CDBV140-G Schottky Diode 40V 1A SOD-323 Equivalent & Substitute Parts

Part Overview

The CDBV140-G is a Schottky rectifier diode manufactured by Comchip Technology, rated for 40V DC reverse voltage and 1A average rectified current in a surface mount SOD-323 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The CDBV140-G features fast recovery characteristics with reverse recovery time ≤500ns at currents >200mA, suitable for high-frequency switching applications requiring low forward voltage drop.

Key Parameters

Parameter	Value	Condition
Voltage - DC Reverse (Vr) (Max)	40 V	—
Current - Average Rectified (Io)	1 A	—
Voltage - Forward (Vf) (Max)	600 mV	@ 1 A
Speed	Fast Recovery ≤500ns, >200mA (Io)	—
Current - Reverse Leakage	1 µA	@ 30 V
Capacitance	120 pF	@ 4V, 1MHz
Mounting Type	Surface Mount	—
Package / Case	SC-76, SOD-323	—
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CDBV140-G is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V (exact match required)
Package / Case: SC-76, SOD-323 (exact match required for mechanical and electrical compatibility)
Technology: Schottky (required for forward voltage and switching characteristics)
Mounting Type: Surface Mount (required for assembly compatibility)

Secondary Matching Criteria:

Current - Average Rectified (Io): 1 A (exact match for full-load applications; lower ratings acceptable for current-limited designs)
Voltage - Forward (Vf) (Max): 600 mV @ 1 A (baseline; lower values acceptable; higher values require circuit validation)
Speed: Fast Recovery ≤500ns, >200mA (Io) (baseline; small signal alternatives acceptable for lower current applications)
RoHS Status: ROHS3 Compliant (required for regulatory compliance)

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (1A rated, Fast Recovery): Parts matching all primary and secondary criteria with identical or superior electrical performance at rated current.

Category B - Functional Alternatives (Lower current or small signal): Parts with 40V rating and SOD-323 package but reduced current ratings or small signal characteristics, suitable for applications operating below 1A.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (Avg Rectified)	Vf (Max)	Speed	Package	Product Status	Inventory
CDBV140-G	Comchip Technology	40 V	1 A	600 mV @ 1 A	Fast Recovery ≤500ns, >200mA	SOD-323	Obsolete	9200 Pcs
CDBV140-HF	Comchip Technology	40 V	1 A	600 mV @ 1 A	Fast Recovery ≤500ns, >200mA	SOD-323	Active	1023 Pcs
B140WS-7	Diodes Incorporated	40 V	1 A	620 mV @ 1 A	Fast Recovery ≤500ns, >200mA	SOD-323	Active	35300 Pcs
B5819WS-TP	Micro Commercial Co	40 V	1 A	600 mV @ 1 A	Fast Recovery ≤500ns, >200mA	SOD-323	Active	305100 Pcs
B5819WS-TP-HF	Micro Commercial Co	40 V	1 A	600 mV @ 1 A	Fast Recovery ≤500ns, >200mA	SOD-323	Active	1146 Pcs
B0540WS-7	Diodes Incorporated	40 V	500 mA	550 mV @ 500 mA	Fast Recovery ≤500ns, >200mA	SOD-323	Active	149100 Pcs
BAT165E6327HTSA1	Infineon Technologies	40 V	750 mA	740 mV @ 750 mA	Fast Recovery ≤500ns, >200mA	SOD-323	Active	71870 Pcs
1PS76SB21,115	Nexperia USA Inc.	40 V	200 mA	550 mV @ 200 mA	Small Signal ≤200mA	SOD-323	Active	12300 Pcs
1PS76SB40,115	Nexperia USA Inc.	40 V	120 mA	1 V @ 40 mA	Small Signal ≤200mA	SOD-323	Active	6300 Pcs
1PS76SB40,135	Nexperia USA Inc.	40 V	120 mA	1 V @ 40 mA	Small Signal ≤200mA	SOD-323	Active	26772 Pcs
BAS140WE6327HTSA1	Infineon Technologies	40 V	120 mA	1 V @ 40 mA	Small Signal ≤200mA	SOD-323	Active	2360 Pcs

Engineering Selection Recommendations

Direct Replacement (Category A - 1A Rated, Fast Recovery):

For applications requiring full 1A current capacity with fast recovery characteristics, the following parts provide direct electrical and mechanical compatibility:

CDBV140-HF (Comchip Technology): Active product status, identical electrical specifications to CDBV140-G, ROHS3 compliant, MSL 1. Lower inventory availability (1023 Pcs).
B140WS-7 (Diodes Incorporated): Active product status, 40V/1A rating, fast recovery, ROHS3 compliant, MSL 1. Forward voltage 620 mV @ 1A (20 mV higher than CDBV140-G). Operating temperature range -40°C to 125°C. Inventory: 35300 Pcs.
B5819WS-TP (Micro Commercial Co): Active product status, 40V/1A rating, fast recovery, ROHS3 compliant, MSL 1. Identical forward voltage 600 mV @ 1A. Extended operating temperature range -65°C to 125°C. Highest inventory availability (305100 Pcs).
B5819WS-TP-HF (Micro Commercial Co): Active product status, 40V/1A rating, fast recovery. Lower reverse leakage (40 µA @ 40V) and reduced capacitance (48 pF @ 4V). Limited inventory (1146 Pcs).

