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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Vishay General Semiconductor - Diodes Division SM6T39A-E3/5B

Name: SM6T39A-E3/5B
Brand: Vishay General Semiconductor - Diodes Division
SKU: SM6T39A-E3/5B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SM6T39A-E3/5B

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-214AA, SMB

Datasheet:: SM6T39A-E3/5B.pdf

Description:: TVS DIODE 33.3VWM 53.9VC DO214AA

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Product details

Overview

SM6T39A-E3/5B from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, with 39 V breakdown voltage (V_BR = 37.1–41.0 V at 1.0 mA), 33.3 V stand-off voltage (V_WM), 53.9 V clamping voltage (V_C) at 11.1 A peak pulse current, and 600 W peak pulse power rating per 10/1000 μs waveform. It protects MOSFETs and sensor signal lines in automotive ECUs against inductive switching transients.

For engineers reviewing the SM6T39A-E3/5B datasheet, SM6T39A-E3/5B pinout, SM6T39A-E3/5B application, or SM6T39A-E3/5B equivalent, key selection criteria include unidirectional polarity, SMB package thermal resistance (R_θJA = 100 °C/W), AEC-Q101 qualification eligibility (via HE3 suffix), clamping performance under 10/1000 μs surge, and RoHS-compliant matte tin plating.

Technical Context

This TVS diode operates as a unidirectional clamping device, leveraging a glass-passivated silicon junction to deliver fast response (<1 ns) to voltage transients. Its design targets low-inductance operation and stable clamping across -65 °C to +150 °C junction temperature range, with thermal resistance optimized for PCB copper pad layouts (0.2" × 0.2").

The SM6T39A-E3/5B complies with J-STD-020 MSL Level 1 (peak reflow 260 °C) and supports automated SMT placement. It is rated for non-repetitive 100 A forward surge (10 ms half-sine) and exhibits <1.0 μA reverse leakage at V_WM, ensuring minimal standby power impact in protected circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_BR (min/max)	37.1 V / 41.0 V at 1.0 mA - defines precise breakdown threshold for reliable overvoltage triggering
V_WM	33.3 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 μA
V_C @ I_PPM	53.9 V at 11.1 A (10/1000 μs) - clamping voltage limiting downstream component stress during surge
P_PPM	600 W - peak transient power handling capability under standardized 10/1000 μs waveform
R_θJA	100 °C/W - thermal resistance from junction to ambient, based on 0.2" × 0.2" copper pads
T_J max	+150 °C - maximum allowable junction temperature, supporting under-hood automotive use
Package	SMB (DO-214AA) - surface-mount outline with cathode band marking, JEDEC-compliant footprint

Pinout & Package

SMB (DO-214AA) package: molded plastic case with matte tin-plated leads, cathode indicated by a band on the body; terminals solderable per J-STD-002 and JESD 22-B102; meets UL 94 V-0 flammability rating.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry point in forward bias	Connected to ground or low-side reference in unidirectional TVS configuration
Cathode	Current exit point in forward bias; marked with band	Connected to protected line (e.g., sensor supply or signal trace) to clamp positive transients

Key Features

Feature	Design Value
600 W peak pulse power	Enables robust protection against ISO 7637-2 Pulse 1/2a/5a transients in 12 V automotive systems
Glass passivated junction	Ensures stable V_BR tolerance and long-term reliability under thermal cycling and humidity
Low inductance SMB layout	Minimizes voltage overshoot during fast-rising transients (e.g., load dump, ESD)
AEC-Q101 qualification path	Supports automotive-grade sourcing via HE3/HM3 suffix variants with full stress test documentation
MSL Level 1 rating	Allows single-reflow assembly without moisture sensitivity concerns (260 °C peak)

