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Vishay General Semiconductor - Diodes Division SM15T39A-E3/57T
- Part No.:
- SM15T39A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T39A-E3/57T.pdf
- Description:
- TVS DIODE 33.3VWM 53.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,355
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Product details
Overview
SM15T39A-E3/57T 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-E3/57T datasheet, SM15T39A-E3/57T pinout, SM15T39A-E3/57T application, or SM15T39A-E3/57T equivalent, key selection criteria include verified clamping performance at 28.0 A IPPM, unidirectional polarity with cathode band marking, RoHS-compliant matte tin-plated leads, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SM15T39A-E3/57T employs a glass-passivated silicon junction optimized for low-inductance transient suppression. Its 10/1000 μs waveform response delivers 53.9 V clamping at 28.0 A, with thermal resistance RθJA = 75 °C/W and RθJL = 15 °C/W, enabling reliable operation up to 150 °C junction temperature under defined PCB pad layout.
It operates as a unidirectional device with cathode-band polarity identification, meets MSL Level 1 per J-STD-020 (260 °C peak reflow), and exhibits <1.0 μA reverse leakage at 33.3 V VWM, ensuring minimal standby power loss in protected circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 1500 W - sustains single high-energy transients without failure, typical for lightning surge protection on I/O lines |
| Stand-off Voltage (VWM) | 33.3 V - maximum continuous reverse voltage before significant leakage; sets operating margin below system rail |
| Breakdown Voltage (VBR) | 37.1–41.0 V at 1.0 mA - defines onset of avalanche conduction; ensures robust turn-on during overvoltage events |
| Clamping Voltage (VC) | 53.9 V at 28.0 A IPPM - limits voltage seen by downstream components during worst-case transient |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 0.320" x 0.246" footprint and 0.126" height for high-power density layouts |
| Operating Temperature | -65 °C to +150 °C - supports under-hood automotive and industrial environments without derating |
Pinout & Package
SM15T39A-E3/57T uses the SMC (DO-214AB) package: molded epoxy case meeting UL 94 V-0, matte tin-plated leads solderable per J-STD-002, and cathode identified by a visible band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to system ground or low-side reference | Provides return path during transient clamping; must be routed with low-inductance trace to minimize VL overshoot |
| Cathode | Current exit terminal in forward bias; marked by band; connected to protected line | Defines polarity-sensitive placement; reverse connection disables clamping function and risks device failure |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without external series impedance |
| Glass passivated chip junction | Ensures stable VBR and low leakage over lifetime; eliminates risk of moisture-induced parameter drift |
| Low inductance design | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), critical for protecting high-speed logic |
| MSL Level 1 rating (260 °C peak) | Supports standard lead-free reflow profiles without preconditioning or baking requirements |
| RoHS-compliant, commercial-grade (E3 suffix) | Meets EU RoHS Directive 2011/65/EU and JESD201 Class 2 whisker resistance for long-term reliability |
Applications
| Automotive Power Supply Protection | Industrial Motor Drive I/O Protection |
|---|---|
Use Scenario: Protecting 24 V DC power rails in vehicle ECUs against load-dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between supply rail and chassis ground to clamp positive-going surges above 33.3 V. Use Value: Limits rail voltage to ≤53.9 V during 28.0 A transients, preventing damage to 36 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Safeguarding analog input channels of PLC modules connected to solenoid valves and contactors. IC Role / Device Role / Timing Role: Standoff-connected TVS on signal line to absorb inductive kickback from 24 V coil switching. Use Value: Clamps transients within 100 ns, preserving ADC accuracy and avoiding false triggering of digital inputs. |
| Telecom Line Interface Protection | Consumer Sensor Signal Line Protection |
Use Scenario: Shielding RS-485 transceivers on outdoor telecom base station backhaul links from lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS on VCC-to-ground path to suppress common-mode surges coupled onto power bus. Use Value: Withstands 1500 W pulses without degradation, maintaining signal integrity across extended temperature ranges (-40 °C to +85 °C). |
Use Scenario: Securing I²C lines of MEMS accelerometers in smart home hubs exposed to ESD from user interaction. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 μA) TVS placed directly at connector to shunt ESD before entering level-shifter IC. Use Value: Prevents latch-up in 3.3 V interface ICs while adding <0.5 pF parasitic capacitance - no data rate impact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ36A | Lower peak power (400 W), higher VC (58.1 V at 6.9 A), SMA package (smaller thermal mass) | Not suitable for 1500 W lightning threats; limited to low-energy ESD and capacitive coupling events | Select only if transient threat level is ≤IEC 61000-4-2 Level 4 and board space is constrained |
| SMCJ36A | Same SMC package, identical VWM/VBR/VC, but rated for 1500 W with tighter VBR tolerance (5% vs. SM15T39A's 10%) | Higher cost; preferred where production test screening requires tighter parametric control | Choose when VBR consistency across lot is critical, e.g., in safety-critical automotive subsystems |
Compared with SMAJ36A and SMCJ36A, SM15T39A-E3/57T offers optimal balance of cost, proven 1500 W surge handling, and commercial-grade qualification - making it ideal for volume industrial and automotive applications where full AEC-Q101 is not mandated but robustness is essential.
