B140-M3/5AT Equivalent & Substitute Parts

Part Overview

The B140-M3/5AT is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 40 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as Active and complies with ROHS3 and REACH requirements. Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when enhanced electrical characteristics are needed for specific circuit applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	520 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	200	µA @ 40 V
Technology	Schottky	—
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the B140-M3/5AT is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 40 V minimum
Current - Average Rectified (Io): 1 A minimum
Technology: Schottky
Mounting Type: Surface Mount
Package / Case: DO-214AC (SMA) or compatible surface mount package

Secondary Compatibility Factors:

Forward voltage (Vf) at rated current
Reverse leakage current
Operating temperature range
RoHS and REACH compliance status
Product status (Active preferred; Not For New Designs acceptable for legacy applications)

Substitute parts are grouped into three categories:

Direct Electrical Equivalents (40 V, 1 A): Parts with identical voltage and current ratings in standard SMA packaging
Enhanced Current Ratings (40 V, >1 A): Parts with higher current capacity, suitable for applications with margin requirements
Higher Voltage Ratings (>40 V, 1 A): Parts with elevated voltage ratings, applicable in circuits with higher reverse voltage stress

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Package	Product Status	RoHS
B140-M3/5AT	Vishay	40	1	520 @ 1A	200 @ 40V	DO-214AC (SMA)	Active	ROHS3
B140-13-F	Diodes Inc.	40	1	500 @ 1A	500 @ 40V	DO-214AC (SMA)	Active	ROHS3
B140Q-13-F	Diodes Inc.	40	1	500 @ 1A	500 @ 40V	DO-214AC (SMA)	Active	ROHS3
B150-13-F	Diodes Inc.	50	1	700 @ 1A	500 @ 50V	DO-214AC (SMA)	Active	ROHS3
B150Q-13-F	Diodes Inc.	50	1	700 @ 1A	500 @ 40V	DO-214AC (SMA)	Active	ROHS3
CDBA140SL-HF	Comchip	40	1.4	330 @ 1A	1000 @ 40V	DO-214AC (SMA)	Active	ROHS3
CDBM140-G	Comchip	40	1	500 @ 1A	500 @ 40V	SOD-123T	Active	ROHS3
CMSH2-40M TR13 PBFREE	Central Semiconductor	40	2	550 @ 2A	500 @ 40V	DO-214AC (SMA)	Active	ROHS3
MBRA140T3G	onsemi	40	1	550 @ 1A	500 @ 40V	DO-214AC (SMA)	Active	ROHS3
RB160L-40TE25	Rohm	40	1	550 @ 1A	100 @ 40V	DO-214AC (SMA)	Not For New Designs	ROHS3
RB162L-40TE25	Rohm	40	1	550 @ 1A	500 @ 40V	DO-214AC (SMA)	Not For New Designs	ROHS3

Engineering Selection Recommendations

For Direct Replacement (40 V, 1 A, Active Status):

The B140-13-F and B140Q-13-F from Diodes Incorporated are primary equivalents. Both maintain the 40 V / 1 A electrical specification and DO-214AC (SMA) package format. The B140Q-13-F carries AEC-Q101 automotive qualification, making it suitable for automotive and high-reliability applications. Forward voltage is improved at 500 mV versus the original 520 mV specification.

The MBRA140T3G from onsemi provides equivalent electrical performance with identical voltage and current ratings. This part is Active status and maintains full compliance with ROHS3 and REACH requirements.

For Enhanced Current Margin (40 V, >1 A, Active Status):

The CDBA140SL-HF from Comchip Technology offers 1.4 A current rating at 40 V with superior forward voltage characteristics (330 mV @ 1 A). This part is suitable for applications requiring additional current headroom while maintaining the same voltage specification and package format.

The CMSH2-40M TR13 PBFREE from Central Semiconductor Corp provides 2 A current capacity at 40 V in the standard DO-214AC (SMA) package. This part accommodates applications with higher current demands or thermal margin requirements.

For Compact Packaging (40 V, 1 A, Active Status):

The CDBM140-G from Comchip Technology provides equivalent electrical performance in a SOD-123T (Mini SMA) package. This option is applicable for space-constrained designs requiring reduced footprint.

