CDBA140LL-G Schottky Diode 40V 1A Equivalent & Substitute Parts

Part Overview

The CDBA140LL-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 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 This component is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line.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 design continuity, inventory management, and sourcing alternatives from active product lines.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	340	mV @ 1 A
Current - Reverse Leakage @ Vr	1	mA @ 40 V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-20 to 80	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the CDBA140LL-G is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Matching Parameters:

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

Allowable Variations:

Voltage - Forward (Vf) (Max) @ If: Substitute parts may exceed the 340 mV specification of the main part, provided the application circuit tolerates higher forward voltage drop
Current - Reverse Leakage @ Vr: Substitute parts may have higher leakage current than the 1 mA specification, provided the application circuit design accommodates increased reverse leakage
Operating Temperature - Junction: Substitute parts with wider or higher temperature ranges are acceptable for applications within the main part's operating window
Capacitance @ Vr, F: Variations are acceptable provided the application does not depend on specific capacitance characteristics

All substitute parts listed maintain the same 40V/1A electrical rating, Schottky technology, and surface mount SMA package form factor, ensuring mechanical and electrical compatibility in standard PCB assembly processes.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [mV]	Ir @ 40V [µA/mA]	Package	Tj (°C)	Product Status
CDBA140LL-G	Comchip Technology	40	1	340	1 mA	DO-214AC (SMA)	-20 to 80	Not For New Designs
CDBA140LL-HF	Comchip Technology	40	1	350	1 mA	DO-214AC (SMA)	-50 to 100	Active
B140-13-F	Diodes Incorporated	40	1	500	500 µA	DO-214AC (SMA)	-65 to 150	Active
B140-E3/5AT	Vishay General Semiconductor - Diodes Division	40	1	520	200 µA	DO-214AC (SMA)	-65 to 125	Active
MBRA140T3G	onsemi	40	1	550	500 µA	DO-214AC (SMA)	-55 to 125	Active
RB160L-40TE25	Rohm Semiconductor	40	1	550	100 µA	DO-214AC (SMA)	–55 to 150	Not For New Designs
RB162L-40TE25	Rohm Semiconductor	40	1	550	500 µA	DO-214AC (SMA)	–55 to 150	Not For New Designs
SS14-E3/5AT	Vishay General Semiconductor - Diodes Division	40	1	500	200 µA	DO-214AC (SMA)	-65 to 125	Active
SS14-E3/61T	Vishay General Semiconductor - Diodes Division	40	1	500	200 µA	DO-214AC (SMA)	-65 to 125	Active
SS14E-TP	Micro Commercial Co	40	1	600	500 µA	DO-214AC (SMA)	-55 to 150	Obsolete

Engineering Selection Recommendations

Primary Recommendation: CDBA140LL-HF

The CDBA140LL-HF is the direct successor from Comchip Technology with Active product status. It maintains the same 40V/1A electrical specification and DO-214AC package as the CDBA140LL-G. The forward voltage increase from 340 mV to 350 mV is negligible for most applications. The extended operating temperature range (-50°C to 100°C versus -20°C to 80°C) provides improved thermal margin. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) are maintained.

Secondary Recommendations (Active Status, Multi-Source Options):

B140-13-F (Diodes Incorporated) and SS14-E3/5AT / SS14-E3/61T (Vishay) offer the widest operating temperature ranges (-65°C to 150°C and -65°C to 125°C respectively) and are from established manufacturers with high inventory availability. Forward voltage is higher (500 mV), but reverse leakage is lower (200 µA), making these suitable for applications requiring extended temperature performance or lower leakage characteristics.
MBRA140T3G (onsemi) provides an alternative from a major semiconductor manufacturer with Active status and high inventory. Forward voltage is 550 mV with 500 µA reverse leakage.

Not Recommended for New Designs:

RB160L-40TE25 and RB162L-40TE25 (Rohm Semiconductor) carry "Not For New Designs" status and should be avoided for new applications despite electrical equivalence.

