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Vishay General Semiconductor - Diodes Division SM15T33AHE3/9AT
- Part No.:
- SM15T33AHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T33AHE3/9AT.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,594
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Product details
Overview
SM15T33AHE3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on power and signal lines. It features 33 V stand-off voltage (VWM), 34.7 V minimum breakdown voltage (VBR), 45.7 V maximum clamping voltage at 33 A peak pulse current, 1500 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for automotive use.
For engineers reviewing the SM15T33AHE3/9AT datasheet, SM15T33AHE3/9AT pinout, SM15T33AHE3/9AT application, or SM15T33AHE3/9AT equivalent, this part is selected for robust overvoltage protection in automotive ECUs, industrial I/O interfaces, and DC power rail conditioning where high IPPM, low clamping ratio, and automotive-grade reliability are required.
Technical Context
The SM15T33AHE3/9AT employs a glass-passivated silicon junction to achieve fast response (<1 ns) to transients and stable clamping under repetitive surge stress. Its unidirectional polarity enables integration into DC-biased circuits with cathode-anode orientation defined by the band marking.
Rated for 150 °C maximum junction temperature and 75 °C/W junction-to-ambient thermal resistance, it operates reliably under high ambient conditions when mounted on 8.0 mm × 8.0 mm copper pads. The device fails short-circuit under overstress - a predictable, system-safe failure mode aligned with automotive safety requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin. |
| VBR (min) | 31.4 V - Minimum breakdown voltage at 1 mA test current; ensures reliable turn-on above normal operating voltage. |
| VC @ IPPM | 45.7 V at 33 A - Clamping voltage during 10/1000 μs surge; limits downstream voltage stress to ≤45.7 V. |
| PPPM | 1500 W - Peak pulse power handling capability; withstands lightning-induced surges per IEC 61000-4-5. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test standard; enables use in ASIL-B systems without additional qualification. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; determines required PCB copper area for thermal management. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased terminal | Connected to protected line; conducts during positive transients relative to anode. |
| Anode (unbanded end) | Reference/ground terminal | Typically tied to system ground or lower-potential rail; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power (10/1000 μs) | Enables protection against severe lightning-induced surges per IEC 61000-4-5 Level 4 without derating. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes voltage overshoot across protected ICs, reducing risk of latch-up or gate oxide damage. |
| AEC-Q101 qualified (HE3 suffix) | Validates reliability for automotive applications including engine control, ADAS sensors, and body electronics. |
| MSL Level 1 (260 °C reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage current under thermal cycling and humidity exposure. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND to clamp surges up to ±100 V. Use Value: Limits voltage seen by MCU to ≤45.7 V during 33 A transients, preventing reset or permanent damage while meeting ISO 7637-2 Pulse 5a requirements. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) from ESD and inductive switching noise in factory automation PLC modules. IC Role / Device Role / Timing Role: TVS connected across signal and return lines to absorb fast-rising transients before reaching precision DAC or op-amp circuitry. Use Value: Clamps 8/20 μs surges to ≤59.0 V with <1 ns response, preserving signal integrity and avoiding ADC saturation or sensor calibration drift. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
Use Scenario: Securing 48 V DC input of PoE-powered network switches against induced surges from nearby lightning strikes or cable coupling. IC Role / Device Role / Timing Role: Primary TVS on main DC input rail upstream of DC-DC converters and hot-swap controllers. Use Value: Handles 1500 W pulses without degradation, maintaining >1000-cycle lifetime under repeated 10/1000 μs threats per Telcordia GR-1089-CORE. |
Use Scenario: Adding secondary-level surge protection on VUSB lines of smart home hubs exposed to user-handled cables and external accessories. IC Role / Device Role / Timing Role: Unidirectional TVS between +5 V supply and ground, complementing integrated ESD diodes in USB transceivers. Use Value: Extends system-level ESD immunity beyond IEC 61000-4-2 Level 4 by clamping 30 A transients to 45.7 V, preventing brownout or port disable events. |
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-E3/57T | Lower PPPM (400 W), same VWM (33 V), higher VC (53.3 V at 7.5 A), non-AEC-Q101 | Limited to commercial-grade consumer/industrial applications; insufficient for automotive load dump. | Select when cost sensitivity outweighs surge energy requirement and AEC-Q101 is not mandated. |
| SMCJ33AHE3/9AT | Same VWM (33 V), identical AEC-Q101 qualification, but higher PPPM (3000 W) and larger SMC package footprint | Used where higher surge margin is needed (e.g., front-end power entry), but requires PCB layout revision. | Choose when system-level testing reveals marginal margin with SM15T33AHE3/9AT and board space allows larger SMC variant. |
Compared with SMAJ33A-E3/57T and SMCJ33AHE3/9AT, the SM15T33AHE3/9AT delivers optimal balance of automotive qualification, 1500 W surge capacity, and compact SMC footprint - making it ideal for space-constrained ECUs and modules requiring validated reliability without over-engineering.
