CDBA140L-G Schottky Diode 40V 1A Equivalent & Substitute Parts

Part Overview

The CDBA140L-G is a Schottky rectifier diode manufactured by Comchip Technology, rated for 40V reverse voltage and 1A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Identifying equivalent and substitute parts is necessary for ongoing production support, legacy system maintenance, and design flexibility when the primary part becomes unavailable.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) Maximum @ If	400 mV @ 1 A	mV
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	1 mA @ 40 V	mA
Technology	Schottky	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-20°C to 80°C	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CDBA140L-G is determined by strict electrical and mechanical parameter matching within the Schottky diode category. The following criteria establish substitutability:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) Maximum: 40V (exact match required)
Current - Average Rectified (Io): 1A (exact match required)
Technology: Schottky (exact match required)
Mounting Type: Surface Mount (exact match required)
Package / Case: DO-214AC or SMA equivalent (exact match required)
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io) (exact match required)

Secondary Tolerance Parameters:

Voltage - Forward (Vf) Maximum @ If: 400–600 mV @ 1A (acceptable range for circuit operation)
Current - Reverse Leakage @ Vr: 100 µA to 1 mA @ 40V (acceptable range)
Operating Temperature - Junction: Minimum -20°C, Maximum 80°C or higher (equal or superior range acceptable)

All substitute parts listed below meet or exceed these criteria and maintain full electrical and mechanical compatibility with the CDBA140L-G in standard rectification applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ 1A (mV)	Reverse Leakage @ 40V	Tj Range (°C)	Package	Product Status
CDBA140L-G	Comchip Technology	40	1	400	1 mA	-20 to 80	DO-214AC (SMA)	Not For New Designs
CDBA140L-HF	Comchip Technology	40	1	400	1 mA	-50 to 100	DO-214AC (SMA)	Active
B140-13-F	Diodes Incorporated	40	1	500	500 µA	-65 to 150	DO-214AC (SMA)	Active
B140-E3/5AT	Vishay General Semiconductor - Diodes Division	40	1	520	200 µA	-65 to 125	DO-214AC (SMA)	Active
B140-E3/61T	Vishay General Semiconductor - Diodes Division	40	1	520	200 µA	-65 to 125	DO-214AC (SMA)	Active
MBRA140T3G	onsemi	40	1	550	500 µA	-55 to 125	DO-214AC (SMA)	Active
RB160L-40TE25	Rohm Semiconductor	40	1	550	100 µA	Up to 150	DO-214AC (SMA)	Not For New Designs
RB162L-40TE25	Rohm Semiconductor	40	1	550	500 µA	Up to 150	DO-214AC (SMA)	Not For New Designs
SS14-E3/5AT	Vishay General Semiconductor - Diodes Division	40	1	500	200 µA	-65 to 125	DO-214AC (SMA)	Active
SS14-E3/61T	Vishay General Semiconductor - Diodes Division	40	1	500	200 µA	-65 to 125	DO-214AC (SMA)	Active
SS14E-TP	Micro Commercial Co	40	1	600	500 µA	-55 to 150	DO-214AC (SMA)	Obsolete

Engineering Selection Recommendations

Primary Recommendation: CDBA140L-HF

The CDBA140L-HF is the direct successor to the CDBA140L-G from the same manufacturer (Comchip Technology). It maintains identical electrical specifications (40V, 1A, 400 mV forward voltage) while offering an extended operating temperature range (-50°C to 100°C versus -20°C to 80°C). Product status is Active, ensuring long-term availability and supply chain stability. This part is the optimal choice for direct replacement in new production runs and legacy system support.

Secondary Recommendations for Active Status Parts:

Vishay B140-E3/5AT and B140-E3/61T offer superior reverse leakage characteristics (200 µA versus 1 mA) and extended temperature range (-65°C to 125°C). Forward voltage is slightly elevated at 520 mV. These parts are suitable for applications requiring lower leakage current and wider temperature operation. Packaging differs only in tape format (5AT = Tape & Reel; 61T = Cut Tape & Digi-Reel).

Vishay SS14-E3/5AT and SS14-E3/61T provide balanced performance with 500 mV forward voltage and 200 µA reverse leakage. Temperature range extends to -65°C to 125°C. These parts are functionally equivalent and widely available.

