SS34-M3/9AT Equivalent & Substitute Parts

Part Overview

The SS34-M3/9AT 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 product status and is RoHS3 compliant. Equivalent and substitute parts are identified to support design flexibility, supply chain alternatives, and packaging format options while maintaining electrical and mechanical compatibility within specified 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	—
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
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-M3/9AT 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, 500 µA reverse leakage @ 40 V) and package format (DO-214AB SMC). These parts differ only in packaging format (Tape & Reel versus Cut Tape) or manufacturer source. Parametric equivalents are direct functional replacements with no circuit redesign required.

Upgrade Parts maintain the same voltage and current ratings but differ in package format (DO-214AC SMA versus DO-214AB SMC) or include additional specified parameters such as junction capacitance. These parts require PCB layout modification due to different package geometry.

Manufacturer Recommended Parts include alternatives from different manufacturers that meet or exceed the electrical specifications of the SS34-M3/9AT. These parts may exhibit variations in forward voltage, reverse leakage current, or operating temperature range. Selection depends on application-specific requirements and compliance certifications.

Key parameters determining substitution eligibility:

Voltage - DC Reverse (Vr) (Max): 40 V minimum
Current - Average Rectified (Io): 3 A minimum
Technology: Schottky
Package / Case: DO-214AB SMC (primary) or compatible surface mount package
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Package	Packaging Format	Tj (Max) [°C]	Product Status
SS34-M3/9AT	Vishay	40	3	500 @ 3A	500 @ 40V	DO-214AB SMC	Tape & Reel	125	Active
SS34-E3/57T	Vishay	40	3	500 @ 3A	500 @ 40V	DO-214AB SMC	Cut Tape	125	Active
SS34-E3/9AT	Vishay	40	3	500 @ 3A	500 @ 40V	DO-214AB SMC	Tape & Reel	125	Active
SS34	MDD	40	3	—	500 @ 40V	DO-214AC SMA	—	125	Active
SK64L-TP	Micro Commercial Co	40	6	650 @ 6A	1000 @ 40V	DO-214AB SMC	Tape & Reel	150	Not For New Designs
STPS340S	STMicroelectronics	40	3	630 @ 3A	20 @ 40V	DO-214AB SMC	Cut Tape & Digi-Reel	150	Active
STPS340SY	STMicroelectronics	40	3	630 @ 3A	20 @ 40V	DO-214AB SMC	Cut Tape & Digi-Reel	150	Active
STPS3L40S	STMicroelectronics	40	3	500 @ 3A	100 @ 40V	DO-214AB SMC	Cut Tape & Digi-Reel	150	Active
STPS3L40SY	STMicroelectronics	40	3	500 @ 3A	100 @ 40V	DO-214AB SMC	Cut Tape & Digi-Reel	150	Active
B340-13-F	Diodes Incorporated	40	3	500 @ 3A	500 @ 40V	DO-214AB SMC	Cut Tape & Digi-Reel	125	Active
SS34 V7G	Taiwan Semiconductor Corporation	40	3	500 @ 3A	500 @ 40V	DO-214AB SMC	—	125	Discontinued at DiGi Electronics

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended for Immediate Substitution)

SS34-E3/57T and SS34-E3/9AT are parametric equivalents manufactured by Vishay with identical electrical specifications to the SS34-M3/9AT. Both parts maintain 40 V reverse voltage, 3 A average rectified current, 500 mV forward voltage at 3 A, and 500 µA reverse leakage at 40 V. The primary difference is packaging format: SS34-E3/57T is supplied in Cut Tape format, while SS34-E3/9AT is supplied in Tape & Reel format. Both are Active product status and RoHS3 compliant. Selection between these parts depends on assembly equipment compatibility and supply chain requirements.

Manufacturer Alternatives with Enhanced Specifications

STPS3L40S and STPS3L40SY (STMicroelectronics) maintain identical electrical ratings (40 V, 3 A, 500 mV forward voltage @ 3 A) and package format (DO-214AB SMC) while offering extended maximum junction temperature (150°C versus 125°C). These parts are Active product status and RoHS3 compliant. STPS3L40SY includes automotive-grade qualification (AEC-Q101) and extended operating temperature range (-40°C to 150°C), suitable for applications requiring automotive compliance.

