MBRS140 Equivalent & Substitute Parts

Part Overview

The MBRS140 is a Schottky rectifier diode rated for 40 V DC reverse voltage and 1 A average rectified current in a DO-214AA (SMB) surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The MBRS140 serves in applications requiring fast recovery rectification with low forward voltage drop characteristics typical of Schottky technology.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	1 A
Voltage - Forward (Vf) (Max) @ If	600 mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	1 mA @ 40 V
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature - Junction	-65°C ~ 125°C
Technology	Schottky

Substitute Part Grouping Explanation

Substitution for the MBRS140 is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

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

Substitution Categories:

Direct Manufacturer Equivalents maintain identical electrical specifications and are produced by the original manufacturer (onsemi) with active product status. These include MBRS140T3G and SBRS8140NT3G, which provide pin-for-pin and functional compatibility.

Parametric Equivalents from onsemi (SBRS8140T3G-VF01) meet all core electrical parameters while offering automotive-grade qualification (AEC-Q101), suitable for applications requiring enhanced reliability.

Cross-Manufacturer Equivalents from Diodes Incorporated (B140B-13-F, B140BQ-13-F, B140HB-13-F) and SMC Diode Solutions (10BQ040) satisfy the 40 V / 1 A Schottky rectifier specification with minor variations in forward voltage and leakage characteristics within acceptable engineering tolerances.

Similar Alternatives including Microchip Technology 5819SMJ/TR13 and Diodes Incorporated B240-13-F series provide functional substitution with noted parameter deviations documented in the comparison table.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vr (Max)	Io	Vf (Max) @ If	Ir @ Vr	Package	Temp Range	RoHS
MBRS140	onsemi	Obsolete	40 V	1 A	600 mV @ 1 A	1 mA @ 40 V	DO-214AA, SMB	-65°C ~ 125°C	ROHS3
MBRS140T3G	onsemi	Active	40 V	1 A	600 mV @ 1 A	1 mA @ 40 V	DO-214AA, SMB	-65°C ~ 125°C	ROHS3
SBRS8140NT3G	onsemi	Active	40 V	1 A	600 mV @ 1 A	1 mA @ 40 V	DO-214AA, SMB	-65°C ~ 125°C	ROHS3
SBRS8140T3G-VF01	onsemi	Active	40 V	1 A	600 mV @ 1 A	1 mA @ 40 V	DO-214AA, SMB	-65°C ~ 125°C	ROHS3
10BQ040	SMC Diode Solutions	Active	40 V	1 A	700 mV @ 2 A	1 mA @ 40 V	DO-214AA, SMB	-55°C ~ 150°C	ROHS3
5819SMJ/TR13	Microchip Technology	Active	40 V	1 A	550 mV @ 1 A	1 mA @ 40 V	DO-214AA, SMB	-55°C ~ 150°C	Non-compliant
B140B-13-F	Diodes Incorporated	Active	40 V	1 A	500 mV @ 1 A	500 µA @ 40 V	DO-214AA, SMB	-65°C ~ 150°C	ROHS3
B140BQ-13-F	Diodes Incorporated	Active	40 V	1 A	500 mV @ 1 A	500 µA @ 40 V	DO-214AA, SMB	-65°C ~ 150°C	ROHS3
B140HB-13-F	Diodes Incorporated	Active	40 V	1 A	530 mV @ 1 A	100 µA @ 40 V	DO-214AA, SMB	-55°C ~ 150°C	ROHS3
B240-13-F	Diodes Incorporated	Active	40 V	2 A	500 mV @ 2 A	500 µA @ 40 V	DO-214AA, SMB	-65°C ~ 150°C	ROHS3
B240A-13-F	Diodes Incorporated	Active	40 V	2 A	500 mV @ 2 A	500 µA @ 40 V	DO-214AC, SMA	-65°C ~ 150°C	ROHS3

Engineering Selection Recommendations

First Priority - Direct Equivalents:

MBRS140T3G from onsemi is the primary replacement for the obsolete MBRS140. This part maintains identical electrical specifications and is produced by the original manufacturer with active product status. It is ROHS3 compliant and carries unlimited moisture sensitivity rating (MSL 1).

Second Priority - Automotive-Qualified Alternatives:

SBRS8140NT3G and SBRS8140T3G-VF01 from onsemi provide equivalent electrical performance with AEC-Q101 automotive qualification. These parts are suitable for applications requiring enhanced reliability and automotive-grade traceability while maintaining the same 40 V / 1 A specification.

Third Priority - Cross-Manufacturer Equivalents:

B140B-13-F, B140BQ-13-F, and B140HB-13-F from Diodes Incorporated satisfy the core 40 V / 1 A Schottky rectifier requirement. B140BQ-13-F includes AEC-Q101 qualification for automotive applications. All three are ROHS3 compliant. Forward voltage characteristics range from 500 mV to 530 mV at 1 A, representing acceptable variation within Schottky diode performance bands.

