SS24 Schottky Diode 40V 2A DO-214AA Equivalent & Substitute Parts

Part Overview

The SS24 is a Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 40V DC reverse voltage and 2A average rectified current in a DO-214AA (SMB) surface mount package. This component is classified as Active product status and is RoHS3 compliant with AEC-Q101 automotive qualification available in variant SS24H.

Substitute parts are necessary when the primary SS24 becomes unavailable, when specific packaging formats are required for manufacturing processes, or when alternative manufacturer sources are needed to meet supply chain requirements. The parts listed maintain electrical equivalence across the critical parameters that define Schottky diode functionality in rectification applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	40	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) Maximum @ If	500 mV @ 2 A	mV
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	400 µA @ 40 V	µA
Technology	Schottky	—
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55°C to 125°C	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SS24 is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Voltage - DC Reverse (Vr) Maximum: 40V
Current - Average Rectified (Io): 2A
Technology: Schottky
Mounting Type: Surface Mount
Package / Case: DO-214AA (SMB) or compatible surface mount package

Secondary Considerations:

Voltage - Forward (Vf) Maximum @ If: 500 mV @ 2A (or lower)
Current - Reverse Leakage @ Vr: 400 µA @ 40V (or lower)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Operating Temperature Range: -55°C to 125°C minimum
RoHS3 Compliance and MSL rating

Parts are grouped into the following categories:

Parametric Equivalents: Identical electrical specifications and DO-214AA package format. Differences exist only in packaging method (Cut Tape vs. Tape & Reel) or product status.

Direct Manufacturer Equivalents: Different manufacturer (Diodes Incorporated) with identical 40V/2A ratings but alternative package designation (SMA vs. SMB). Electrical performance is equivalent; package footprint differs.

Upgrade Options: Enhanced temperature range (-65°C to 150°C vs. -55°C to 125°C) or automotive-grade qualification (AEC-Q101). Electrical ratings remain equivalent or superior.

Similar Current Ratings: Parts with different current ratings (1A or 3A) at the same 40V rating. These are not direct substitutes but represent alternative current capacity options within the same voltage class.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Temp Range	Grade	Product Status
SS24	Taiwan Semiconductor	40V	2A	500 mV @ 2A	400 µA @ 40V	DO-214AA (SMB)	-55°C to 125°C	Standard	Active
SS24 R5G	Taiwan Semiconductor	40V	2A	500 mV @ 2A	400 µA @ 40V	DO-214AA (SMB)	-55°C to 125°C	Standard	Discontinued at DiGi Electronics
SS24H	Taiwan Semiconductor	40V	2A	500 mV @ 2A	400 µA @ 40V	DO-214AA (SMB)	-55°C to 125°C	Automotive (AEC-Q101)	Active
B240A-13-F	Diodes Incorporated	40V	2A	500 mV @ 2A	500 µA @ 40V	DO-214AC (SMA)	-65°C to 150°C	Standard	Active
SS24HE3_A/I	Vishay General Semiconductor	40V	2A	500 mV @ 2A	400 µA @ 40V	DO-214AA (SMB)	-65°C to 150°C	Automotive (AEC-Q101)	Active
B140BQ-13-F	Diodes Incorporated	40V	1A	500 mV @ 1A	500 µA @ 40V	DO-214AA (SMB)	-65°C to 150°C	Automotive (AEC-Q101)	Active
B240-13-F	Diodes Incorporated	40V	2A	500 mV @ 2A	500 µA @ 40V	DO-214AA (SMB)	-65°C to 150°C	Standard	Active
B240Q-13-F	Diodes Incorporated	40V	2A	500 mV @ 2A	500 µA @ 40V	DO-214AA (SMB)	-65°C to 150°C	Automotive (AEC-Q101)	Active
B340BQ-13-F	Diodes Incorporated	40V	3A	500 mV @ 3A	500 µA @ 40V	DO-214AA (SMB)	-55°C to 150°C	Automotive (AEC-Q101)	Active
B340LB-E3/52T	Vishay General Semiconductor	40V	3A	450 mV @ 3A	400 µA @ 40V	DO-214AA (SMB)	-65°C to 150°C	Standard	Active
B340LB-E3/5BT	Vishay General Semiconductor	40V	3A	450 mV @ 3A	400 µA @ 40V	DO-214AA (SMB)	-65°C to 150°C	Standard	Active

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical and Package Specifications):

SS24H and SS24 R5G are direct parametric equivalents to SS24. SS24H is the preferred choice for new designs requiring automotive-grade qualification (AEC-Q101) with extended temperature range (-65°C to 150°C). SS24 R5G maintains identical specifications but is discontinued at DiGi Electronics and should be used only when existing inventory is available.

Cross-Manufacturer Equivalents (40V/2A Rating):

B240-13-F (Diodes Incorporated) and B240Q-13-F (Diodes Incorporated) provide 40V/2A functionality with extended operating temperature range (-65°C to 150°C). B240Q-13-F includes AEC-Q101 automotive qualification. Both parts maintain the DO-214AA (SMB) package format. Reverse leakage current is 500 µA @ 40V, which is higher than the SS24 specification of 400 µA @ 40V but remains within acceptable operating parameters for most applications.

