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Vishay General Semiconductor - Diodes Division SM6T39A-E3/52
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- Part No.:
- SM6T39A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T39A-E3/52.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,032
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Product details
Overview
SM6T39A-E3/52 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 33.3 V stand-off voltage (VWM), 37.1–41.0 V breakdown voltage (VBR) at 1 mA, 53.9 V maximum clamping voltage (VC) at 11.1 A peak pulse current, and 600 W peak pulse power capability with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the SM6T39A-E3/52 datasheet, SM6T39A-E3/52 pinout, SM6T39A-E3/52 application, or SM6T39A-E3/52 equivalent, key selection criteria include clamping voltage margin relative to protected circuit's absolute maximum rating, thermal resistance (RθJA = 100 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
The SM6T39A-E3/52 operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown range (37.1–41.0 V). Its glass-passivated junction ensures stable leakage performance (<1.0 μA at 33.3 V) and robust surge handling under repetitive or single-event transients.
It delivers precise clamping action with VC = 53.9 V at IPPM = 11.1 A (10/1000 μs), enabling reliable protection of 3.3 V, 5 V, and 24 V rail electronics. The device meets MSL level 1 per J-STD-020 and supports peak forward surge current up to 100 A (10 ms half-sine), making it suitable for inductive load switching suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - maximum continuous reverse operating voltage before conduction begins; sets safe margin below protected circuit's max rating |
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA - defines guaranteed avalanche onset range; ensures consistent turn-on across temperature and unit variation |
| VC @ IPPM | 53.9 V at 11.1 A (10/1000 μs) - peak clamped voltage seen by downstream circuit during worst-case transient |
| PPPM | 600 W - peak transient energy absorption capacity; determines survivability against lightning or ESD-like surges |
| RθJA | 100 °C/W - junction-to-ambient thermal resistance; requires minimum 5.0 mm × 5.0 mm copper pad area for rated power dissipation |
| Polarity | Unidirectional - cathode marked by band; blocks forward current until ~0.7 V, conducts reverse only above VBR |
| Package | SMB (DO-214AA) - surface-mount outline with 2.20 mm height, 3.94 mm length, and 2.18 mm minimum cathode pad width |
Pinout & Package
SMB (DO-214AA) package with two terminals: anode and cathode. Cathode identified by molded band on body. Designed for reflow soldering on standard PCB pads per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased terminal | Connects to protected line; conducts when transient exceeds VBR, shunting current to ground |
| Anode | Reference/ground terminal | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage event |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V industrial buses without derating |
| Glass passivated junction | Ensures <1.0 μA reverse leakage at VWM across -65 °C to +150 °C, critical for low-power sensor node reliability |
| MSL Level 1 rating | Allows unlimited floor life and single reflow at 260 °C peak, simplifying high-volume SMT manufacturing |
| RoHS-compliant matte tin plating | Meets JESD 201 Class 2 whisker resistance and solderability standards for long-term field deployment |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppresses load dump transients (up to 35 V, 100 ms) on 12 V battery-fed ECUs and lighting modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground, clamping spikes before they reach LDOs or microcontrollers. Use Value: Limits voltage excursion to ≤53.9 V during 11.1 A surge, preserving 36 V-rated input stages and meeting ISO 7637-2 Pulse 5a requirements. | Use Scenario: Shields analog front-end inputs of temperature/pressure sensors exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted directly at connector entry point, diverting fast transients before signal conditioning circuitry. Use Value: Clamps 8/20 μs surges to ≤69.7 V at 57 A, preventing latch-up in op-amps and ADCs while maintaining signal integrity below 1 MHz. |
| Telecom Line Card Surge Suppression | Consumer Power Adapter Input Protection |
Use Scenario: Protects DC input stage of PoE-powered network switches against induced surges from nearby AC wiring or lightning coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 48 V input rail, coordinated with upstream fuse and secondary filtering. Use Value: Absorbs 600 W transient energy without degradation, sustaining operation after repeated 10/1000 μs events per IEC 61000-4-5. | Use Scenario: Guards AC-DC adapter primary-side rectifier output against switching transients and mains-borne surges. IC Role / Device Role / Timing Role: Secondary-level TVS placed after bulk capacitor, limiting voltage overshoot during MOSFET turn-off. Use Value: Withstands 100 A non-repetitive forward surge (10 ms half-sine), ensuring survival during inrush or short-circuit fault conditions. |
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 PPPM (400 W), higher VWM (33 V), same SMB package and unidirectional polarity | Less margin for high-energy surges; suitable only where peak current <7.5 A expected | Select SMAJ33A if system-level testing confirms 400 W clamping suffices and cost sensitivity outweighs surge headroom |
| P6SMB33A | Identical electrical specs and SMB footprint; differs only in packaging code (tape/reel vs. bulk) and RoHS compliance status | No functional difference; P6SMB33A may lack AEC-Q101 qualification or JESD 201 whisker rating | Choose P6SMB33A only for non-automotive commercial use where full Vishay SM6T series qualifications are not required |
Compared with SMAJ33A and P6SMB33A, SM6T39A-E3/52 provides higher peak pulse power (600 W vs. 400 W or equivalent), tighter VBR tolerance (±5.3% vs. ±6.1%), and certified MSL Level 1 and JESD 201 Class 2 compliance - delivering superior reliability in automotive and industrial production environments.
