CDBB340-G Schottky Diode 40V 3A DO-214AA Equivalent & Substitute Parts

Part Overview

The CDBB340-G is a Schottky rectifier diode manufactured by Comchip Technology, rated for 40V reverse voltage and 3A average rectified current in a DO-214AA (SMB) surface mount package. This part is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent and substitute parts is necessary for ongoing production support, legacy system maintenance, and design continuity where this component specification remains applicable.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500 µA @ 40 V	µA
Technology	Schottky	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CDBB340-G is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 40V minimum
Current - Average Rectified (Io): 3A minimum
Technology: Schottky
Package / Case: DO-214AA or SMB equivalent
Mounting Type: Surface Mount
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Forward voltage (Vf) at rated current
Reverse leakage current (Ir) at rated voltage
Operating temperature range
RoHS and regulatory compliance

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (40V, 3A): Parts meeting or exceeding all primary electrical specifications with identical current rating.

Category B - Functional Alternatives (40V, Lower Current Rating): Parts with reduced current ratings (1A) that may serve in applications with lower current demands but require design verification.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Ir @ Vr	Package	Status	Temp Range
CDBB340-G	Comchip Technology	40V	3A	500 mV @ 3A	500 µA @ 40V	DO-214AA	Not For New Designs	—
CDBB340-HF	Comchip Technology	40V	3A	500 mV @ 3A	500 µA @ 40V	DO-214AA	Active	-40°C ~ 70°C
B340B-13-F	Diodes Incorporated	40V	3A	500 mV @ 3A	500 µA @ 40V	DO-214AA	Active	-55°C ~ 150°C
B340LB-13-F	Diodes Incorporated	40V	3A	450 mV @ 3A	2 mA @ 40V	DO-214AA	Active	-55°C ~ 125°C
B340LB-E3/52T	Vishay General Semiconductor	40V	3A	450 mV @ 3A	400 µA @ 40V	DO-214AA	Active	-65°C ~ 150°C
B340LB-E3/5BT	Vishay General Semiconductor	40V	3A	450 mV @ 3A	400 µA @ 40V	DO-214AA	Active	-65°C ~ 150°C
SK34B-LTP	Micro Commercial Co	40V	3A	500 mV @ 3A	500 µA @ 40V	DO-214AA	Active	-55°C ~ 150°C
SK34B-TP	Micro Commercial Co	40V	3A	500 mV @ 3A	500 µA @ 40V	DO-214AA	Obsolete	-55°C ~ 125°C
STPS140U	STMicroelectronics	40V	1A	550 mV @ 1A	12 µA @ 40V	DO-214AA	Active	—
STPS140UY	STMicroelectronics	40V	1A	650 mV @ 2A	12 µA @ 40V	DO-214AA	Active	-40°C ~ 150°C
STPS1L40U	STMicroelectronics	40V	1A	500 mV @ 1A	35 µA @ 40V	DO-214AA	Active	—

Engineering Selection Recommendations

For Direct Replacement (40V, 3A Rating):

The following parts provide full electrical and mechanical compatibility with the CDBB340-G:

CDBB340-HF (Comchip Technology): Active status equivalent from the same manufacturer. Identical electrical specifications. Suitable for immediate substitution in production environments requiring continuity with existing supply chains.
B340B-13-F (Diodes Incorporated): Active status, AEC-Q101 automotive qualified. Extended operating temperature range (-55°C ~ 150°C). ROHS3 compliant. Recommended for applications requiring automotive-grade reliability and wider temperature operation.
B340LB-13-F (Diodes Incorporated): Active status. Improved forward voltage (450 mV vs. 500 mV) reduces power dissipation. Extended temperature range (-55°C ~ 125°C). ROHS3 compliant. Suitable for thermal-sensitive applications.
B340LB-E3/52T (Vishay General Semiconductor): Active status. Improved forward voltage (450 mV). Extended temperature range (-65°C ~ 150°C). ROHS3 compliant. Recommended for extreme temperature environments.
B340LB-E3/5BT (Vishay General Semiconductor): Active status, tape and reel packaging. Identical specifications to B340LB-E3/52T. Suitable for high-volume automated assembly.
SK34B-LTP (Micro Commercial Co): Active status. Identical electrical specifications to CDBB340-G. Extended temperature range (-55°C ~ 150°C). Highest inventory availability (146,400 pcs). ROHS3 compliant. Recommended for cost-optimized procurement with extended supply assurance.

