DSS1-40BA Equivalent & Substitute Parts

Part Overview

The DSS1-40BA is a Schottky diode manufactured by IXYS, rated for 40 V DC reverse voltage and 1 A average rectified current in a DO-214AC (SMA) surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design continuity. The part features fast recovery characteristics with switching speed ≤ 500 ns for currents > 200 mA, suitable for rectification and switching applications requiring low forward voltage drop.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	420 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500 ns, > 200 mA (Io)	ns
Current - Reverse Leakage @ Vr	100	µA @ 40 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Schottky	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the DSS1-40BA is determined by the following critical electrical and mechanical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 40 V
Mounting Type: Surface Mount
Package / Case: DO-214AC, SMA
Technology: Schottky
Speed: Fast Recovery ≤ 500 ns, > 200 mA (Io)

Current Rating Consideration: The DSS1-40BA is rated for 1 A average rectified current. Substitute parts are grouped into two categories:

Direct Equivalents (1 A Rating): Parts with identical 1 A current rating provide pin-for-pin and functional equivalence with no circuit redesign required.
Higher Current Rated Substitutes (2 A and 3 A Ratings): Parts rated for 2 A or 3 A average rectified current meet or exceed the electrical requirements of the original 1 A design. These parts are electrically compatible and can be used in applications where the original 1 A part was specified, as they operate within the same voltage and package constraints while providing additional current capacity margin.

Compliance and Status Considerations: Active product status and RoHS3 compliance are preferred for new designs and ongoing production. Automotive-grade parts with AEC-Q101 qualification are available for applications requiring automotive reliability standards.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Product Status	RoHS Status
DSS1-40BA	IXYS	40 V	1	420 mV @ 1 A	100 µA @ 40 V	DO-214AC (SMA)	Obsolete	—
B140-13-F	Diodes Incorporated	40 V	1	500 mV @ 1 A	500 µA @ 40 V	DO-214AC (SMA)	Active	ROHS3 Compliant
B240A-13-F	Diodes Incorporated	40 V	2	500 mV @ 2 A	500 µA @ 40 V	DO-214AC (SMA)	Active	ROHS3 Compliant
B240A-E3/5AT	Vishay General Semiconductor - Diodes Division	40 V	2	550 mV @ 2 A	500 µA @ 40 V	DO-214AC (SMA)	Active	ROHS3 Compliant
B240A-M3/61T	Vishay General Semiconductor - Diodes Division	40 V	2	550 mV @ 2 A	500 µA @ 40 V	DO-214AC (SMA)	Active	ROHS3 Compliant
B240AQ-13-F	Diodes Incorporated	40 V	2	500 mV @ 2 A	500 µA @ 40 V	DO-214AC (SMA)	Active	ROHS3 Compliant
CDBA240-G	Comchip Technology	40 V	2	500 mV @ 2 A	500 µA @ 40 V	DO-214AC (SMA)	Active	ROHS3 Compliant
RB056L-40TE25	Rohm Semiconductor	40 V	3	670 mV @ 3 A	50 µA @ 40 V	DO-214AC (SMA)	Not For New Designs	ROHS3 Compliant
SS24S-E3/5AT	Vishay General Semiconductor - Diodes Division	40 V	2	550 mV @ 2 A	200 µA @ 40 V	DO-214AC (SMA)	Active	ROHS3 Compliant
SS24S-E3/61T	Vishay General Semiconductor - Diodes Division	40 V	2	550 mV @ 2 A	200 µA @ 40 V	DO-214AC (SMA)	Active	ROHS3 Compliant
SSA24-E3/5AT	Vishay General Semiconductor - Diodes Division	40 V	2	490 mV @ 2 A	200 µA @ 40 V	DO-214AC (SMA)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (1 A Rating):

The B140-13-F from Diodes Incorporated is the primary direct equivalent to the DSS1-40BA. It maintains the 1 A current rating, 40 V reverse voltage, and DO-214AC (SMA) package. The part is active in production status and RoHS3 compliant, making it suitable for new designs and ongoing production. Forward voltage is 500 mV at 1 A, which is 80 mV higher than the original part but remains within acceptable operating parameters for most rectification applications.

