CDBA5819-G Schottky Diode 40V 1A Equivalent & Substitute Parts

Part Overview

The CDBA5819-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 Active product status and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Schottky diodes in the 40V/1A category are widely used in power supply circuits, reverse polarity protection, and high-frequency switching applications. Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required, or when design optimization calls for different electrical characteristics within the same functional class.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) Maximum @ If	600 mV @ 1 A	mV @ A
Speed - Fast Recovery	≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-65 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the CDBA5819-G is determined by strict electrical and mechanical parameter matching within the Schottky diode 40V/1A category. The following parameters establish substitution eligibility:

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, SMA (exact match required)

Secondary Electrical Parameters (within acceptable ranges):

Voltage - Forward (Vf) Maximum @ If: 500–650 mV @ 1–2 A (acceptable variation)
Current - Reverse Leakage @ Vr: 12–500 µA @ 40 V (acceptable variation)
Speed - Fast Recovery: ≤ 500ns, > 200mA (Io) (exact match required)
Operating Temperature - Junction: -65°C to 150°C (acceptable variation)

Compliance Requirements:

RoHS Status: ROHS3 Compliant (required)
Moisture Sensitivity Level: MSL 1 (required)
REACH Status: REACH Unaffected (required)

Substitute parts are grouped by product status (Active, Not For New Designs, Obsolete) and packaging format (Tape & Reel, Cut Tape & Digi-Reel). Parts with Active status are preferred for new designs; parts marked Not For New Designs or Obsolete are listed for reference and legacy system support only.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) mV @ If	Reverse Leakage µA @ 40V	Tj (°C)	Packaging	Product Status
CDBA5819-G	Comchip Technology	40	1	600 @ 1A	500	-65 to 125	Tape & Reel (TR)	Active
B140-13-F	Diodes Incorporated	40	1	500 @ 1A	500	-65 to 150	Cut Tape (CT) & Digi-Reel®	Active
B140-E3/5AT	Vishay General Semiconductor - Diodes Division	40	1	520 @ 1A	200	-65 to 125	Tape & Reel (TR)	Active
B140-E3/61T	Vishay General Semiconductor - Diodes Division	40	1	520 @ 1A	200	-65 to 125	Cut Tape (CT) & Digi-Reel®	Active
RB160L-40TE25	Rohm Semiconductor	40	1	550 @ 1A	100	-55 to 150	Cut Tape (CT) & Digi-Reel®	Not For New Designs
RB162L-40TE25	Rohm Semiconductor	40	1	550 @ 1A	500	-55 to 150	Cut Tape (CT) & Digi-Reel®	Not For New Designs
SS14-E3/5AT	Vishay General Semiconductor - Diodes Division	40	1	500 @ 1A	200	-65 to 125	Tape & Reel (TR)	Active
SS14-E3/61T	Vishay General Semiconductor - Diodes Division	40	1	500 @ 1A	200	-65 to 125	Cut Tape (CT) & Digi-Reel®	Active
SS14E-TP	Micro Commercial Co	40	1	600 @ 1A	500	-55 to 150	Tape & Reel (TR)	Obsolete
STPS140A	STMicroelectronics	40	1	550 @ 1A	12	-40 to 150	Cut Tape (CT) & Digi-Reel®	Active
STPS140AY	STMicroelectronics	40	1	650 @ 2A	12	-40 to 150	Cut Tape (CT) & Digi-Reel®	Active

Engineering Selection Recommendations

For New Designs (Active Status Parts):

Parts with Active product status are suitable for new circuit designs and long-term production commitments. The following Active substitutes are electrically and mechanically compatible with CDBA5819-G:

B140-13-F (Diodes Incorporated): Offers lower forward voltage (500 mV @ 1A) and extended junction temperature range to 150°C. Available in Cut Tape & Digi-Reel® packaging.
B140-E3/5AT and B140-E3/61T (Vishay): Provide reduced reverse leakage (200 µA @ 40V) compared to the main part. Available in both Tape & Reel and Cut Tape formats. Junction temperature range matches CDBA5819-G (-65 to 125°C).
SS14-E3/5AT and SS14-E3/61T (Vishay): Equivalent electrical performance to B140 series with 500 mV forward voltage and 200 µA reverse leakage. Available in Tape & Reel and Cut Tape & Digi-Reel® packaging.
STPS140A (STMicroelectronics): Exhibits superior reverse leakage characteristics (12 µA @ 40V) and extended junction temperature to 150°C. Forward voltage is 550 mV @ 1A. Available in Cut Tape & Digi-Reel® packaging.
STPS140AY (STMicroelectronics): Automotive-grade variant with 12 µA reverse leakage and -40 to 150°C junction temperature range. Forward voltage specification is 650 mV @ 2A. Available in Cut Tape & Digi-Reel® packaging.