Functional Alternatives (Category B - Lower Current Ratings):

For applications operating below 1A, the following parts provide 40V rating and SOD-323 package compatibility with reduced current specifications:

B0540WS-7 (Diodes Incorporated): 40V/500mA rating, fast recovery, ROHS3 compliant. Forward voltage 550 mV @ 500mA. Suitable for designs with maximum current ≤500mA. Inventory: 149100 Pcs.
BAT165E6327HTSA1 (Infineon Technologies): 40V/750mA rating, fast recovery, ROHS3 compliant. Forward voltage 740 mV @ 750mA. Suitable for designs with maximum current ≤750mA. Inventory: 71870 Pcs.
1PS76SB21,115 (Nexperia USA Inc.): 40V/200mA rating, small signal characteristics, ROHS3 compliant. Forward voltage 550 mV @ 200mA. Suitable for low-current applications ≤200mA. Inventory: 12300 Pcs.
1PS76SB40,115 / 1PS76SB40,135 (Nexperia USA Inc.): 40V/120mA rating, small signal characteristics, ROHS3 compliant. Forward voltage 1V @ 40mA. Suitable for low-current applications ≤120mA. Inventory: 6300 Pcs and 26772 Pcs respectively.
BAS140WE6327HTSA1 (Infineon Technologies): 40V/120mA rating, small signal characteristics, ROHS3 compliant. Forward voltage 1V @ 40mA. Reverse recovery time 100 ps. Suitable for low-current applications ≤120mA. Inventory: 2360 Pcs.

Selection Criteria:

Full 1A Capacity Required: Select from Category A (CDBV140-HF, B140WS-7, B5819WS-TP, B5819WS-TP-HF).
Reduced Current Operation: Select from Category B based on maximum circuit current.
Inventory Availability: B5819WS-TP offers highest stock (305100 Pcs) among 1A-rated alternatives.
Regulatory Compliance: All recommended parts are ROHS3 compliant and MSL 1 (except B5819WS-TP-HF, which is REACH Unaffected).
Temperature Range: B5819WS-TP and B5819WS-TP-HF support extended range (-65°C to 125°C) compared to standard -40°C to 125°C.

Frequently Asked Questions (FAQ)

Q1: Can I use a lower-current rated diode (e.g., B0540WS-7 at 500mA) as a substitute for CDBV140-G (1A)?

A: Only if your circuit design operates at or below the substitute part's current rating. The 40V reverse voltage rating is maintained, and the SOD-323 package is identical. However, using a 500mA-rated part in a 1A application will cause thermal stress and potential failure. Verify actual circuit current requirements before substitution.

Q2: What is the difference between fast recovery and small signal Schottky diodes in this list?

A: Fast recovery diodes (CDBV140-G, B140WS-7, B5819WS-TP, B0540WS-7, BAT165E6327HTSA1) are rated for currents >200mA with reverse recovery time ≤500ns, suitable for high-frequency switching. Small signal diodes (1PS76SB21, 1PS76SB40, BAS140WE6327HTSA1) are rated for currents ≤200mA with optimized low-capacitance characteristics, suitable for low-current signal applications. Do not substitute fast recovery with small signal in high-current applications.

Q3: Are all substitute parts pin-compatible with CDBV140-G?

A: Yes. All listed substitutes use the SOD-323 package (SC-76), which has identical pin configuration and footprint. No PCB layout changes are required for mechanical compatibility.

Q4: What does "ROHS3 Compliant" mean for component selection?

A: ROHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the part meets EU environmental regulations restricting lead, cadmium, mercury, and other hazardous substances. All recommended substitutes are ROHS3 compliant, ensuring regulatory compatibility with modern manufacturing and end-use requirements.

Q5: Why does B5819WS-TP-HF have lower capacitance (48 pF) compared to CDBV140-G (120 pF)?

A: Lower junction capacitance reduces parasitic effects in high-frequency circuits, improving switching speed and reducing noise. This is a design optimization in the B5819WS-TP-HF variant. If your circuit depends on specific capacitance values, verify compatibility before substitution.

Q6: Can I substitute CDBV140-G with 1PS76SB40 in a 1A application?

A: No. The 1PS76SB40 is rated for maximum 120mA average rectified current. Using it in a 1A application exceeds its current rating and will cause immediate thermal failure. This part is suitable only for applications with maximum current ≤120mA.

Q7: What is the significance of the operating temperature range difference between parts?

A: CDBV140-G has no specified operating temperature range. B5819WS-TP supports -65°C to 125°C, while B140WS-7 supports -40°C to 125°C. If your application operates below -40°C, B5819WS-TP is required. For standard industrial range (-40°C to 125°C), all active substitutes are acceptable.

Q8: Why is CDBV140-G marked as obsolete if substitutes are available?

A: Obsolete status indicates the manufacturer (Comchip Technology) has discontinued production. Existing inventory (9200 Pcs) may still be available through distributors, but long-term supply is not guaranteed. Active alternatives ensure design continuity and future procurement reliability.

Q9: Does forward voltage difference (600 mV vs. 620 mV) between CDBV140-G and B140WS-7 affect circuit performance?

A: The 20 mV difference is within typical tolerance for Schottky diodes and generally acceptable for most applications. However, in precision rectification or low-voltage circuits where forward voltage drop significantly affects efficiency, verify the impact through circuit simulation or testing.

Q10: What packaging options are available for these substitutes?

A: All substitutes are supplied in SOD-323 package. Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® are standard packaging formats for surface mount assembly. Verify your procurement and assembly process compatibility with the specific packaging format before ordering.

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