CDBA340LL-G Schottky Diode 40V 3A DO-214AC Equivalent & Substitute Parts

Part Overview

The CDBA340LL-G is a Schottky rectifier diode manufactured by Comchip Technology, rated for 40V DC reverse voltage and 3A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as obsolete product status. Due to obsolescence and limited availability, identifying equivalent and substitute parts is necessary for design continuity, procurement flexibility, and long-term supply chain management. Substitute parts must maintain electrical compatibility within the specified voltage and current parameters while accommodating mechanical and thermal requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	400 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	1.5	mA @ 40 V
Technology	Schottky	—
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

Substitute parts for the CDBA340LL-G are classified into two functional categories based on electrical parameter compatibility:

Category 1: Direct Parametric Equivalents (3A Rating) Parts that maintain the full 3A average rectified current specification and identical 40V reverse voltage rating. These parts are electrically interchangeable with the main part and require no circuit redesign.

Category 2: Reduced Current Substitutes (1A to 1.5A Rating) Parts with lower average rectified current ratings (1A or 1.5A) compared to the main part's 3A specification. These parts share the same 40V reverse voltage and DO-214AC package but operate at reduced current capacity. Selection of these parts requires circuit analysis to confirm that application current demands do not exceed the substitute part's rating.

Key Parameters Determining Substitution:

Voltage - DC Reverse (Vr) (Max): Must equal 40V
Technology: Must be Schottky
Package / Case: Must be DO-214AC or SMA
Mounting Type: Must be Surface Mount
Current - Average Rectified (Io): Must meet or exceed application requirements

Parameter Comparison

Parameter	CDBA340LL-G (Main)	CDBA340L-G	B340LA-13-F	10MQ040NTR	B140-13-F
Manufacturer	Comchip Technology	Comchip Technology	Diodes Incorporated	Vishay General Semiconductor	Diodes Incorporated
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V	40 V	40 V
Current - Average Rectified (Io)	3 A	3 A	3 A	1.5 A	1 A
Voltage - Forward (Vf) (Max) @ If	400 mV @ 3 A	400 mV @ 3 A	450 mV @ 3 A	540 mV @ 1 A	500 mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	1.5 mA @ 40 V	1.5 mA @ 40 V	2 mA @ 40 V	500 µA @ 40 V	500 µA @ 40 V
Technology	Schottky	Schottky	Schottky	Schottky	Schottky
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Operating Temperature - Junction	125°C (Max)	125°C (Max)	-55°C ~ 125°C	-55°C ~ 150°C	-65°C ~ 150°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: CDBA340L-G The CDBA340L-G is the recommended primary substitute for the CDBA340LL-G. Both parts are manufactured by Comchip Technology and share identical electrical specifications: 40V reverse voltage, 3A average rectified current, 400mV forward voltage at 3A, and fast recovery characteristics. The CDBA340L-G differs only in packaging format (Tape & Reel versus bulk) and product status (Active versus Obsolete). This part maintains full electrical compatibility and requires no circuit modifications. ROHS3 compliance provides regulatory advantage over the main part.

Secondary Substitute: B340LA-13-F The B340LA-13-F manufactured by Diodes Incorporated is a direct electrical equivalent with 40V reverse voltage and 3A average rectified current. Forward voltage is 450mV at 3A, representing a 50mV increase compared to the main part. Reverse leakage current is 2mA at 40V, slightly elevated from the main part's 1.5mA. Operating temperature range extends to -55°C to 125°C. This part is ROHS3 compliant and maintains full current capacity. Selection is appropriate when Diodes Incorporated supply chain preference exists or when the extended lower temperature rating is required.

Reduced Current Substitutes: 10MQ040NTR and B140-13-F The 10MQ040NTR (Vishay, 1.5A) and B140-13-F (Diodes Incorporated, 1A) are reduced-current alternatives. Both maintain 40V reverse voltage and fast recovery characteristics but operate at lower current ratings. These parts are suitable only when circuit analysis confirms that application current demands do not exceed 1.5A (for 10MQ040NTR) or 1A (for B140-13-F). The 10MQ040NTR is RoHS non-compliant, which may present regulatory constraints. The B140-13-F is ROHS3 compliant with extended operating temperature range (-65°C to 150°C).

