SS14T3 Equivalent & Substitute Parts

Part Overview

The SS14T3 is a Schottky rectifier diode manufactured by onsemi, rated for 40 V DC reverse voltage and 1 A average rectified current in a surface mount SMA (DO-214AC) package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Schottky diodes in this voltage and current class are widely used in power supply circuits, reverse polarity protection, and high-frequency rectification applications where fast recovery characteristics are required. The SS14T3 operates across a junction temperature range of -55°C to 150°C with fast recovery time of 500 ns or less at currents exceeding 200 mA.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	470 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (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	—

Substitute Part Grouping Explanation

Substitution of the SS14T3 is determined by the following critical parameters:

Primary Matching Criteria:

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)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Substitution Logic:

Parts are grouped into three categories based on current rating:

Direct Equivalents (1 A Rating): Parts with identical 40 V / 1 A specifications. These provide pin-for-pin and functional compatibility with the SS14T3.
Higher Current Alternatives (2 A and 3 A Ratings): Parts with 40 V rating but increased current capacity (2 A or 3 A). These are electrically compatible and can replace the SS14T3 in applications where additional current margin is acceptable. The same SMA package accommodates higher current ratings.
Higher Voltage Alternative (100 V Rating): The SS14 from SMC Diode Solutions operates at 100 V, exceeding the 40 V requirement. This part is electrically compatible but introduces higher reverse voltage capability, which may not be necessary for 40 V applications.

All substitute parts maintain the same surface mount SMA package, fast recovery Schottky technology, and operating temperature range compatibility with the original SS14T3.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Package	Product Status	RoHS Status
SS14T3	onsemi	40	1	470 @ 1 A	100 @ 40 V	DO-214AC, SMA	Obsolete	Non-compliant
SS14	SMC Diode Solutions	100	1	850 @ 1 A	500 @ 100 V	DO-214AC, SMA	Active	ROHS3 Compliant
B140-13-F	Diodes Incorporated	40	1	500 @ 1 A	500 @ 40 V	DO-214AC, SMA	Active	ROHS3 Compliant
B140-E3/5AT	Vishay General Semiconductor - Diodes Division	40	1	520 @ 1 A	200 @ 40 V	DO-214AC, SMA	Active	ROHS3 Compliant
B140-E3/61T	Vishay General Semiconductor - Diodes Division	40	1	520 @ 1 A	200 @ 40 V	DO-214AC, SMA	Active	ROHS3 Compliant
B140Q-13-F	Diodes Incorporated	40	1	500 @ 1 A	500 @ 40 V	DO-214AC, SMA	Active	ROHS3 Compliant
B240A-13-F	Diodes Incorporated	40	2	500 @ 2 A	500 @ 40 V	DO-214AC, SMA	Active	ROHS3 Compliant
B240AQ-13-F	Diodes Incorporated	40	2	500 @ 2 A	500 @ 40 V	DO-214AC, SMA	Active	ROHS3 Compliant
B340A-13-F	Diodes Incorporated	40	3	500 @ 3 A	500 @ 40 V	DO-214AC, SMA	Active	ROHS3 Compliant
B340LA-13-F	Diodes Incorporated	40	3	450 @ 3 A	2000 @ 40 V	DO-214AC, SMA	Active	ROHS3 Compliant
CDBA140-G	Comchip Technology	40	1	500 @ 1 A	500 @ 40 V	DO-214AC, SMA	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended for 1:1 Replacement):

The following parts provide direct functional equivalence to the SS14T3 with identical 40 V / 1 A ratings and are all in active product status:

B140-13-F (Diodes Incorporated): Active status, ROHS3 compliant, 636,455 units in stock. Forward voltage of 500 mV @ 1 A is within acceptable range.
B140-E3/5AT (Vishay General Semiconductor - Diodes Division): Active status, ROHS3 compliant, 1,320 units in stock. Forward voltage of 520 mV @ 1 A is acceptable.
B140-E3/61T (Vishay General Semiconductor - Diodes Division): Active status, ROHS3 compliant, 23,400 units in stock. Identical specifications to B140-E3/5AT with higher inventory availability.
B140Q-13-F (Diodes Incorporated): Active status, ROHS3 compliant, AEC-Q101 automotive qualification, 40,400 units in stock. Suitable for automotive applications.
CDBA140-G (Comchip Technology): Active status, ROHS3 compliant, 1,610 units in stock. Forward voltage of 500 mV @ 1 A is within acceptable range.

