CDBA5817-G Schottky Diode 20V 1A DO-214AC Equivalent & Substitute Parts

Part Overview

The CDBA5817-G is a Schottky rectifier diode manufactured by Comchip Technology, rated for 20V DC reverse voltage and 1A 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 production and maintenance applications. Substitute parts must maintain electrical compatibility within the specified voltage, current, and thermal operating parameters while accommodating available packaging and delivery formats.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	450	mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500	µA @ 20 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-65 to 125	°C
Technology	Schottky	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CDBA5817-G is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 20V
Current - Average Rectified (Io): Must equal or exceed 1A
Technology: Schottky rectifier diode
Mounting Type: Surface Mount
Package / Case: DO-214AC (SMA)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature Range: Must accommodate -65°C to 125°C junction temperature

Acceptable Variations:

Forward voltage (Vf) may vary within normal manufacturing tolerances
Reverse leakage current (Ir) may be lower than the original specification
Packaging format (Tape & Reel or Cut Tape) does not affect electrical compatibility
RoHS3 compliance status does not affect functional substitution

All identified substitute parts meet these criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [mV]	Ir @ Vr [µA]	Tj Range [°C]	Product Status	Packaging
CDBA5817-G	Comchip Technology	20	1	450	500 @ 20V	-65 to 125	Obsolete	—
B120-13-F	Diodes Incorporated	20	1	500	500 @ 20V	-65 to 150	Active	Cut Tape (CT) & Digi-Reel®
B120-E3/5AT	Vishay General Semiconductor - Diodes Division	20	1	520	200 @ 20V	-65 to 125	Active	Tape & Reel (TR)
B120-E3/61T	Vishay General Semiconductor - Diodes Division	20	1	520	200 @ 20V	-65 to 125	Active	Cut Tape (CT)
SS12-E3/5AT	Vishay General Semiconductor - Diodes Division	20	1	500	200 @ 20V	-65 to 125	Active	Tape & Reel (TR)
SS12-E3/61T	Vishay General Semiconductor - Diodes Division	20	1	500	200 @ 20V	-65 to 125	Active	Tape & Reel (TR)
SSL12	Taiwan Semiconductor Corporation	20	1	390	200 @ 20V	-55 to 125	Active	Tape & Reel (TR)

Engineering Selection Recommendations

Direct Electrical Equivalents (20V, 1A Rating):

All substitute parts listed maintain identical voltage and current ratings to the CDBA5817-G. Selection among equivalent parts is determined by:

Product Status: All substitute parts are classified as Active, ensuring continued availability and manufacturing support. The original CDBA5817-G is Obsolete and should not be specified for new designs.
Compliance Certifications: All substitute parts carry ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements. The original part status is not specified for these certifications.
Packaging Format:
- Tape & Reel (TR) format is suitable for high-volume automated assembly
- Cut Tape (CT) format accommodates lower-volume or mixed-component requirements
- Selection depends on production volume and assembly equipment capability
Thermal Operating Range:
- B120-13-F (Diodes Incorporated) extends to 150°C junction temperature, providing additional thermal margin
- SSL12 (Taiwan Semiconductor Corporation) operates to -55°C minimum, which is 10°C higher than the original specification
- All other parts match the original -65°C to 125°C range
Forward Voltage Characteristics:
- SSL12 exhibits the lowest forward voltage (390 mV @ 1A), reducing power dissipation
- B120-13-F and SS12 series parts specify 500 mV @ 1A
- B120-E3 series parts specify 520 mV @ 1A
- Forward voltage differences are within normal Schottky diode manufacturing tolerances
Reverse Leakage Current:
- Vishay and Taiwan Semiconductor parts specify 200 µA @ 20V, lower than the original 500 µA specification
- Lower leakage current improves circuit efficiency and reduces standby power consumption

Recommended Primary Substitutes:

SS12-E3/61T (Vishay): Highest inventory (71,923 pcs), active status, standard thermal range, Cut Tape packaging
B120-13-F (Diodes Incorporated): Extended thermal range to 150°C, high inventory (109,100 pcs), multiple packaging options
SSL12 (Taiwan Semiconductor Corporation): Lowest forward voltage, active status, Tape & Reel packaging

Frequently Asked Questions (FAQ)

Q1: Can CDBA5817-G be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts are electrically compatible with CDBA5817-G. They maintain the same 20V reverse voltage rating, 1A average rectified current, DO-214AC (SMA) package, and fast recovery Schottky technology. Physical footprint and pin configuration are identical, enabling direct PCB substitution without layout modification.