Compliance Considerations: All substitute parts except 10MQ040NTR are ROHS3 compliant. All parts maintain REACH Unaffected status and EAR99 export classification. Moisture Sensitivity Level 1 (Unlimited) is consistent across all parts.

Frequently Asked Questions (FAQ)

Q1: Can CDBA340L-G be used as a direct replacement for CDBA340LL-G? Yes. The CDBA340L-G is a direct parametric equivalent with identical electrical specifications: 40V reverse voltage, 3A average rectified current, 400mV forward voltage at 3A, and fast recovery characteristics. The only differences are packaging format and product status. No circuit modifications are required.

Q2: What is the difference between CDBA340LL-G and CDBA340L-G? Both parts are manufactured by Comchip Technology with identical electrical ratings. The primary difference is packaging: CDBA340LL-G is supplied in bulk packaging, while CDBA340L-G is supplied in Tape & Reel format. CDBA340L-G has Active product status compared to the obsolete status of CDBA340LL-G. Electrical performance is identical.

Q3: Can B340LA-13-F replace CDBA340LL-G in all applications? B340LA-13-F is electrically compatible with identical 40V reverse voltage and 3A current rating. Forward voltage is 50mV higher (450mV versus 400mV at 3A), and reverse leakage is slightly elevated (2mA versus 1.5mA at 40V). These differences are within typical Schottky diode manufacturing tolerances. Compatibility depends on circuit design margins. Verify that the application can tolerate the higher forward voltage drop and leakage current.

Q4: Why are 10MQ040NTR and B140-13-F listed as substitutes if they have lower current ratings? These parts are listed as reduced-current alternatives for applications where circuit analysis confirms that current demands do not exceed their respective ratings (1.5A for 10MQ040NTR, 1A for B140-13-F). They maintain the same 40V reverse voltage and DO-214AC package. Selection of these parts requires verification that application current does not exceed the substitute part's rating.

Q5: What is the significance of the DO-214AC package designation? DO-214AC is the industry standard package designation for surface mount Schottky diodes in SMA form factor. All listed parts use this package, ensuring mechanical and thermal compatibility. The package provides standardized PCB footprint, soldering characteristics, and thermal performance.

Q6: Are there temperature range differences between substitute parts? Yes. The main part CDBA340LL-G specifies 125°C maximum junction temperature. CDBA340L-G and B340LA-13-F specify -55°C to 125°C operating range. The 10MQ040NTR extends to -55°C to 150°C, and B140-13-F extends to -65°C to 150°C. Applications requiring operation below 0°C or above 125°C must select parts with appropriate temperature ratings.

Q7: What is the impact of RoHS compliance on part selection? CDBA340L-G, B340LA-13-F, and B140-13-F are ROHS3 compliant. The 10MQ040NTR is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements, ROHS3 compliant parts are mandatory. The main part CDBA340LL-G does not specify RoHS status.

Q8: How do forward voltage differences affect circuit performance? Forward voltage drop directly impacts power dissipation and voltage regulation. The main part specifies 400mV at 3A. B340LA-13-F specifies 450mV at 3A (50mV higher). In high-current applications, this 50mV difference results in proportionally higher power dissipation. Circuit analysis must confirm that thermal design and voltage regulation margins accommodate the higher forward voltage of substitute parts.

Q9: What does "Fast Recovery ≤ 500ns, > 200mA (Io)" mean? This specification indicates that the diode exhibits fast recovery characteristics with recovery time not exceeding 500 nanoseconds when switching from forward to reverse bias at currents greater than 200mA. This parameter is critical for high-frequency switching applications. All listed parts meet this specification.

Q10: Can parts be mixed in the same circuit design? No. Circuit design must specify a single part number for each diode position. Mixing different substitute parts in parallel or series configurations is not recommended without detailed circuit analysis, as differences in forward voltage, leakage current, and temperature coefficients can result in unequal current distribution and thermal stress.

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