Availability
SM15T39A-E3/57T is available at Aetrix Electronics and suitable for automotive power supply protection, industrial motor drive I/O protection, and telecom line interface protection requiring stable component supply, consistent parametric performance, and RoHS-compliant manufacturing.
Supply support for SM15T39A-E3/57T 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, power handling, and automotive qualification.
The SM15T Series was engineered for high-energy transient suppression in harsh environments - targeting 12 V/24 V automotive systems, industrial controls, and telecom infrastructure where failure modes must be predictable (short-circuit) and energy absorption must exceed 1 kW.
FAQ
What is the clamping voltage of SM15T39A-E3/57T at its rated peak pulse current?
The SM15T39A-E3/57T has a maximum clamping voltage (VC) of 53.9 V at 28.0 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured under standardized test conditions on 8.0 mm × 8.0 mm copper pads and defines the upper voltage limit imposed on protected circuitry during surge events. The SM15T39A-E3/57T maintains this clamping performance across its full operating temperature range.
Is SM15T39A-E3/57T suitable for automotive applications?
SM15T39A-E3/57T is RoHS-compliant and commercial-grade (E3 suffix); it is not AEC-Q101 qualified. For automotive use, Vishay offers the SM15T39AHE3_A/H variant with AEC-Q101 qualification. The SM15T39A-E3/57T may be used in non-safety-critical automotive subsystems where qualification is not mandated, but designers must validate reliability per application requirements. The SM15T39A-E3/57T shares identical electrical specs with its automotive-grade counterpart.
What does the "-E3/57T" suffix indicate in SM15T39A-E3/57T?
The "-E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting JESD201 Class 2 whisker resistance. The "/57T" indicates packaging in 7-inch diameter plastic tape and reel, with a base quantity of 850 units. This format supports automated SMT placement and is compatible with standard pick-and-place equipment. The SM15T39A-E3/57T is shipped in dry-packed moisture-barrier bags per J-STD-033.
How does SM15T39A-E3/57T differ from bidirectional TVS diodes like SM15T39CA?
SM15T39A-E3/57T is unidirectional and features a cathode band for polarity-specific installation; it conducts only during positive transients relative to its cathode. In contrast, SM15T39CA is bidirectional, symmetrical, and lacks polarity marking - suitable for AC lines or differential signals. The SM15T39A-E3/57T offers lower leakage (<1.0 μA at 33.3 V) than its bidirectional counterpart and is preferred for DC rail protection where polarity is fixed.
What PCB layout guidelines apply to SM15T39A-E3/57T for optimal transient suppression?
For optimal performance, SM15T39A-E3/57T must be mounted on minimum recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve specified thermal and pulse-current ratings. Traces to the device should be short and wide to minimize inductance; ground paths must be low-impedance. Avoid thermal relief on pads, and ensure no other components obstruct airflow around the SMC body. These practices ensure the SM15T39A-E3/57T delivers full 1500 W capability without thermal runaway.
SM15T39A-E3/57T 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-E3/57T FAQ
1.How can I place an order for SM15T39A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T39A-E3/57T 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-E3/57T reliable?
The price and inventory of SM15T39A-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T39A-E3/57T is usually 5 days.
3.What payment methods are accepted for SM15T39A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T39A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T39A-E3/57T?
SM15T39A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T39A-E3/57T 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-E3/57T?
For technical support, including SM15T39A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T39A-E3/57T requirements.
6.How does Aetrix verify that SM15T39A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SM15T39A-E3/57T 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-E3/57T meets industry standards.
7.What is the process for return or replacement of SM15T39A-E3/57T?
All SM15T39A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SM15T39A-E3/57T, 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-E3/57T part is unused and in its original packaging.
Return procedure for SM15T39A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T39A-E3/57T Tags
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