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Vishay General Semiconductor - Diodes Division SM15T39A-E3/9AT
- Part No.:
- SM15T39A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T39A-E3/9AT.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:10,534
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Product details
Overview
SM15T39A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 33.3 V stand-off voltage (VWM), 37.1–41.0 V breakdown voltage (VBR), and 53.9 V clamping voltage (VC) at 28.0 A peak pulse current - used to protect MOSFETs, ICs, and sensor signal lines against lightning-induced and inductive-switching transients in automotive and industrial power supplies.
For engineers reviewing the SM15T39A-E3/9AT datasheet, SM15T39A-E3/9AT pinout, SM15T39A-E3/9AT application, or SM15T39A-E3/9AT equivalent, key selection criteria include verified unidirectional clamping performance at 33.3 V stand-off, RoHS-compliant commercial-grade construction with matte tin-plated leads, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads per terminal.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging a glass-passivated silicon junction to achieve low dynamic impedance and fast response (<1 ns) to transient overvoltage events. Its thermal resistance (RθJA = 75 °C/W) and maximum junction temperature of 150 °C support reliable operation under repeated surge conditions when mounted per recommended pad layout.
The device delivers 1500 W peak pulse power handling with a 10/1000 μs waveform and withstands 200 A non-repetitive forward surge current (10 ms half-sine). It meets J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance requirements, confirming suitability for high-reliability commercial PCB assembly without pre-baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33.3 V - maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage trip threshold |
| VBR (min/max) | 37.1 V / 41.0 V at 1.0 mA test current - defines guaranteed breakdown window for design margining |
| VC @ IPPM | 53.9 V at 28.0 A (10/1000 μs) - clamping voltage limiting downstream component stress during surge |
| PPPM | 1500 W - peak transient energy absorption capacity under standardized lightning surge waveform |
| RθJA | 75 °C/W - thermal resistance from junction to ambient; determines derating above 25 °C ambient |
| TJ max | +150 °C - maximum allowable junction temperature; enables operation in under-hood automotive environments |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile plastic case meeting UL 94 V-0 flammability rating; terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (cathode-banded end is opposite) | Connected to circuit ground or low-side reference; defines unidirectional current path during clamping |
| Cathode | Reverse-biased terminal marked by band | Connected to protected line (e.g., 33 V rail); conducts avalanche current when VLINE exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 33 V systems |
| Glass-passivated chip junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity |
| Low inductance structure | Minimizes voltage overshoot during fast-rising transients (<1 ns response), critical for MOSFET gate protection |
| MSL Level 1, 260 °C reflow compatible | Supports single-pass lead-free reflow without moisture sensitivity concerns or baking requirements |
| RoHS-compliant, commercial grade (E3 suffix) | Meets global environmental compliance mandates while maintaining cost-effective supply chain availability |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamping |
|---|---|
|
Use Scenario: Protecting 33 V battery-supplied ECUs from load-dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 33 V rail and chassis ground to clamp surges above 37.1 V. Use Value: Limits rail voltage to ≤53.9 V during 28 A transients, preventing damage to 40 V-rated DC-DC controllers and CAN transceivers. |
Use Scenario: Safeguarding analog output lines of pressure sensors in PLC I/O modules exposed to relay coil switching noise. IC Role / Device Role / Timing Role: TVS connected anode-to-ground, cathode-to-signal line to suppress ±1 kV EFT bursts. Use Value: Clamps induced spikes within 1 ns, preserving 12-bit ADC accuracy and avoiding false trigger in safety-critical feedback loops. |
| Telecom DC Power Input Stage | Consumer Device USB Power Path |
|
Use Scenario: Secondary surge protection on -48 V telecom rectifier outputs feeding base station backplanes. IC Role / Device Role / Timing Role: Unidirectional clamping device referenced to negative rail, absorbing common-mode lightning surges. Use Value: Withstands 1500 W pulses without degradation, enabling compliance with GR-1089-CORE immunity requirements. |
Use Scenario: Overvoltage guard on 5 V USB VBUS lines in smart home hubs subjected to hot-plug inductive kickback. IC Role / Device Role / Timing Role: Cathode tied to VBUS, anode to ground - activates only during positive overvoltage events. Use Value: 33.3 V VWM avoids leakage during normal operation while clamping >50 V faults below 54 V to protect USB-PD controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | Lower PPPM (400 W), higher VC (53.3 V @ 7.5 A), SMA package (smaller thermal mass) | Limited to lower-energy threats (IEC 61000-4-4); unsuitable for 1500 W lightning surges | Select SM15T39A-E3/9AT when system-level surge testing requires ≥1500 W capability and DO-214AB mechanical robustness |
| SMCJ33A | Same PPPM (1500 W), identical VWM/VBR/VC, but larger SMC package with same footprint and thermal performance | Functionally interchangeable; differs only in manufacturer-specific process and qualification history | SM15T39A-E3/9AT offers Vishay's AEC-Q101-qualified variant path (HE3 suffix) if future automotive qualification is required |
Compared with SMAJ33A and SMCJ33A, SM15T39A-E3/9AT provides identical 1500 W surge rating and clamping performance in a Vishay-optimized SMC package with documented J-STD-020 MSL Level 1 compliance and RoHS/E3 traceability - making it preferred for volume industrial designs requiring supply-chain stability and audit-ready documentation.