Availability
SM6T39A-E3/52 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, telecom line card surge suppression, and consumer power adapter input protection requiring stable component supply and full traceability.
Supply support for SM6T39A-E3/52 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, MOSFETs, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SM6T Series is engineered specifically for high-energy transient suppression in harsh environments, targeting applications demanding AEC-Q101 qualification, low clamping voltage, and repeatable surge endurance - especially in automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of SM6T39A-E3/52 at its rated peak pulse current?
The SM6T39A-E3/52 has a maximum clamping voltage (VC) of 53.9 V at 11.1 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions and represents the highest voltage the protected circuit will experience during a worst-case transient event. The SM6T39A-E3/52 maintains this clamping performance across its qualified operating temperature range (-65 °C to +150 °C).
Is SM6T39A-E3/52 suitable for automotive applications?
Yes, SM6T39A-E3/52 is AEC-Q101 qualified when ordered with HE3 or HM3 suffixes. While the SM6T39A-E3/52 itself carries the RoHS-compliant E3 suffix and commercial-grade rating, its underlying die and construction meet AEC-Q101 stress test requirements. For automotive production, specify SM6T39AHE3_B or SM6T39AHM3_B to ensure full qualification documentation and traceability. The SM6T39A-E3/52 shares identical electrical and thermal specs with qualified variants.
What does the "-E3/52" suffix indicate in SM6T39A-E3/52?
The "-E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance. The "/52" indicates packaging in 7-inch diameter plastic tape and reel, with a base quantity of 750 units per reel. This format supports automated SMT placement and is compatible with standard pick-and-place equipment. SM6T39A-E3/52 is not halogen-free; for that specification, the M3 suffix must be used instead.
How does SM6T39A-E3/52 differ from bidirectional TVS diodes like SM6T39CA?
SM6T39A-E3/52 is unidirectional and functions only under reverse bias - it clamps positive transients on the cathode side while blocking forward current below ~0.7 V. In contrast, SM6T39CA is bidirectional and clamps transients of either polarity, making it suitable for AC lines or differential data paths. The SM6T39A-E3/52 requires correct polarity orientation during layout; misplacement renders it ineffective. Its lower capacitance and tighter leakage spec make it preferred for DC rail protection.
What PCB layout guidance applies to SM6T39A-E3/52 for optimal thermal and electrical performance?
For optimal performance, SM6T39A-E3/52 must be mounted on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. These pads reduce thermal resistance (RθJA = 100 °C/W) and improve surge current handling. Avoid narrow traces between the device and ground plane; use short, wide connections to minimize inductance. The cathode band must align with the designated net, and no silkscreen should obscure the marking. SM6T39A-E3/52 achieves best clamping response when placed within 2 mm of the protected IC's power pin.
SM6T39A-E3/52 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-E3/52 FAQ
1.How can I place an order for SM6T39A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T39A-E3/52 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-E3/52 reliable?
The price and inventory of SM6T39A-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T39A-E3/52 is usually 5 days.
3.What payment methods are accepted for SM6T39A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T39A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T39A-E3/52?
SM6T39A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T39A-E3/52 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-E3/52?
For technical support, including SM6T39A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T39A-E3/52 requirements.
6.How does Aetrix verify that SM6T39A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SM6T39A-E3/52 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-E3/52 meets industry standards.
7.What is the process for return or replacement of SM6T39A-E3/52?
All SM6T39A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SM6T39A-E3/52, 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-E3/52 part is unused and in its original packaging.
Return procedure for SM6T39A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T39A-E3/52 Tags
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