MBRS340 Equivalent & Substitute Parts

Part Overview

The MBRS340 is a Schottky rectifier diode rated for 40 V DC reverse voltage and 4 A average rectified current in a Surface Mount SMC (DO-214AB) package. This component is classified as Obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. Active alternatives with comparable electrical characteristics and mechanical compatibility are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	4	A
Voltage - Forward (Vf) (Max) @ If	525 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	2	mA @ 40 V
Technology	Schottky	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-65°C ~ 125°C	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MBRS340 is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a DC reverse voltage rating of 40 V to ensure safe operation within the same circuit topology.

Current Rating: The original part is rated for 4 A average rectified current. Substitute parts with equal or higher current ratings (3 A, 4 A, or 5 A) are acceptable, as they provide equivalent or superior current handling capability.

Package Type: The MBRS340 uses the DO-214AB (SMC) surface mount package. Substitutes in the same package maintain mechanical and thermal compatibility with existing PCB layouts. Parts in alternative packages (DO-214AA/SMB, DO-214AC/SMA) require PCB redesign and are classified as similar alternatives rather than direct substitutes.

Technology: All substitute parts employ Schottky diode technology, maintaining identical switching characteristics and forward voltage behavior.

Speed Characteristics: Fast recovery time (≤ 500ns, > 200mA) is consistent across all alternatives, ensuring equivalent transient response.

Compliance: RoHS3 compliance and MSL 1 rating are maintained across all substitute options.

Substitute parts are organized into two categories:

Direct Substitutes (DO-214AB/SMC Package): MBRS340T3G, 30BQ040, CMSH3-40 TR13 PBFREE, B340-13-F, B340Q-13-F, B540C-13-F, B540CQ-13-F

Similar Alternatives (Alternative Packages): B340B-13-F (DO-214AA/SMB), B340LA-13-F (DO-214AC/SMA), B340LB-13-F (DO-214AA/SMB)

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Ir @ Vr [mA]	Package	Tj (°C)	Product Status
MBRS340	onsemi	40	4	525 @ 3 A	2 @ 40 V	DO-214AB, SMC	-65 ~ 125	Obsolete
MBRS340T3G	onsemi	40	3	500 @ 3 A	2 @ 40 V	DO-214AB, SMC	-65 ~ 150	Active
30BQ040	SMC Diode Solutions	40	—	680 @ 3 A	500 µA @ 40 V	DO-214AB, SMC	-55 ~ 150	Active
CMSH3-40 TR13 PBFREE	Central Semiconductor Corp	40	3	500 @ 3 A	500 µA @ 40 V	DO-214AB, SMC	-65 ~ 150	Active
B340-13-F	Diodes Incorporated	40	3	500 @ 3 A	500 µA @ 40 V	DO-214AB, SMC	-55 ~ 125	Active
B340B-13-F	Diodes Incorporated	40	3	500 @ 3 A	500 µA @ 40 V	DO-214AA, SMB	-55 ~ 150	Active
B340LA-13-F	Diodes Incorporated	40	3	450 @ 3 A	2 @ 40 V	DO-214AC, SMA	-55 ~ 125	Active
B340LB-13-F	Diodes Incorporated	40	3	450 @ 3 A	2 @ 40 V	DO-214AA, SMB	-55 ~ 125	Active
B340Q-13-F	Diodes Incorporated	40	3	500 @ 3 A	500 µA @ 40 V	DO-214AB, SMC	-55 ~ 150	Active
B540C-13-F	Diodes Incorporated	40	5	550 @ 5 A	500 µA @ 40 V	DO-214AB, SMC	-55 ~ 150	Active
B540CQ-13-F	Diodes Incorporated	40	5	550 @ 5 A	500 µA @ 40 V	DO-214AB, SMC	-55 ~ 150	Active

Engineering Selection Recommendations

Direct Substitutes (Recommended for Drop-In Replacement):

MBRS340T3G (onsemi) is the primary direct substitute. It maintains the DO-214AB/SMC package, 40 V voltage rating, and fast recovery characteristics. The 3 A current rating is lower than the original 4 A specification but remains within acceptable substitution parameters for applications not requiring the full 4 A capacity. Product status is Active with extended junction temperature range (-65°C ~ 150°C).

CMSH3-40 TR13 PBFREE (Central Semiconductor Corp) provides equivalent electrical performance with identical voltage and current ratings to MBRS340T3G. It maintains DO-214AB/SMC package compatibility and Active product status. Tape & Reel packaging is suitable for automated assembly processes.

B340Q-13-F (Diodes Incorporated) offers DO-214AB/SMC package compatibility with 3 A current rating and Active product status. AEC-Q101 automotive qualification is included, providing additional reliability assurance for applications requiring automotive-grade components.