Diodes Incorporated B140-13-F offers the widest operating temperature range (-65°C to 150°C) and highest inventory availability (636,455 pcs). Forward voltage is 500 mV and reverse leakage is 500 µA. This part is suitable for extreme temperature applications.

onsemi MBRA140T3G maintains 40V/1A ratings with 550 mV forward voltage and 500 µA reverse leakage. Operating range is -55°C to 125°C. This part is suitable for standard industrial applications.

Parts to Avoid for New Designs:

RB160L-40TE25, RB162L-40TE25, and SS14E-TP are classified as "Not For New Designs" or "Obsolete" and should not be selected for new production. These parts may be used only for legacy system maintenance where original part specifications are mandatory.

All recommended substitute parts are ROHS3 Compliant, MSL 1 (Unlimited), and REACH Unaffected, matching the compliance profile of the CDBA140L-G.

Frequently Asked Questions (FAQ)

Q: Can I use any 40V 1A Schottky diode as a substitute for the CDBA140L-G?

A: No. Substitution requires exact matching of voltage rating (40V), current rating (1A), technology (Schottky), mounting type (Surface Mount), package (DO-214AC/SMA), and speed classification (Fast Recovery ≤ 500ns). Forward voltage and reverse leakage may vary within acceptable ranges, but all other parameters must match precisely.

Q: What is the difference between CDBA140L-G and CDBA140L-HF?

A: Both parts are manufactured by Comchip Technology and share identical electrical specifications (40V, 1A, 400 mV forward voltage). The primary difference is product status: CDBA140L-G is "Not For New Designs" while CDBA140L-HF is "Active." Additionally, CDBA140L-HF offers an extended operating temperature range (-50°C to 100°C versus -20°C to 80°C). For new designs and ongoing production, CDBA140L-HF is the recommended choice.

Q: Are the Vishay B140-E3/5AT and B140-E3/61T parts interchangeable?

A: Yes, electrically and mechanically. Both parts are identical except for packaging format: 5AT indicates Tape & Reel (TR) packaging, while 61T indicates Cut Tape (CT) & Digi-Reel® packaging. Selection depends on your assembly equipment and procurement requirements.

Q: What does "Fast Recovery ≤ 500ns, > 200mA (Io)" mean?

A: This specification indicates the diode's switching speed classification. The recovery time is 500 nanoseconds or less when the diode is switching from forward conduction to reverse blocking at currents greater than 200 mA. This fast recovery characteristic is essential for rectification applications and must be maintained in any substitute part.

Q: Can I use SS14E-TP as a substitute?

A: SS14E-TP is classified as "Obsolete" and should not be used for new designs or ongoing production. While it meets the electrical and mechanical requirements (40V, 1A, DO-214AC package), its obsolete status indicates discontinued manufacturing and uncertain future availability. Use only for legacy system maintenance where original specifications are mandatory.

Q: What is the significance of the forward voltage difference between CDBA140L-G (400 mV) and B140-13-F (500 mV)?

A: The 100 mV difference represents acceptable variation within the Schottky diode category. In most rectification circuits, this variation does not affect circuit performance. However, in precision applications with tight voltage budgets or high-current scenarios, the lower forward voltage of CDBA140L-G or CDBA140L-HF may be preferred. Verify circuit requirements before substitution.

Q: Why do some parts have higher reverse leakage current (500 µA) compared to CDBA140L-G (1 mA)?

A: Reverse leakage current varies among manufacturers and manufacturing processes. Lower leakage (100–200 µA) indicates superior semiconductor quality and is generally preferable. However, in most applications, leakage differences in this range do not affect circuit operation. For applications sensitive to leakage current (such as precision analog circuits), select parts with lower reverse leakage specifications.

Q: Is the operating temperature range important for my application?

A: Yes. The CDBA140L-G operates from -20°C to 80°C. If your application requires operation outside this range, select a substitute with an extended temperature range. For example, B140-13-F (-65°C to 150°C) or Vishay parts (-65°C to 125°C) provide wider operating margins. Verify your application's temperature requirements before selecting a substitute.

Q: Are all listed substitute parts RoHS3 Compliant?

A: Yes. All substitute parts listed in this document are ROHS3 Compliant and MSL 1 (Unlimited), matching the compliance profile of the CDBA140L-G. All parts are also REACH Unaffected. Compliance certifications are maintained across all substitutes.

Q: What packaging options are available for substitute parts?

A: All substitute parts use the DO-214AC (SMA) package or equivalent surface mount package. Packaging format options include Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel®. Selection depends on your assembly equipment and procurement workflow. Electrical and mechanical compatibility is maintained across all packaging formats.

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