SS14 Schottky Diode 40V 1A DO-214AC Equivalent & Substitute Parts

Part Overview

The SS14 is a Schottky rectifier diode rated for 40V reverse voltage and 1A average rectified current in a surface mount DO-214AC (SMA) package. Manufactured by onsemi, this component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product portfolio. Alternative equivalent parts are available from active product lines that maintain identical or compatible electrical and mechanical specifications, enabling direct substitution in existing designs and production environments.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	500	mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	200	µA @ 40 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-65 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS14 Schottky diode is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 40V
Current - Average Rectified (Io): 1A
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Technology: Schottky
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Acceptable Variation Ranges:

Voltage - Forward (Vf) (Max) @ If: 500–550 mV @ 1A (minor forward voltage tolerance)
Current - Reverse Leakage @ Vr: 12–500 µA @ 40V (leakage current variation acceptable within operational limits)
Operating Temperature - Junction: Minimum -55°C, Maximum 125–150°C (extended temperature range acceptable)

Non-Substitutable Parameters:

Current - Average Rectified (Io) must remain 1A; higher current ratings (2A, 3A) are not direct substitutes
Reverse voltage must remain 40V; different voltage ratings are not compatible
Package must remain DO-214AC (SMA); alternative packages are not interchangeable

Substitute parts are grouped into two categories: Direct Equivalents (identical electrical and thermal specifications from alternative manufacturers) and Compatible Alternatives (same voltage and current ratings with acceptable parameter variations).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Tj (Max) [°C]	Package	Product Status
SS14	onsemi	40	1	500 @ 1A	200 @ 40V	125	DO-214AC (SMA)	Not For New Designs
SS14-E3/61T	Vishay General Semiconductor	40	1	500 @ 1A	200 @ 40V	125	DO-214AC (SMA)	Active
SS14-M3/5AT	Vishay General Semiconductor	40	1	500 @ 1A	200 @ 40V	150	DO-214AC (SMA)	Active
SS14-M3/61T	Vishay General Semiconductor	40	1	500 @ 1A	200 @ 40V	150	DO-214AC (SMA)	Active
MBRA140T3G	onsemi	40	1	550 @ 1A	500 @ 40V	125	DO-214AC (SMA)	Active
STPS140A	STMicroelectronics	40	1	550 @ 1A	12 @ 40V	150	DO-214AC (SMA)	Active
B140-13-F	Diodes Incorporated	40	1	500 @ 1A	500 @ 40V	150	DO-214AC (SMA)	Active
B140Q-13-F	Diodes Incorporated	40	1	500 @ 1A	500 @ 40V	150	DO-214AC (SMA)	Active
B240A-13-F	Diodes Incorporated	40	2	500 @ 2A	500 @ 40V	150	DO-214AC (SMA)	Active
B240AQ-13-F	Diodes Incorporated	40	2	500 @ 2A	500 @ 40V	150	DO-214AC (SMA)	Active
B340A-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	150	DO-214AC (SMA)	Active

Engineering Selection Recommendations

Direct Equivalent Substitutes (1:1 Replacement)

The following parts are direct electrical and mechanical equivalents of the SS14 and are suitable for immediate substitution without circuit redesign:

SS14-E3/61T (Vishay General Semiconductor): Identical electrical specifications with Cut Tape & Digi-Reel packaging. Active product status. Operating temperature range -65°C to 125°C matches the original SS14.
SS14-M3/5AT (Vishay General Semiconductor): Identical electrical specifications with extended operating temperature range (-65°C to 150°C). Tape & Reel packaging. Active product status.
SS14-M3/61T (Vishay General Semiconductor): Identical electrical specifications with extended operating temperature range (-65°C to 150°C). Tape & Reel packaging. Active product status.

Compatible Substitutes (Acceptable Parameter Variation)

The following parts meet the core substitution criteria (40V, 1A, DO-214AC/SMA package) with acceptable variations in forward voltage or reverse leakage current:

MBRA140T3G (onsemi): Forward voltage 550 mV @ 1A (50 mV higher than SS14). Reverse leakage 500 µA @ 40V (higher than SS14). Active product status. Cut Tape & Digi-Reel packaging.
STPS140A (STMicroelectronics): Forward voltage 550 mV @ 1A. Reverse leakage 12 µA @ 40V (significantly lower than SS14, indicating superior leakage performance). Extended operating temperature to 150°C. Active product status. Cut Tape & Digi-Reel packaging.
B140-13-F (Diodes Incorporated): Forward voltage 500 mV @ 1A (matches SS14). Reverse leakage 500 µA @ 40V. Extended operating temperature to 150°C. Active product status. Cut Tape & Digi-Reel packaging.
B140Q-13-F (Diodes Incorporated): Forward voltage 500 mV @ 1A. Reverse leakage 500 µA @ 40V. AEC-Q101 automotive qualification. Extended operating temperature to 150°C. Active product status. Cut Tape & Digi-Reel packaging.

