B240A-M3/5AT Equivalent & Substitute Parts

Part Overview

The B240A-M3/5AT is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 40 V DC reverse voltage and 2 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and packaging format preferences while maintaining electrical and mechanical compatibility within the specified parameter ranges.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 2 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the B240A-M3/5AT are grouped based on strict electrical and mechanical parameter alignment. The primary substitution criteria are:

Electrical Parameters:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 2 A
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: 500 µA @ 40 V

Mechanical Parameters:

Mounting Type: Surface Mount
Package / Case: DO-214AC, SMA
Operating Temperature - Junction: -65°C to 150°C (or compatible range)

Compliance Parameters:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Parametric equivalents from Vishay maintain identical electrical specifications and differ only in packaging format (Cut Tape vs. Tape & Reel). Manufacturer-recommended substitutes from Diodes Incorporated, Comchip Technology, and STMicroelectronics meet the core electrical requirements with minor variations in forward voltage or reverse leakage characteristics that remain within acceptable operating margins. Parts with reduced current ratings (1 A vs. 2 A) are listed as alternatives for applications with lower current requirements but are not direct equivalents.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Package	Packaging Format	Tj (Max) [°C]	RoHS Status
B240A-M3/5AT	Vishay	40	2	550 @ 2A	500 @ 40V	DO-214AC (SMA)	Tape & Reel (TR)	150	ROHS3
B240A-E3/5AT	Vishay	40	2	550 @ 2A	500 @ 40V	DO-214AC (SMA)	Cut Tape (CT) & Digi-Reel®	150	ROHS3
B240A-E3/61T	Vishay	40	2	550 @ 2A	500 @ 40V	DO-214AC (SMA)	Cut Tape (CT) & Digi-Reel®	150	ROHS3
B240A-M3/61T	Vishay	40	2	550 @ 2A	500 @ 40V	DO-214AC (SMA)	Tape & Reel (TR)	150	ROHS3
B240A-13-F	Diodes Incorporated	40	2	500 @ 2A	500 @ 40V	DO-214AC (SMA)	Cut Tape (CT) & Digi-Reel®	150	ROHS3
B240AQ-13-F	Diodes Incorporated	40	2	500 @ 2A	500 @ 40V	DO-214AC (SMA)	Tape & Reel (TR)	150	ROHS3
CDBA240-G	Comchip Technology	40	2	500 @ 2A	500 @ 40V	DO-214AC (SMA)	Tape & Reel (TR)	125	ROHS3
B140-13-F	Diodes Incorporated	40	1	500 @ 1A	500 @ 40V	DO-214AC (SMA)	Cut Tape (CT) & Digi-Reel®	150	ROHS3
STPS140A	STMicroelectronics	40	1	550 @ 1A	12 @ 40V	DO-214AC (SMA)	Cut Tape (CT) & Digi-Reel®	150	ROHS3
STPS140AY	STMicroelectronics	40	1	650 @ 2A	12 @ 40V	DO-214AC (SMA)	Cut Tape (CT) & Digi-Reel®	150	ROHS3
CDBM240-G	Comchip Technology	40	2	500 @ 2A	500 @ 40V	SOD-123T (Mini SMA)	Tape & Reel (TR)	125	ROHS3

Engineering Selection Recommendations

Parametric Equivalents (Vishay B240A Series): B240A-E3/5AT, B240A-E3/61T, and B240A-M3/61T are parametric equivalents to the B240A-M3/5AT. These parts maintain identical electrical specifications and differ only in packaging format (Cut Tape vs. Tape & Reel). Selection between these variants depends on assembly process requirements and supply chain logistics. All are Active product status and ROHS3 compliant.

Direct Electrical Equivalents (2 A, 40 V): B240A-13-F (Diodes Incorporated) and B240AQ-13-F (Diodes Incorporated) provide 2 A rated current at 40 V with forward voltage of 500 mV @ 2 A, which is 50 mV lower than the B240A-M3/5AT. CDBA240-G (Comchip Technology) offers identical electrical performance with maximum junction temperature of 125°C. All three are Active product status and ROHS3 compliant.

