CDBA120LL-G Schottky Diode Equivalent & Substitute Parts

Part Overview

The CDBA120LL-G is a Schottky rectifier diode manufactured by Comchip Technology, rated for 20 V DC reverse voltage and 1 A average rectified current in a DO-214AC (SMA) surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Schottky diodes in this voltage and current class are widely used in power supply circuits, reverse polarity protection, and high-frequency switching applications where fast recovery characteristics are required. The 20 V / 1 A rating with fast recovery performance (≤500 ns) defines the functional requirements for direct substitution.

Substiute Parts

CDBA120LL-G

Comchip TechnologyIn Stock: 1059CDBA120LL-G Datasheet

Current PartRFQ

CDBA140LL-HF

Comchip TechnologyIn Stock: 42699CDBA140LL-HF Datasheet

DirectRFQ

B120-13-F

Diodes IncorporatedIn Stock: 109117B120-13-F Datasheet

MFR RecommendedRFQ

B120-E3/61T

Vishay General Semiconductor - Diodes DivisionIn Stock: 25394B120-E3/61T Datasheet

MFR RecommendedRFQ

MBRA120ET3G

onsemiIn Stock: 16646MBRA120ET3G Datasheet

MFR RecommendedRFQ

SS12

Taiwan Semiconductor CorporationIn Stock: 65317SS12 Datasheet

MFR RecommendedRFQ

SS12-E3/61T

Vishay General Semiconductor - Diodes DivisionIn Stock: 71963SS12-E3/61T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDBA120LL-G is determined by the following critical parameters:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 20 V minimum
• Current - Average Rectified (Io): 1 A minimum
• Technology: Schottky
• Package / Case: DO-214AC or SMA (surface mount)
• Speed: Fast Recovery ≤500 ns, >200 mA

Allowable Variation Parameters:

• Voltage - Forward (Vf) (Max) @ If: Substitute parts may exceed the original 310 mV specification, provided the application circuit tolerates increased forward voltage drop
• Current - Reverse Leakage @ Vr: Substitute parts may have lower leakage current than the original 1 mA specification
• Operating Temperature - Junction: Substitute parts may have extended temperature ranges beyond the original 125°C maximum
• Product Status: Active parts are preferred over obsolete parts for long-term availability

Non-Substitutable Parameters:

• Reverse voltage rating below 20 V
• Average rectified current below 1 A
• Non-Schottky technology
• Non-surface-mount packages
• Recovery speed exceeding 500 ns

All substitute parts listed maintain the 20 V / 1 A Schottky diode specification with fast recovery characteristics and surface mount DO-214AC (SMA) packaging, ensuring functional equivalence in the original application circuit.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (20 V / 1 A Rating):

The following parts are direct functional equivalents to the CDBA120LL-G and maintain the original 20 V reverse voltage specification:

• B120-13-F (Diodes Incorporated): Active product status with extended temperature range (-65°C to 150°C). Forward voltage of 500 mV is 190 mV higher than the original specification; verify circuit tolerance for increased power dissipation.

• B120-E3/61T (Vishay General Semiconductor - Diodes Division): Active product status with temperature range -65°C to 125°C. Forward voltage of 520 mV requires circuit verification for thermal performance.

• MBRA120ET3G (onsemi): Active product status with extended temperature range (-55°C to 150°C). Forward voltage of 530 mV is the highest among direct substitutes; lowest reverse leakage current (10 µA) provides superior blocking characteristics.

• SS12-E3/61T (Vishay General Semiconductor - Diodes Division): Active product status with temperature range -65°C to 125°C. Forward voltage of 500 mV matches B120-13-F performance.

All direct substitutes are RoHS3 compliant and REACH unaffected, meeting modern environmental and regulatory requirements.

Higher Voltage Alternative:

• CDBA140LL-HF (Comchip Technology): 40 V reverse voltage rating provides overvoltage margin beyond the original 20 V specification. Forward voltage of 350 mV is lower than the original 310 mV, reducing power dissipation. Active product status ensures availability. Operating temperature maximum of 100°C is lower than the original 125°C; verify thermal requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a 40 V Schottky diode (CDBA140LL-HF) as a substitute for the 20 V CDBA120LL-G?

A: Yes, the CDBA140LL-HF is functionally compatible. The higher 40 V reverse voltage rating provides additional overvoltage protection margin. The lower forward voltage (350 mV vs. 310 mV) reduces power dissipation. However, the maximum operating temperature is 100°C compared to the original 125°C; verify that your application does not exceed this thermal limit.

Q: What is the difference between the various 20 V / 1 A substitutes?

A: All listed 20 V / 1 A substitutes (B120-13-F, B120-E3/61T, MBRA120ET3G, SS12-E3/61T) meet the core electrical requirements. Differences exist in forward voltage drop (500–530 mV vs. original 310 mV), reverse leakage current (10–500 µA vs. original 1 mA), and operating temperature ranges. Select based on circuit tolerance for forward voltage and thermal performance requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes, all listed substitute parts are RoHS3 compliant and REACH unaffected, meeting current environmental regulations.

Q: Does the DO-214AC package differ from SMA?

A: DO-214AC and SMA refer to the same surface mount package. Both designations are used interchangeably in industry documentation. All listed parts use this identical package footprint and are mechanically interchangeable.

Q: Why is the forward voltage higher in substitute parts?

A: Forward voltage variation is inherent to Schottky diode manufacturing and design. The original CDBA120LL-G specifies 310 mV, while active substitutes range from 500–530 mV. This difference reflects manufacturing process variations and design trade-offs. Verify that your circuit power budget accommodates the higher voltage drop.

Q: Can I mix different substitute parts in the same design?

A: Yes, provided all parts meet the minimum electrical requirements (20 V, 1 A, fast recovery, surface mount). However, for consistency in thermal performance and power dissipation, use a single part number across the design.

Q: What is the significance of the MSL (Moisture Sensitivity Level) rating?

A: All listed parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. These parts can be stored and handled without special moisture control measures, simplifying supply chain management.