SD103A-TP Equivalent & Substitute Parts

Part Overview

The SD103A-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 40 V DC reverse voltage and 15 A average rectified current in a DO-35 through-hole package. This component is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and procurement continuity. The SD103A-TP serves applications requiring fast recovery Schottky rectification with moderate to high current capacity in compact axial form factor.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	15	A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 200 mA	mV @ mA
Reverse Recovery Time (trr)	10	ns
Current - Reverse Leakage @ Vr	5 µA @ 30 V	µA @ V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
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 of the SD103A-TP is constrained by the following critical parameters: voltage rating (40 V minimum), current capacity (15 A minimum), package type (DO-35 through-hole), and speed classification (fast recovery). The substitute parts identified in this reference fall into distinct categories based on electrical capability:

Direct Substitutes (Voltage and Current Compatible): Parts meeting or exceeding both the 40 V reverse voltage and 15 A current specifications while maintaining DO-35 packaging and fast recovery characteristics.

Functional Alternatives (Reduced Current Rating): Parts with 40 V or higher voltage rating but lower current capacity (below 15 A), suitable for applications where the full 15 A specification is not required.

Lower Voltage Alternatives (Reduced Voltage Rating): Parts rated at 20 V to 30 V reverse voltage with varying current capacities, applicable only to circuits operating at reduced voltage levels.

The following parameters determine substitution validity:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed application requirement
Current - Average Rectified (Io): Must equal or exceed application requirement
Package / Case: Must be DO-35 or equivalent axial through-hole form factor
Speed Classification: Fast recovery preferred for high-frequency switching applications
Mounting Type: Through hole required for this reference

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A/mA]	Vf (Max) @ If	trr [ns]	Speed Class	Product Status	RoHS Status
SD103A-TP	Micro Commercial Co	40	15 A	600 mV @ 200 mA	10	Fast Recovery ≤ 500ns, > 200mA	Obsolete	ROHS3 Compliant
SD103B-F	Diodes Incorporated	30	350 mA	600 mV @ 200 mA	10	Fast Recovery ≤ 500ns, > 200mA	Discontinued at DiGi Electronics	ROHS3 Compliant
1N5712	Microchip Technology	20	75 mA	1 V @ 35 mA	—	Small Signal ≤ 200mA, Any Speed	Active	RoHS non-compliant
1N5712-1	Microchip Technology	20	75 mA	1 V @ 35 mA	—	Small Signal ≤ 200mA, Any Speed	Active	RoHS non-compliant
1N6857-1	Microchip Technology	20	150 mA	750 mV @ 35 mA	—	Small Signal ≤ 200mA, Any Speed	Active	RoHS non-compliant
DSB0.2A20	Microchip Technology	20	200 mA	500 mV @ 200 mA	—	Small Signal ≤ 200mA, Any Speed	Active	RoHS non-compliant
DSB0.2A40	Microchip Technology	20	200 mA	510 mV @ 200 mA	—	Small Signal ≤ 200mA, Any Speed	Active	RoHS non-compliant
DSB0.5A20	Microchip Technology	20	500 mA	650 mV @ 500 mA	—	Fast Recovery ≤ 500ns, > 200mA	Active	RoHS non-compliant
DSB2810	Microchip Technology	20	75 mA	410 mV @ 1 mA	—	Small Signal ≤ 200mA, Any Speed	Active	RoHS non-compliant
DSB5712	Microchip Technology	20	75 mA	1 V @ 35 mA	—	Small Signal ≤ 200mA, Any Speed	Active	RoHS non-compliant

Engineering Selection Recommendations

Obsolescence Status: The SD103A-TP is classified as obsolete. The SD103B-F from Diodes Incorporated represents a direct manufacturer alternative but is discontinued at DiGi Electronics. All Microchip Technology parts listed (1N5712, 1N5712-1, 1N6857-1, DSB0.2A20, DSB0.2A40, DSB0.5A20, DSB2810, DSB5712) maintain active product status.

Compliance Considerations: The SD103A-TP carries ROHS3 compliance certification. The SD103B-F also maintains ROHS3 compliance. All Microchip Technology substitute parts are RoHS non-compliant. Applications requiring RoHS compliance must retain the SD103A-TP or select the SD103B-F where voltage and current derating is acceptable.

Current Capacity Limitations: No substitute part in the active product portfolio matches the 15 A current rating of the SD103A-TP. The highest-capacity active alternative is DSB0.5A20 at 500 mA. Selection of substitute parts requires circuit redesign or parallel configuration of multiple devices to achieve equivalent current handling.

Voltage Rating Considerations: The SD103A-TP operates at 40 V maximum reverse voltage. All active Microchip alternatives are rated at 20 V maximum. The SD103B-F is rated at 30 V. Applications operating above 20 V require either the SD103B-F (up to 30 V) or retention of the original SD103A-TP specification.

Package Compatibility: All listed parts maintain DO-35 through-hole axial packaging, ensuring mechanical and thermal interface compatibility with existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the 1N5712 or 1N5712-1 directly replace the SD103A-TP?

A: No. The 1N5712 and 1N5712-1 are rated at 20 V maximum reverse voltage and 75 mA average rectified current, compared to the SD103A-TP specification of 40 V and 15 A. These parts are suitable only for low-voltage, low-current applications and do not provide electrical equivalence.

Q: What is the highest-current active substitute available?

A: The DSB0.5A20 from Microchip Technology provides the highest current capacity among active products at 500 mA, still significantly below the SD103A-TP rating of 15 A. Applications requiring full 15 A capacity cannot be satisfied by single-device substitution.

Q: Is the SD103B-F a suitable replacement?

A: The SD103B-F is electrically limited to 30 V reverse voltage and 350 mA average rectified current. It is suitable only for applications operating at or below these ratings. The SD103B-F is discontinued at DiGi Electronics, limiting long-term procurement viability. This part maintains ROHS3 compliance.

Q: Why are the Microchip alternatives rated at lower voltage and current?

A: The Microchip product line includes parts optimized for different application segments. The 20 V maximum rating reflects design for lower-voltage switching supplies and logic-level circuits. The 15 A capability of the SD103A-TP targets higher-power rectification applications not addressed by the active Microchip portfolio.

Q: Do all substitute parts maintain the same package footprint?

A: Yes. All listed parts use DO-35 through-hole axial packaging (DO-204AH designation), ensuring identical PCB mounting compatibility. No layout modifications are required for package accommodation.

Q: What compliance certifications differ between the main part and substitutes?

A: The SD103A-TP and SD103B-F are ROHS3 compliant. All Microchip Technology parts (1N5712, 1N5712-1, 1N6857-1, DSB series) are RoHS non-compliant. Applications subject to RoHS requirements cannot use Microchip alternatives without design modification or exemption documentation.

Q: Can multiple lower-rated parts be paralleled to achieve 15 A capacity?

A: Parallel configuration of Schottky diodes requires careful thermal and current-sharing analysis. Current-sharing is not inherent in Schottky devices due to positive temperature coefficient of forward voltage. Parallel operation is not recommended without additional current-limiting or balancing circuitry.

Q: What is the reverse recovery time difference between the SD103A-TP and alternatives?

A: The SD103A-TP specifies 10 ns reverse recovery time with fast recovery classification. The Microchip 1N5712, 1N5712-1, 1N6857-1, DSB2810, and DSB5712 parts do not specify reverse recovery time and are classified as small signal devices. The DSB0.5A20 specifies fast recovery classification but does not provide trr data. Applications sensitive to reverse recovery characteristics should retain the SD103A-TP specification.

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