MBRA340T3 Schottky Diode 40V 3A SMA Equivalent & Substitute Parts

Part Overview

The MBRA340T3 is a Schottky rectifier diode manufactured by onsemi, rated for 40V DC reverse voltage and 3A average rectified current in a surface mount SMA (DO-214AC) package. This component is classified as obsolete product status. Due to its obsolete designation, identifying equivalent and substitute parts with active product status is necessary for ongoing design support, procurement continuity, and new production requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for Schottky diode applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	450 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	300	µA @ 40 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the MBRA340T3 is determined by strict equivalence of the following critical parameters:

Primary Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 3 A
Voltage - Forward (Vf) (Max) @ If: 450 mV @ 3 A
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: 300 µA @ 40 V
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Technology: Schottky

Substitute Classification:

Direct Equivalents (Identical Electrical & Mechanical Parameters): Parts that match all primary criteria with active product status and improved compliance certifications.

Parametric Equivalents (Matching Core Electrical Parameters): Parts that maintain 40V/3A ratings and fast recovery characteristics with identical package, but may include automotive-grade qualifications (AEC-Q101).

Similar Parts (Functional Alternatives): Parts that share 40V reverse voltage and SMA package but differ in forward voltage, leakage current, or current rating. These require application-level verification for compatibility.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ If	Ir @ Vr	Package	Product Status	RoHS Status
MBRA340T3	onsemi	40 V	3 A	450 mV @ 3 A	300 µA @ 40 V	DO-214AC, SMA	Obsolete	Non-compliant
MBRA340T3G	onsemi	40 V	3 A	450 mV @ 3 A	300 µA @ 40 V	DO-214AC, SMA	Active	ROHS3 Compliant
NRVBA340NT3G	onsemi	40 V	3 A	450 mV @ 3 A	300 µA @ 40 V	DO-214AC, SMA	Active	ROHS3 Compliant
NRVBA340T3G-VF01	onsemi	40 V	3 A	450 mV @ 3 A	300 µA @ 40 V	DO-214AC, SMA	Active	ROHS3 Compliant
B340A-13-F	Diodes Incorporated	40 V	3 A	500 mV @ 3 A	500 µA @ 40 V	DO-214AC, SMA	Active	ROHS3 Compliant
B340A-E3/61T	Vishay	40 V	3 A	550 mV @ 3 A	500 µA @ 40 V	DO-214AC, SMA	Active	ROHS3 Compliant
B340LA-13-F	Diodes Incorporated	40 V	3 A	450 mV @ 3 A	2 mA @ 40 V	DO-214AC, SMA	Active	ROHS3 Compliant
CDBA340-G	Comchip Technology	40 V	3 A	500 mV @ 3 A	500 µA @ 40 V	DO-214AC, SMA	Active	ROHS3 Compliant
B140-13-F	Diodes Incorporated	40 V	1 A	500 mV @ 1 A	500 µA @ 40 V	DO-214AC, SMA	Active	ROHS3 Compliant
BAT165E6327HTSA1	Infineon Technologies	40 V	750 mA	740 mV @ 750 mA	50 µA @ 40 V	SC-76, SOD-323	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Preferred):

MBRA340T3G and NRVBA340NT3G are direct electrical and mechanical equivalents to the obsolete MBRA340T3. Both parts maintain identical 40V/3A ratings, 450 mV forward voltage drop, and 300 µA reverse leakage current. Both are manufactured by onsemi with active product status and ROHS3 compliance. NRVBA340NT3G includes AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability. NRVBA340T3G-VF01 provides an additional automotive-qualified variant with identical electrical specifications.

Tier 2 - Functional Equivalents (40V/3A Rating Maintained):

B340A-13-F (Diodes Incorporated), B340A-E3/61T (Vishay), and CDBA340-G (Comchip Technology) maintain the 40V/3A core specifications with DO-214AC SMA packaging. These parts exhibit higher forward voltage (500-550 mV @ 3 A) and reverse leakage current (500 µA @ 40 V) compared to the original MBRA340T3. All three are active products with ROHS3 compliance. B340A-13-F includes AEC-Q101 automotive qualification.

