SS14T3G Equivalent & Substitute Parts

Part Overview

The SS14T3G 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 category are used in applications requiring fast switching recovery, low forward voltage drop, and efficient rectification at moderate voltage and current levels. The SS14T3G serves as a reference point for identifying functionally compatible alternatives from active manufacturers.

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 SS14T3G is determined by the following critical parameters:

Primary Substitution 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 or SMA equivalent
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Substitution Categories:

Direct Equivalents (40 V, 1 A): Parts meeting all primary criteria with identical voltage and current ratings. These include B140-13-F, B140-E3/5AT, B140-E3/61T, B140Q-13-F, CDBA140-G, and SS14 (SMC Diode Solutions).

Higher Current Capacity (40 V, 2 A or 3 A): Parts with the same voltage rating but increased current capacity. These include B240A-13-F, B240AQ-13-F, B340A-13-F, and B340LA-13-F. These are suitable for applications where the original 1 A rating is insufficient but the 40 V voltage specification remains unchanged.

Higher Voltage Rating (100 V, 1 A): The SS14 from SMC Diode Solutions operates at 100 V reverse voltage with 1 A current. This part is suitable only for applications where higher voltage margin is required and the circuit design permits operation at elevated reverse voltage.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Package	Product Status	RoHS Status
SS14T3G	onsemi	40	1	470 @ 1 A	100 @ 40 V	DO-214AC, SMA	Obsolete	—
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
SS14	SMC Diode Solutions	100	1	850 @ 1 A	500 @ 100 V	DO-214AC, SMA	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (40 V, 1 A Applications):

B140-13-F and B140Q-13-F from Diodes Incorporated are primary alternatives. Both are active products with ROHS3 compliance. B140Q-13-F carries AEC-Q101 automotive qualification, suitable for automotive and industrial applications requiring enhanced reliability screening. B140-13-F is available in higher volume (636,455 pcs) and offers cost efficiency for non-automotive applications.

B140-E3/5AT and B140-E3/61T from Vishay General Semiconductor are functionally equivalent with identical 40 V, 1 A ratings. These parts are ROHS3 compliant and active. B140-E3/61T offers higher inventory (23,400 pcs) compared to B140-E3/5AT (1,320 pcs).

CDBA140-G from Comchip Technology is an active alternative with 40 V, 1 A specifications and ROHS3 compliance. Inventory availability is limited (1,610 pcs).

For Higher Current Applications (40 V, 2 A or 3 A):

B240A-13-F and B240AQ-13-F support 2 A operation at 40 V. B240AQ-13-F includes AEC-Q101 automotive qualification. B240A-13-F has significantly higher inventory (125,300 pcs).

B340A-13-F and B340LA-13-F support 3 A operation at 40 V. B340A-13-F carries AEC-Q101 qualification. B340LA-13-F offers lower forward voltage (450 mV @ 3 A) but exhibits higher reverse leakage (2 mA @ 40 V). B340LA-13-F has the highest inventory among 3 A options (674,468 pcs).

For Higher Voltage Applications (100 V, 1 A):

SS14 from SMC Diode Solutions operates at 100 V reverse voltage with 1 A current. This part is suitable only when circuit design permits elevated reverse voltage operation. Forward voltage is significantly higher (850 mV @ 1 A) compared to 40 V alternatives. ROHS3 compliance is confirmed. Inventory is substantial (230,179 pcs).

Compliance Considerations:

All substitute parts listed are ROHS3 compliant and carry REACH Unaffected or REACH Affected status as indicated. Parts with AEC-Q101 qualification (B140Q-13-F, B240AQ-13-F, B340A-13-F) are suitable for automotive applications requiring formal qualification documentation.

Frequently Asked Questions (FAQ)

Q: Can B140-13-F directly replace SS14T3G in all applications?

A: B140-13-F meets the primary electrical specifications of SS14T3G: 40 V reverse voltage, 1 A average rectified current, fast recovery Schottky technology, and DO-214AC/SMA package. Both are surface mount components with identical mounting requirements. The forward voltage specification of B140-13-F (500 mV @ 1 A) is slightly higher than SS14T3G (470 mV @ 1 A), which is within typical design margins for rectifier applications. B140-13-F is an active product with ROHS3 compliance, making it suitable for new designs and production continuity.

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

A: Both parts are manufactured by Vishay General Semiconductor and share identical electrical specifications: 40 V reverse voltage, 1 A current, 520 mV forward voltage @ 1 A, and DO-214AC/SMA package. The primary difference is packaging format: B140-E3/5AT is supplied in Tape & Reel (TR), while B140-E3/61T is supplied in Cut Tape (CT) & Digi-Reel. B140-E3/61T has higher inventory availability (23,400 pcs vs. 1,320 pcs). Selection depends on procurement volume and assembly line requirements.

Q: When should I use B240A-13-F or B340A-13-F instead of direct 1 A equivalents?

A: B240A-13-F (2 A) and B340A-13-F (3 A) are used when the application requires higher current capacity than the original 1 A specification. These parts maintain the same 40 V reverse voltage rating and fast recovery Schottky technology. Use B240A-13-F when circuit current demands are between 1 A and 2 A. Use B340A-13-F when circuit current demands exceed 2 A. Both parts are pin-compatible in DO-214AC/SMA packages and are ROHS3 compliant.

Q: Is SS14 from SMC Diode Solutions a suitable replacement for SS14T3G?

A: SS14 from SMC Diode Solutions is not a direct replacement. While both are Schottky diodes in DO-214AC/SMA packages, SS14 operates at 100 V reverse voltage compared to SS14T3G at 40 V. The forward voltage is also significantly higher (850 mV @ 1 A vs. 470 mV @ 1 A). SS14 is suitable only for applications where the circuit design permits 100 V reverse voltage operation and where the higher forward voltage drop is acceptable. Use SS14 only when higher voltage margin is a design requirement.

Q: What does AEC-Q101 qualification mean for B140Q-13-F and B240AQ-13-F?

A: AEC-Q101 is an automotive qualification standard that certifies components for automotive applications. Parts carrying this qualification have undergone enhanced reliability testing and screening. B140Q-13-F and B240AQ-13-F are suitable for automotive and mission-critical applications where formal qualification documentation is required. Non-automotive applications do not require AEC-Q101 qualification; standard ROHS3 compliant alternatives such as B140-13-F are acceptable.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed in this reference are ROHS3 compliant. The original SS14T3G does not specify RoHS status. ROHS3 compliance ensures that parts do not contain restricted substances including lead, cadmium, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers. This compliance is mandatory for most commercial and industrial applications.

Q: What is the significance of reverse leakage current differences?

A: Reverse leakage current is the small current that flows through a diode when reverse biased. SS14T3G specifies 100 µA @ 40 V, while most substitute parts specify 500 µA @ 40 V. Higher reverse leakage increases power dissipation in standby conditions and may affect circuit performance in high-impedance applications. B340LA-13-F exhibits significantly higher reverse leakage (2 mA @ 40 V) and should be used only when this characteristic is acceptable for the application. For most rectifier applications, the difference between 100 µA and 500 µA is negligible.

Q: Can I use B140-E3/5AT in high-volume production?

A: B140-E3/5AT is available in limited inventory (1,320 pcs). For high-volume production, B140-13-F (636,455 pcs), B140-E3/61T (23,400 pcs), or B340LA-13-F (674,468 pcs) offer significantly higher availability. Confirm inventory status with suppliers before committing to production schedules.

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