For Reduced Current Applications (40V, 1A Rating):

The following parts are suitable only for applications where circuit current requirements do not exceed 1A:

STPS140U (STMicroelectronics): Active status. 40V, 1A rating. DO-214AA package. ROHS3 compliant. Requires design verification for current derating.
STPS140UY (STMicroelectronics): Active status, automotive grade. 40V, 1A rating. Extended temperature range (-40°C ~ 150°C). ROHS3 compliant. Suitable for automotive applications with reduced current requirements.
STPS1L40U (STMicroelectronics): Active status. 40V, 1A rating. DO-214AA package. ROHS3 compliant. Requires design verification for current derating.

Parts Not Recommended:

SK34B-TP (Micro Commercial Co): Obsolete status. Avoid for new procurement despite technical compatibility.

Frequently Asked Questions (FAQ)

Q1: Can I use a 1A rated diode (STPS140U, STPS140UY, STPS1L40U) as a direct replacement for the CDBB340-G in a 3A circuit?

A: No. These parts are rated for maximum 1A average rectified current. Using them in a 3A circuit exceeds their electrical rating and will result in device failure, thermal runaway, or fire hazard. They are suitable only for applications where actual circuit current does not exceed 1A. Design verification is required before substitution.

Q2: What is the difference between CDBB340-HF and CDBB340-G?

A: Both parts are manufactured by Comchip Technology with identical electrical specifications (40V, 3A, 500 mV forward voltage). The primary difference is product status: CDBB340-G is "Not For New Designs" (end-of-life), while CDBB340-HF is "Active" (current production). CDBB340-HF is the direct manufacturer replacement.

Q3: Why do some substitute parts have lower forward voltage (450 mV vs. 500 mV)?

A: Lower forward voltage indicates improved diode characteristics and reduced power dissipation during operation. Parts such as B340LB-13-F and B340LB-E3/52T with 450 mV forward voltage are superior in thermal performance. This is a beneficial characteristic for heat-sensitive applications.

Q4: What does "AEC-Q101" qualification mean?

A: AEC-Q101 is an automotive industry standard qualification for discrete semiconductors. Parts meeting this standard (such as B340B-13-F) have undergone rigorous reliability testing and are approved for automotive applications. This qualification is not required for general industrial use but indicates higher reliability standards.

Q5: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this document are ROHS3 compliant, matching the compliance status of the CDBB340-G. All parts are also REACH unaffected and classified as EAR99 for export control purposes.

Q6: Can I mix different manufacturers' parts in the same circuit board?

A: Yes. All listed substitute parts meet identical electrical specifications for voltage, current, and package. They are mechanically and electrically interchangeable. However, for production consistency and supply chain management, it is recommended to standardize on a single manufacturer per design revision.

Q7: What is the difference between DO-214AA and SMB package designations?

A: DO-214AA and SMB refer to the same physical package. DO-214AA is the JEDEC standard designation, while SMB is the industry common name. All parts in this document use these designations interchangeably and are physically identical.

Q8: Which substitute part has the best availability?

A: SK34B-LTP (Micro Commercial Co) has the highest inventory availability at 146,400 pieces in stock, followed by B340B-13-F (Diodes Incorporated) at 95,300 pieces. Both are active status parts suitable for immediate procurement.

Q9: Should I choose a part with extended temperature range (-65°C ~ 150°C) over standard range (-40°C ~ 70°C)?

A: Extended temperature range parts (such as B340LB-E3/52T) provide operational margin for extreme environmental conditions. If your application operates within standard industrial temperature ranges (-40°C to +70°C), standard range parts are sufficient. Extended range is beneficial for automotive, aerospace, or outdoor applications.

Q10: What is the significance of "Fast Recovery ≤ 500ns, > 200mA (Io)"?

A: This specification indicates the diode's switching speed. Fast recovery (≤ 500ns) means the diode transitions from conducting to blocking state within 500 nanoseconds. This characteristic is essential for high-frequency rectification and switching applications. All substitute parts meet this specification.

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