Tier 3 - Reduced Current Rating (Not Recommended for Direct Replacement):

B140-13-F is rated for 1A average rectified current, below the 3A requirement of MBRA340T3. This part is suitable only for applications with reduced current demands and should not be used as a direct substitute in 3A-rated circuits.

Tier 4 - Different Package (Not Recommended for Direct Replacement):

BAT165E6327HTSA1 (Infineon Technologies) uses SOD-323 package instead of SMA, with reduced current rating (750 mA). This part is not suitable for direct replacement due to package incompatibility and insufficient current rating.

Compliance Consideration:

The original MBRA340T3 is RoHS non-compliant. All recommended substitute parts are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and production.

Frequently Asked Questions (FAQ)

Q1: Can MBRA340T3G be used as a direct replacement for the obsolete MBRA340T3?

A: Yes. MBRA340T3G is a direct equivalent manufactured by onsemi with identical electrical specifications (40V, 3A, 450 mV forward voltage, 300 µA reverse leakage) and DO-214AC SMA packaging. The primary difference is active product status and ROHS3 compliance. No circuit modifications are required.

Q2: What is the difference between MBRA340T3G and NRVBA340NT3G?

A: Both parts are onsemi-manufactured direct equivalents with identical electrical ratings and SMA packaging. NRVBA340NT3G includes AEC-Q101 automotive qualification and is designated as automotive-grade. Selection depends on application requirements; automotive applications should specify NRVBA340NT3G.

Q3: Can B340A-13-F be substituted for MBRA340T3 in all applications?

A: B340A-13-F maintains the 40V/3A core ratings and SMA package but exhibits higher forward voltage (500 mV vs. 450 mV @ 3 A) and higher reverse leakage current (500 µA vs. 300 µA @ 40 V). Substitution is acceptable in applications where these parameter variations do not affect circuit performance. Thermal and efficiency considerations should be evaluated due to increased forward voltage drop.

Q4: Why is B140-13-F listed as a similar part but not recommended?

A: B140-13-F is rated for 1A average rectified current, which is below the 3A specification of MBRA340T3. This part cannot safely handle 3A continuous current and should not be used as a direct replacement. It is suitable only for lower-current applications.

Q5: Is the SOD-323 package of BAT165E6327HTSA1 compatible with MBRA340T3 SMA footprints?

A: No. BAT165E6327HTSA1 uses SC-76 SOD-323 package, which has different pin spacing and footprint compared to DO-214AC SMA. Additionally, its 750 mA current rating is insufficient for 3A applications. This part is not suitable for direct replacement.

Q6: What compliance certifications should be verified when selecting a substitute?

A: All recommended substitute parts are ROHS3 compliant and REACH unaffected. For automotive applications, AEC-Q101 qualification is specified in NRVBA340NT3G and B340A-13-F. Verify that selected parts meet your application's environmental, regulatory, and quality standards.

Q7: How do forward voltage differences affect circuit performance?

A: Forward voltage drop directly impacts power dissipation and circuit efficiency. MBRA340T3 specifies 450 mV @ 3 A, while alternatives range from 450 mV to 550 mV. Higher forward voltage increases heat generation and reduces efficiency. Applications with tight thermal budgets or high-frequency switching should prioritize parts with lower forward voltage specifications.

Q8: What is the significance of reverse leakage current in diode selection?

A: Reverse leakage current affects circuit standby power consumption and reverse-bias performance. MBRA340T3 specifies 300 µA @ 40 V, while some alternatives specify 500 µA or higher. In low-power or precision applications, lower leakage current is preferred. B340LA-13-F specifies 2 mA leakage, which is significantly higher and may not be suitable for sensitive applications.

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