CDBD620-G Schottky Diode Equivalent & Substitute Parts

Part Overview

The CDBD620-G is a Schottky rectifier diode manufactured by Comchip Technology, rated for 20V DC reverse voltage and 6A average rectified current in a surface mount DPAK package. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. Schottky diodes in this voltage and current class are widely used in power supply circuits, DC-DC converters, and reverse polarity protection applications where fast recovery characteristics and low forward voltage drop are required.

Substiute Parts

CDBD620-G

Comchip TechnologyIn Stock: 1167CDBD620-G Datasheet

Current PartRFQ

VS-50WQ03FN-M3

Vishay General Semiconductor - Diodes DivisionIn Stock: 4644VS-50WQ03FN-M3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDBD620-G is determined by the following critical electrical and mechanical parameters:

Voltage Rating Compatibility: The substitute part must support the maximum reverse voltage (Vr) of the original circuit design. The CDBD620-G operates at 20V maximum reverse voltage. Substitute parts with equal or higher voltage ratings are acceptable, as they provide equivalent or improved voltage withstand capability.

Current Rating Compatibility: The substitute part must support the average rectified current (Io) required by the circuit. The CDBD620-G is rated for 6A. Substitute parts with equal or higher current ratings are acceptable.

Forward Voltage Drop: The substitute part's forward voltage drop (Vf) must be compatible with circuit design margins. Lower forward voltage drop values improve efficiency and reduce thermal dissipation.

Recovery Characteristics: Both the original and substitute parts must meet fast recovery specifications (≤ 500ns, > 200mA) to ensure compatibility in switching applications.

Package Compatibility: Both parts must use the same surface mount DPAK package (TO-252-3, SC-63) to ensure mechanical and thermal compatibility with existing PCB layouts.

Temperature Range: The substitute part's operating temperature range must encompass or exceed the original part's range (-55°C to 125°C).

Technology: Both parts must use Schottky diode technology to maintain electrical performance characteristics.

The VS-50WQ03FN-M3 meets all substitution criteria with higher voltage and temperature ratings, lower forward voltage drop, and identical packaging.

Parameter Comparison

Engineering Selection Recommendations

The VS-50WQ03FN-M3 is a suitable substitute for the obsolete CDBD620-G based on the following factors:

Voltage Rating: The VS-50WQ03FN-M3 is rated for 30V maximum reverse voltage, which exceeds the CDBD620-G's 20V rating. This provides additional voltage margin in circuit applications.

Current Rating: The VS-50WQ03FN-M3 is rated for 5.5A average rectified current, which is 0.5A lower than the CDBD620-G's 6A rating. In applications where the full 6A rating is required, this substitute may not be suitable. In applications where circuit current demand is 5.5A or less, this substitute is compatible.

Forward Voltage Drop: The VS-50WQ03FN-M3 exhibits a lower forward voltage drop (460 mV @ 5A) compared to the CDBD620-G (550 mV @ 6A), resulting in improved efficiency and reduced thermal dissipation.

Temperature Range: The VS-50WQ03FN-M3 supports an operating temperature range of -40°C to 150°C, which exceeds the CDBD620-G's -55°C to 125°C range. This provides additional thermal margin for high-temperature applications.

Package Compatibility: Both parts use identical DPAK surface mount packaging (TO-252-3, SC-63), ensuring direct PCB layout compatibility without redesign.

Product Status and Compliance: The VS-50WQ03FN-M3 is an active product with ROHS3 compliance, ensuring long-term availability and regulatory compliance for new designs.

Recovery Characteristics: Both parts meet identical fast recovery specifications (≤ 500ns, > 200mA), ensuring compatibility in switching applications.

Frequently Asked Questions (FAQ)

Q: Can the VS-50WQ03FN-M3 directly replace the CDBD620-G in all applications?

A: Direct replacement is possible in applications where the circuit current requirement does not exceed 5.5A. The CDBD620-G is rated for 6A, while the VS-50WQ03FN-M3 is rated for 5.5A. If the circuit requires the full 6A rating, alternative substitutes with higher current ratings must be evaluated.

Q: What is the impact of the lower forward voltage drop in the VS-50WQ03FN-M3?

A: The lower forward voltage drop (460 mV @ 5A versus 550 mV @ 6A) reduces power dissipation and heat generation in the diode. This improves overall circuit efficiency and may reduce thermal management requirements.

Q: Are the packages physically identical?

A: Yes. Both the CDBD620-G and VS-50WQ03FN-M3 use the TO-252-3 DPAK package (SC-63). No PCB layout modifications are required for mechanical compatibility.

Q: Does the higher voltage rating of the VS-50WQ03FN-M3 affect circuit performance?

A: No. A higher voltage rating (30V versus 20V) does not negatively affect circuit performance. The diode will operate within its rated specifications in circuits designed for 20V operation.

Q: What is the significance of the ROHS3 compliance of the VS-50WQ03FN-M3?

A: ROHS3 compliance indicates that the VS-50WQ03FN-M3 meets current environmental and regulatory standards for electronic components. This is important for new designs and applications subject to regulatory requirements.

Q: Are the recovery characteristics identical between the two parts?

A: Yes. Both parts meet the same fast recovery specification (≤ 500ns, > 200mA). They are compatible in switching applications requiring fast recovery performance.

Q: What is the difference in reverse leakage current between the two parts?

A: The CDBD620-G specifies 500 µA @ 20V, while the VS-50WQ03FN-M3 specifies 3 mA @ 30V. These measurements are taken at different voltage levels, making direct comparison inappropriate. Leakage current specifications are voltage-dependent.

Q: Is the VS-50WQ03FN-M3 available in the same packaging format?

A: Yes. The VS-50WQ03FN-M3 is supplied in Tube packaging, while the CDBD620-G packaging format is not specified in the provided data. Both parts use the identical TO-252-3 DPAK case style for surface mount applications.