For Higher Voltage Applications (50 V, 1 A, Active Status):

The B150-13-F and B150Q-13-F from Diodes Incorporated provide 50 V reverse voltage rating at 1 A current. These parts are suitable for circuits with elevated reverse voltage stress. The B150Q-13-F includes AEC-Q101 automotive qualification. Forward voltage increases to 700 mV at rated current due to the higher voltage rating.

Legacy Applications (Not For New Designs):

The RB160L-40TE25 and RB162L-40TE25 from Rohm Semiconductor maintain 40 V / 1 A specifications but carry "Not For New Designs" status. These parts are acceptable for sustaining existing production or legacy system support only. The RB160L-40TE25 exhibits lower reverse leakage (100 µA @ 40 V) compared to the original specification.

Frequently Asked Questions (FAQ)

Q: Can B140-13-F directly replace B140-M3/5AT in existing designs?

A: Yes. Both parts maintain 40 V reverse voltage and 1 A average rectified current specifications in DO-214AC (SMA) packages. The B140-13-F exhibits lower forward voltage (500 mV versus 520 mV at 1 A), which is a favorable characteristic. Electrical compatibility is confirmed across all critical parameters.

Q: What is the difference between B140Q-13-F and B140-13-F?

A: Both parts are electrically identical at 40 V / 1 A with identical forward voltage and package specifications. The B140Q-13-F carries AEC-Q101 automotive qualification and is designated for automotive and high-reliability applications. Selection depends on application requirements for automotive-grade certification.

Q: Can higher voltage parts like B150-13-F be used in place of B140-M3/5AT?

A: Yes, with circuit design consideration. The B150-13-F provides 50 V reverse voltage rating, which is compatible with 40 V applications. However, forward voltage increases to 700 mV at 1 A due to the higher voltage rating. This affects power dissipation and circuit performance. Use B150-13-F only when the higher voltage rating provides design margin or when 40 V equivalents are unavailable.

Q: Is CDBM140-G compatible with B140-M3/5AT?

A: Electrically yes, but with package format difference. The CDBM140-G provides identical 40 V / 1 A electrical specifications but uses SOD-123T (Mini SMA) package instead of DO-214AC (SMA). This part is suitable only for designs that accommodate the smaller footprint or when space constraints require compact packaging.

Q: Can CDBA140SL-HF be used as a direct replacement?

A: Yes, with enhanced current capability. The CDBA140SL-HF maintains 40 V reverse voltage and DO-214AC (SMA) package compatibility but provides 1.4 A current rating. Forward voltage is superior at 330 mV @ 1 A. This part is suitable for applications requiring additional current margin or thermal headroom. No circuit redesign is required for electrical compatibility.

Q: What is the significance of "Not For New Designs" status on Rohm parts?

A: Parts marked "Not For New Designs" (RB160L-40TE25, RB162L-40TE25) are acceptable for sustaining existing production runs or legacy system support but should not be selected for new circuit designs. Active status alternatives from Diodes Incorporated, Comchip, onsemi, or Central Semiconductor are preferred for new designs to ensure long-term availability and manufacturer support.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant status and REACH Unaffected designation, matching the compliance profile of the B140-M3/5AT. All parts are suitable for applications with environmental and regulatory compliance requirements.

Q: How does reverse leakage current affect part selection?

A: Reverse leakage current varies across substitute parts (100 µA to 1000 µA @ rated voltage). Lower leakage is preferable for low-power or precision applications. The original B140-M3/5AT specifies 200 µA @ 40 V. The RB160L-40TE25 offers lower leakage at 100 µA, while CDBA140SL-HF exhibits higher leakage at 1000 µA. Select based on circuit requirements for leakage performance.

Q: Can CMSH2-40M TR13 PBFREE be used in all B140-M3/5AT applications?

A: Yes, with thermal design consideration. The CMSH2-40M provides 2 A current rating at 40 V, exceeding the 1 A requirement. This part is suitable for all B140-M3/5AT applications and provides additional current margin. The higher current rating does not create compatibility issues in circuits designed for 1 A operation.

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