Higher Current Alternatives (For Applications Requiring Current Margin):

B240A-13-F (Diodes Incorporated): 40 V / 2 A rating, active status, ROHS3 compliant, 125,300 units in stock.
B240AQ-13-F (Diodes Incorporated): 40 V / 2 A rating, active status, ROHS3 compliant, AEC-Q101 automotive qualification, 14,162 units in stock.
B340A-13-F (Diodes Incorporated): 40 V / 3 A rating, active status, ROHS3 compliant, AEC-Q101 automotive qualification, 335,400 units in stock.
B340LA-13-F (Diodes Incorporated): 40 V / 3 A rating, active status, ROHS3 compliant, 674,468 units in stock. Lower forward voltage of 450 mV @ 3 A.

Higher Voltage Alternative (For Overvoltage Protection Margin):

SS14 (SMC Diode Solutions): 100 V / 1 A rating, active status, ROHS3 compliant, 230,179 units in stock. Provides additional reverse voltage margin but exhibits higher forward voltage (850 mV @ 1 A) and higher reverse leakage (500 µA @ 100 V).

All substitute parts maintain the same DO-214AC (SMA) surface mount package, Schottky technology, and fast recovery characteristics of the original SS14T3. All active alternatives are ROHS3 compliant, addressing the non-compliance status of the obsolete SS14T3.

Frequently Asked Questions (FAQ)

Q: Can I use a 2 A or 3 A rated diode as a direct replacement for the 1 A SS14T3?

A: Yes. The B240A-13-F (2 A), B240AQ-13-F (2 A), B340A-13-F (3 A), and B340LA-13-F (3 A) are all electrically compatible with the SS14T3. Higher current ratings provide additional design margin and do not create functional incompatibility. The same SMA package accommodates these higher current ratings. Circuit performance remains within specification when using these alternatives.

Q: What is the difference between B140-E3/5AT and B140-E3/61T?

A: Both parts are manufactured by Vishay General Semiconductor - Diodes Division with identical electrical specifications: 40 V / 1 A, 520 mV forward voltage @ 1 A, and -65°C to 125°C operating temperature range. The primary difference is packaging format: B140-E3/5AT is supplied in Tape & Reel (TR) format with 1,320 units in stock, while B140-E3/61T is supplied in Cut Tape (CT) & Digi-Reel® format with 23,400 units in stock. Selection depends on procurement and assembly requirements.

Q: Why does the SS14 from SMC Diode Solutions have a 100 V rating instead of 40 V?

A: The SS14 is a higher voltage variant within the same product family. While it meets the 40 V requirement of the SS14T3, its 100 V rating provides additional reverse voltage margin. However, this results in higher forward voltage (850 mV @ 1 A versus 470 mV for the SS14T3) and higher reverse leakage current (500 µA @ 100 V versus 100 µA for the SS14T3). Use this part only when the additional voltage margin is required by circuit design.

Q: Are there automotive-qualified alternatives available?

A: Yes. The B140Q-13-F, B240AQ-13-F, and B340A-13-F all carry AEC-Q101 automotive qualification. These parts are suitable for automotive applications requiring industry-standard reliability and qualification documentation.

Q: What is the significance of RoHS3 compliance for substitute parts?

A: The original SS14T3 is RoHS non-compliant. All active substitute parts listed are ROHS3 compliant, meeting current environmental and regulatory requirements for electronic components. This compliance status is important for new designs and procurement in regulated markets.

Q: Can I substitute the SS14T3 with a part having a different forward voltage specification?

A: Forward voltage differences within the range provided (470 mV to 520 mV @ 1 A) are acceptable for most applications. The B140-13-F, B140Q-13-F, and CDBA140-G all specify 500 mV @ 1 A, which is 30 mV higher than the SS14T3. The B140-E3/5AT and B140-E3/61T specify 520 mV @ 1 A, which is 50 mV higher. These differences are within typical design tolerances for Schottky rectifier applications. Verify forward voltage impact in your specific circuit design if operating near thermal or efficiency limits.

Q: What is the difference between reverse leakage specifications across substitute parts?

A: Reverse leakage current varies among substitutes: the SS14T3 specifies 100 µA @ 40 V, while most alternatives specify 500 µA @ 40 V. The B140-E3/5AT and B140-E3/61T specify 200 µA @ 40 V. The B340LA-13-F specifies 2000 µA @ 40 V. Higher reverse leakage increases standby power dissipation in applications with sustained reverse bias. For low-power or battery-powered circuits, select parts with lower reverse leakage specifications.

Q: Is the SMA package identical across all substitute parts?

A: Yes. All substitute parts use the DO-214AC (SMA) surface mount package, which is physically and electrically identical. This ensures direct PCB footprint compatibility without layout modifications.

Q: What inventory levels should I consider when selecting a substitute?

A: Inventory availability varies significantly: B340LA-13-F has 674,468 units in stock, B340A-13-F has 335,400 units, B140-13-F has 636,455 units, and B140-E3/61T has 23,400 units. Higher inventory levels provide better long-term supply security. For critical applications, prioritize parts with substantial stock levels.

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