Applications

Automotive Engine Control Unit (ECU)	Industrial Sensor Signal Conditioning
Use Scenario: Protecting 5 V sensor supply rails from inductive kickback during solenoid valve switching in engine bay environments. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between V_CC and GND, triggered by >33.3 V transients. Use Value: Limits voltage excursion to ≤53.9 V during 100 A surge events, preventing latch-up or damage to LDOs and microcontrollers.	Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA transmitter) from field wiring surges in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff-mode protector on signal path, conducting only when transient exceeds 33.3 V. Use Value: Maintains <1.0 μA leakage at nominal 24 V rail, preserving loop accuracy while suppressing 600 W transients.
Consumer Power Adapter Interface	Telecom Line Card Surge Protection
Use Scenario: Input-stage transient suppression on AC-DC adapter secondary side feeding USB-C PD controllers. IC Role / Device Role / Timing Role: Fast-clamping unidirectional TVS placed after rectifier, before bulk capacitor. Use Value: Clamps 10/1000 μs surges to 53.9 V within nanoseconds, avoiding overvoltage shutdown of synchronous rectifiers.	Use Scenario: Secondary-side protection on Ethernet PHY power rails exposed to lightning-induced coupling in outdoor base stations. IC Role / Device Role / Timing Role: Standby protector on 3.3 V or 5 V bias rail, activated only during overvoltage events. Use Value: Delivers 600 W surge capacity with R_θJA = 100 °C/W, enabling compact layout without heatsinking.

Automotive Engine Control Unit (ECU)

Industrial Sensor Signal Conditioning

Use Scenario: Protecting 5 V sensor supply rails from inductive kickback during solenoid valve switching in engine bay environments.

IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between V_CC and GND, triggered by >33.3 V transients.

Use Value: Limits voltage excursion to ≤53.9 V during 100 A surge events, preventing latch-up or damage to LDOs and microcontrollers.

Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA transmitter) from field wiring surges in factory automation cabinets.

IC Role / Device Role / Timing Role: Standoff-mode protector on signal path, conducting only when transient exceeds 33.3 V.

Use Value: Maintains <1.0 μA leakage at nominal 24 V rail, preserving loop accuracy while suppressing 600 W transients.

Consumer Power Adapter Interface

Telecom Line Card Surge Protection

Use Scenario: Input-stage transient suppression on AC-DC adapter secondary side feeding USB-C PD controllers.

IC Role / Device Role / Timing Role: Fast-clamping unidirectional TVS placed after rectifier, before bulk capacitor.

Use Value: Clamps 10/1000 μs surges to 53.9 V within nanoseconds, avoiding overvoltage shutdown of synchronous rectifiers.

Use Scenario: Secondary-side protection on Ethernet PHY power rails exposed to lightning-induced coupling in outdoor base stations.

IC Role / Device Role / Timing Role: Standby protector on 3.3 V or 5 V bias rail, activated only during overvoltage events.

Use Value: Delivers 600 W surge capacity with R_θJA = 100 °C/W, enabling compact layout without heatsinking.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ33A	Lower P_PPM (400 W), higher V_C (53.3 V at 7.5 A), same SMB package	Limited to lower-energy transients; not suitable for ISO 7637-2 Pulse 5a compliance	Select SMAJ33A only for cost-sensitive consumer designs where 400 W rating suffices
1.5SMC33A	Higher P_PPM (1500 W), larger SMC (DO-214AB) package, V_C = 53.3 V at 28.3 A	Requires PCB area increase (~30% larger footprint); better for high-reliability industrial surge standards	Choose 1.5SMC33A when system-level testing requires >1 kV/10/1000 μs immunity margin

Compared with SMAJ33A and 1.5SMC33A, the SM6T39A-E3/5B delivers optimal balance of 600 W surge capacity, SMB footprint compatibility, and 33.3 V standoff in automotive-qualified supply chains-without requiring board redesign or sacrificing clamping precision.

Availability

SM6T39A-E3/5B is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface design, and telecom line card surge mitigation requiring stable component supply, RoHS compliance, and traceable manufacturing history.

Supply support for SM6T39A-E3/5B includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and automotive-grade qualification.

