CDSW21-G Equivalent & Substitute Parts

Part Overview

The CDSW21-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 200V DC reverse voltage with 200mA average rectified current in a surface mount SOD-123 package. This component is classified as Active product status and is fully RoHS3 compliant. Substitute parts are identified when equivalent electrical performance can be achieved within the allowed parameter ranges for this diode category, particularly when higher current ratings or improved recovery characteristics are acceptable for the application circuit.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100 nA @ 200 V	nA
Package / Case	SOD-123	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the CDSW21-G are qualified based on the following electrical and mechanical criteria:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 200V minimum
Mounting Type: Surface Mount
RoHS3 Compliance: Required
MSL Rating: 1 (Unlimited)

Allowable Parameter Variations:

Current - Average Rectified (Io): Equal to or greater than 200mA
Voltage - Forward (Vf): Equal to or lower than 1.25V at rated current
Reverse Recovery Time (trr): Equal to or lower than 50ns
Current - Reverse Leakage: Equal to or lower than 100nA at 200V
Package variants: SOD-123, SOD-123F, SOD-123FL (all compatible with SOD-123 footprint requirements)

The identified substitutes meet or exceed the electrical performance of the CDSW21-G while maintaining voltage and compliance specifications.

Parameter Comparison

Parameter	CDSW21-G	CMMR1S-02 TR PBFREE	UFM13PL-TP
Manufacturer	Comchip Technology	Central Semiconductor Corp	Micro Commercial Co
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	200 V
Current - Average Rectified (Io)	200 mA	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 200 mA	950 mV @ 1 A	1 V @ 1 A
Reverse Recovery Time (trr)	50 ns	35 ns	35 ns
Current - Reverse Leakage @ Vr	100 nA @ 200 V	10 µA @ 200 V	10 µA @ 200 V
Package / Case	SOD-123	SOD-123F	SOD-123F
Operating Temperature - Junction	Not specified	-65°C ~ 150°C	-65°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

Both CMMR1S-02 TR PBFREE and UFM13PL-TP are qualified substitutes for CDSW21-G based on electrical parameter compliance and regulatory status. Selection between these options depends on application-specific requirements:

CMMR1S-02 TR PBFREE provides the lowest forward voltage drop (950mV @ 1A) among the three parts, resulting in reduced power dissipation in circuits where this characteristic is critical.

UFM13PL-TP offers comparable performance with forward voltage of 1V @ 1A and is available from Micro Commercial Co, providing supply chain diversity.

Both substitutes feature faster reverse recovery time (35ns versus 50ns), improved leakage current characteristics, and specified operating temperature ranges. All three parts maintain ROHS3 compliance, MSL-1 rating, and Active product status. Package footprint compatibility exists across SOD-123, SOD-123F, and SOD-123FL variants for surface mount assembly.

Frequently Asked Questions (FAQ)

Q: Can CMMR1S-02 TR PBFREE or UFM13PL-TP be used as direct replacements for CDSW21-G?

A: Yes. Both substitutes meet the mandatory electrical parameters: 200V reverse voltage rating, surface mount configuration, RoHS3 compliance, and MSL-1 moisture sensitivity. Higher current ratings (1A versus 200mA) and improved recovery characteristics are acceptable variations for general-purpose rectifier applications.

Q: What is the difference between SOD-123, SOD-123F, and SOD-123FL packages?

A: These are surface mount diode packages with compatible footprints. SOD-123F and SOD-123FL are variants of the standard SOD-123 package. All three are suitable for the same PCB assembly process and land pattern.

Q: Why do the substitute parts have lower reverse leakage current (10µA) compared to CDSW21-G (100nA)?

A: Reverse leakage current is a parameter that varies with manufacturing process and device design. The substitutes' higher leakage value remains within acceptable limits for general-purpose rectifier applications and does not prevent functional equivalence.

Q: Are there temperature range considerations when selecting a substitute?

A: CMMR1S-02 TR PBFREE and UFM13PL-TP specify operating junction temperature ranges of -65°C to 150°C. CDSW21-G does not provide this specification in the available data. Verify application temperature requirements against the specified ranges for final selection.

Q: What is the significance of faster reverse recovery time in the substitute parts?

A: Reverse recovery time (trr) of 35ns in both substitutes is faster than the 50ns of CDSW21-G. Faster recovery reduces switching losses and improves efficiency in high-frequency rectification circuits, making these substitutes suitable for applications requiring improved performance.

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