SSA24 Equivalent & Substitute Parts

Part Overview

The SSA24 is a Schottky rectifier diode manufactured by onsemi, rated for 40 V DC reverse voltage and 2 A average rectified current in a DO-214AC (SMA) surface mount package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary to support existing designs, maintain production continuity, and ensure long-term component availability for applications currently utilizing the SSA24.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 2 A
Technology	Schottky
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	9.84 ns
Package / Case	DO-214AC, SMA
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SSA24 is determined by strict equivalence across the following critical parameters:

Direct Substitutes (Identical Electrical and Mechanical Specifications): Parts that match all key electrical parameters (40 V reverse voltage, 2 A average rectified current, 500 mV forward voltage at 2 A) and package type (DO-214AC/SMA) are classified as direct substitutes. These parts maintain identical form factor and thermal characteristics, enabling pin-for-pin replacement without circuit modification.

Current-Limited Alternatives (Reduced Current Rating): Parts rated for 1 A average rectified current (B140-13-F, B140Q-13-F) are functionally compatible in applications where the circuit current demand does not exceed 1 A. These parts share identical voltage ratings, package type, and fast recovery characteristics but have reduced current capacity.

Current-Enhanced Alternatives (Increased Current Rating): Parts rated for 3 A average rectified current (B340A-13-F, B340LA-13-F, RB050L-40DDTE25, RB050L-40TE25, RB056L-40TE25) are electrically compatible and can replace the SSA24 in applications requiring higher current handling. These parts maintain the 40 V voltage rating and fast recovery speed but provide additional current margin.

Package Variant Considerations: Parts supplied in PMDS package (RB050L-40DDTE25, RB050L-40TE25, RB056L-40TE25) differ from the standard SMA package but maintain electrical equivalence. Package selection depends on PCB layout and thermal management requirements.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Package	Product Status	AEC-Q101	Temp Range
SSA24	onsemi	40 V	2 A	500 mV @ 2 A	DO-214AC (SMA)	Not For New Designs	Yes	-55°C ~ 150°C
B240AQ-13-F	Diodes Incorporated	40 V	2 A	500 mV @ 2 A	DO-214AC (SMA)	Active	Yes	-65°C ~ 150°C
SS24A	SMC Diode Solutions	40 V	2 A	550 mV @ 2 A	DO-214AC (SMA)	Active	No	-55°C ~ 150°C
B140-13-F	Diodes Incorporated	40 V	1 A	500 mV @ 1 A	DO-214AC (SMA)	Active	No	-65°C ~ 150°C
B140Q-13-F	Diodes Incorporated	40 V	1 A	500 mV @ 1 A	DO-214AC (SMA)	Active	Yes	-65°C ~ 150°C
B240A-13-F	Diodes Incorporated	40 V	2 A	500 mV @ 2 A	DO-214AC (SMA)	Active	No	-65°C ~ 150°C
B340A-13-F	Diodes Incorporated	40 V	3 A	500 mV @ 3 A	DO-214AC (SMA)	Active	Yes	-55°C ~ 150°C
B340LA-13-F	Diodes Incorporated	40 V	3 A	450 mV @ 3 A	DO-214AC (SMA)	Active	No	-55°C ~ 125°C
RB050L-40DDTE25	Rohm Semiconductor	40 V	3 A	550 mV @ 3 A	PMDS	Not For New Designs	Yes	-55°C ~ 125°C
RB050L-40TE25	Rohm Semiconductor	40 V	3 A	550 mV @ 3 A	PMDS	Not For New Designs	No	-55°C ~ 125°C
RB056L-40TE25	Rohm Semiconductor	40 V	3 A	670 mV @ 3 A	PMDS	Not For New Designs	No	-55°C ~ 150°C

Engineering Selection Recommendations

Primary Substitute (Direct Replacement): B240AQ-13-F from Diodes Incorporated is the recommended direct substitute for the SSA24. This part maintains identical electrical specifications (40 V, 2 A, 500 mV forward voltage), identical package type (DO-214AC/SMA), and holds Active product status. Both parts carry AEC-Q101 automotive qualification. The B240AQ-13-F extends the operating temperature range to -65°C, providing enhanced low-temperature performance compared to the SSA24.

Alternative Direct Substitute: B240A-13-F from Diodes Incorporated provides identical electrical and package specifications with Active product status. This part does not carry AEC-Q101 qualification, making it suitable for non-automotive applications or where automotive qualification is not required.

