SS34-M3/57T Equivalent & Substitute Parts

Part Overview

The SS34-M3/57T 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 DO-214AB (SMC) surface mount package. This component is classified as Active and fully compliant with RoHS3 and REACH regulations. Equivalent and substitute parts are identified to address supply chain requirements, packaging preferences, and application-specific performance needs 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	500	mV @ 3 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500	µA @ 40 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SS34-M3/57T are classified into three categories based on electrical and mechanical compatibility:

Parametric Equivalents maintain identical electrical specifications (40 V, 3 A, 500 mV forward voltage @ 3 A) and package type (DO-214AB SMC), differing only in packaging format (Cut Tape vs. Tape & Reel) or manufacturer. These parts are direct functional replacements.

Upgrade Parts provide the same voltage and current ratings with alternative package types (SMA vs. SMC) or from different manufacturers, maintaining electrical performance within the same device class.

Manufacturer Recommended Alternatives offer higher current ratings (5 A or 6 A) or enhanced specifications (lower forward voltage, lower leakage current, automotive qualification) while maintaining the 40 V reverse voltage rating and DO-214AB package footprint. These parts are suitable for applications requiring improved thermal performance or higher current capacity.

Substitution eligibility is determined by:

Voltage - DC Reverse (Vr) rating: 40 V (fixed requirement)
Current - Average Rectified (Io): 3 A minimum
Package / Case: DO-214AB SMC (primary) or compatible alternatives
Technology: Schottky (fixed requirement)
Mounting Type: Surface Mount (fixed requirement)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Package / Case	Packaging Format	Product Status	Operating Temp (Max) [°C]
SS34-M3/57T	Vishay	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	Cut Tape (CT) & Digi-Reel®	Active	125
SS34-E3/57T	Vishay	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	Cut Tape (CT)	Active	125
SS34-E3/9AT	Vishay	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	Tape & Reel (TR)	Active	125
SS34	MDD	40	3	—	500 @ 40V	DO-214AC, SMA	—	Active	125
B540C-13-F	Diodes Incorporated	40	5	550 @ 5A	500 @ 40V	DO-214AB, SMC	Cut Tape (CT) & Digi-Reel®	Active	150
SK64L-TP	Micro Commercial Co	40	6	650 @ 6A	1000 @ 40V	DO-214AB, SMC	Tape & Reel (TR)	Not For New Designs	150
STPS340S	STMicroelectronics	40	3	630 @ 3A	20 @ 40V	DO-214AB, SMC	Cut Tape (CT) & Digi-Reel®	Active	150
STPS340SY	STMicroelectronics	40	3	630 @ 3A	20 @ 40V	DO-214AB, SMC	Cut Tape (CT) & Digi-Reel®	Active	150
STPS3L40S	STMicroelectronics	40	3	500 @ 3A	100 @ 40V	DO-214AB, SMC	Cut Tape (CT) & Digi-Reel®	Active	150
STPS3L40SY	STMicroelectronics	40	3	500 @ 3A	100 @ 40V	DO-214AB, SMC	Cut Tape (CT) & Digi-Reel®	Active	150
B340-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	DO-214AB, SMC	Cut Tape (CT) & Digi-Reel®	Active	125

Engineering Selection Recommendations

Direct Parametric Equivalents (Preferred for Drop-In Replacement)

SS34-E3/57T and SS34-E3/9AT are functionally identical to the SS34-M3/57T, differing only in packaging format. Both are manufactured by Vishay, maintain Active product status, and carry identical electrical specifications. Selection between these parts depends on assembly process requirements: Cut Tape (CT) format for SS34-E3/57T or Tape & Reel (TR) format for SS34-E3/9AT.

Alternative Manufacturers with Matched Specifications

STPS3L40S and STPS3L40SY (STMicroelectronics) provide identical electrical performance to the main part (40 V, 3 A, 500 mV forward voltage @ 3 A) with enhanced operating temperature range (-55°C to 150°C vs. -55°C to 125°C). Both are Active products in DO-214AB SMC packaging. STPS3L40SY includes automotive qualification (AEC-Q101) and is suitable for automotive applications.

B340-13-F (Diodes Incorporated) matches the SS34-M3/57T specification exactly (40 V, 3 A, 500 mV forward voltage @ 3 A) and is Active. Operating temperature range is -55°C to 125°C, identical to the main part.

