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Vishay General Semiconductor - Diodes Division SM6T33AHE3/5B
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- Part No.:
- SM6T33AHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33AHE3/5B.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,351
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Product details
Overview
SM6T33AHE3/5B from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping ESD and surge transients on power/signal lines. It features 33 V standoff voltage (VWM = 28.2 V), 31.4–34.7 V breakdown (VBR at 1 mA), 45.7 V max clamping voltage at 13.1 A (10/1000 μs), 600 W peak pulse power, and AEC-Q101 qualification for automotive electronics protection.
For engineers reviewing the SM6T33AHE3/5B datasheet, SM6T33AHE3/5B pinout, SM6T33AHE3/5B application, or SM6T33AHE3/5B equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, IPPM derating above 25 °C, thermal resistance (RθJA = 100 °C/W), and AEC-Q101 compliance status for automotive-grade deployment.
Technical Context
This TVS operates as a unidirectional avalanche clamp: reverse-biased during normal operation with <1 μA leakage at 28.2 V, triggering into low-impedance conduction when transients exceed 31.4 V (min VBR). Its glass-passivated junction ensures stable breakdown and low inductance for fast response to sub-microsecond surges.
Designed for surface-mount placement on PCBs with 5.0 mm × 5.0 mm copper pads per terminal, it delivers 600 W peak pulse power under 10/1000 μs waveform while maintaining junction temperature ≤150 °C. The SMB package supports automated assembly and meets MSL Level 1 (260 °C reflow peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28.2 V - Maximum continuous reverse operating voltage before clamping begins; must be ≥ system nominal voltage to avoid leakage-induced power loss |
| VBR (min/max) | 31.4 V / 34.7 V at 1 mA - Confirmed avalanche breakdown range; defines minimum overvoltage threshold for reliable clamping activation |
| VC @ IPPM | 45.7 V at 13.1 A (10/1000 μs) - Clamped voltage seen by protected circuit during worst-case surge; must stay below downstream IC's absolute max rating |
| PPPM | 600 W - Peak transient power handling capability; determines survivability against IEC 61000-4-5 Level 4 (4 kV) surges with proper layout |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; requires ≥5.0 mm × 5.0 mm copper pad area per lead to sustain rated power without thermal runaway |
| TJ max | +150 °C - Maximum allowable junction temperature; enables operation in under-hood automotive environments with ambient up to +125 °C |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional polarity marked with cathode band. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); matte tin-plated leads, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / Surge return path | Connected to ground or low-impedance return plane; carries full transient current during clamping event |
| Cathode | Protected line connection / High-side clamp node | Connected to line being protected (e.g., 24 V supply rail); reverse-biased during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces requiring long-term reliability under thermal cycling and vibration |
| 600 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 combination wave surges up to 4 kV without degradation when mounted on recommended 5.0 mm × 5.0 mm copper pads |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes overvoltage stress on protected ICs-e.g., 45.7 V clamp vs. 33 V nominal rail leaves only 12.7 V margin above VBR |
| Glass passivated junction | Ensures stable VBR over lifetime and prevents parameter drift due to humidity or contamination in harsh industrial environments |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs of body control modules (BCM) against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 24 V rail and chassis ground to clamp positive-going surges above 33 V. Use Value: Limits transient voltage to ≤45.7 V, preventing damage to downstream DC/DC converters and microcontrollers rated for 40 V absolute max. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: TVS connected across signal and return lines to absorb ESD events and inductive kickback from nearby solenoid switching. Use Value: Maintains signal integrity by clamping transients within 1 ns response time, avoiding false triggers or ADC saturation in PLC input stages. |
| Telecom DC Power Input Protection | Consumer USB Power Delivery Line |
Use Scenario: Shielding -48 V telecom rectifier outputs from lightning-induced surges entering central office equipment. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to negative rail, absorbing positive transients on the -48 V bus. Use Value: Withstands 600 W pulses without failure, meeting Telcordia GR-1089-CORE Level 3 surge immunity requirements. | Use Scenario: Adding secondary overvoltage protection on VBUS lines of USB-C PD adapters where primary regulation may fail. IC Role / Device Role / Timing Role: Standby TVS between VBUS and GND, activated only during fault conditions exceeding 28.2 V. Use Value: Provides fail-safe shutdown margin beyond USB PD 3.0's 20 V max, ensuring no >45.7 V reaches connected devices during overvoltage faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5B | Same SMB package, 33 V VWM, but lower PPPM = 400 W and higher VC = 53.3 V at 7.5 A | Not AEC-Q101 qualified; suitable for commercial/industrial use only | Select when cost sensitivity outweighs automotive qualification and 400 W surge margin suffices |
| 1.5SMC33A | Larger SMC (DO-214AB) package, same 33 V rating, PPPM = 1500 W, VC = 53.3 V at 28.3 A | Higher power handling but 30% larger footprint; not optimized for dense automotive PCBs | Choose when system-level surge tests exceed IEC 61000-4-5 Level 4 and board space allows SMC outline |
Compared with SMAJ33A-E3/5B and 1.5SMC33A, SM6T33AHE3/5B uniquely balances AEC-Q101 compliance, SMB footprint, and 600 W capability-making it optimal for space-constrained automotive ECUs where qualification and moderate surge robustness are both mandatory.