Availability
SM15T39A-E3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface circuits, and telecom DC input stages requiring stable component supply across multi-year production cycles.
Supply support for SM15T39A-E3/9AT 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, and protection devices with emphasis on reliability, thermal performance, and automotive-grade qualification.
The SM15T Series was engineered specifically for high-energy transient suppression in harsh environments - targeting 12 V–220 V systems where 1500 W surge immunity, low clamping voltage, and SMT manufacturability are mandatory.
FAQ
What is the clamping voltage of SM15T39A-E3/9AT at its rated peak pulse current?
The SM15T39A-E3/9AT has a maximum clamping voltage (VC) of 53.9 V when subjected to a 10/1000 μs waveform at 28.0 A peak pulse current (IPPM). This value is measured per Figure 1 in Vishay document 88380 and defines the upper voltage limit imposed on protected circuitry during surge events. The SM15T39A-E3/9AT maintains this clamping performance consistently across its qualified temperature range.
Is SM15T39A-E3/9AT suitable for automotive applications?
SM15T39A-E3/9AT is RoHS-compliant and commercial-grade (E3 suffix); it is not AEC-Q101 qualified in this specific variant. However, Vishay offers the automotive-qualified version as SM15T39AHE3_A/I (with HE3 suffix), which shares identical electrical specs and SMC packaging. For production automotive use, SM15T39A-E3/9AT should be replaced with the HE3 variant - the SM15T39A-E3/9AT itself is intended for industrial and telecom applications.
What does the "-E3/9AT" suffix indicate in SM15T39A-E3/9AT?
The "-E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads; "/9AT" specifies packaging in 13-inch diameter plastic tape and reel, with a base quantity of 3500 units. This format ensures compatibility with high-speed pick-and-place equipment and supports JIT manufacturing workflows. The SM15T39A-E3/9AT is fully compliant with J-STD-002 and JESD 22-B102 solderability standards.
How does SM15T39A-E3/9AT compare to bidirectional TVS diodes like SM15T39CA?
SM15T39A-E3/9AT is unidirectional and features a cathode band for polarity identification; SM15T39CA is bidirectional with no polarity marking and symmetric clamping in both directions. The SM15T39A-E3/9AT is used where only positive transients threaten the line (e.g., VCC rails), while SM15T39CA suits AC-coupled or differential signal lines. Both share identical VWM, VBR, and PPPM, but their circuit integration and grounding schemes differ fundamentally.
What is the thermal resistance and maximum junction temperature of SM15T39A-E3/9AT?
The SM15T39A-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, and a maximum junction temperature (TJ) of +150 °C. These values are validated per Vishay document 88380 and define safe operating limits under sustained power dissipation or repeated surge duty cycles. Derating curves in Figure 2 apply for operation above 25 °C ambient.
SM15T39A-E3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, 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):
- 28A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMCJ)
SM15T39A-E3/9AT FAQ
1.How can I place an order for SM15T39A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T39A-E3/9AT 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 SM15T39A-E3/9AT reliable?
The price and inventory of SM15T39A-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T39A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T39A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T39A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T39A-E3/9AT?
SM15T39A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T39A-E3/9AT 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 SM15T39A-E3/9AT?
For technical support, including SM15T39A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T39A-E3/9AT requirements.
6.How does Aetrix verify that SM15T39A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T39A-E3/9AT 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 SM15T39A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T39A-E3/9AT?
All SM15T39A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T39A-E3/9AT, 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 SM15T39A-E3/9AT part is unused and in its original packaging.
Return procedure for SM15T39A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T39A-E3/9AT Tags
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