SD103CW-13 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SD103CW-13 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 20V DC reverse voltage and 350mA average rectified current in a surface mount SOD-123 package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	350	mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 200 mA	mV @ mA
Reverse Recovery Time (trr)	10	ns
Current - Reverse Leakage @ Vr	5	µA @ 10 V
Capacitance @ Vr, F	28	pF @ 0V, 1MHz
Package / Case	SOD-123	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 125	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the SD103CW-13 is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 20V minimum
Current - Average Rectified (Io): 350mA minimum
Package / Case: SOD-123 or SOD-123F
Mounting Type: Surface Mount
Technology: Schottky

Acceptable Variation Parameters:

Voltage - Forward (Vf): May vary within application tolerance
Reverse Recovery Time (trr): Fast Recovery ≤ 500ns maintained
Current - Reverse Leakage: May vary
Capacitance: May vary
Operating Temperature Range: May exceed specified range

Substitute parts are grouped into three categories:

Parametric Equivalents (Diodes Incorporated): Identical electrical specifications with different packaging configurations (Tape & Reel vs. Cut Tape).
Direct Manufacturer Alternatives (Micro Commercial Co / Comchip Technology / Nexperia / onsemi): Parts meeting or exceeding the 20V/350mA specification with compatible SOD-123 packaging and Schottky technology.
Higher Current Rated Alternatives: Parts rated for 500mA or 1A that maintain 20V reverse voltage, providing design margin for applications requiring increased current capacity.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [mV @ mA]	trr [ns]	Package	Product Status	RoHS Status
SD103CW-13	Diodes Incorporated	20	350	600 @ 200	10	SOD-123	Discontinued	Non-compliant
SD103CW-13-F	Diodes Incorporated	20	350	600 @ 200	10	SOD-123	Active	ROHS3 Compliant
SD103CW-7-F	Diodes Incorporated	20	350	600 @ 200	10	SOD-123	Active	ROHS3 Compliant
SD103AW-TP	Micro Commercial Co	40	350	600 @ 200	10	SOD-123	Active	ROHS3 Compliant
SD103CW-TP	Micro Commercial Co	20	350	600 @ 200	10	SOD-123	Active	ROHS3 Compliant
CDBW0520L-G	Comchip Technology	20	500	385 @ 500	≤ 500	SOD-123	Active	ROHS3 Compliant
MBR0520-TP	Micro Commercial Co	20	500	450 @ 500	≤ 500	SOD-123	Active	ROHS3 Compliant
MBR0520L-TP	Micro Commercial Co	20	500	385 @ 500	≤ 500	SOD-123	Active	ROHS3 Compliant
MBRX120LF-TP	Micro Commercial Co	20	1000	360 @ 1000	≤ 500	SOD-123	Active	ROHS3 Compliant
PMEG2005EH,115	Nexperia USA Inc.	20	500	390 @ 500	≤ 500	SOD-123F	Active	ROHS3 Compliant
SBR80520LT1G	onsemi	20	500	385 @ 500	≤ 500	SOD-123	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Identical Specifications):

The SD103CW-13-F and SD103CW-7-F from Diodes Incorporated are parametric equivalents of the discontinued SD103CW-13. Both maintain identical electrical specifications (20V, 350mA, 600mV forward voltage) and SOD-123 packaging. These parts are Active products with ROHS3 compliance, making them suitable for direct substitution in existing designs. The primary difference is packaging format: SD103CW-13-F is supplied in Tape & Reel, while SD103CW-7-F is supplied in Cut Tape & Digi-Reel.

Equivalent Alternatives (Same Voltage and Current Rating):

The SD103CW-TP from Micro Commercial Co provides identical electrical performance (20V, 350mA) in SOD-123 packaging with Active product status and ROHS3 compliance. This part is suitable for direct substitution where manufacturer flexibility is acceptable.

The SD103AW-TP from Micro Commercial Co offers higher reverse voltage rating (40V) while maintaining 350mA current capacity. This part is suitable for applications where increased voltage margin is beneficial, though it is not required for 20V operation.

Higher Current Alternatives (500mA and 1A Ratings):

Parts rated for 500mA (CDBW0520L-G, MBR0520-TP, MBR0520L-TP, PMEG2005EH,115, SBR80520LT1G) and 1A (MBRX120LF-TP) exceed the 350mA specification while maintaining 20V reverse voltage and SOD-123 packaging. These parts are suitable for applications requiring increased current capacity or design margin. All are Active products with ROHS3 compliance.

Compliance Considerations:

The original SD103CW-13 is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, meeting current regulatory requirements for new designs and production.

Frequently Asked Questions (FAQ)

Q: Can I use a 500mA rated diode in place of the 350mA SD103CW-13?

A: Yes. Parts rated for 500mA (such as MBR0520L-TP, CDBW0520L-G, or SBR80520LT1G) are direct substitutes for the 350mA SD103CW-13. The higher current rating provides design margin and does not affect operation at 350mA or below. All maintain 20V reverse voltage and SOD-123 packaging.

Q: What is the difference between SD103CW-13-F and SD103CW-7-F?

A: Both parts are parametric equivalents with identical electrical specifications. The difference is packaging format: SD103CW-13-F is supplied in Tape & Reel (TR), while SD103CW-7-F is supplied in Cut Tape (CT) & Digi-Reel. Selection depends on assembly equipment and procurement requirements.

Q: Can I use the SD103AW-TP (40V) instead of the SD103CW-13 (20V)?

A: Yes. The SD103AW-TP is a direct substitute with identical 350mA current rating and SOD-123 packaging. The higher 40V reverse voltage rating provides additional voltage margin and is fully compatible with 20V applications.

Q: Is the PMEG2005EH,115 compatible with the SD103CW-13?

A: Yes. The PMEG2005EH,115 is a 500mA rated Schottky diode with 20V reverse voltage in SOD-123F packaging. It is compatible with the SD103CW-13 for applications requiring 350mA or higher current capacity. Note that the package designation is SOD-123F rather than SOD-123; verify PCB footprint compatibility.

Q: Why should I choose the MBRX120LF-TP (1A) over the 500mA alternatives?

A: The MBRX120LF-TP provides the highest current capacity (1A) in SOD-123 packaging with the lowest forward voltage drop (360mV @ 1A). Selection depends on application current requirements and thermal management considerations. For 350mA operation, 500mA alternatives are typically sufficient.

Q: Are all substitute parts RoHS compliant?

A: Yes. All recommended substitute parts are ROHS3 compliant. The original SD103CW-13 is RoHS non-compliant, making substitution necessary for new designs meeting current regulatory requirements.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging is supplied on continuous tape suitable for automated pick-and-place assembly. Cut Tape (CT) & Digi-Reel packaging is supplied in shorter tape segments. Selection depends on assembly volume and equipment compatibility. Both formats contain identical components.

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