CDBQC43-HF Equivalent & Substitute Parts

Part Overview

The CDBQC43-HF is a Schottky diode manufactured by Comchip Technology, rated for 30V DC reverse voltage with 200mA average rectified current. This surface mount component in 0402 (1006 Metric) package is designed for small signal applications requiring fast switching characteristics. The part is currently active in production with 902 pieces in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or specific application requirements such as automotive qualification or enhanced reliability certifications.

Substiute Parts

CDBQC43-HF

Comchip TechnologyIn Stock: 950CDBQC43-HF Datasheet

Current PartRFQ

ACDBQC54-HF

Comchip TechnologyIn Stock: 5848ACDBQC54-HF Datasheet

Parametric EquivalentRFQ

BAT54LP-7B

Diodes IncorporatedIn Stock: 143440BAT54LP-7B Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDBQC43-HF is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

• Voltage - DC Reverse (Vr) (Max): 30V
• Current - Average Rectified (Io): 200mA
• Package / Case: 0402 (1006 Metric)
• Mounting Type: Surface Mount
• Technology: Schottky
• Operating Temperature Range: -65°C to 125°C
• Reverse Recovery Time (trr): 5 ns
• Capacitance @ Vr, F: 10 pF @ 1V, 1MHz

Allowable Parameter Variations:

• Voltage - Forward (Vf) (Max) @ If: Measured at different current levels (100mA or 200mA) while maintaining maximum 1V specification
• Current - Reverse Leakage @ Vr: Variations permitted within acceptable leakage specifications
• Packaging Format: Tape & Reel (TR) acceptable as alternative to standard packaging
• Supplier Device Package: Alternative package designations acceptable if mechanical and electrical compatibility confirmed

The identified substitute parts ACDBQC54-HF and BAT54LP-7B meet all mandatory equivalence criteria and are therefore direct functional replacements for the CDBQC43-HF in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

ACDBQC54-HF (Comchip Technology): This substitute maintains identical electrical specifications to the CDBQC43-HF with the addition of automotive-grade qualification (AEC-Q101) and RoHS3 compliance. The part is supplied in Tape & Reel format with significantly higher inventory availability (5759 pieces). The forward voltage specification is measured at 100mA rather than 200mA, which remains within the 1V maximum threshold. This part is suitable for applications requiring automotive-grade reliability without compromising electrical performance.

BAT54LP-7B (Diodes Incorporated): This substitute meets all mandatory electrical equivalence criteria with identical voltage, current, and switching characteristics. The part carries automotive-grade qualification (AEC-Q101), RoHS3 compliance, and REACH unaffected status. Reverse leakage current is specified at 2µA compared to 500nA in the main part, representing a higher but acceptable leakage specification. The supplier device package designation (X1-DFN1006-2) differs from the main part while maintaining mechanical compatibility within the 0402 (1006 Metric) footprint. Inventory availability is substantially higher (143343 pieces). This part is suitable for applications where higher leakage tolerance is acceptable and maximum supply availability is required.

Selection Basis: Both substitute parts are active products with current production status. Selection between ACDBQC43-HF and BAT54LP-7B depends on leakage current tolerance requirements and supply chain preferences. The ACDBQC54-HF maintains tighter leakage specifications matching the original part. The BAT54LP-7B provides maximum inventory availability with acceptable leakage performance for general applications.

Frequently Asked Questions (FAQ)

Q: Can ACDBQC54-HF be used as a direct replacement for CDBQC43-HF?

A: Yes. The ACDBQC54-HF is a direct functional equivalent meeting all mandatory electrical parameters: 30V reverse voltage, 200mA average rectified current, 5ns reverse recovery time, and identical capacitance specifications. Both parts use the 0402 (1006 Metric) surface mount package with compatible footprints. The primary difference is packaging format (Tape & Reel) and automotive qualification certification.

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

A: The CDBQC43-HF and ACDBQC54-HF specify 500nA reverse leakage at 25V. The BAT54LP-7B specifies 2µA reverse leakage at 25V. This represents a 4x increase in leakage current for the BAT54LP-7B. Applications sensitive to leakage current should use CDBQC43-HF or ACDBQC54-HF. Applications with higher leakage tolerance can use BAT54LP-7B.

Q: Are there package compatibility concerns between these parts?

A: All three parts use the 0402 (1006 Metric) package footprint and are surface mount components. The CDBQC43-HF and ACDBQC54-HF use the 0402C/SOD-923F supplier package designation. The BAT54LP-7B uses the X1-DFN1006-2 supplier package designation. Despite different designations, all parts are mechanically compatible with standard 0402 PCB footprints.

Q: Which substitute part should be selected for automotive applications?

A: Both ACDBQC54-HF and BAT54LP-7B carry AEC-Q101 automotive qualification. The CDBQC43-HF does not specify automotive qualification. For automotive applications, either ACDBQC54-HF or BAT54LP-7B is appropriate. Selection between these two depends on leakage current requirements and supply availability.

Q: What is the impact of forward voltage measurement at different current levels?

A: The CDBQC43-HF specifies forward voltage at 200mA (1V max). The ACDBQC54-HF and BAT54LP-7B specify forward voltage at 100mA (1V max). Forward voltage increases with current, so measurement at lower current (100mA) typically yields lower voltage values. All three parts maintain the 1V maximum specification, ensuring functional compatibility in circuit applications.

Q: Are there RoHS compliance differences between these parts?

A: The CDBQC43-HF does not specify RoHS status in the provided data. The ACDBQC54-HF and BAT54LP-7B are both RoHS3 compliant. For applications requiring RoHS compliance, ACDBQC54-HF or BAT54LP-7B must be selected.

Q: What inventory considerations apply to these substitutes?

A: The CDBQC43-HF has 902 pieces in stock. The ACDBQC54-HF has 5759 pieces available. The BAT54LP-7B has 143343 pieces in stock. For applications requiring maximum supply availability and lead time reduction, BAT54LP-7B offers the highest inventory level.