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Vishay General Semiconductor - Diodes Division SM15T33AHE3/57T
- Part No.:
- SM15T33AHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T33AHE3/57T.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,390
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Product details
Overview
SM15T33AHE3/57T from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 33 V stand-off voltage (VWM = 28.2 V), 45.7 V clamping voltage at 33 A IPPM, and AEC-Q101 qualified for automotive applications. It protects MOSFETs and signal lines in automotive sensor units against inductive switching transients.
For engineers reviewing the SM15T33AHE3/57T datasheet, SM15T33AHE3/57T pinout, SM15T33AHE3/57T application, or SM15T33AHE3/57T equivalent, key selection criteria include clamping performance under 10/1000 μs surge, unidirectional polarity with cathode band marking, AEC-Q101 qualification status, and SMC package thermal resistance (RθJA = 75 °C/W).
Technical Context
The SM15T33AHE3/57T operates as a unidirectional avalanche breakdown device with a specified breakdown voltage range of 31.4–34.7 V at 1 mA test current. Its low-inductance SMC package and glass-passivated junction enable fast response to transients up to 1500 W, while maintaining stable clamping at 45.7 V under 33 A peak pulse current.
Designed for high-reliability automotive environments, it features MSL Level 1 moisture sensitivity, matte tin-plated leads compliant with J-STD-002, and a maximum junction temperature of 150 °C. The device fails short-circuit under overstress, supporting predictable system-level fault containment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 28.2 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 31.4–34.7 V at 1 mA - Confirmed avalanche initiation range; ensures reliable turn-on during transients |
| VC (Clamping Voltage) | 45.7 V at IPPM = 33 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge |
| PPPM (Peak Pulse Power) | 1500 W - Sustains lightning-induced or motor-switching surges without degradation when mounted per recommended pad layout |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient; requires minimum 8.0 mm × 8.0 mm copper pads per terminal for rated derating |
| TJ max. | 150 °C - Maximum allowable junction temperature; supports operation in under-hood automotive environments |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads. Cathode indicated by molded band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or low-side reference in unidirectional TVS configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line; avalanche conduction occurs from cathode to anode during overvoltage |
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) in automotive power nets |
| Glass passivated chip junction | Ensures stable breakdown characteristics and long-term reliability under thermal cycling and humidity stress |
| Low inductance SMC package | Minimizes voltage overshoot during fast-rising transients (< 1 ns rise time), critical for MOSFET gate protection |
| AEC-Q101 qualification (HE3 suffix) | Validates suitability for automotive safety-critical subsystems including ADAS sensor interfaces and body control modules |
| MSL Level 1, peak reflow 260 °C | Supports single-pass lead-free reflow assembly without popcorn or delamination risk |
Applications
| Automotive Sensor Protection | Industrial Motor Drive I/O |
|---|---|
Use Scenario: Protecting LIN/CAN transceiver signal lines in automotive door module sensors exposed to load-dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between signal line and chassis ground. Use Value: Limits transient voltage to ≤45.7 V during 33 A surges, preserving signal integrity and preventing transceiver latch-up. |
Use Scenario: Safeguarding analog input channels of PLC analog I/O modules connected to 24 V DC solenoid drivers. IC Role / Device Role / Timing Role: Standoff-clamp protector on field-side signal traces upstream of isolation barrier. Use Value: Absorbs 1500 W energy from coil de-energization without failure, maintaining measurement accuracy during repeated switching. |
| Consumer Power Adapter Input | Telecom Base Station DC Feeds |
Use Scenario: Secondary-side overvoltage suppression on 24 V output rails of switched-mode power adapters used in smart home hubs. IC Role / Device Role / Timing Role: Fast-response clamp parallel to bulk capacitor to suppress ringing and cross-regulation spikes. Use Value: Clamps 33 A surges within 45.7 V, preventing downstream DC-DC converter shutdown or MOSFET avalanche failure. |
Use Scenario: DC power feed protection in remote radio head (RRH) units where -48 V supply lines are susceptible to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-stage TVS on input bus prior to DC-DC conversion and battery backup circuits. Use Value: Withstands 1500 W pulses without degradation, meeting Telcordia GR-1089-CORE Level 3 surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/57T | Lower PPPM (400 W), same VWM (28.2 V), higher RθJA (110 °C/W), non-AEC-Q101 | Suitable for commercial-grade consumer electronics only; insufficient for automotive surge immunity compliance | Select SMAJ33A-E3/57T only for cost-sensitive, non-automotive designs with lower threat levels and no AEC requirement |
| 1.5KE33A | Through-hole DO-201 package, identical electrical specs but larger footprint and higher inductance; no AEC-Q101 variant available | Used in legacy industrial power supplies where board space and reflow compatibility are not constraints | Choose 1.5KE33A only for through-hole prototyping or repair of existing designs; not suitable for new SMT automotive platforms |
Compared with SMAJ33A-E3/57T and 1.5KE33A, SM15T33AHE3/57T delivers 3.75× higher surge power handling in a compact SMT package with automotive-grade qualification-enabling smaller PCB area, better high-frequency clamping, and guaranteed reliability in harsh environments.
