SD103C-TP Equivalent & Substitute Parts

Part Overview

The SD103C-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 20V DC reverse voltage and 15A average rectified current in a DO-35 through-hole package. This component is classified as obsolete, necessitating identification of equivalent alternatives for ongoing design requirements and production continuity. Substitute parts must maintain compatibility with the original electrical specifications and mechanical form factor while considering current product availability and compliance status.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	15	A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 200 mA	mV
Reverse Recovery Time (trr)	10	ns
Current - Reverse Leakage @ Vr	5	µA @ 10 V
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Operating Temperature - Junction (Max)	125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

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

Mandatory Compatibility Criteria:

Technology: Schottky diode
Package / Case: DO-35 (DO-204AH, Axial)
Mounting Type: Through Hole
Voltage - DC Reverse (Vr) (Max): Equal to or greater than 20V
Current - Average Rectified (Io): Equal to or greater than 15A

The substitute parts identified in this reference exhibit reduced current ratings (200mA to 500mA) compared to the SD103C-TP (15A). These parts share identical package geometry and voltage specifications but operate at significantly lower current levels. Substitution is applicable only in applications where the actual operating current requirement does not exceed the substitute part's rated current capacity. Direct one-to-one replacement without circuit redesign is not feasible for applications requiring the full 15A rating.

Parameter Comparison

Parameter	SD103C-TP (Main)	BAT42	DSB0.2A40	DSB0.5A20
Manufacturer	Micro Commercial Co	STMicroelectronics	Microchip Technology	Microchip Technology
Voltage - DC Reverse (Vr) (Max)	20 V	30 V	20 V	20 V
Current - Average Rectified (Io)	15 A	200 mA	200 mA	500 mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 200 mA	1 V @ 200 mA	510 mV @ 200 mA	650 mV @ 500 mA
Reverse Recovery Time (trr)	10 ns	5 ns	—	10 ns
Current - Reverse Leakage @ Vr	5 µA @ 10 V	500 nA @ 25 V	5 µA @ 40 V	10 µA @ 20 V
Package / Case	DO-35	DO-35	DO-35	DO-35
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature - Junction	125°C (Max)	-65°C ~ 125°C	-65°C ~ 125°C	-65°C ~ 125°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant

Engineering Selection Recommendations

Product Status Consideration: The SD103C-TP is classified as obsolete. All identified substitute parts (BAT42, DSB0.2A40, DSB0.5A20) maintain active product status, ensuring continued availability and manufacturing support.

Compliance Assessment: The BAT42 (STMicroelectronics) maintains ROHS3 compliance matching the original part. The DSB0.2A40 and DSB0.5A20 (Microchip Technology) are RoHS non-compliant. Selection between compliant and non-compliant alternatives depends on end-application regulatory requirements.

Current Rating Limitation: All substitute parts operate at current ratings significantly below the SD103C-TP specification (200mA to 500mA versus 15A). These substitutes are suitable only for applications where the actual operating current does not exceed the substitute part's rated capacity. Applications requiring the full 15A rating require alternative sourcing strategies or circuit redesign.

Voltage and Package Compatibility: All substitute parts share the DO-35 through-hole package and meet or exceed the 20V reverse voltage requirement. Mechanical and electrical interface compatibility is maintained.

Frequently Asked Questions (FAQ)

Q: Can the BAT42, DSB0.2A40, or DSB0.5A20 be used as direct replacements for the SD103C-TP in all applications?

A: No. While these parts share identical package geometry and voltage specifications, they are rated for significantly lower current levels (200mA to 500mA) compared to the SD103C-TP (15A). Direct replacement is limited to applications where the actual operating current does not exceed the substitute part's rating.

Q: What is the primary difference between the substitute parts?

A: The BAT42 is manufactured by STMicroelectronics and maintains ROHS3 compliance. The DSB0.2A40 and DSB0.5A20 are manufactured by Microchip Technology and are RoHS non-compliant. Current ratings differ: BAT42 and DSB0.2A40 are rated for 200mA, while DSB0.5A20 is rated for 500mA.

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

A: Yes. All substitute parts are packaged in DO-35 (DO-204AH, Axial) through-hole configuration, maintaining mechanical compatibility with the original SD103C-TP footprint.

Q: Which substitute part has the lowest forward voltage drop?

A: The DSB0.2A40 exhibits the lowest forward voltage drop at 510 mV @ 200 mA, compared to 600 mV for the SD103C-TP and 1 V for the BAT42.

Q: Does the BAT42 have a higher reverse voltage rating than the SD103C-TP?

A: Yes. The BAT42 is rated for 30V DC reverse voltage, exceeding the SD103C-TP specification of 20V. This provides additional voltage margin in applications operating near the maximum rating.

Q: What compliance certifications should be considered when selecting a substitute?

A: The BAT42 maintains ROHS3 compliance, matching the original part. The DSB0.2A40 and DSB0.5A20 are RoHS non-compliant. Selection depends on end-application regulatory requirements and regional compliance mandates.

Q: Can the substitute parts handle the same reverse recovery time as the SD103C-TP?

A: The BAT42 exhibits faster reverse recovery (5 ns versus 10 ns). The DSB0.5A20 matches the SD103C-TP at 10 ns. The DSB0.2A40 does not specify reverse recovery time in the provided data.

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