SD103C-A-F Equivalent & Substitute Parts

Part Overview

The SD103C-A-F is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 20 V DC reverse voltage and 350 mA average rectified current in a DO-35 through-hole package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent substitute components that maintain functional compatibility within the same electrical and mechanical specifications. Substitute parts must satisfy the core electrical parameters: reverse voltage rating, forward current capacity, and package form factor.

Key Parameters

Parameter	SD103C-A-F
Voltage - DC Reverse (Vr) (Max)	20 V
Current - Average Rectified (Io)	350 mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 200 mA
Technology	Schottky
Reverse Recovery Time (trr)	10 ns
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial
Operating Temperature - Junction (Max)	125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SD103C-A-F is determined by the following critical parameters:

Primary Electrical Criteria:

Voltage - DC Reverse (Vr) rating must equal or exceed 20 V
Current - Average Rectified (Io) rating must equal or exceed 350 mA
Technology must be Schottky diode
Package must be DO-35 (DO-204AH) through-hole axial configuration

Secondary Compatibility Factors:

Forward voltage characteristics at specified current levels
Reverse recovery time performance
Operating temperature range
Regulatory compliance (RoHS, REACH)

The substitute parts listed (1N5712, 1N5712-1, and BAT42) share identical package geometry and Schottky technology. However, current rating differences create distinct substitution scenarios that must be evaluated based on circuit application requirements.

Parameter Comparison

Parameter	SD103C-A-F	1N5712	1N5712-1	BAT42
Manufacturer	Diodes Incorporated	Microchip Technology	Microchip Technology	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	20 V	20 V	20 V	30 V
Current - Average Rectified (Io)	350 mA	75 mA	75 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 200 mA	1 V @ 35 mA	1 V @ 35 mA	1 V @ 200 mA
Technology	Schottky	Schottky	Schottky	Schottky
Reverse Recovery Time (trr)	10 ns	Not specified	Not specified	5 ns
Current - Reverse Leakage @ Vr	5 µA @ 10 V	150 nA @ 16 V	150 nA @ 16 V	500 nA @ 25 V
Capacitance @ Vr, F	50 pF @ 0V, 1MHz	2 pF @ 0V, 1MHz	2 pF @ 0V, 1MHz	7 pF @ 1V, 1MHz
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial	DO-204AH, DO-35, Axial
Operating Temperature - Junction	125°C (Max)	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 125°C
Product Status	Discontinued at DiGi Electronics	Active	Active	Active
RoHS Status	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

BAT42 (STMicroelectronics): This substitute provides the closest electrical match to the SD103C-A-F. The BAT42 exceeds the reverse voltage requirement (30 V vs. 20 V) and delivers 200 mA average rectified current. While this falls short of the original 350 mA specification, the BAT42 maintains compatibility with applications requiring current levels up to 200 mA. The BAT42 is ROHS3 compliant, matching the original part's regulatory status. Product status is active with high inventory availability (45,200 pcs). Operating temperature range (-65°C to 125°C) aligns with the original maximum junction temperature of 125°C.

1N5712 and 1N5712-1 (Microchip Technology): Both variants are electrically identical, differing only in packaging (bulk vs. cut tape). These parts share the 20 V reverse voltage rating but provide only 75 mA average rectified current, substantially below the original 350 mA specification. These substitutes are suitable only for applications where circuit current demands do not exceed 75 mA. Both parts are active with strong inventory availability. However, both are RoHS non-compliant, creating a regulatory divergence from the original ROHS3 compliant SD103C-A-F. Operating temperature range extends to 150°C, exceeding the original specification.

Regulatory and Compliance Considerations: The SD103C-A-F is ROHS3 compliant. The BAT42 maintains this compliance status. The 1N5712 and 1N5712-1 are RoHS non-compliant and introduce regulatory risk in applications subject to RoHS requirements. All substitute parts maintain REACH unaffected status and EAR99 export classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can the 1N5712 or 1N5712-1 directly replace the SD103C-A-F in all applications?

A: No. The 1N5712 and 1N5712-1 are rated for 75 mA average rectified current, while the SD103C-A-F is rated for 350 mA. These substitutes are compatible only with circuits designed for maximum current levels not exceeding 75 mA. Exceeding this current rating will cause device failure.

Q: Is the BAT42 a suitable substitute for the SD103C-A-F?

A: The BAT42 is suitable for applications requiring current levels up to 200 mA. The BAT42 exceeds the reverse voltage requirement (30 V vs. 20 V) and maintains ROHS3 compliance. However, applications requiring the full 350 mA rating of the original part cannot use the BAT42 without circuit redesign.

Q: Are there package compatibility concerns between the SD103C-A-F and substitute parts?

A: No. All substitute parts use the DO-35 (DO-204AH) axial through-hole package, identical to the original SD103C-A-F. Direct mechanical substitution is possible without PCB modification.

Q: What is the impact of RoHS compliance differences?

A: The SD103C-A-F is ROHS3 compliant. The BAT42 maintains this compliance. The 1N5712 and 1N5712-1 are RoHS non-compliant. In applications subject to RoHS directives or customer requirements, the 1N5712 variants introduce regulatory risk and may not be acceptable.

Q: How do forward voltage characteristics differ between the SD103C-A-F and substitutes?

A: The SD103C-A-F specifies 600 mV maximum forward voltage at 200 mA. The BAT42 specifies 1 V maximum at 200 mA, representing a 400 mV increase. The 1N5712 variants specify 1 V at 35 mA. Forward voltage differences affect power dissipation and circuit performance in high-current applications.

Q: What is the significance of reverse recovery time differences?

A: The SD103C-A-F specifies 10 ns reverse recovery time. The BAT42 specifies 5 ns, indicating faster switching performance. The 1N5712 variants do not specify reverse recovery time. In high-frequency switching applications, faster recovery time reduces switching losses and improves efficiency.

Q: Can the BAT42 be used in applications requiring the full 350 mA rating?

A: No. The BAT42 is rated for 200 mA maximum average rectified current. Using the BAT42 in circuits requiring 350 mA will exceed device ratings and cause failure. Circuit redesign or use of alternative components rated for 350 mA or higher is required.

Q: What inventory considerations apply to these substitutes?

A: The BAT42 has the highest inventory availability (45,200 pcs), followed by the 1N5712 (9,300 pcs) and 1N5712-1 (2,932 pcs). The original SD103C-A-F has 689 pcs available but is discontinued. For long-term supply assurance, the BAT42 offers the most reliable availability.

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