Availability
SM15T33AHE3/57T is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O protection, and telecom DC power feed applications requiring stable component supply, AEC-Q101 traceability, and consistent surge performance across production lots.
Supply support for SM15T33AHE3/57T 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 designed specifically for high-energy transient suppression in automotive and industrial systems where 1500 W surge capability, AEC-Q101 compliance, and low-inductance SMC packaging are mandatory.
FAQ
What is the clamping voltage of SM15T33AHE3/57T at its rated peak pulse current?
The SM15T33AHE3/57T 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 with 8.0 mm × 8.0 mm copper pads per terminal and represents the highest voltage imposed on the protected circuit during worst-case surge events.
Is SM15T33AHE3/57T suitable for bidirectional transient protection?
No, SM15T33AHE3/57T is a unidirectional TVS diode, identified by the "A" suffix and cathode band marking. For bidirectional protection, Vishay offers the SM15T33CA variant with "CA" suffix; using SM15T33AHE3/57T in bidirectional applications would result in forward conduction during negative transients and potential failure.
Does SM15T33AHE3/57T meet automotive qualification standards?
Yes, SM15T33AHE3/57T is AEC-Q101 qualified, as confirmed by the "HE3" suffix in its part number. It undergoes rigorous stress testing-including temperature cycling, high-temperature reverse bias, and ESD-per AEC-Q101 Rev D, making it suitable for automotive powertrain, body, and ADAS applications.
What is the thermal resistance of SM15T33AHE3/57T, and how does it affect PCB layout?
The SM15T33AHE3/57T 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. Reducing pad size increases thermal resistance, causing higher junction temperatures during sustained power dissipation-so full-size pads are required to maintain rated 6.5 W power handling at 50 °C ambient.
How does the glass passivation in SM15T33AHE3/57T improve long-term reliability?
The glass passivated chip junction in SM15T33AHE3/57T prevents moisture ingress and surface contamination at the PN junction, reducing parameter drift and premature avalanche failure under humid or thermally cycled conditions. This construction is essential for achieving AEC-Q101 qualification and >10-year field life in automotive engine bay environments.
SM15T33AHE3/57T 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:
- 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)
SM15T33AHE3/57T FAQ
1.How can I place an order for SM15T33AHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T33AHE3/57T 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 SM15T33AHE3/57T reliable?
The price and inventory of SM15T33AHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T33AHE3/57T is usually 5 days.
3.What payment methods are accepted for SM15T33AHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T33AHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T33AHE3/57T?
SM15T33AHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T33AHE3/57T 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 SM15T33AHE3/57T?
For technical support, including SM15T33AHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T33AHE3/57T requirements.
6.How does Aetrix verify that SM15T33AHE3/57T is sourced from the original manufacturer or authorized distributors?
All SM15T33AHE3/57T 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 SM15T33AHE3/57T meets industry standards.
7.What is the process for return or replacement of SM15T33AHE3/57T?
All SM15T33AHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SM15T33AHE3/57T, 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 SM15T33AHE3/57T part is unused and in its original packaging.
Return procedure for SM15T33AHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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