STPS340S and STPS340SY (STMicroelectronics) meet voltage and current specifications but exhibit higher forward voltage (630 mV @ 3 A versus 500 mV @ 3 A) and lower reverse leakage current (20 µA @ 40 V versus 500 µA @ 40 V). These parts are suitable for applications where lower leakage current is beneficial. STPS340SY includes automotive-grade qualification (AEC-Q101).

B340-13-F (Diodes Incorporated) is a parametric equivalent with identical electrical specifications (40 V, 3 A, 500 mV @ 3 A, 500 µA @ 40 V) and DO-214AB SMC package. This part is Active product status and RoHS3 compliant.

Higher Current Alternative

SK64L-TP (Micro Commercial Co) provides 6 A average rectified current in the same DO-214AB SMC package, suitable for applications requiring higher current capacity. This part is marked as Not For New Designs and exhibits higher forward voltage (650 mV @ 6 A) and higher reverse leakage current (1 mA @ 40 V). Use only when higher current rating is required and no other alternatives are available.

Package Format Upgrade

SS34 (MDD) maintains 40 V and 3 A specifications but uses DO-214AC SMA package instead of DO-214AB SMC. This part requires PCB layout modification due to different package geometry and pin spacing.

Discontinued Part

SS34 V7G (Taiwan Semiconductor Corporation) is discontinued at DiGi Electronics and should not be selected for new designs despite meeting electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can SS34-E3/57T replace SS34-M3/9AT directly on the PCB?

A: Yes. SS34-E3/57T is a parametric equivalent with identical electrical specifications and DO-214AB SMC package. The only difference is packaging format (Cut Tape versus Tape & Reel), which affects supply and assembly logistics but not PCB placement or electrical performance.

Q: What is the difference between STPS3L40S and STPS340S?

A: Both parts meet the 40 V, 3 A specifications and use DO-214AB SMC package. STPS3L40S maintains 500 mV forward voltage at 3 A (matching SS34-M3/9AT), while STPS340S exhibits 630 mV forward voltage at 3 A. STPS3L40S has higher reverse leakage current (100 µA @ 40 V) compared to STPS340S (20 µA @ 40 V). Selection depends on whether lower forward voltage or lower leakage current is prioritized for the application.

Q: Can I use STPS340SY instead of SS34-M3/9AT in an automotive application?

A: STPS340SY includes automotive-grade qualification (AEC-Q101) and is suitable for automotive applications. However, it exhibits higher forward voltage (630 mV @ 3 A versus 500 mV @ 3 A) and lower reverse leakage current (20 µA @ 40 V versus 500 µA @ 40 V). Verify that these parameter differences do not affect circuit performance before substitution.

Q: Why would I choose B340-13-F over SS34-M3/9AT?

A: B340-13-F is a parametric equivalent from Diodes Incorporated with identical electrical specifications. Selection is based on supply chain availability, pricing, or preferred supplier relationships. Both parts are functionally interchangeable.

Q: Is SK64L-TP a suitable replacement for SS34-M3/9AT?

A: SK64L-TP provides higher current capacity (6 A versus 3 A) but is marked as Not For New Designs. Use only if higher current rating is required and no other alternatives meet application requirements. This part exhibits higher forward voltage and higher reverse leakage current.

Q: What is the difference between SS34 (MDD) and SS34-M3/9AT?

A: SS34 (MDD) uses DO-214AC SMA package instead of DO-214AB SMC package. While electrical specifications are identical (40 V, 3 A), the different package requires PCB layout modification due to different pin spacing and footprint geometry.

Q: Can I substitute STPS3L40SY for applications requiring extended temperature range?

A: Yes. STPS3L40SY maintains identical electrical specifications (40 V, 3 A, 500 mV @ 3 A) and offers extended maximum junction temperature (150°C versus 125°C) and operating temperature range (-40°C to 150°C). This part includes automotive-grade qualification (AEC-Q101).

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, matching the compliance status of SS34-M3/9AT.

Q: What packaging formats are available for Vishay SS34 equivalents?

A: Vishay offers SS34-M3/9AT in Tape & Reel (TR) format and SS34-E3/57T in Cut Tape (CT) format. Both are parametric equivalents with identical electrical specifications. Selection depends on assembly equipment compatibility and supply chain requirements.

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