Non-Equivalent Parts (Not Suitable for Direct Substitution)

The following parts do not meet the 1A current requirement and are not direct substitutes:

B240A-13-F, B240AQ-13-F: Rated for 2A average rectified current. Suitable only for applications requiring higher current capacity.
B340A-13-F: Rated for 3A average rectified current. Suitable only for applications requiring higher current capacity.

Compliance and Certification Status

All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original SS14. Parts designated 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 I use B240A-13-F or B340A-13-F as a substitute for SS14?

A: No. The B240A-13-F is rated for 2A average rectified current, and the B340A-13-F is rated for 3A. The SS14 is rated for 1A. While these parts share the same 40V reverse voltage rating and DO-214AC package, the higher current rating makes them unsuitable as direct substitutes. Using a higher-rated component in a 1A circuit introduces unnecessary cost and may alter circuit performance characteristics.

Q: What is the difference between SS14-E3/61T and SS14-M3/5AT?

A: Both are Vishay equivalents of the SS14 with identical electrical specifications (40V, 1A, 500 mV forward voltage, 200 µA reverse leakage). The primary differences are packaging format and operating temperature range. SS14-E3/61T uses Cut Tape & Digi-Reel packaging with a maximum junction temperature of 125°C. SS14-M3/5AT uses Tape & Reel packaging with an extended maximum junction temperature of 150°C. Select based on packaging requirements and thermal operating conditions.

Q: Is STPS140A a better choice than the original SS14?

A: STPS140A meets all core substitution criteria (40V, 1A, DO-214AC/SMA package) with acceptable forward voltage variation (550 mV vs. 500 mV). A significant advantage is the substantially lower reverse leakage current (12 µA vs. 200 µA), which reduces power dissipation in standby conditions. Extended operating temperature to 150°C provides additional thermal margin. STPS140A is an active product from STMicroelectronics, ensuring long-term availability.

Q: Can I substitute SS14 with B140Q-13-F in automotive applications?

A: Yes. B140Q-13-F meets all electrical and mechanical substitution criteria and carries AEC-Q101 automotive qualification. It is suitable for automotive applications requiring formal qualification documentation. Forward voltage matches the original SS14 at 500 mV @ 1A, and operating temperature extends to 150°C.

Q: What does "Not For New Designs" mean for the original SS14?

A: This product status designation indicates that onsemi has discontinued the SS14 for new design applications. Existing inventory remains available, but the manufacturer recommends using alternative parts for new circuit designs. All listed substitute parts carry "Active" product status, indicating ongoing manufacturer support and long-term availability.

Q: Are there packaging differences between the substitute parts?

A: Yes. Substitute parts are available in two packaging formats: Cut Tape (CT) & Digi-Reel and Tape & Reel (TR). Both formats use the same DO-214AC (SMA) component package and are mechanically and electrically interchangeable. Packaging format selection depends on assembly equipment compatibility and procurement volume requirements. Cut Tape & Digi-Reel is suitable for lower-volume applications; Tape & Reel is optimized for high-volume automated assembly.

Q: What is the significance of reverse leakage current variation among substitutes?

A: Reverse leakage current (Ir) represents the small current flowing through the diode in reverse bias condition. The original SS14 specifies 200 µA @ 40V. Substitute parts range from 12 µA (STPS140A) to 500 µA (MBRA140T3G, B140-13-F, B140Q-13-F). Lower leakage current reduces power dissipation and heat generation in standby conditions. Higher leakage current remains within acceptable limits for most applications but may increase power consumption in low-power or battery-powered circuits. Select based on application power budget requirements.

Q: Can I use SS14-M3/61T in place of SS14-E3/61T?

A: Yes. Both parts are Vishay equivalents with identical electrical specifications. The primary difference is packaging format (Tape & Reel vs. Cut Tape & Digi-Reel) and extended operating temperature range for SS14-M3/61T (150°C vs. 125°C). Selection depends on assembly equipment compatibility and thermal operating conditions.

Q: What compliance certifications apply to all substitute parts?

A: All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original SS14. These certifications ensure compliance with environmental and hazardous substance regulations. Parts designated with AEC-Q101 qualification (B140Q-13-F, B240AQ-13-F, B340A-13-F) meet additional automotive industry qualification standards.

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