For Legacy System Support (Not For New Designs / Obsolete Status Parts):

RB160L-40TE25 and RB162L-40TE25 (Rohm Semiconductor): Marked as Not For New Designs. These parts are available for replacement in existing systems but should not be selected for new circuit development.
SS14E-TP (Micro Commercial Co): Marked as Obsolete. This part is provided for reference only in legacy system documentation and should not be used for new designs or production.

Packaging Considerations:

Original CDBA5819-G is supplied in Tape & Reel (TR) format. Equivalent parts in Cut Tape & Digi-Reel® format (B140-13-F, B140-E3/61T, SS14-E3/61T, STPS140A, STPS140AY) are suitable for automated assembly and reel-based pick-and-place operations.
Tape & Reel alternatives (B140-E3/5AT, SS14-E3/5AT, SS14E-TP) maintain the same packaging format as the original part.

Compliance Status:

All listed substitute parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity level, matching the compliance profile of CDBA5819-G.

Frequently Asked Questions (FAQ)

Q1: Can I substitute CDBA5819-G with any 40V Schottky diode?

A: No. Substitution requires exact matching of voltage rating (40V), current rating (1A), technology (Schottky), mounting type (Surface Mount), and package (DO-214AC/SMA). Additionally, fast recovery speed (≤ 500ns, > 200mA) must be maintained. Only parts listed in this reference meet all substitution criteria.

Q2: What is the difference between Tape & Reel and Cut Tape & Digi-Reel® packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape wound on a reel, suitable for high-volume automated assembly. Cut Tape & Digi-Reel® packaging provides components on cut tape segments or alternative reel formats, often used for lower-volume production or mixed-component assembly. Both formats are compatible with standard surface mount assembly equipment; selection depends on production volume and equipment configuration.

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

A: Reverse leakage current (Ir) varies among manufacturers due to different semiconductor process technologies and quality control standards. Parts like STPS140A (12 µA @ 40V) exhibit lower leakage than CDBA5819-G (500 µA @ 40V). Lower leakage is generally beneficial in low-power applications and does not prevent substitution, as the part still meets the 40V/1A functional requirement.

Q4: Can I use STPS140AY in place of CDBA5819-G?

A: STPS140AY is electrically compatible and meets all primary matching criteria (40V, 1A, Schottky, Surface Mount, DO-214AC/SMA). However, note that STPS140AY is specified as automotive-grade with forward voltage rated at 650 mV @ 2A (versus 600 mV @ 1A for CDBA5819-G). The higher forward voltage specification at 2A does not affect 1A operation. STPS140AY is suitable for substitution in applications where automotive-grade reliability is acceptable or required.

Q5: Should I use parts marked "Not For New Designs"?

A: Parts marked "Not For New Designs" (RB160L-40TE25, RB162L-40TE25) are listed for reference in legacy system maintenance and repair only. For new circuit designs and production, select only parts with Active product status: B140-13-F, B140-E3/5AT, B140-E3/61T, SS14-E3/5AT, SS14-E3/61T, STPS140A, or STPS140AY.

Q6: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. Both CDBA5819-G and all listed substitute parts carry MSL 1 classification, eliminating moisture-related compatibility concerns during substitution.

Q7: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference are ROHS3 compliant and REACH unaffected, matching the compliance status of CDBA5819-G. This ensures regulatory compatibility in applications subject to environmental and hazardous substance restrictions.

Q8: Can forward voltage differences affect circuit performance?

A: Forward voltage (Vf) variations among substitute parts range from 500 mV to 650 mV @ 1A. In most rectifier and protection applications, this variation (±50–75 mV) has minimal impact on circuit performance. However, in precision analog circuits or applications with tight voltage budgets, forward voltage differences should be evaluated against specific circuit requirements. All listed parts remain functionally equivalent for standard 40V/1A Schottky diode applications.

Q9: What is the significance of fast recovery speed ≤ 500ns?

A: Fast recovery speed (≤ 500ns, > 200mA) indicates the diode switches from forward to reverse bias state within 500 nanoseconds at currents exceeding 200mA. This specification is critical for high-frequency switching applications and power supply circuits. All substitute parts maintain this speed specification, ensuring compatibility in switching and rectification applications.

Q10: Can I mix different substitute parts in the same circuit board?

A: Yes. All substitute parts meet identical electrical and mechanical specifications for the 40V/1A Schottky diode function. Mixing different manufacturers or part numbers in the same circuit is acceptable from an engineering standpoint, provided all parts are sourced from the same production batch or lot to ensure consistency in reverse leakage and forward voltage characteristics within acceptable tolerances.

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