Higher Current Alternatives (DO-214AB/SMC Package):

B540C-13-F and B540CQ-13-F (Diodes Incorporated) provide 5 A current rating in the same DO-214AB/SMC package, offering increased current capacity for applications requiring higher rectified current. Both maintain 40 V voltage rating and Active product status. B540CQ-13-F includes AEC-Q101 automotive qualification and Tape & Reel packaging.

Alternative Package Options (Require PCB Redesign):

B340LA-13-F (Diodes Incorporated) uses DO-214AC/SMA package with improved forward voltage characteristics (450 mV @ 3 A) compared to the original specification. This option requires PCB layout modification.

B340B-13-F and B340LB-13-F (Diodes Incorporated) use DO-214AA/SMB package. B340B-13-F includes AEC-Q101 automotive qualification. Both require PCB redesign for mechanical compatibility.

Compliance Considerations:

All substitute parts maintain RoHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage requirements. REACH status varies; 30BQ040 is REACH Affected, while all other alternatives are REACH Unaffected.

Frequently Asked Questions (FAQ)

Q: Can MBRS340T3G be used as a direct replacement for MBRS340?

A: MBRS340T3G is a direct substitute in terms of package (DO-214AB/SMC) and voltage rating (40 V). The current rating is reduced from 4 A to 3 A. This substitution is valid for applications where the circuit current requirement does not exceed 3 A. Both parts share identical fast recovery characteristics and RoHS3 compliance.

Q: What is the difference between DO-214AB (SMC), DO-214AA (SMB), and DO-214AC (SMA) packages?

A: These are distinct surface mount package outlines with different physical dimensions and thermal characteristics. DO-214AB (SMC) is the original package for MBRS340. DO-214AA (SMB) and DO-214AC (SMA) are smaller packages requiring PCB redesign. Package selection affects PCB layout, thermal dissipation, and assembly compatibility.

Q: Are B540C-13-F and B540CQ-13-F suitable replacements for MBRS340?

A: Both parts maintain the DO-214AB/SMC package and 40 V voltage rating. The 5 A current rating exceeds the original 4 A specification, providing increased capacity. These parts are suitable for applications requiring equal or higher current handling. B540CQ-13-F includes AEC-Q101 automotive qualification and Tape & Reel packaging for automated assembly.

Q: What does AEC-Q101 qualification indicate?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts bearing this qualification (B340B-13-F, B340Q-13-F, B540CQ-13-F) have undergone additional reliability testing and are suitable for automotive applications. This qualification is optional for non-automotive applications.

Q: How do forward voltage specifications affect substitution?

A: Forward voltage (Vf) varies among substitute parts. MBRS340 specifies 525 mV @ 3 A, while alternatives range from 450 mV to 680 mV @ 3 A. Lower forward voltage reduces power dissipation and heat generation. Higher forward voltage increases dissipation. Selection depends on circuit thermal design and efficiency requirements. All values remain within acceptable Schottky diode operating ranges.

Q: What is the significance of reverse leakage current differences?

A: MBRS340 specifies 2 mA @ 40 V reverse leakage, while some alternatives specify 500 µA @ 40 V. Lower leakage current reduces standby power consumption and improves circuit efficiency. Higher leakage current increases standby power but remains acceptable for most applications. Selection depends on circuit standby power requirements.

Q: Can 30BQ040 be used as a substitute despite missing current rating specification?

A: 30BQ040 maintains 40 V voltage rating and DO-214AB/SMC package compatibility. The current rating is not specified in available data. This part is suitable for applications where the circuit current requirement is known to be within acceptable limits for a 40 V Schottky diode in SMC package. Verification against manufacturer datasheets is necessary for current capacity confirmation.

Q: What packaging options are available for automated assembly?

A: Cut Tape (CT) & Digi-Reel® packaging is available for MBRS340T3G, 30BQ040, B340-13-F, B340B-13-F, B340LA-13-F, B340LB-13-F, and B540C-13-F. Tape & Reel (TR) packaging is available for CMSH3-40 TR13 PBFREE, B340Q-13-F, and B540CQ-13-F. Tape & Reel format is optimized for high-speed automated pick-and-place assembly.

Q: How do operating temperature ranges affect part selection?

A: MBRS340 operates from -65°C to 125°C. Most active substitutes extend the upper limit to 150°C, providing improved thermal margin. B340-13-F and B340LA-13-F maintain the 125°C upper limit. Selection depends on application operating environment and thermal design requirements.

Q: Is REACH compliance a critical factor for substitution?

A: REACH compliance status indicates regulatory compliance for chemical substance restrictions in the European Union. Most substitutes are REACH Unaffected. 30BQ040 is REACH Affected, requiring additional documentation for EU applications. For non-EU applications, REACH status is not a limiting factor.

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