CDBUR43 Equivalent & Substitute Parts

Part Overview

The CDBUR43 is a Schottky diode manufactured by Comchip Technology, rated for 30V DC reverse voltage with 200mA average rectified current in a surface mount 0603/SOD-523F package. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain discontinuity, or design flexibility needs.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	30	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 200 mA	V
Reverse Recovery Time (trr)	5	ns
Current - Reverse Leakage @ Vr	500 nA @ 25 V	nA
Capacitance @ Vr, F	10 pF @ 1V, 1MHz	pF
Package / Case	2-SMD, No Lead (0603/SOD-523F)	—
Operating Temperature - Junction (Max)	125	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution eligibility for the CDBUR43 is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 30 V
Current - Average Rectified (Io): 200 mA
Package / Case: 2-SMD, No Lead (0603/SOD-523F)
Technology: Schottky
Reverse Recovery Time (trr): 5 ns
Operating Temperature - Junction (Max): 125°C
RoHS3 Compliance and MSL 1 rating

Allowable Parameter Variation: Substitute parts may exhibit differences in forward voltage (Vf) and reverse leakage current (Ir) within the specified operating conditions, provided all other parameters remain equivalent. These variations do not affect functional interchangeability in standard rectification applications.

Parameter Comparison

Parameter	CDBUR43	CDBUR54	Compatibility
Manufacturer	Comchip Technology	Comchip Technology	Same
Category	Diodes, Rectifiers	Diodes, Rectifiers	Same
Technology	Schottky	Schottky	Same
Voltage - DC Reverse (Vr) (Max)	30 V	30 V	Equivalent
Current - Average Rectified (Io)	200 mA	200 mA	Equivalent
Voltage - Forward (Vf) (Max) @ If	1 V @ 200 mA	1 V @ 100 mA	Variation Noted
Reverse Recovery Time (trr)	5 ns	5 ns	Equivalent
Current - Reverse Leakage @ Vr	500 nA @ 25 V	2 µA @ 25 V	Variation Noted
Capacitance @ Vr, F	10 pF @ 1V, 1MHz	10 pF @ 1V, 1MHz	Equivalent
Package / Case	2-SMD, No Lead (0603/SOD-523F)	2-SMD, No Lead (0603/SOD-523F)	Equivalent
Operating Temperature - Junction (Max)	125°C	125°C	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent
Product Status	Active	Active	Equivalent

Engineering Selection Recommendations

CDBUR54 as Substitute for CDBUR43:

The CDBUR54 is a direct functional substitute for the CDBUR43 based on equivalence in voltage rating, current capacity, package form factor, and thermal specifications. Both components maintain Active product status with identical RoHS3 compliance and MSL 1 moisture sensitivity classification.

The CDBUR54 exhibits higher reverse leakage current (2 µA versus 500 nA at 25V) and forward voltage specification at a lower test current (100 mA versus 200 mA). These parameter variations remain within acceptable tolerances for standard rectification circuit applications and do not compromise functional interchangeability in designs operating within the specified 30V/200mA envelope.

Both parts are supplied in identical 0603/SOD-523F surface mount packaging, ensuring mechanical and thermal compatibility in PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can CDBUR54 replace CDBUR43 in all applications?

A: CDBUR54 is functionally equivalent to CDBUR43 for rectification applications within the specified 30V/200mA operating range. Both components share identical voltage ratings, current capacity, package geometry, and thermal specifications. The higher reverse leakage current of CDBUR54 does not affect performance in standard rectifier circuits.

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

A: CDBUR43 specifies forward voltage at 200 mA (1 V max), while CDBUR54 specifies forward voltage at 100 mA (1 V max). This difference reflects measurement conditions rather than functional capability. Both parts operate within the same voltage envelope for rectification purposes.

Q: Are the packages identical?

A: Yes. Both CDBUR43 and CDBUR54 use the 0603/SOD-523F surface mount package with 2-SMD, No Lead configuration. PCB footprints and assembly processes are identical.

Q: Do both parts meet the same compliance standards?

A: Yes. Both CDBUR43 and CDBUR54 are RoHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity rating. Compliance certifications are equivalent.

Q: What determines substitution eligibility?

A: Substitution is based on equivalence in reverse voltage rating (30V), average rectified current (200mA), package type (0603/SOD-523F), technology (Schottky), reverse recovery time (5 ns), and maximum junction temperature (125°C). Variations in forward voltage and reverse leakage current are allowable within standard rectification applications.

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