Fourth Priority - Extended Temperature Range:

10BQ040 from SMC Diode Solutions extends the operating temperature range to -55°C ~ 150°C compared to the MBRS140's -65°C ~ 125°C. This part is suitable for applications requiring higher temperature operation within the 40 V / 1 A specification.

Compatibility Considerations:

All recommended substitutes maintain the DO-214AA (SMB) surface mount package and are pin-for-pin compatible with the MBRS140. B240-13-F and B240A-13-F are rated for 2 A operation and represent upgrades for applications requiring higher current capacity at the same 40 V reverse voltage rating. B240A-13-F uses the DO-214AC (SMA) package and is not pin-for-pin compatible with the MBRS140.

Frequently Asked Questions (FAQ)

Q: Can MBRS140T3G be used as a direct replacement for the obsolete MBRS140?

A: Yes. MBRS140T3G is produced by onsemi and maintains identical electrical specifications: 40 V reverse voltage, 1 A average rectified current, 600 mV forward voltage at 1 A, and fast recovery characteristics. Both use the DO-214AA (SMB) package. The primary difference is product status: MBRS140T3G is active while MBRS140 is obsolete.

Q: What is the difference between SBRS8140NT3G and MBRS140T3G?

A: Both parts meet the same electrical specifications (40 V / 1 A Schottky rectifier). SBRS8140NT3G carries AEC-Q101 automotive qualification and is supplied in Tape & Reel packaging, while MBRS140T3G is supplied in Cut Tape & Digi-Reel packaging. SBRS8140NT3G is specified for automotive applications requiring enhanced reliability documentation.

Q: Are Diodes Incorporated B140 series parts compatible with the MBRS140?

A: Yes. B140B-13-F, B140BQ-13-F, and B140HB-13-F all meet the 40 V / 1 A specification and use the DO-214AA (SMB) package. Forward voltage characteristics differ slightly (500 mV to 530 mV at 1 A versus 600 mV for MBRS140), representing normal Schottky diode performance variation. B140BQ-13-F includes AEC-Q101 automotive qualification.

Q: Why is the forward voltage different between substitute parts?

A: Forward voltage variation is inherent to Schottky diode manufacturing. The MBRS140 specifies 600 mV maximum at 1 A. Substitute parts from Diodes Incorporated (B140 series) specify 500 mV to 530 mV at 1 A, representing tighter manufacturing control or different silicon junction designs. All values remain within acceptable Schottky rectifier performance bands for 40 V / 1 A applications.

Q: Can B240-13-F replace the MBRS140 in my circuit?

A: B240-13-F is rated for 2 A average rectified current versus 1 A for the MBRS140, making it a higher-capacity upgrade. It maintains the same 40 V reverse voltage rating and DO-214AA (SMB) package. This part is suitable if your circuit can accommodate the higher current rating. Verify that the 2 A rating does not introduce thermal or circuit design complications.

Q: Is B240A-13-F compatible with the MBRS140?

A: B240A-13-F uses the DO-214AC (SMA) package instead of the DO-214AA (SMB) package used by MBRS140. This package difference means B240A-13-F is not pin-for-pin compatible and requires PCB layout modification. It is rated for 2 A operation at 40 V, representing a higher-capacity alternative if package change is acceptable.

Q: What is the significance of RoHS compliance in substitute selection?

A: The MBRS140 and most recommended substitutes are ROHS3 compliant, indicating lead-free construction and compliance with hazardous substance restrictions. The Microchip 5819SMJ/TR13 is RoHS non-compliant and should be avoided in applications requiring RoHS certification or regulatory compliance.

Q: Does operating temperature range affect substitution?

A: The MBRS140 operates from -65°C to 125°C. Most substitutes extend this range to -55°C ~ 150°C or -65°C ~ 150°C, providing broader temperature coverage. If your application operates within the MBRS140's original range, any substitute with equal or extended range is acceptable. For applications requiring the full -65°C lower limit, verify the substitute's minimum temperature specification.

Q: What packaging options are available for substitutes?

A: All recommended 1 A substitutes use the DO-214AA (SMB) surface mount package, maintaining mechanical compatibility with the MBRS140. Packaging variants include Cut Tape (CT) & Digi-Reel, Tape & Reel (TR), and bulk options. Select based on procurement volume and assembly process requirements. B240A-13-F uses the DO-214AC (SMA) package and requires different PCB footprint.

Q: Are there automotive-qualified alternatives to the MBRS140?

A: Yes. SBRS8140NT3G, SBRS8140T3G-VF01, and B140BQ-13-F all carry AEC-Q101 automotive qualification. These parts are suitable for automotive applications requiring enhanced reliability documentation and traceability. All maintain the 40 V / 1 A specification and DO-214AA (SMB) package.

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