SSA34-M3/5AT Equivalent & Substitute Parts

Part Overview

The SSA34-M3/5AT is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 40 V DC reverse voltage and 3 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as Active and complies with ROHS3 standards. Equivalent and substitute parts are identified to support procurement flexibility, supply chain continuity, and application-specific requirements while maintaining electrical and mechanical compatibility within defined parameters.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	490 mV @ 3 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°C ~ 150°C	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SSA34-M3/5AT are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Vishay SSA34 Series): Parts SSA34-E3/5AT, SSA34-E3/61T, SSA34HE3_A/H, and SSA34HE3_A/I share identical electrical specifications with the main part: 40 V reverse voltage, 3 A average rectified current, 490 mV forward voltage drop at 3 A, and DO-214AC (SMA) package. These parts differ only in packaging format (Cut Tape & Digi-Reel® versus Tape & Reel) and qualification grade (standard versus automotive AEC-Q101). Parametric equivalents provide direct functional replacement with no circuit redesign required.

Manufacturer Recommended Alternatives (Cross-Manufacturer): Parts from Diodes Incorporated (B140-13-F, B140Q-13-F, B340A-13-F, B340LA-13-F) and Comchip Technology (CDBA340-G, CDBA340-HF) meet the 40 V reverse voltage and 3 A current rating in DO-214AC (SMA) package but exhibit variations in forward voltage drop (450–500 mV @ 3 A), reverse leakage current (500 µA to 2 mA @ 40 V), and operating temperature range (-55°C to -50°C minimum versus -65°C). These alternatives are suitable for applications where the specified parameter variations are acceptable.

Substitution logic is based strictly on the following key parameters:

Voltage - DC Reverse (Vr) (Max): 40 V minimum
Current - Average Rectified (Io): 3 A minimum
Package / Case: DO-214AC, SMA
Technology: Schottky
Mounting Type: Surface Mount
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Tj (Min–Max) [°C]	Package	Packaging Format	Grade
SSA34-M3/5AT	Vishay	40	3	490 @ 3A	200 @ 40V	-65 to 150	DO-214AC (SMA)	Tape & Reel (TR)	Standard
SSA34-E3/5AT	Vishay	40	3	490 @ 3A	200 @ 40V	-65 to 150	DO-214AC (SMA)	Cut Tape (CT) & Digi-Reel®	Standard
SSA34-E3/61T	Vishay	40	3	490 @ 3A	200 @ 40V	-65 to 150	DO-214AC (SMA)	Cut Tape (CT) & Digi-Reel®	Standard
SSA34HE3_A/H	Vishay	40	3	490 @ 3A	200 @ 40V	-65 to 150	DO-214AC (SMA)	Tape & Reel (TR)	Automotive (AEC-Q101)
SSA34HE3_A/I	Vishay	40	3	490 @ 3A	200 @ 40V	-65 to 150	DO-214AC (SMA)	Tape & Reel (TR)	Automotive (AEC-Q101)
B140-13-F	Diodes Incorporated	40	1	500 @ 1A	500 @ 40V	-65 to 150	DO-214AC (SMA)	Cut Tape (CT) & Digi-Reel®	Standard
B140Q-13-F	Diodes Incorporated	40	1	500 @ 1A	500 @ 40V	-65 to 150	DO-214AC (SMA)	Cut Tape (CT) & Digi-Reel®	Automotive (AEC-Q101)
B340A-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	-55 to 150	DO-214AC (SMA)	Cut Tape (CT) & Digi-Reel®	Automotive (AEC-Q101)
B340LA-13-F	Diodes Incorporated	40	3	450 @ 3A	2000 @ 40V	-55 to 125	DO-214AC (SMA)	Cut Tape (CT) & Digi-Reel®	Standard
CDBA340-G	Comchip Technology	40	3	500 @ 3A	500 @ 40V	-55 to 150	DO-214AC (SMA)	Tape & Reel (TR)	Standard
CDBA340-HF	Comchip Technology	40	3	500 @ 3A	500 @ 40V	-50 to 150	DO-214AC (SMA)	Tape & Reel (TR)	Standard

Engineering Selection Recommendations

Direct Parametric Equivalents: The Vishay SSA34 series parts (SSA34-E3/5AT, SSA34-E3/61T, SSA34HE3_A/H, SSA34HE3_A/I) are electrically and mechanically identical to the SSA34-M3/5AT. Selection among these parts is determined by packaging format availability and application grade requirements. Standard-grade parts (SSA34-E3/5AT, SSA34-E3/61T) are suitable for general industrial applications. Automotive-grade parts with AEC-Q101 qualification (SSA34HE3_A/H, SSA34HE3_A/I) are required for automotive and safety-critical applications.

