CDBB140-G Schottky Diode 40V 1A DO-214AA Equivalent & Substitute Parts

Part Overview

The CDBB140-G is a Schottky rectifier diode manufactured by Comchip Technology, rated for 40V DC reverse voltage and 1A average rectified current in a DO-214AA (SMB) surface mount package. This part is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent substitute parts is necessary for ongoing production support, maintenance applications, and design continuity where this component is currently deployed.

The CDBB140-G operates with a maximum forward voltage of 500 mV at 1A and exhibits fast recovery characteristics (≤500ns for currents >200mA). It is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the CDBB140-G is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

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

Secondary Compatibility Factors:

Forward Voltage (Vf) @ 1A: Must not exceed 550 mV to maintain circuit performance
Reverse Leakage Current @ 40V: Acceptable range 100 µA to 1 mA
Operating Temperature Range: Minimum -55°C to +150°C junction temperature capability
RoHS Compliance: ROHS3 compliant preferred for regulatory alignment

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (Active Status, Full Compliance): Parts meeting all primary criteria with active product status and ROHS3 compliance. These include CDBB140-HF, B140B-13-F, B140HB-13-F, STPS1L40UY, and STPS1L40U.

Category B - Functional Equivalents (Active Status, Compliance Variations): Parts meeting all primary criteria but with minor parameter variations or non-compliant status. These include 5819SMJ/TR13 (RoHS non-compliant), STPS140U, and STPS140UY.

Category C - Higher Current Alternatives (Not Direct Substitutes): Parts with identical voltage and package but higher current ratings (2A or 3A). These are listed for reference only and represent design upgrades rather than direct substitutes.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ If (mV)	Reverse Leakage @ 40V (µA)	Tj (°C)	RoHS Status	Product Status	Packaging
CDBB140-G	Comchip Technology	40	1	500 @ 1A	500	125 (Max)	ROHS3	Not For New Designs	TR
CDBB140-HF	Comchip Technology	40	1	500 @ 1A	500	-50 to 175	ROHS3	Active	TR
B140B-13-F	Diodes Incorporated	40	1	500 @ 1A	500	-65 to 150	ROHS3	Active	CT
B140HB-13-F	Diodes Incorporated	40	1	530 @ 1A	100	-55 to 150	ROHS3	Active	TR
5819SMJ/TR13	Microchip Technology	40	1	550 @ 1A	1000	-55 to 150	Non-compliant	Active	TR
STPS140U	STMicroelectronics	40	1	550 @ 1A	12	150 (Max)	ROHS3	Active	CT
STPS140UY	STMicroelectronics	40	1	650 @ 2A	12	-40 to 150	ROHS3	Active	TR
STPS1L40U	STMicroelectronics	40	1	500 @ 1A	35	150 (Max)	ROHS3	Active	CT
STPS1L40UY	STMicroelectronics	40	1	500 @ 1A	35	-40 to 150	ROHS3	Active	TR

Engineering Selection Recommendations

For Direct Replacement (Highest Compatibility):

CDBB140-HF is the primary recommended substitute. It is manufactured by the same supplier (Comchip Technology), maintains identical electrical specifications at the 1A operating point, and carries active product status with ROHS3 compliance. The extended operating temperature range (-50°C to +175°C) provides superior thermal margin compared to the original CDBB140-G.

For Alternative Sourcing (Active Status, Full Compliance):

B140B-13-F (Diodes Incorporated) and B140HB-13-F (Diodes Incorporated) are functionally equivalent alternatives with active product status and ROHS3 compliance. B140B-13-F offers the widest operating temperature range (-65°C to +150°C) and is available in Cut Tape packaging. B140HB-13-F provides lower reverse leakage current (100 µA versus 500 µA) and is available in Tape & Reel format.

For Automotive Applications:

STPS1L40UY (STMicroelectronics) is designated as automotive grade with Series Q classification. It maintains the 500 mV forward voltage specification at 1A, operates across -40°C to +150°C, and carries ROHS3 compliance. This part is suitable for applications requiring automotive-qualified components.

