Equivalent & Substitute Parts for CD0603-B00340 (Bourns Inc.) – Diodes, Rectifiers

Part Overview

The CD0603-B00340, manufactured by Bourns Inc., is a surface-mount Schottky diode rated for 40 V reverse voltage and 30 mA average rectified current in a 0603 package (1608 Metric). As this model is now classified as obsolete, identifying substitute and equivalent Schottky diodes meeting the same key parameters is necessary for ongoing design support, repair, and manufacturing continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD0603-B00340
Category	Diodes, Rectifiers
Technology	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	30 mA
Voltage - Forward (Vf) (Max) @ If	370 mV @ 1 mA
Current - Reverse Leakage @ Vr	1 µA @ 40 V
Capacitance @ Vr, F	1.5 pF @ 1V, 1MHz
Mounting Type	Surface Mount
Package / Case	0603 (1608 Metric)
Operating Temperature - Junction	-40°C ~ 125°C
Compliance/Status	ROHS3 Compliant, REACH Unaffected, MSL 1, Obsolete

Substitute Part Grouping Explanation

Substitute components for the CD0603-B00340 are selected strictly on the basis of the following matching criteria within the Diodes, Rectifiers category:

Schottky technology
Maximum DC reverse voltage: 40 V
Current rating (equal to or exceeding 30 mA)
Maximum forward voltage
Maximum reverse leakage current at specified conditions
Matching or compatible package size (0603 or equivalent)
Surface mount configuration
Compliance with ROHS3, REACH, and MSL 1 requirements
Operating temperature range encompassing -40°C ~ 125°C

Parameter Comparison

Parameter	CD0603-B00340 (Bourns Inc.)	CD0603-B0240R (Bourns Inc.)	CDBU00340 (Comchip Technology)	SD0603S040S0R2 (KYOCERA AVX)
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V	40 V
Current - Average Rectified (Io)	30 mA	200 mA	30 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	370 mV @ 1 mA	550 mV @ 200 mA	370 mV @ 1 mA	450 mV @ 200 mA
Current - Reverse Leakage @ Vr	1 µA @ 40 V	1 µA @ 10 V	1 µA @ 40 V	1 µA @ 40 V
Capacitance @ Vr, F	1.5 pF @ 1V, 1MHz	35 pF @ 4V, 1MHz	1.5 pF @ 1V, 1MHz	-
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	0603 (1608 Metric)	0603 (1608 Metric)	2-SMD, No Lead	0603 (1608 Metric)
Supplier Device Package	0603	0603 (1608 Metric)	0603C/SOD-523F	0603 (1608 Metric)
Operating Temperature - Junction	-40°C ~ 125°C	-40°C ~ 125°C	125°C (Max)	-55°C ~ 125°C
RoHS / REACH / MSL	ROHS3, REACH, MSL 1	ROHS3, REACH, MSL 1	ROHS3, REACH, MSL 1	ROHS3, REACH, MSL 1
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

All substitute Schottky diodes listed are ROHS3 compliant, REACH unaffected, and rated MSL 1 (unlimited), matching the regulatory and qualification criteria of the original CD0603-B00340. As the main part is obsolete, selection should be based on matching electrical ratings, package compatibility, and compliance status as summarized.

Frequently Asked Questions (FAQ)

Q1: What are the key criteria for selecting a substitute for the CD0603-B00340?
A1: Substitutes must match technology (Schottky), maximum DC reverse voltage (40 V), current rating (equal or higher than 30 mA), compatible forward voltage and reverse leakage, surface mount configuration, package (0603 or equivalent), and compliance certifications (ROHS3, REACH, MSL 1).

Q2: Are all substitutes in the same package as CD0603-B00340?
A2: CD0603-B0240R and SD0603S040S0R2 are in 0603 (1608 Metric) packages. CDBU00340 is in a 0603C/SOD-523F package, which is also 2-SMD, No Lead and compatible in footprint.

Q3: Should differences in capacitance or forward voltage affect part selection?
A3: Only explicit values provided should be compared; selection depends on compliance with the minimum required ratings and package compatibility.

Q4: Are these substitute diodes compliant with international environmental and quality standards?
A4: All listed substitutes are ROHS3 compliant, REACH unaffected, and MSL 1 rated.

Q5: Can substitutes with higher current ratings be used in place of the original part?
A5: Substitutes with equal or higher current ratings are acceptable, provided all other parameters align as per the table above.

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