Cross-Manufacturer Alternatives: Diodes Incorporated and Comchip Technology parts meet the core voltage and current specifications but exhibit parameter variations that must be evaluated against circuit requirements:

B140-13-F and B140Q-13-F: Current rating is 1 A, which is below the 3 A requirement of the main part. These parts are not suitable for direct substitution in circuits requiring 3 A operation.
B340A-13-F: Meets 40 V and 3 A specifications with automotive AEC-Q101 qualification. Forward voltage is 500 mV (10 mV higher than SSA34-M3/5AT). Operating temperature minimum is -55°C (10°C higher than SSA34-M3/5AT). Suitable for automotive applications where the temperature and voltage specifications are acceptable.
B340LA-13-F: Meets 40 V and 3 A specifications with lower forward voltage (450 mV) but higher reverse leakage (2 mA versus 200 µA). Operating temperature range is -55°C to 125°C, which is narrower than the main part. Suitable only for applications where the reduced temperature range and higher leakage current are acceptable.
CDBA340-G and CDBA340-HF: Meet 40 V and 3 A specifications. Forward voltage is 500 mV. CDBA340-HF has a minimum operating temperature of -50°C (15°C higher than SSA34-M3/5AT). Both parts are suitable for general industrial applications where the temperature specification is acceptable.

Compliance and Certification: All listed parts are ROHS3 compliant and REACH unaffected. Automotive applications require AEC-Q101 qualified parts: SSA34HE3_A/H, SSA34HE3_A/I, B140Q-13-F, and B340A-13-F.

Frequently Asked Questions (FAQ)

Q: Can I substitute SSA34-M3/5AT with SSA34-E3/5AT or SSA34-E3/61T?

A: Yes. These Vishay parts are parametric equivalents with identical electrical specifications (40 V, 3 A, 490 mV forward voltage, 200 µA reverse leakage). The only difference is packaging format: SSA34-M3/5AT is supplied in Tape & Reel (TR), while SSA34-E3/5AT and SSA34-E3/61T are supplied in Cut Tape (CT) & Digi-Reel®. Selection depends on your assembly equipment and procurement requirements.

Q: What is the difference between standard-grade and automotive-grade SSA34 parts?

A: Standard-grade parts (SSA34-M3/5AT, SSA34-E3/5AT, SSA34-E3/61T) are suitable for general industrial applications. Automotive-grade parts (SSA34HE3_A/H, SSA34HE3_A/I) carry AEC-Q101 qualification, which certifies compliance with automotive reliability and quality standards. Use automotive-grade parts for automotive, medical, and safety-critical applications.

Q: Can I use B140-13-F or B140Q-13-F as a substitute?

A: No. These Diodes Incorporated parts are rated for 1 A average rectified current, while the SSA34-M3/5AT is rated for 3 A. Using a 1 A part in a 3 A circuit will result in device failure or thermal damage. These parts are not suitable substitutes.

Q: What are the key differences between B340A-13-F and SSA34-M3/5AT?

A: B340A-13-F meets the 40 V and 3 A specifications but has three parameter differences: (1) forward voltage is 500 mV versus 490 mV, (2) reverse leakage is 500 µA versus 200 µA, and (3) minimum operating temperature is -55°C versus -65°C. B340A-13-F carries AEC-Q101 automotive qualification. It is suitable for automotive applications where these parameter variations are acceptable.

Q: Is B340LA-13-F a good substitute for lower power dissipation?

A: B340LA-13-F has a lower forward voltage (450 mV versus 490 mV), which reduces power dissipation. However, it has significantly higher reverse leakage (2 mA versus 200 µA) and a narrower operating temperature range (-55°C to 125°C versus -65°C to 150°C). Use B340LA-13-F only if your application can tolerate the higher leakage current and reduced temperature range.

Q: Can I use CDBA340-G or CDBA340-HF from Comchip Technology?

A: Yes, for general industrial applications. Both parts meet the 40 V and 3 A specifications in DO-214AC (SMA) package. CDBA340-HF has a minimum operating temperature of -50°C (15°C higher than SSA34-M3/5AT). Verify that your application temperature range is compatible before selection.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the compliance status of the SSA34-M3/5AT.

Q: What packaging formats are available for the SSA34 series?

A: SSA34-M3/5AT is supplied in Tape & Reel (TR). SSA34-E3/5AT and SSA34-E3/61T are supplied in Cut Tape (CT) & Digi-Reel®. SSA34HE3_A/H and SSA34HE3_A/I are supplied in Tape & Reel (TR). Select based on your assembly equipment compatibility and procurement volume requirements.

Q: Which substitute part should I use for automotive applications?

A: For automotive applications, use AEC-Q101 qualified parts: SSA34HE3_A/H, SSA34HE3_A/I (Vishay), B140Q-13-F (Diodes Incorporated, 1 A only), or B340A-13-F (Diodes Incorporated, 3 A). SSA34HE3_A/H and SSA34HE3_A/I are direct parametric equivalents with automotive qualification.

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