SD103CWS-G3-18 Equivalent & Substitute Parts

Part Overview

The SD103CWS-G3-18 is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 20V DC reverse voltage and 350mA average rectified current in a surface mount SOD-323 package. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, manufacturing discontinuation, or design flexibility across multiple qualified suppliers.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	350	mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 200 mA	—
Reverse Recovery Time (trr)	10	ns
Package / Case	SC-76, SOD-323	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 125	°C

Substitute Part Grouping Explanation

Substitute parts for the SD103CWS-G3-18 are classified into two categories based on electrical parameter alignment:

Parametric Equivalents maintain identical electrical specifications across all critical parameters: 20V reverse voltage rating, 350mA average rectified current, 600mV forward voltage at 200mA, 10ns reverse recovery time, and -55°C to 125°C operating temperature range. These parts are direct functional replacements with no performance trade-offs. Parametric equivalents include SD103CWS-E3-08 (Vishay) and SD103CWSHE3-TP (Micro Commercial Co).

Manufacturer Recommended Alternatives provide higher current ratings (500mA) while maintaining the 20V voltage specification and SOD-323 package form factor. These parts include B0520WS-7-F (Diodes Incorporated) and PMEG2005AEA,115 (Nexperia USA Inc.). These alternatives are suitable for applications where the 350mA rating is conservative or where future design margin is required, provided the circuit topology accommodates the different forward voltage characteristics.

Substitution eligibility is determined by: (1) matching or exceeding the 20V reverse voltage rating, (2) current rating equal to or greater than 350mA, (3) identical SOD-323 package and surface mount configuration, (4) Schottky technology classification, and (5) ROHS3 compliance status.

Parameter Comparison

Parameter	SD103CWS-G3-18	SD103CWS-E3-08	SD103CWSHE3-TP	B0520WS-7-F	PMEG2005AEA,115
Manufacturer	Vishay	Vishay	Micro Commercial Co	Diodes Incorporated	Nexperia USA Inc.
Technology	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	20 V	20 V	20 V	20 V	20 V
Current - Average Rectified (Io)	350 mA	350 mA	350 mA	500 mA	500 mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 200 mA	600 mV @ 200 mA	600 mV @ 200 mA	430 mV @ 500 mA	390 mV @ 500 mA
Reverse Recovery Time (trr)	10 ns	10 ns	10 ns	≤ 500 ns	≤ 500 ns
Package / Case	SC-76, SOD-323	SC-76, SOD-323	SC-76, SOD-323	SC-76, SOD-323	SC-76, SOD-323
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction (Max)	125°C	125°C	125°C	125°C	150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents): SD103CWS-E3-08 and SD103CWSHE3-TP are functionally identical to the SD103CWS-G3-18 across all electrical and mechanical parameters. Both maintain Active product status and ROHS3 compliance. SD103CWSHE3-TP carries AEC-Q101 automotive qualification, making it suitable for automotive-grade applications. Selection between these parametric equivalents is based on availability, packaging format preference (Tape & Reel), and application-specific qualification requirements.

Higher Current Alternatives: B0520WS-7-F and PMEG2005AEA,115 provide 500mA current ratings, exceeding the 350mA specification of the primary part. Both maintain 20V reverse voltage rating, SOD-323 package compatibility, and ROHS3 compliance. B0520WS-7-F exhibits lower forward voltage (430mV @ 500mA) compared to the primary part. PMEG2005AEA,115 provides the lowest forward voltage (390mV @ 500mA) and highest maximum junction temperature (150°C). These alternatives are suitable for designs requiring enhanced current margin or improved thermal performance, provided circuit analysis confirms compatibility with the modified forward voltage characteristics.

All substitute parts maintain identical package form factor (SOD-323), surface mount configuration, and regulatory compliance status, enabling direct PCB-level substitution without layout modification.

Frequently Asked Questions (FAQ)

Q: Can SD103CWS-E3-08 be used as a direct replacement for SD103CWS-G3-18?

A: Yes. SD103CWS-E3-08 is a parametric equivalent with identical electrical specifications: 20V reverse voltage, 350mA average rectified current, 600mV forward voltage at 200mA, 10ns reverse recovery time, and -55°C to 125°C operating temperature range. Both use SOD-323 surface mount packaging. The parts are functionally interchangeable.

Q: What is the difference between parametric equivalents and manufacturer recommended alternatives?

A: Parametric equivalents (SD103CWS-E3-08, SD103CWSHE3-TP) match all electrical specifications of the primary part, including the 350mA current rating. Manufacturer recommended alternatives (B0520WS-7-F, PMEG2005AEA,115) provide higher 500mA current ratings with lower forward voltage characteristics. Alternatives are suitable when circuit design permits higher current capability or when improved forward voltage performance is beneficial.

Q: Is SD103CWSHE3-TP suitable for automotive applications?

A: Yes. SD103CWSHE3-TP carries AEC-Q101 automotive qualification and maintains identical electrical specifications to the primary part. It is classified as Automotive grade and is suitable for automotive-grade circuit implementations.

Q: Can B0520WS-7-F be used in place of SD103CWS-G3-18 without circuit modification?

A: B0520WS-7-F maintains the 20V reverse voltage rating and SOD-323 package compatibility. However, the forward voltage differs (430mV @ 500mA versus 600mV @ 200mA). Circuit analysis is required to confirm that the lower forward voltage and higher current rating do not adversely affect circuit performance, particularly in voltage regulation or current limiting applications.

Q: What is the maximum junction temperature difference between substitute parts?

A: The primary part and most substitutes operate to 125°C maximum junction temperature. PMEG2005AEA,115 extends to 150°C maximum junction temperature, providing 25°C additional thermal margin. This difference is relevant for high-temperature operating environments.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (SD103CWS-E3-08, SD103CWSHE3-TP, B0520WS-7-F, PMEG2005AEA,115) are ROHS3 compliant and maintain identical regulatory compliance status to the primary part.

Q: What packaging formats are available for substitute parts?

A: SD103CWS-E3-08 and SD103CWSHE3-TP are supplied in Tape & Reel (TR) format. B0520WS-7-F is supplied in Cut Tape (CT) and Digi-Reel® format. PMEG2005AEA,115 is supplied in Tape & Reel (TR) format. Packaging selection depends on assembly process requirements and volume specifications.

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