Availability
SM6T33AHE3/5B is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom power supplies, and consumer USB PD protection requiring stable component supply with AEC-Q101 assurance.
Supply support for SM6T33AHE3/5B 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, MOSFETs, optoelectronics, and passive components with emphasis on high-reliability and automotive-grade solutions.
The SM6T Series was developed specifically for robust transient suppression in automotive and industrial environments, combining AEC-Q101 qualification, low-inductance SMB packaging, and precise clamping performance across 6.8 V to 220 V ratings.
FAQ
What is the clamping voltage of SM6T33AHE3/5B at its rated peak pulse current?
The SM6T33AHE3/5B has a maximum clamping voltage (VC) of 45.7 V when subjected to its peak pulse current (IPPM) of 13.1 A under the standard 10/1000 μs waveform. This value is measured at TA = 25 °C with devices mounted on 5.0 mm × 5.0 mm copper pads per terminal, and represents the upper voltage limit imposed on protected circuitry during surge events.
Is SM6T33AHE3/5B suitable for bidirectional transient protection?
No, SM6T33AHE3/5B is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional protection, Vishay offers the SM6T33CA variant (with "CA" suffix), which provides symmetrical clamping in both polarities and no polarity marking. Using SM6T33AHE3/5B for AC or bipolar signals would result in forward conduction during negative transients.
Does SM6T33AHE3/5B require derating at elevated ambient temperatures?
Yes, SM6T33AHE3/5B must be derated above TA = 25 °C per Figure 2 in the datasheet. Its peak pulse power (PPPM) decreases linearly to zero at TJ = 150 °C, with a typical derating factor of ~0.6% per °C above 25 °C. Layout with adequate copper area and airflow is essential to maintain performance in high-temperature automotive or industrial enclosures.
What does the "HE3" suffix signify in SM6T33AHE3/5B?
"HE3" denotes RoHS-compliant construction with AEC-Q101 qualification. The "H" prefix indicates automotive-grade qualification, "E3" confirms lead-free, RoHS-compliant terminations. Combined with "/5B", it specifies packaging in 13-inch tape-and-reel format with 3200 units per reel-ensuring traceability and suitability for automotive production lines.
How does the thermal resistance of SM6T33AHE3/5B affect PCB layout?
The SM6T33AHE3/5B has RθJA = 100 °C/W, meaning junction temperature rises 100 °C per watt dissipated without heatsinking. To sustain its 5.0 W steady-state power rating or 600 W transient capability, PCB layout must provide minimum 5.0 mm × 5.0 mm copper pads per terminal, with internal ground/power planes connected via multiple vias to maximize heat spreading and minimize thermal impedance.
SM6T33AHE3/5B 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:
- 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):
- 13.1A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SM6T33AHE3/5B FAQ
1.How can I place an order for SM6T33AHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33AHE3/5B 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 SM6T33AHE3/5B reliable?
The price and inventory of SM6T33AHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T33AHE3/5B is usually 5 days.
3.What payment methods are accepted for SM6T33AHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33AHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33AHE3/5B?
SM6T33AHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33AHE3/5B 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 SM6T33AHE3/5B?
For technical support, including SM6T33AHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33AHE3/5B requirements.
6.How does Aetrix verify that SM6T33AHE3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T33AHE3/5B 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 SM6T33AHE3/5B meets industry standards.
7.What is the process for return or replacement of SM6T33AHE3/5B?
All SM6T33AHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33AHE3/5B, 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 SM6T33AHE3/5B part is unused and in its original packaging.
Return procedure for SM6T33AHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T33AHE3/5B Tags
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