Higher Current Capacity Alternatives

B540C-13-F (Diodes Incorporated) provides 5 A current rating with 40 V reverse voltage in DO-214AB SMC package. Forward voltage is 550 mV @ 5 A. Operating temperature extends to 150°C. This part is suitable for applications requiring higher current capacity within the same package footprint.

SK64L-TP (Micro Commercial Co) offers 6 A current rating at 40 V reverse voltage in DO-214AB SMC package. This part is classified as Not For New Designs and carries higher reverse leakage current (1 mA @ 40 V). Use is not recommended for new circuit designs.

Package Alternative

SS34 (MDD) provides equivalent electrical performance in DO-214AC (SMA) package instead of DO-214AB (SMC). This part is suitable only if the circuit board layout accommodates SMA package footprint.

Frequently Asked Questions (FAQ)

Q: Can SS34-E3/57T replace SS34-M3/57T directly?

A: Yes. SS34-E3/57T is a parametric equivalent manufactured by Vishay with identical electrical specifications (40 V, 3 A, 500 mV forward voltage @ 3 A) and DO-214AB SMC package. The difference is packaging format: SS34-E3/57T is supplied in Cut Tape (CT) format while SS34-M3/57T is supplied in Cut Tape & Digi-Reel® format. Selection depends on assembly equipment compatibility.

Q: What is the difference between STPS340S and STPS3L40S?

A: Both are STMicroelectronics Schottky diodes rated 40 V, 3 A in DO-214AB SMC package. STPS340S has forward voltage of 630 mV @ 3 A and reverse leakage of 20 µA @ 40 V. STPS3L40S has forward voltage of 500 mV @ 3 A and reverse leakage of 100 µA @ 40 V. STPS3L40S provides lower forward voltage, reducing power dissipation. Both are Active products with 150°C maximum junction temperature.

Q: Can I use B540C-13-F as a substitute for SS34-M3/57T?

A: B540C-13-F is electrically compatible but rated for higher current (5 A vs. 3 A). It maintains the 40 V reverse voltage rating and DO-214AB SMC package. Forward voltage is 550 mV @ 5 A compared to 500 mV @ 3 A for the SS34-M3/57T. This part is suitable for applications requiring higher current capacity or improved thermal margin. Operating temperature extends to 150°C.

Q: Is SK64L-TP recommended for new designs?

A: No. SK64L-TP is classified as Not For New Designs. While it provides 6 A current rating at 40 V in DO-214AB SMC package, it carries higher reverse leakage current (1 mA @ 40 V) and limited inventory. Use alternative parts for new circuit designs.

Q: What is the difference between STPS340SY and STPS3L40SY?

A: Both are STMicroelectronics automotive-qualified Schottky diodes (AEC-Q101) rated 40 V, 3 A in DO-214AB SMC package with -40°C to 150°C operating temperature range. STPS340SY has forward voltage of 630 mV @ 3 A and reverse leakage of 20 µA @ 40 V. STPS3L40SY has forward voltage of 500 mV @ 3 A and reverse leakage of 100 µA @ 40 V. STPS3L40SY provides lower forward voltage and is suitable for automotive applications requiring reduced power dissipation.

Q: Can I use the SMA package version (SS34 from MDD) instead of SMC?

A: The SMA package version (SS34 from MDD) is electrically equivalent but uses DO-214AC (SMA) package instead of DO-214AB (SMC). This substitution is only valid if the circuit board layout and assembly process accommodate the SMA package footprint. Verify PCB pad dimensions and component placement before substitution.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: (1) Voltage - DC Reverse (Vr) rating of 40 V, (2) Current - Average Rectified (Io) of 3 A minimum, (3) Schottky technology, (4) Surface Mount mounting type, and (5) DO-214AB SMC package or compatible alternative. Forward voltage, reverse leakage current, and operating temperature range may vary between substitutes but do not prevent functional substitution if the application requirements are met.

Q: Why does STPS3L40S have lower forward voltage than STPS340S?

A: Forward voltage variation between Schottky diodes of the same voltage and current rating is a result of different semiconductor material composition and junction design. STPS3L40S is optimized for lower forward voltage (500 mV @ 3 A) compared to STPS340S (630 mV @ 3 A). Lower forward voltage reduces power dissipation and heat generation in the application circuit. Selection depends on thermal and efficiency requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, matching the compliance status of the SS34-M3/57T.

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