The SM6T Series was engineered specifically for surface-mount transient suppression in space-constrained, high-reliability applications-including automotive powertrain, ADAS sensors, and industrial control I/O modules-where consistent clamping and AEC-Q101 readiness are mandatory.

FAQ

What is the clamping voltage of the SM6T39A-E3/5B under standard 10/1000 μs surge conditions?

The SM6T39A-E3/5B has a maximum clamping voltage (V_C) of 53.9 V at 11.1 A peak pulse current under the 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88385 and ensures downstream ICs see limited overvoltage stress during standardized surge events. The SM6T39A-E3/5B maintains this clamping performance across its specified operating temperature range.

Is the SM6T39A-E3/5B qualified for automotive applications?

The SM6T39A-E3/5B itself is RoHS-compliant commercial-grade; however, Vishay offers AEC-Q101-qualified versions under the HE3 and HM3 suffixes (e.g., SM6T39AHE3_B/I). The SM6T39A-E3/5B shares identical electrical and thermal characteristics with those qualified variants and is commonly used in automotive designs pending final qualification validation. Always verify qualification status using the full ordering code.

What does the "E3/5B" suffix indicate in SM6T39A-E3/5B?

The "E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads; "5B" specifies packaging in 13-inch diameter plastic tape and reel, with 3200 units per reel. This format supports high-volume SMT assembly and is compatible with standard pick-and-place equipment. The SM6T39A-E3/5B meets JESD 201 Class 2 whisker resistance requirements.

How does the SM6T39A-E3/5B compare to bidirectional TVS diodes like SM6T39CA?

The SM6T39A-E3/5B is unidirectional and clamps only positive transients relative to ground; SM6T39CA is bidirectional and suppresses both polarities. Their V_BR, V_WM, and P_PPM match, but SM6T39A-E3/5B must be oriented with cathode toward the protected line. Use SM6T39A-E3/5B where polarity is known and ground-referenced protection is sufficient-reducing cost and simplifying layout versus bidirectional alternatives.

What is the maximum reverse leakage current of the SM6T39A-E3/5B at its rated standoff voltage?

At V_WM = 33.3 V and T_A = 25 °C, the SM6T39A-E3/5B exhibits a maximum reverse leakage current (I_D) of 1.0 μA. This low leakage preserves signal integrity and minimizes quiescent power loss in always-on sensor interfaces. Leakage remains within specification up to +125 °C ambient, per Vishay's derating curves in document 88385.

SM6T39A-E3/5B Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Package/Case:: DO-214AA, SMB

Series:: SM6T, TransZorb®

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 33.3V

Voltage - Breakdown (Min):: 37.1V

Voltage - Clamping (Max) @ Ipp:: 53.9V

Current - Peak Pulse (10/1000µs):: 11.1A

Power - Peak Pulse:: 600W

Power Line Protection:: No

Applications:: General Purpose

Capacitance @ Frequency:: -

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AA (SMBJ)

SM6T39A-E3/5B FAQ

1.How can I place an order for SM6T39A-E3/5B through Aetrix?

Please submit a Request for Quotation (RFQ) for SM6T39A-E3/5B on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SM6T39A-E3/5B reliable?

The price and inventory of SM6T39A-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T39A-E3/5B is usually 5 days.

3.What payment methods are accepted for SM6T39A-E3/5B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39A-E3/5B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SM6T39A-E3/5B?

SM6T39A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SM6T39A-E3/5B order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SM6T39A-E3/5B?

For technical support, including SM6T39A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39A-E3/5B requirements.

6.How does Aetrix verify that SM6T39A-E3/5B is sourced from the original manufacturer or authorized distributors?

All SM6T39A-E3/5B products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SM6T39A-E3/5B meets industry standards.

7.What is the process for return or replacement of SM6T39A-E3/5B?

All SM6T39A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39A-E3/5B, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SM6T39A-E3/5B part is unused and in its original packaging.

Return procedure for SM6T39A-E3/5B:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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