Obsolete Status:

SS14E-TP (Micro Commercial Co) is marked Obsolete and should not be selected for new designs or long-term production.

Compliance Verification:

All recommended substitute parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 ECCN classification, matching the regulatory profile of the CDBA140LL-G.

Frequently Asked Questions (FAQ)

Q1: Can I directly replace CDBA140LL-G with CDBA140LL-HF without circuit modification?

A: Yes. Both parts share identical electrical ratings (40V, 1A), Schottky technology, and DO-214AC package. The 10 mV increase in forward voltage (340 mV to 350 mV) is within typical circuit tolerance margins. The extended temperature range of CDBA140LL-HF provides additional design margin.

Q2: What is the significance of the forward voltage (Vf) differences among substitute parts?

A: Forward voltage determines the voltage drop across the diode during conduction. The CDBA140LL-G specifies 340 mV at 1A, while substitutes range from 350 mV to 600 mV. Higher forward voltage increases power dissipation and heat generation. Applications with tight power budgets or thermal constraints should select substitutes with lower Vf values (CDBA140LL-HF at 350 mV or B140-13-F/SS14 series at 500 mV).

Q3: Why do some substitute parts have higher reverse leakage current?

A: Reverse leakage current (Ir) is the small current that flows when the diode is reverse-biased. The CDBA140LL-G specifies 1 mA at 40V, while some substitutes specify 200 µA to 500 µA. Higher leakage increases standby power consumption and may affect precision analog circuits. Applications sensitive to leakage should prioritize parts with lower Ir specifications (RB160L-40TE25 at 100 µA or B140-E3/5AT/SS14 series at 200 µA).

Q4: Does the operating temperature range affect substitution compatibility?

A: Operating temperature range defines the junction temperature limits for reliable operation. The CDBA140LL-G operates from -20°C to 80°C. Substitute parts with wider ranges (e.g., -65°C to 150°C) are compatible for applications within the original part's temperature window and provide additional margin for extreme environments. Narrower ranges are not suitable if the application requires the full original temperature span.

Q5: Are all substitute parts available in the same package?

A: Yes. All listed substitute parts use the DO-214AC (SMA) surface mount package, ensuring mechanical compatibility with existing PCB layouts and assembly equipment. Packaging format (Tape & Reel or Cut Tape) may vary by supplier but does not affect electrical or mechanical compatibility.

Q6: What is the difference between "Active" and "Not For New Designs" product status?

A: "Active" status indicates the manufacturer continues production and supports the part for new designs. "Not For New Designs" indicates the part is in end-of-life phase and the manufacturer recommends migration to successor products. For new applications, select only parts with Active status (CDBA140LL-HF, B140-13-F, MBRA140T3G, SS14-E3/5AT, SS14-E3/61T).

Q7: Can I use SS14E-TP as a substitute despite its Obsolete status?

A: No. Obsolete parts should not be selected for new designs or production applications. Availability is limited, manufacturer support is discontinued, and long-term supply cannot be assured. Use only Active status alternatives.

Q8: How do I determine which substitute is best for my application?

A: Prioritize based on: (1) Product Status (Active only for new designs); (2) Forward Voltage (lower Vf for power-sensitive applications); (3) Reverse Leakage (lower Ir for precision analog circuits); (4) Operating Temperature Range (select range that covers your application environment); (5) Manufacturer (multi-source from established suppliers for supply chain resilience).

Q9: Are there any compliance or certification differences between the main part and substitutes?

A: No. All parts listed maintain identical ROHS3 compliance, REACH Unaffected status, and EAR99 ECCN classification. Moisture Sensitivity Level (MSL 1 - Unlimited) is consistent across all parts, indicating no special moisture handling requirements during storage or assembly.

Q10: What packaging options are available for substitute parts?

A: Substitute parts are available in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel® formats. Both formats contain the same DO-214AC (SMA) component and are compatible with standard surface mount assembly equipment. Selection between TR and CT depends on production volume and inventory management preferences, not electrical compatibility.

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