Reduced Current Alternatives (1 A, 40 V): B140-13-F (Diodes Incorporated), STPS140A, and STPS140AY (STMicroelectronics) are rated for 1 A average rectified current. These parts are suitable only for applications with current requirements not exceeding 1 A. STPS140A exhibits lower reverse leakage (12 µA @ 40 V) compared to the main part (500 µA @ 40 V). STPS140AY includes automotive qualification (AEC-Q101).

Package Variant (Mini SMA/SOD-123): CDBM240-G (Comchip Technology) maintains 2 A current rating and 40 V voltage rating but uses SOD-123T (Mini SMA) package instead of standard DO-214AC (SMA). This variant is suitable only for designs with Mini SMA footprint compatibility. Maximum junction temperature is 125°C.

Frequently Asked Questions (FAQ)

Q: Can B240A-E3/5AT be used as a direct replacement for B240A-M3/5AT?

A: Yes. B240A-E3/5AT is a parametric equivalent with identical electrical specifications. The difference is packaging format: B240A-M3/5AT is supplied in Tape & Reel (TR) format, while B240A-E3/5AT is supplied in Cut Tape (CT) & Digi-Reel® format. Selection depends on assembly equipment compatibility and supply chain requirements.

Q: What is the difference between B240A-13-F and B240AQ-13-F?

A: Both are manufactured by Diodes Incorporated with identical electrical specifications (40 V, 2 A, 500 mV forward voltage @ 2 A). The primary difference is packaging format: B240A-13-F is supplied in Cut Tape (CT) & Digi-Reel®, while B240AQ-13-F is supplied in Tape & Reel (TR). B240AQ-13-F is also listed as Manufacturer Recommended and carries automotive qualification.

Q: Can STPS140A replace B240A-M3/5AT in a 2 A application?

A: No. STPS140A is rated for 1 A average rectified current, while B240A-M3/5AT is rated for 2 A. Using STPS140A in a 2 A application would exceed its current rating. STPS140A is suitable only for applications with maximum current of 1 A.

Q: What is the impact of forward voltage differences between substitutes?

A: B240A-M3/5AT has forward voltage of 550 mV @ 2 A. Substitutes B240A-13-F, B240AQ-13-F, and CDBA240-G have forward voltage of 500 mV @ 2 A, which is 50 mV lower. This difference affects power dissipation and thermal performance. Lower forward voltage results in reduced power loss. Designs must verify that thermal and power budget requirements are met with the selected substitute.

Q: Is CDBM240-G compatible with B240A-M3/5AT?

A: CDBM240-G is electrically equivalent (40 V, 2 A, 500 mV forward voltage @ 2 A) but uses a different package: SOD-123T (Mini SMA) instead of DO-214AC (SMA). It is compatible only if the PCB footprint supports Mini SMA package. Additionally, maximum junction temperature is 125°C versus 150°C for B240A-M3/5AT.

Q: What does ROHS3 compliance mean for these parts?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive 3 requirements, restricting the use of specific hazardous materials including lead, cadmium, mercury, and certain flame retardants. All listed substitutes are ROHS3 compliant, ensuring regulatory compatibility for applications subject to ROHS requirements.

Q: Are there automotive-qualified alternatives to B240A-M3/5AT?

A: B240AQ-13-F (Diodes Incorporated) is listed as Manufacturer Recommended and carries automotive qualification. STPS140AY (STMicroelectronics) includes automotive grade designation and AEC-Q101 qualification but is rated for 1 A current only. For 2 A automotive applications, B240AQ-13-F is the qualified option.

Q: What is the difference between reverse leakage specifications?

A: B240A-M3/5AT specifies 500 µA reverse leakage @ 40 V. STPS140A and STPS140AY specify 12 µA @ 40 V, which is significantly lower. Lower reverse leakage reduces standby power consumption and improves circuit performance in low-power applications. However, this difference does not affect direct substitution compatibility for standard rectifier applications.

Q: Can packaging format differences affect assembly?

A: Yes. Tape & Reel (TR) format is optimized for high-volume automated assembly with reel-fed pick-and-place equipment. Cut Tape (CT) & Digi-Reel® format is suitable for lower-volume production or mixed-component assembly. Selection must align with available assembly equipment and production volume requirements.

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