CDBU42 Schottky Diode Equivalent & Substitute Parts

Part Overview

The CDBU42 is an active Schottky diode manufactured by Comchip Technology, designed for surface mount applications in the 0603/SOD-523F package. This component operates at 30V DC reverse voltage with 200mA average rectified current capability. The CDBU42 is ROHS3 compliant and maintains unlimited moisture sensitivity level (MSL 1), making it suitable for standard industrial and commercial electronic assemblies. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Substiute Parts

CDBU42

Comchip TechnologyIn Stock: 12434CDBU42 Datasheet

Current PartRFQ

CDBUR54

Comchip TechnologyIn Stock: 1038CDBUR54 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CDBU42 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 30 V
• Current - Average Rectified (Io): 200 mA
• Package / Case: 2-SMD, No Lead (0603/SOD-523F)
• Mounting Type: Surface Mount
• Technology: Schottky
• Operating Temperature - Junction (Max): 125°C

Allowable Variation Parameters:

• Voltage - Forward (Vf) (Max) @ If: Variation permitted within application-specific forward voltage tolerance
• Current - Reverse Leakage @ Vr: Variation permitted; lower leakage is acceptable
• Reverse Recovery Time (trr): Identical specification (5 ns)
• Capacitance @ Vr, F: Identical specification (10 pF @ 1V, 1MHz)

The CDBUR54 qualifies as a parametric equivalent based on matching all mandatory parameters. Differences in forward voltage specification and reverse leakage current do not disqualify substitution when application requirements permit such variation.

Parameter Comparison

Engineering Selection Recommendations

CDBU42 Primary Selection: The CDBU42 is the primary component choice when available. It maintains active product status with 12,400 pieces in stock. Full compliance with ROHS3 and REACH regulations is confirmed. MSL 1 rating permits unlimited shelf life without moisture bake requirements.

CDBUR54 Substitute Selection: The CDBUR54 qualifies as a direct substitute when CDBU42 availability is constrained. Both components share identical voltage ratings (30V), current ratings (200mA), package geometry (0603/SOD-523F), and thermal specifications (125°C junction temperature). Both maintain active product status with equivalent regulatory compliance (ROHS3, REACH Unaffected).

Specification Differences: The CDBUR54 specifies forward voltage at 100mA rather than 200mA, and exhibits higher reverse leakage current (2µA versus 500nA at 25V). These differences do not prevent substitution in applications where forward voltage drop and leakage current are within acceptable design margins. Circuit designers must confirm compatibility with specific application requirements before final component selection.

Compliance Considerations: Both components maintain identical environmental and regulatory certifications. No additional qualification is required when substituting between these parts from a compliance perspective.

Frequently Asked Questions (FAQ)

Q: Can CDBUR54 replace CDBU42 in all applications?

A: CDBUR54 qualifies as a parametric equivalent for applications where the forward voltage specification difference (measured at different current levels) and higher reverse leakage current (2µA versus 500nA) are within acceptable design tolerances. Circuit designers must evaluate specific application requirements for forward voltage drop and leakage current performance before confirming substitution.

Q: Are the packages identical between CDBU42 and CDBUR54?

A: Yes. Both components use the 0603/SOD-523F surface mount package with 2-SMD, No Lead configuration. PCB footprints and assembly processes are identical.

Q: What is the difference in forward voltage specification between these parts?

A: CDBU42 specifies maximum forward voltage of 1V at 200mA. CDBUR54 specifies maximum forward voltage of 1V at 100mA. The specification is measured at different current levels, which reflects different characterization conditions. Both parts operate within the same voltage range for typical applications.

Q: Do both parts have the same reverse leakage current?

A: No. CDBU42 specifies 500nA maximum reverse leakage at 25V. CDBUR54 specifies 2µA maximum reverse leakage at 25V. Applications sensitive to leakage current performance should account for this difference during design verification.

Q: Are regulatory certifications identical?

A: Yes. Both CDBU42 and CDBUR54 maintain ROHS3 compliance, REACH Unaffected status, and MSL 1 moisture sensitivity level. No additional regulatory qualification is required when substituting between these components.

Q: What is the reverse recovery time for both parts?

A: Both CDBU42 and CDBUR54 specify 5ns reverse recovery time, indicating identical switching speed performance.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes. Identical package geometry (0603/SOD-523F) and mounting type (Surface Mount) permit direct PCB substitution. Assembly equipment settings and reflow profiles require no modification.