CDBD2020-HF Equivalent & Substitute Parts

Part Overview

The CDBD2020-HF is a Schottky diode array manufactured by Comchip Technology, configured as 1 pair common cathode with a maximum reverse voltage rating of 20 V and average rectified current of 20 A per diode. The device is packaged in TO-263-3 (D2PAK) surface mount configuration with 2 leads plus tab.

This part is classified as obsolete. Identifying equivalent and substitute components is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode array configuration.

Substiute Parts

CDBD2020-HF

Comchip TechnologyIn Stock: 1103CDBD2020-HF Datasheet

Current PartRFQ

SB2540DC

SMC Diode SolutionsIn Stock: 743SB2540DC Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDBD2020-HF is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Diode Configuration: 1 Pair Common Cathode (electrical topology must match)
• Technology: Schottky (device physics and performance characteristics)
• Package / Case: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB (physical and thermal interface)
• Mounting Type: Surface Mount (assembly process compatibility)

Allowable Parameter Ranges for Substitution:

• Voltage - DC Reverse (Vr) (Max): Must be equal to or greater than 20 V
• Current - Average Rectified (Io) (per Diode): Must be equal to or greater than 20 A
• Voltage - Forward (Vf) (Max) @ If: Must be equal to or less than 550 mV at the specified current
• Speed: Must maintain Fast Recovery ≤ 500ns, > 200mA (Io)
• Current - Reverse Leakage @ Vr: Must be equal to or less than 500 µA at the rated voltage
• Operating Temperature - Junction: Must encompass or exceed -55°C ~ 125°C range
• Moisture Sensitivity Level (MSL): Must be 1 (Unlimited) or equivalent

The substitute part SB2540DC meets all mandatory compatibility criteria and exceeds performance specifications in voltage, current, and temperature ratings, making it a direct substitute for the obsolete CDBD2020-HF.

Parameter Comparison

Engineering Selection Recommendations

SB2540DC as Primary Substitute:

The SB2540DC from SMC Diode Solutions is a direct substitute for the obsolete CDBD2020-HF. Selection is based on the following engineering factors:

1. Electrical Compatibility: The SB2540DC maintains identical diode configuration (1 pair common cathode), technology (Schottky), and switching speed characteristics. Voltage and current ratings exceed the original specification, providing design margin without introducing incompatibility.

2. Package Compatibility: Both devices utilize identical TO-263-3 (D2PAK) surface mount packaging with 2 leads plus tab. PCB footprints, thermal interface characteristics, and assembly processes are directly compatible.

3. Product Status: The CDBD2020-HF is obsolete with no ongoing production. The SB2540DC is in active production status, ensuring long-term supply chain availability and consistent manufacturing quality.

4. Compliance Status: The SB2540DC is ROHS3 compliant and REACH affected, meeting current regulatory requirements for new designs and production. The original part's compliance status is not specified.

5. Thermal Performance: The SB2540DC supports an extended operating temperature range (-55°C ~ 200°C) compared to the original part (-55°C ~ 125°C), providing additional thermal margin for demanding applications.

The SB2540DC is suitable for direct substitution in applications where the CDBD2020-HF was previously specified, with no circuit redesign required.

Frequently Asked Questions (FAQ)

Q: Can the SB2540DC be used as a direct replacement for CDBD2020-HF without PCB modifications?

A: Yes. Both devices share identical TO-263-3 (D2PAK) packaging with 2 leads plus tab. PCB footprints are compatible, and no layout modifications are required. Pin configuration and thermal interface characteristics are identical.

Q: What are the key differences between CDBD2020-HF and SB2540DC?

A: The SB2540DC provides higher voltage rating (40 V vs. 20 V), higher current rating (25 A vs. 20 A), and extended temperature range (-55°C ~ 200°C vs. -55°C ~ 125°C). Forward voltage drop remains equivalent at 550 mV. The SB2540DC is in active production, while the CDBD2020-HF is obsolete.

Q: Will the higher voltage and current ratings of SB2540DC affect circuit performance?

A: No. Higher ratings provide design margin and do not degrade performance in applications designed for the original 20 V, 20 A specification. The device will operate within the same electrical parameters as the original part.

Q: Is the SB2540DC compliant with current regulatory standards?

A: Yes. The SB2540DC is ROHS3 compliant and REACH affected, meeting current environmental and regulatory requirements for electronic components.

Q: Are there any thermal considerations when substituting to SB2540DC?

A: The SB2540DC supports a higher maximum junction temperature (200°C vs. 125°C). This provides additional thermal margin but does not require changes to thermal management design. Existing heat sinking and thermal interface materials remain suitable.

Q: What is the packaging format for the SB2540DC?

A: The SB2540DC is supplied in Tape & Reel (TR) format, standard for surface mount production assembly. This is compatible with automated pick-and-place equipment used for CDBD2020-HF assembly.

Q: Can multiple CDBD2020-HF devices be replaced with a single SB2540DC?

A: No. Each device is a single diode array with 1 pair common cathode configuration. Substitution is one-to-one only. Circuit topology and current distribution requirements must be maintained.