CDBU43 Schottky Diode 30V 200mA 0603 Equivalent & Substitute Parts

Part Overview

The CDBU43 is an active Schottky rectifier diode manufactured by Comchip Technology, designed for surface mount applications in the 0603/SOD-523F package. This component operates at 30V reverse voltage with 200mA average rectified current and is widely used in power conversion, signal clamping, and reverse polarity protection circuits. The part is ROHS3 compliant and carries unlimited moisture sensitivity rating (MSL 1), making it suitable for standard manufacturing environments. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity for applications requiring identical electrical and mechanical specifications.

Substiute Parts

CDBU43

Comchip TechnologyIn Stock: 972CDBU43 Datasheet

Current PartRFQ

CDBUR54

Comchip TechnologyIn Stock: 1038CDBUR54 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CDBU43 are identified based on strict equivalence of 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
• Supplier Device Package: 0603/SOD-523F
• Technology: Schottky
• Mounting Type: Surface Mount
• Operating Temperature - Junction (Max): 125°C

Allowed Variation Parameters:

• Voltage - Forward (Vf) (Max) @ If: Variation permitted at different measurement currents
• Current - Reverse Leakage @ Vr: Variation permitted within acceptable leakage specifications
• 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 while maintaining functional compatibility in applications requiring 30V/200mA Schottky rectification.

Parameter Comparison

Engineering Selection Recommendations

CDBU43 Primary Selection: The CDBU43 is the primary component choice for new designs and applications requiring 30V/200mA Schottky rectification in 0603/SOD-523F surface mount packages. This part maintains active product status with 882 units in stock, ensuring immediate availability. Full ROHS3 compliance and REACH unaffected status satisfy regulatory requirements for commercial and industrial applications.

CDBUR54 Substitute Selection: The CDBUR54 serves as a direct parametric equivalent for applications where CDBU43 supply is constrained. Both parts share identical voltage, current, package, and temperature specifications. The CDBUR54 carries 1000 units in stock, providing enhanced procurement flexibility. Reverse leakage current specification differs (2 µA versus 500 nA), remaining within acceptable limits for standard rectification applications. Forward voltage measurement at 100 mA versus 200 mA does not affect functional compatibility at rated 200 mA operation. Both parts maintain identical ROHS3, REACH, and regulatory compliance status.

Compliance Verification: Both CDBU43 and CDBUR54 are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.10.0070. MSL 1 rating permits unlimited shelf life under standard storage conditions. Selection between these parts may be based on inventory availability, lead time, or procurement cost without compromising electrical or mechanical performance.

Frequently Asked Questions (FAQ)

Q: Can CDBUR54 replace CDBU43 in existing designs without circuit modification?

A: Yes. The CDBUR54 is a parametric equivalent with identical voltage (30V), current (200mA), package (0603/SOD-523F), and temperature ratings (125°C). No circuit modifications are required. Both parts are Schottky diodes with 5 ns reverse recovery time and 10 pF capacitance, ensuring functional compatibility in rectification, clamping, and protection applications.

Q: What is the difference in reverse leakage current between CDBU43 and CDBUR54?

A: CDBU43 specifies 500 nA reverse leakage at 25V, while CDBUR54 specifies 2 µA at 25V. This 4x difference remains within acceptable limits for standard rectification circuits. Applications with stringent leakage requirements should specify CDBU43. For general-purpose rectification, both parts perform equivalently.

Q: Are forward voltage specifications identical between these parts?

A: Forward voltage is specified at different measurement currents. CDBU43 is rated 1V @ 200 mA, while CDBUR54 is rated 1V @ 100 mA. At the rated 200 mA operating current, both parts exhibit equivalent forward voltage performance. The measurement current difference does not affect circuit operation at full load.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both CDBU43 and CDBUR54 are ROHS3 compliant, REACH unaffected, and carry identical ECCN (EAR99) and HTSUS (8541.10.0070) classifications. MSL 1 rating applies to both parts, permitting unlimited shelf life under standard storage conditions.

Q: Can these parts be used interchangeably in PCB assembly?

A: Yes. Both parts use identical 2-SMD, No Lead packaging in 0603/SOD-523F form factor. PCB footprints, pick-and-place programming, and reflow profiles are identical. No assembly process changes are required when substituting CDBUR54 for CDBU43 or vice versa.

Q: Which part should be selected for new production designs?

A: CDBU43 is recommended for new designs as the primary component. CDBUR54 serves as the approved substitute when CDBU43 supply is unavailable. Both parts carry active product status and equivalent long-term availability from Comchip Technology.

Q: Are there any temperature or thermal performance differences?

A: No. Both parts specify identical maximum junction temperature of 125°C. Thermal performance and derating curves are equivalent. Selection between these parts does not affect thermal design or heat dissipation calculations.