CDBU43-HF Schottky Diode Equivalent & Substitute Parts

Part Overview

The CDBU43-HF is a surface mount Schottky diode manufactured by Comchip Technology, rated for 30V DC reverse voltage with 200mA average rectified current. This component is classified as a small signal rectifier diode in the 0603/SOD-523F package format. The part maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when component availability is constrained, supply chain disruptions occur, or inventory requirements necessitate alternative sourcing from the same manufacturer while maintaining electrical and mechanical compatibility.

Substiute Parts

CDBU43-HF

Comchip TechnologyIn Stock: 1106CDBU43-HF Datasheet

Current PartRFQ

CDBUR54

Comchip TechnologyIn Stock: 1038CDBUR54 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CDBU43-HF is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) Maximum: 30V
• Current - Average Rectified (Io): 200mA
• Package / Case: 2-SMD, No Lead
• Supplier Device Package: 0603/SOD-523F
• Technology: Schottky
• Reverse Recovery Time (trr): 5ns
• Operating Temperature - Junction Maximum: 125°C
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Allowable Parameter Variations: Substitute parts may exhibit differences in forward voltage (Vf) specification points and reverse leakage current (Ir) values, provided these variations do not exceed the maximum ratings of the application circuit and remain within the Schottky diode technology classification for small signal rectification (≤200mA).

The CDBUR54 qualifies as a parametric equivalent based on matching all mandatory parameters while operating within acceptable tolerance ranges for forward voltage measurement conditions and reverse leakage characteristics.

Parameter Comparison

Engineering Selection Recommendations

CDBU43-HF Primary Selection: The CDBU43-HF is the primary component specification. Current inventory status shows 1085 pieces in stock. This part maintains Active product status with full regulatory compliance (RoHS3, REACH Unaffected). The forward voltage specification is defined at 200mA, matching the maximum rated current capacity.

CDBUR54 Substitute Selection: The CDBUR54 qualifies as a direct parametric equivalent for applications where CDBU43-HF availability is limited. Inventory availability is 1000 pieces. Both parts share identical voltage ratings, current capacity, package format, and thermal specifications. The CDBUR54 maintains equivalent Active product status and regulatory compliance certifications.

Compliance Basis: Both parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, suitable for standard surface mount assembly processes without special handling requirements. Both parts carry REACH Unaffected status and EAR99 export classification.

Substitution Validity: The CDBUR54 operates within the same electrical performance envelope as the CDBU43-HF for small signal Schottky rectification applications. The forward voltage specification point difference (100mA vs. 200mA) and reverse leakage variation (500nA vs. 2µA) remain within acceptable tolerances for typical rectifier circuit applications operating at or below 200mA average rectified current.

Frequently Asked Questions (FAQ)

Q: Can CDBUR54 be used as a direct replacement for CDBU43-HF in all applications?

A: The CDBUR54 is electrically and mechanically compatible with CDBU43-HF for applications requiring 30V reverse voltage rating and 200mA average rectified current in 0603/SOD-523F package format. Both parts are Schottky technology with identical reverse recovery time (5ns) and junction temperature rating (125°C maximum).

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

A: The CDBU43-HF specifies forward voltage at 200mA (1V maximum), while the CDBUR54 specifies forward voltage at 100mA (1V maximum). Both parts maintain the same maximum forward voltage value. The measurement point difference reflects different characterization conditions but does not affect substitution validity for circuits operating within the 200mA maximum current rating.

Q: Are there differences in reverse leakage current?

A: The CDBU43-HF specifies 500nA reverse leakage at 25V, while the CDBUR54 specifies 2µA reverse leakage at 25V. Both measurements are taken at 25V. The CDBUR54 exhibits higher reverse leakage but remains within acceptable limits for small signal rectifier applications. Circuit designs should account for this variation if leakage current is a critical parameter.

Q: Are both parts suitable for automated surface mount assembly?

A: Both CDBU43-HF and CDBUR54 are supplied in Tape & Reel (TR) packaging format with 0603/SOD-523F package specification, suitable for standard automated surface mount assembly equipment. Both parts carry MSL 1 (Unlimited) rating, requiring no special moisture control or baking procedures prior to assembly.

Q: What regulatory certifications apply to both parts?

A: Both parts are RoHS3 compliant and REACH Unaffected. Both carry EAR99 export classification and HTSUS code 8541.10.0070. Both parts maintain Active product status with no planned obsolescence.

Q: Can these parts be intermixed in the same production lot?

A: The CDBU43-HF and CDBUR54 are parametric equivalents from the same manufacturer (Comchip Technology) with identical package format and electrical ratings. Intermixing is permissible in applications where forward voltage and reverse leakage variations fall within circuit tolerance specifications. Design documentation should specify acceptable parameter ranges if intermixing occurs.