CDBA120L-G Schottky Diode Equivalent & Substitute Parts

Part Overview

The CDBA120L-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 surface mount DO-214AC (SMA) package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement continuity.

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 essential. The obsolete status of CDBA120L-G requires engineers to select from active alternatives that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	380 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	1 mA @ 20 V	mA
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction (Max)	125	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CDBA120L-G is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 20 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Technology: Schottky (fast recovery diode)
Package / Case: DO-214AC (SMA) surface mount
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Surface Mount

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Variations within typical Schottky diode range (380–530 mV @ 1 A) are acceptable
Current - Reverse Leakage @ Vr: Variations from 1 mA to 10 µA @ 20 V are acceptable
Operating Temperature - Junction: Range variations are acceptable provided maximum rating ≥ 125°C or application requirements are met

Non-Substitutable Variants:

CDBA140L-HF: 40 V reverse voltage rating exceeds application requirements and represents a different voltage class; not a direct substitute for 20 V applications

The following parts meet all primary substitution criteria and are classified as direct equivalents or active substitutes for CDBA120L-G.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [mV]	Reverse Leakage @ Vr [µA/mA]	Package	Product Status	RoHS Status
CDBA120L-G	Comchip Technology	20	1	380	1 mA @ 20V	DO-214AC (SMA)	Obsolete	—
B120-13-F	Diodes Incorporated	20	1	500	500 µA @ 20V	DO-214AC (SMA)	Active	ROHS3 Compliant
B120-E3/5AT	Vishay General Semiconductor - Diodes Division	20	1	520	200 µA @ 20V	DO-214AC (SMA)	Active	ROHS3 Compliant
B120-E3/61T	Vishay General Semiconductor - Diodes Division	20	1	520	200 µA @ 20V	DO-214AC (SMA)	Active	ROHS3 Compliant
MBRA120ET3G	onsemi	20	1	530	10 µA @ 20V	DO-214AC (SMA)	Active	ROHS3 Compliant
SS12	Taiwan Semiconductor Corporation	20	1	500	200 µA @ 20V	DO-214AC (SMA)	Active	ROHS3 Compliant
SS12-E3/5AT	Vishay General Semiconductor - Diodes Division	20	1	500	200 µA @ 20V	DO-214AC (SMA)	Active	ROHS3 Compliant

Engineering Selection Recommendations

All identified substitute parts are active products with ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements for electronic component procurement.

Selection Basis:

Direct Electrical Equivalents: B120-13-F, B120-E3/5AT, B120-E3/61T, MBRA120ET3G, SS12, and SS12-E3/5AT all satisfy the primary substitution criteria of 20 V reverse voltage, 1 A average rectified current, and DO-214AC (SMA) surface mount package.
Forward Voltage Characteristics: The CDBA120L-G specifies 380 mV maximum forward voltage at 1 A. Substitute parts exhibit forward voltages ranging from 500–530 mV at 1 A. This variation is within acceptable Schottky diode performance envelope and does not preclude substitution; however, applications with strict power dissipation budgets should account for the increased forward voltage drop.
Reverse Leakage Current: The CDBA120L-G specifies 1 mA reverse leakage at 20 V. Substitute parts exhibit lower reverse leakage (10 µA to 500 µA at 20 V), representing improved performance characteristics.
Packaging and Mounting: All substitute parts are supplied in DO-214AC (SMA) surface mount package, ensuring mechanical and footprint compatibility with existing PCB designs.
Compliance and Availability: All substitute parts carry ROHS3 compliance certification and are classified as active products with confirmed inventory availability, ensuring long-term procurement viability.

Frequently Asked Questions (FAQ)

Q1: Can CDBA140L-HF be used as a substitute for CDBA120L-G?

A: No. CDBA140L-HF is rated for 40 V reverse voltage, which represents a different voltage class. While it shares the same 1 A current rating and DO-214AC package, the elevated voltage rating does not constitute a direct substitute for 20 V applications. Use of a higher voltage-rated diode in a 20 V circuit is not a substitution; it is a design change that may introduce unintended performance variations.

Q2: What is the primary difference between B120-13-F and B120-E3/5AT?

A: Both parts are rated for 20 V reverse voltage and 1 A average rectified current in DO-214AC (SMA) package. The primary difference is packaging format: B120-13-F is supplied in Cut Tape (CT) & Digi-Reel format, while B120-E3/5AT is supplied in Tape & Reel (TR) format. Electrical specifications are equivalent. Selection between these parts is determined by procurement and assembly requirements.

Q3: Why does MBRA120ET3G show lower reverse leakage current (10 µA) compared to the original CDBA120L-G (1 mA)?

A: Lower reverse leakage current represents improved device characteristics and does not preclude substitution. Reverse leakage is a temperature and voltage-dependent parameter; lower leakage values indicate superior device quality and reduced power dissipation in reverse bias conditions. This is a beneficial variation for circuit performance.

Q4: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts carry ROHS3 Compliant certification. The original CDBA120L-G does not specify RoHS status. Substitution with ROHS3-compliant parts ensures compliance with current regulatory requirements for electronic component procurement and end-product environmental standards.

Q5: Can SS12 and SS12-E3/5AT be used interchangeably?

A: Both parts are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications (20 V reverse voltage, 1 A current, 500 mV forward voltage at 1 A, 200 µA reverse leakage). The difference is packaging format: SS12 is supplied in Cut Tape (CT) & Digi-Reel format, while SS12-E3/5AT is supplied in Tape & Reel (TR) format. Electrical interchangeability is confirmed; selection is based on procurement format requirements.

Q6: What is the operating temperature range consideration for substitute selection?

A: The original CDBA120L-G specifies maximum junction temperature of 125°C. All substitute parts meet or exceed this requirement, with operating ranges from −65°C to −55°C (minimum) and 125°C to 150°C (maximum). Selection based on operating temperature is not a limiting factor for any identified substitute part.

Q7: Is the DO-214AC package identical to SMA package designation?

A: Yes. DO-214AC and SMA (Surface Mount Axial) refer to the same physical package form factor. Both designations are used interchangeably in component specifications. All identified substitute parts are mechanically compatible with existing PCB designs specified for CDBA120L-G.

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