Secondary Substitute (Voltage and Package Compatible, Current-Enhanced): B340A-13-F from Diodes Incorporated is rated for 3 A average rectified current while maintaining 40 V reverse voltage and DO-214AC/SMA package compatibility. This part carries AEC-Q101 qualification and Active product status. Selection of this part is appropriate when circuit redesign permits higher current capacity or when additional thermal margin is beneficial.

Non-Recommended Substitutes: SS24A from SMC Diode Solutions exhibits a forward voltage specification of 550 mV at 2 A, which exceeds the SSA24 specification of 500 mV at 2 A. This parameter deviation may affect circuit performance in applications with tight voltage margin requirements. Additionally, SS24A does not carry AEC-Q101 qualification.

RB050L-40DDTE25, RB050L-40TE25, and RB056L-40TE25 from Rohm Semiconductor are rated for 3 A current but employ PMDS package instead of standard SMA, requiring PCB layout modification. These parts carry "Not For New Designs" status, aligning with the SSA24 end-of-life classification. RB050L-40TE25 and RB056L-40TE25 lack AEC-Q101 qualification.

Current-Limited Alternatives: B140-13-F and B140Q-13-F are rated for 1 A average rectified current. These parts are suitable only for applications where circuit current demand does not exceed 1 A. B140Q-13-F carries AEC-Q101 qualification; B140-13-F does not.

Frequently Asked Questions (FAQ)

Q: Can B240AQ-13-F be used as a direct replacement for SSA24 without circuit modification?

A: Yes. B240AQ-13-F matches all critical electrical parameters (40 V reverse voltage, 2 A average rectified current, 500 mV forward voltage at 2 A) and uses the identical DO-214AC (SMA) package. Pin-for-pin replacement is possible without circuit redesign.

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

A: Both parts share identical electrical specifications and package type. The primary difference is AEC-Q101 automotive qualification: B240AQ-13-F carries this certification; B240A-13-F does not. Selection depends on whether automotive qualification is required for the application.

Q: Why is SS24A not recommended as a substitute despite matching current and voltage ratings?

A: SS24A specifies a maximum forward voltage of 550 mV at 2 A, compared to the SSA24 specification of 500 mV at 2 A. This 50 mV difference may cause circuit performance degradation in applications with limited voltage margin. Additionally, SS24A lacks AEC-Q101 qualification.

Q: Can B340A-13-F replace SSA24 in existing designs?

A: B340A-13-F is electrically compatible and maintains the same package type and voltage rating. The 3 A current rating exceeds the SSA24 specification of 2 A, providing additional current capacity. This part is suitable for direct replacement in applications where the circuit current does not exceed 3 A. No circuit modification is required.

Q: What is the significance of the PMDS package used in Rohm Semiconductor parts?

A: PMDS is a surface mount package variant that differs from the standard SMA package used in the SSA24. Parts using PMDS package require PCB layout modification to accommodate the different footprint. Selection of PMDS variants should occur only when PCB redesign is feasible or when thermal management benefits justify the layout change.

Q: Are the Rohm Semiconductor parts (RB050L-40DDTE25, RB050L-40TE25, RB056L-40TE25) suitable for new designs?

A: No. All three Rohm parts carry "Not For New Designs" product status, identical to the SSA24. These parts are appropriate only for sustaining existing designs or production continuity. For new designs, select parts with Active product status such as B240AQ-13-F or B340A-13-F.

Q: What is the impact of operating temperature range differences between SSA24 and substitute parts?

A: The SSA24 operates from -55°C to 150°C. B240AQ-13-F extends the low-temperature limit to -65°C, providing enhanced performance in cold environments. Some Rohm parts limit the maximum temperature to 125°C, which may be restrictive for high-temperature applications. Verify that the selected substitute meets the application's temperature requirements.

Q: Can B140Q-13-F be used in applications currently using SSA24?

A: B140Q-13-F is suitable only for applications where the circuit current demand does not exceed 1 A. The SSA24 is rated for 2 A; therefore, B140Q-13-F cannot be used as a direct replacement in circuits requiring 2 A current. Use this part only when circuit analysis confirms that current demand is limited to 1 A or less.

Q: What does AEC-Q101 qualification indicate?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts carrying this certification have undergone rigorous testing for reliability and performance in automotive applications. For automotive designs, select parts with AEC-Q101 qualification such as B240AQ-13-F, B140Q-13-F, B340A-13-F, or RB050L-40DDTE25.

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