CDBU40-HF Schottky Diode Equivalent & Substitute Parts

Part Overview

The CDBU40-HF is a surface mount Schottky diode manufactured by Comchip Technology, designed for rectification applications requiring low forward voltage drop and fast switching characteristics. This 40V, 200mA device is packaged in 0603/SOD-523F form factor and is classified as Active product status. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility within the Schottky diode category.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 40 mA	V
Reverse Recovery Time (trr)	5	ns
Current - Reverse Leakage @ Vr	200 nA @ 30 V	nA
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	pF
Package / Case	2-SMD, No Lead (0603/SOD-523F)	—
Operating Temperature - Junction (Max)	125	°C
Technology	Schottky	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the CDBU40-HF is determined by strict equivalence across the following critical parameters:

Reverse Voltage Rating: 40V maximum DC reverse voltage
Forward Current Rating: 200mA average rectified current
Forward Voltage Drop: 1V maximum at 40mA
Reverse Recovery Time: 5ns
Reverse Leakage Current: 200nA at 30V
Junction Capacitance: 5pF at 0V, 1MHz
Package Configuration: 2-SMD, No Lead in 0603/SOD-523F form factor
Mounting Technology: Surface Mount
Operating Temperature: 125°C maximum junction temperature

All identified substitute parts match these parameters exactly. Substitution is valid only when all electrical and mechanical specifications align with the values provided.

Parameter Comparison

Parameter	CDBU40-HF	CDBU40	CDBUR40
Manufacturer	Comchip Technology	Comchip Technology	Comchip Technology
Category	Diodes, Rectifiers	Diodes, Rectifiers	Diodes, Rectifiers
Technology	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V
Current - Average Rectified (Io)	200 mA	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 40 mA	1 V @ 40 mA	1 V @ 40 mA
Reverse Recovery Time (trr)	5 ns	5 ns	5 ns
Current - Reverse Leakage @ Vr	200 nA @ 30 V	200 nA @ 30 V	200 nA @ 30 V
Capacitance @ Vr, F	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz	5 pF @ 0V, 1MHz
Package / Case	2-SMD, No Lead	2-SMD, No Lead	2-SMD, No Lead
Supplier Device Package	0603/SOD-523F	0603/SOD-523F	0603/SOD-523F
Operating Temperature - Junction (Max)	125°C	125°C	125°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99	EAR99
HTSUS	8541.10.0070	8541.10.0070	8541.10.0070
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

All three parts—CDBU40-HF, CDBU40, and CDBUR40—are functionally equivalent for circuit applications requiring 40V, 200mA Schottky rectification. Selection among these parts may be based on inventory availability and supply chain considerations.

Compliance and Regulatory Status:

All parts are ROHS3 compliant
All parts are REACH unaffected
All parts carry EAR99 export classification
All parts are classified as HTSUS 8541.10.0070
All parts have MSL rating of 1 (Unlimited moisture sensitivity level)

Product Status: All three parts maintain Active product status, indicating ongoing manufacturer support and availability.

Inventory Considerations:

CDBU40-HF: 722 Pcs in stock
CDBU40: 3400 Pcs in stock
CDBUR40: 824 Pcs in stock

Frequently Asked Questions (FAQ)

Q: Can CDBU40 be used as a direct replacement for CDBU40-HF?

A: Yes. Both parts are manufactured by Comchip Technology and share identical electrical specifications across all critical parameters: 40V reverse voltage, 200mA forward current, 1V forward voltage drop at 40mA, 5ns reverse recovery time, and 200nA reverse leakage current. Both are packaged in 0603/SOD-523F surface mount form factor.

Q: What is the difference between CDBU40-HF and CDBUR40?

A: There is no functional difference. Both parts meet identical electrical and mechanical specifications. The part number suffix variation reflects manufacturer nomenclature but does not indicate performance differentiation.

Q: Are these parts interchangeable in PCB assembly?

A: Yes. All three parts use identical 2-SMD, No Lead packaging in 0603/SOD-523F configuration. They are mechanically and electrically interchangeable on printed circuit boards designed for this package type.

Q: Do all substitute parts have the same compliance certifications?

A: Yes. CDBU40-HF, CDBU40, and CDBUR40 all carry ROHS3 compliance, REACH unaffected status, and identical export classification (EAR99). All are rated MSL 1 (Unlimited).

Q: What determines whether a part can substitute for CDBU40-HF?

A: Substitution is valid only when a part matches all of the following: 40V maximum reverse voltage, 200mA average rectified current, 1V maximum forward voltage at 40mA, 5ns reverse recovery time, 200nA reverse leakage at 30V, 5pF capacitance at 0V/1MHz, 0603/SOD-523F package, surface mount mounting type, and 125°C maximum junction temperature.

Q: Can parts with different voltage or current ratings substitute for CDBU40-HF?

A: No. Substitution requires exact matching of voltage and current specifications. Parts with different Vr or Io ratings are not equivalent and cannot be used interchangeably.

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