applications, this difference may be significant. The 1N5712 has 1 V forward voltage but at only 35 mA, making direct comparison at 200 mA not applicable.

Q: Can I use BAT48 in place of SD103C-TAP for a 20 V application?

A: Yes. The BAT48 has a 40 V maximum reverse voltage rating, which exceeds the 20 V requirement. The 350 mA current rating also exceeds the 200 mA requirement. The BAT48 is electrically compatible and mechanically identical in the DO-35 package. However, verify that the higher forward voltage (750 mV at 200 mA) does not negatively impact circuit performance.

Q: What is the significance of reverse recovery time in these diodes?

A: Reverse recovery time (trr) affects switching speed and high-frequency performance. The SD103C-TAP has 10 ns trr, while the BAT42 has 5 ns. Faster recovery time reduces switching losses and improves performance in high-frequency applications. The 1N5712 and BAT48 do not provide trr specifications in the available data.

Q: Are there inventory considerations for these substitute parts?

A: Yes. The SD103C-TAP has 11,331 pieces in stock, BAT42 has 45,200 pieces, BAT48 has 27,200 pieces, and 1N5712 has 9,300 pieces. Availability may influence substitution decisions based on supply chain requirements.

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