Higher Current Rated Substitutes (2 A Rating):

The following 2 A rated parts are electrically compatible substitutes that provide additional current capacity margin:

B240A-13-F (Diodes Incorporated): Active status, RoHS3 compliant, Cut Tape & Digi-Reel packaging
B240AQ-13-F (Diodes Incorporated): Active status, RoHS3 compliant, Automotive grade with AEC-Q101 qualification, Tape & Reel packaging
CDBA240-G (Comchip Technology): Active status, RoHS3 compliant, Tape & Reel packaging
B240A-E3/5AT (Vishay General Semiconductor - Diodes Division): Active status, RoHS3 compliant, Tape & Reel packaging
B240A-M3/61T (Vishay General Semiconductor - Diodes Division): Active status, RoHS3 compliant, Tape & Reel packaging
SSA24-E3/5AT (Vishay General Semiconductor - Diodes Division): Active status, RoHS3 compliant, forward voltage 490 mV at 2 A, Tape & Reel packaging
SS24S-E3/5AT (Vishay General Semiconductor - Diodes Division): Active status, RoHS3 compliant, Tape & Reel packaging
SS24S-E3/61T (Vishay General Semiconductor - Diodes Division): Active status, RoHS3 compliant, Cut Tape packaging

Higher Current Rated Substitute (3 A Rating):

The RB056L-40TE25 from Rohm Semiconductor is rated for 3 A average rectified current. This part is classified as "Not For New Designs" and is therefore not recommended for new product development, though it remains available for legacy system support.

Automotive Applications:

For applications requiring automotive reliability standards, the B240AQ-13-F is qualified to AEC-Q101 and carries automotive grade designation, making it the appropriate choice for automotive rectification circuits.

Frequently Asked Questions (FAQ)

Q: Can I use a 2 A rated diode in place of the 1 A DSS1-40BA?

A: Yes. The 2 A rated substitutes (B240A-13-F, B240AQ-13-F, CDBA240-G, B240A-E3/5AT, B240A-M3/61T, SSA24-E3/5AT, SS24S-E3/5AT, SS24S-E3/61T) are electrically compatible with the DSS1-40BA. They maintain the same 40 V reverse voltage rating and DO-214AC (SMA) package, and provide additional current capacity. No circuit redesign is required.

Q: What is the difference between the B140-13-F and the 2 A rated alternatives?

A: The B140-13-F maintains the original 1 A current rating, providing a direct equivalent replacement. The 2 A rated parts offer higher current capacity while maintaining the same voltage rating and package. Selection depends on whether the application requires exact current rating matching or can benefit from additional current margin.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed are RoHS3 compliant except the original DSS1-40BA, which has no RoHS status specified. The RoHS3 compliance of substitute parts makes them suitable for applications subject to RoHS regulations.

Q: Which substitute part has the lowest forward voltage drop?

A: The SSA24-E3/5AT has the lowest forward voltage at 490 mV at 2 A. The original DSS1-40BA has 420 mV at 1 A. Forward voltage varies with current rating; direct comparison requires evaluation at the same current level.

Q: Can I use the RB056L-40TE25 in new designs?

A: The RB056L-40TE25 is classified as "Not For New Designs." It is available for legacy system support and maintenance but should not be selected for new product development. Active alternatives with higher current ratings are available.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Both packaging formats contain the same electronic component in the DO-214AC (SMA) package. Cut Tape (CT) & Digi-Reel packaging is suitable for lower-volume applications and manual assembly. Tape & Reel (TR) packaging is optimized for high-volume automated assembly. Selection depends on production volume and assembly equipment.

Q: Is the B240AQ-13-F suitable for automotive applications?

A: Yes. The B240AQ-13-F carries automotive grade designation and is qualified to AEC-Q101, making it appropriate for automotive rectification circuits requiring reliability standards compliance.

Q: What is the operating temperature range of the substitute parts?

A: Most substitute parts operate from -65°C to 150°C junction temperature. The SS24S-E3/5AT and SS24S-E3/61T operate from -55°C to 150°C. The CDBA240-G specifies 125°C maximum junction temperature. Verify operating temperature requirements for your specific application.

Q: Can I mix different substitute parts in the same circuit board?

A: All substitute parts meet the same electrical specifications for 40 V reverse voltage and DO-214AC (SMA) package compatibility. Mixing different manufacturers or part numbers in the same design is permissible from an electrical standpoint, though design documentation should clearly identify which part number is used in each location.

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