B240A-13-F (Diodes Incorporated) offers 40V/2A performance with extended temperature range but uses the DO-214AC (SMA) package, which has a different footprint than the DO-214AA (SMB). This part is suitable only when SMA package compatibility is confirmed.

SS24HE3_A/I (Vishay General Semiconductor) provides 40V/2A performance with AEC-Q101 automotive qualification and extended temperature range (-65°C to 150°C) in the DO-214AA (SMB) package. This part is suitable for automotive applications requiring enhanced temperature performance.

Higher Current Alternatives (40V Rating, 3A Capacity):

B340BQ-13-F, B340LB-E3/52T, and B340LB-E3/5BT are 40V/3A Schottky diodes in DO-214AA (SMB) packages. These parts are not direct substitutes for the 2A SS24 but provide increased current capacity within the same voltage class. Selection of these parts is appropriate only when circuit design permits higher current ratings.

Lower Current Alternative (40V Rating, 1A Capacity):

B140BQ-13-F is a 40V/1A Schottky diode with AEC-Q101 automotive qualification. This part is not a direct substitute for the 2A SS24 and should be used only when circuit requirements specify 1A maximum current.

Compliance and Certification:

All listed parts maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. Parts designated with AEC-Q101 qualification (SS24H, SS24HE3_A/I, B240Q-13-F, B340BQ-13-F) are suitable for automotive applications. Standard-grade parts (SS24, B240-13-F, B340LB-E3/52T, B340LB-E3/5BT) are suitable for industrial and consumer applications.

Frequently Asked Questions (FAQ)

Q: Can SS24 R5G be used as a direct replacement for SS24?

A: SS24 R5G is a parametric equivalent with identical electrical specifications (40V, 2A, 500 mV forward voltage, 400 µA reverse leakage) and the same DO-214AA (SMB) package. The primary difference is product status: SS24 R5G is discontinued at DiGi Electronics. It can be used as a replacement only when existing inventory is available and supply continuity is not a concern.

Q: What is the difference between SS24H and SS24?

A: SS24H is an automotive-grade variant of SS24 with AEC-Q101 qualification. Both parts share identical electrical specifications (40V, 2A, 500 mV forward voltage, 400 µA reverse leakage) and the DO-214AA (SMB) package. SS24H is suitable for automotive applications; SS24 is suitable for industrial and consumer applications. SS24H has higher inventory availability (8688 pcs vs. 230200 pcs for SS24).

Q: Can B240-13-F replace SS24 in all applications?

A: B240-13-F is electrically equivalent to SS24 at the 40V/2A rating and maintains the DO-214AA (SMB) package format. However, B240-13-F has a reverse leakage current of 500 µA @ 40V compared to SS24's 400 µA @ 40V. B240-13-F also offers extended operating temperature range (-65°C to 150°C vs. -55°C to 125°C). Substitution is appropriate when the higher reverse leakage and extended temperature range are compatible with circuit requirements.

Q: Why would I choose B240A-13-F over B240-13-F?

A: B240A-13-F uses the DO-214AC (SMA) package, while B240-13-F uses the DO-214AA (SMB) package. These packages have different physical footprints and are not interchangeable on the same PCB. B240A-13-F should be selected only when the circuit board layout specifically requires the SMA package format.

Q: Is SS24HE3_A/I suitable for automotive applications?

A: Yes. SS24HE3_A/I is manufactured by Vishay General Semiconductor and carries AEC-Q101 automotive qualification. It provides 40V/2A performance in the DO-214AA (SMB) package with extended operating temperature range (-65°C to 150°C). This part is suitable for automotive applications requiring enhanced temperature performance.

Q: Can B340BQ-13-F be used instead of SS24?

A: B340BQ-13-F is a 40V/3A Schottky diode, not a direct substitute for the 2A SS24. It can be used only when circuit design permits higher current capacity. The 3A rating provides additional margin but does not make it a direct replacement. Substitution requires circuit-level analysis to confirm that the higher current rating does not introduce unintended circuit behavior.

Q: What is the significance of the DO-214AA (SMB) package designation?

A: DO-214AA and SMB are equivalent designations for the same surface mount package format. Parts specified with this package have identical physical dimensions and PCB footprints. Parts with alternative package designations (such as DO-214AC/SMA) have different footprints and are not interchangeable without PCB redesign.

Q: Are all listed parts RoHS3 compliant?

A: Yes. All parts listed in this reference maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. This ensures compatibility with modern manufacturing processes and environmental regulations.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts carrying this qualification have undergone additional testing and reliability validation for automotive applications. AEC-Q101 qualification is required for components used in automotive systems but is not necessary for industrial or consumer applications.

Q: Can I use parts with different reverse leakage currents interchangeably?

A: Reverse leakage current differences (400 µA vs. 500 µA @ 40V) are within normal manufacturing tolerances for Schottky diodes. Substitution is appropriate for most applications. However, circuits with stringent leakage requirements or high-impedance signal paths may require verification that the higher leakage current does not degrade performance.

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