Availability
SM15T33AHE3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom power supply designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM15T33AHE3/9AT 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, efficiency, and application-specific optimization.
The SM15T Series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where consistent clamping performance and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SM15T33AHE3/9AT at its rated peak pulse current?
The SM15T33AHE3/9AT has a maximum clamping voltage (VC) of 45.7 V at 33 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping voltage remains stable across temperature due to the device's glass-passivated junction and low dynamic impedance.
Is SM15T33AHE3/9AT suitable for automotive applications?
Yes, SM15T33AHE3/9AT is AEC-Q101 qualified, as confirmed by the "HE3" suffix and Vishay documentation. It meets stress test requirements for temperature cycling, humidity, mechanical shock, and surge endurance - making it appropriate for under-hood and cabin-mounted automotive electronics including body control modules, infotainment power supplies, and ADAS sensor interfaces.
What does the "9AT" suffix indicate in SM15T33AHE3/9AT?
The "9AT" suffix denotes the packaging configuration: 13-inch diameter plastic tape and reel, with a base quantity of 3500 units per reel. This format supports high-volume automated SMT placement and is compatible with standard pick-and-place equipment. The "HE3" portion confirms RoHS-compliance and AEC-Q101 qualification.
How does SM15T33AHE3/9AT differ from bidirectional TVS diodes like SM15T33CAHE3/9AT?
The SM15T33AHE3/9AT is unidirectional and intended for DC-biased circuits where polarity is fixed; it features a cathode band marking. In contrast, SM15T33CAHE3/9AT is bidirectional, lacks polarity marking, and protects AC or floating lines. Their VWM and clamping characteristics are identical, but unidirectional variants offer lower leakage current and better performance in DC applications.
What is the thermal resistance of SM15T33AHE3/9AT, and how does it affect PCB layout?
The SM15T33AHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain TJ ≤ 150 °C under continuous 6.5 W dissipation, designers must provide adequate copper area and consider airflow or heatsinking. Reducing pad size increases RθJA and risks thermal runaway during sustained overvoltage events.
SM15T33AHE3/9AT 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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 33A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SM15T33AHE3/9AT FAQ
1.How can I place an order for SM15T33AHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T33AHE3/9AT 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 SM15T33AHE3/9AT reliable?
The price and inventory of SM15T33AHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T33AHE3/9AT is usually 5 days.
3.What payment methods are accepted for SM15T33AHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T33AHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T33AHE3/9AT?
SM15T33AHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T33AHE3/9AT 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 SM15T33AHE3/9AT?
For technical support, including SM15T33AHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T33AHE3/9AT requirements.
6.How does Aetrix verify that SM15T33AHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SM15T33AHE3/9AT 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 SM15T33AHE3/9AT meets industry standards.
7.What is the process for return or replacement of SM15T33AHE3/9AT?
All SM15T33AHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SM15T33AHE3/9AT, 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 SM15T33AHE3/9AT part is unused and in its original packaging.
Return procedure for SM15T33AHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T33AHE3/9AT Tags
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