For General Industrial Use:

STPS1L40U (STMicroelectronics) provides equivalent electrical performance in Cut Tape packaging with high inventory availability. STPS140U offers similar specifications with standard industrial temperature range.

Not Recommended for Direct Substitution:

5819SMJ/TR13 (Microchip Technology) is not recommended despite active status due to RoHS non-compliance, which may conflict with regulatory requirements in new designs or updated supply chains.

STPS140UY exhibits forward voltage specification at 2A (650 mV) rather than 1A, making direct parameter comparison difficult for 1A circuit applications.

STPS2L40U and STPS340U are higher current devices (2A and 3A respectively) and represent design upgrades rather than direct substitutes.

Frequently Asked Questions (FAQ)

Q1: Can CDBB140-HF be used as a direct replacement for CDBB140-G without circuit modification?

A: Yes. CDBB140-HF maintains identical electrical specifications at the 1A operating point (40V reverse voltage, 500 mV forward voltage @ 1A, fast recovery ≤500ns). Both use DO-214AA (SMB) surface mount packaging. The primary difference is product status (Active versus Not For New Designs) and extended operating temperature range in CDBB140-HF. No circuit modification is required.

Q2: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape wound on reels, suitable for high-volume automated assembly. Cut Tape (CT) packaging supplies components on tape segments cut to specific lengths, suitable for lower-volume orders or mixed-component kits. Both formats contain identical components in DO-214AA (SMB) packages. Selection depends on production volume and assembly equipment compatibility, not electrical performance.

Q3: Why does STPS140UY list forward voltage at 2A instead of 1A?

A: STPS140UY forward voltage is specified at 650 mV @ 2A, whereas CDBB140-G is specified at 500 mV @ 1A. This reflects different measurement conditions. At the 1A operating point, STPS140UY forward voltage would be lower than the 650 mV specification. However, direct comparison at identical current levels is not provided in the datasheet parameters. For circuits requiring precise forward voltage matching at 1A, STPS1L40UY (500 mV @ 1A) is preferred.

Q4: Is 5819SMJ/TR13 acceptable for new production designs?

A: 5819SMJ/TR13 carries RoHS non-compliant status, which disqualifies it for new production designs subject to RoHS3 regulations. It is suitable only for legacy product support or applications where RoHS compliance is not required. For new designs, select from ROHS3-compliant alternatives: CDBB140-HF, B140B-13-F, B140HB-13-F, STPS1L40UY, STPS1L40U, or STPS140U.

Q5: What is the significance of reverse leakage current variation across substitute parts?

A: Reverse leakage current ranges from 12 µA (STPS140U, STPS140UY) to 1000 µA (5819SMJ/TR13) at 40V. Lower leakage current (12-100 µA) indicates superior junction quality and is preferred for precision analog circuits, high-impedance applications, and low-power standby conditions. Higher leakage (500-1000 µA) is acceptable for general-purpose rectification and power conversion applications. Circuit requirements determine acceptable leakage limits.

Q6: Can STPS2L40U or STPS340U be used if higher current capacity is needed?

A: STPS2L40U (2A) and STPS340U (3A) are not direct substitutes for CDBB140-G (1A) because they have different current ratings. However, they maintain the same 40V reverse voltage and DO-214AA (SMB) package. If circuit redesign permits higher current capacity, these parts can be used as upgrades. Verify that PCB trace sizing, thermal management, and circuit topology support the higher current before substitution.

Q7: Which substitute part offers the best thermal performance?

A: CDBB140-HF offers the widest operating temperature range (-50°C to +175°C junction temperature), providing the greatest thermal margin. STPS1L40UY and STPS140UY both specify -40°C to +150°C operating range with automotive qualification. For applications requiring maximum thermal headroom, CDBB140-HF is recommended.

Q8: Are all substitute parts available in both Tape & Reel and Cut Tape formats?

A: No. Packaging format availability varies by manufacturer and part number. CDBB140-HF, B140HB-13-F, 5819SMJ/TR13, STPS140UY, and STPS1L40UY are available in Tape & Reel (TR) format. B140B-13-F, STPS140U, and STPS1L40U are available in Cut Tape (CT) format. Verify packaging availability with your supplier before finalizing part selection.

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