Q2: What is the primary reason for substituting CDBA5817-G?

A: CDBA5817-G is classified as Obsolete. Comchip Technology no longer manufactures this part. All substitute parts are Active products with confirmed current manufacturing and distribution, ensuring long-term supply chain reliability for production and maintenance applications.

Q3: Are there electrical performance differences between the substitute parts?

A: Minor variations exist within normal Schottky diode manufacturing tolerances. Forward voltage ranges from 390 mV (SSL12) to 520 mV (B120-E3 series) at 1A. Reverse leakage current is either 200 µA or 500 µA at 20V. These variations do not affect functional compatibility in standard rectification applications. Circuit designers should verify forward voltage drop and leakage current specifications against application requirements for power-sensitive or precision circuits.

Q4: Does packaging format (Tape & Reel vs. Cut Tape) affect electrical performance?

A: No. Packaging format affects only delivery method and assembly process compatibility. Tape & Reel (TR) packaging is optimized for high-volume automated pick-and-place assembly. Cut Tape (CT) packaging accommodates lower-volume manual or semi-automated assembly. Electrical performance is identical regardless of packaging format.

Q5: Which substitute part offers the best thermal performance?

A: B120-13-F (Diodes Incorporated) specifies an operating junction temperature range of -65°C to 150°C, extending 25°C above the original CDBA5817-G specification of -65°C to 125°C. This provides additional thermal margin in high-temperature applications. All other substitute parts match the original -65°C to 125°C range.

Q6: Which substitute part has the lowest power dissipation?

A: SSL12 (Taiwan Semiconductor Corporation) exhibits the lowest forward voltage at 390 mV @ 1A, compared to 450 mV for the original CDBA5817-G and 500-520 mV for other substitutes. Lower forward voltage reduces power dissipation in the diode, resulting in lower heat generation and improved circuit efficiency. This characteristic is beneficial in battery-powered or thermally constrained applications.

Q7: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 Compliant status and REACH Unaffected designation. The original CDBA5817-G compliance status is not specified. RoHS3 compliance ensures the parts meet current environmental and hazardous substance restrictions for electronic components in regulated markets.

Q8: What is the difference between B120-E3/5AT and B120-E3/61T?

A: Both parts are manufactured by Vishay General Semiconductor - Diodes Division and share identical electrical specifications: 20V reverse voltage, 1A current rating, 520 mV forward voltage, and -65°C to 125°C operating range. The primary difference is packaging format: B120-E3/5AT is supplied in Tape & Reel (TR) format with 7,762 pcs inventory, while B120-E3/61T is supplied in Cut Tape (CT) format with 25,300 pcs inventory. Selection depends on assembly equipment and production volume requirements.

Q9: Can SSL12 be used in applications requiring operation below -55°C?

A: No. SSL12 specifies a minimum operating junction temperature of -55°C, which is 10°C higher than the original CDBA5817-G specification of -65°C. For applications requiring operation at -65°C, use B120-13-F, B120-E3/5AT, B120-E3/61T, SS12-E3/5AT, or SS12-E3/61T, all of which maintain the -65°C minimum junction temperature.

Q10: Which substitute part has the highest current inventory?

A: B120-13-F (Diodes Incorporated) has the highest inventory at 109,100 pcs. SS12-E3/61T (Vishay) is the second highest at 71,923 pcs. High inventory levels indicate strong supplier commitment and reduced lead time risk for procurement.

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