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Vishay General Semiconductor - Diodes Division SM6T33AHE3_B/H
- Part No.:
- SM6T33AHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33AHE3_B/H.pdf
- Description:
- 600W,33V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,641
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Product details
Overview
SM6T33AHE3_B/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 33 V standoff voltage (VWM = 28.2 V), 45.7 V clamping voltage at 13.1 A peak pulse current, and 600 W peak pulse power with 10/1000 μs waveform. It features AEC-Q101 qualification, RoHS compliance, and low-inductance design for automotive-grade ESD and surge protection on power rails and signal lines.
For engineers reviewing the SM6T33AHE3_B/H datasheet, SM6T33AHE3_B/H pinout, SM6T33AHE3_B/H application, or SM6T33AHE3_B/H equivalent, key selection criteria include clamping performance under 10/1000 μs transients, junction temperature derating above 25 °C, unidirectional polarity marking, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
The SM6T33AHE3_B/H operates as a unidirectional avalanche diode with glass-passivated junction, designed to clamp transient overvoltages before they damage downstream ICs or MOSFETs. Its breakdown voltage is specified at 31.4–34.7 V (min/max) with 1 mA test current, and it maintains stable clamping up to 150 °C junction temperature.
Thermal resistance is 100 °C/W (junction-to-ambient, typical) and 20 °C/W (junction-to-lead), enabling reliable operation under repetitive surge conditions when mounted per recommended pad layout. It meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 28.2 V - Maximum continuous reverse voltage before significant leakage; defines operating rail margin before clamping initiates |
| VBR (Breakdown Voltage) | 31.4–34.7 V at 1 mA - Avalanche onset range; ensures predictable turn-on during fast transients |
| VC (Clamping Voltage) | 45.7 V at 13.1 A (10/1000 μs) - Peak voltage seen by protected circuit during worst-case surge |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy absorption capability for standardized lightning/surge waveforms |
| TJ max. | +150 °C - Maximum junction temperature; supports under-hood automotive environments |
| RθJA | 100 °C/W - Thermal resistance defining self-heating under DC bias or low-duty-cycle pulses |
| AEC-Q101 Qualified | Yes - Validated for automotive electronics per stress test requirements including HTOL, TC, HTRB |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, cathode-band marked unidirectional configuration. 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 |
|---|---|---|
| Cathode (banded end) | Anode of internal PN junction | Connected to protected line; clamps positive transients to ground when referenced to anode |
| Anode | Cathode of internal PN junction | Typically tied to system ground or low-impedance return path; completes clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges without derating at TA ≤ 25 °C |
| AEC-Q101 qualified | Validated for automotive powertrain, body control, and ADAS modules requiring long-term reliability under thermal cycling and humidity |
| Low inductance SMB package | Minimizes voltage overshoot during nanosecond-scale transients, critical for protecting high-speed logic and gate drivers |
| Glass passivated chip junction | Ensures stable leakage current (<1 μA at VWM) and long-term stability under humid or high-bias stress conditions |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without preconditioning; eliminates moisture-related popcorning risk |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-supplied ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp positive surges above 28.2 V. Use Value: Limits voltage to ≤45.7 V during 13.1 A 10/1000 μs surge, preventing damage to MCU power inputs and CAN transceivers. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS connected across differential pair or single-ended output to ground to absorb ±8 kV contact ESD per IEC 61000-4-2. Use Value: Clamps transients within <1 ns, preserving signal integrity while maintaining <1 μA leakage at 28.2 V operating voltage. |
| Consumer Power Adapter Input Stage | Telecom Line Card Surge Suppression |
Use Scenario: Secondary-side DC input protection in USB-C PD adapters subject to hot-plug and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS on +5 V/+9 V/+15 V rails to suppress switching noise and fault-induced spikes. Use Value: Withstands 100 A non-repetitive forward surge (IFSM), ensuring survival during accidental short-circuit recovery events. |
Use Scenario: Front-end protection on Ethernet PHY power and data lines exposed to lightning-induced surges. IC Role / Device Role / Timing Role: TVS array component used in conjunction with common-mode chokes to meet GR-1089-CORE Level 4 immunity. Use Value: Delivers 600 W pulse handling with 100 °C/W RθJA, enabling compact board layout without forced airflow or heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/52 | Same SMB package, 33 V VWM, but lower PPPM (400 W), higher VC (53.3 V at 7.5 A), no AEC-Q101 qualification | Commercial-grade only; unsuitable for automotive under-hood use due to missing qualification and reduced surge margin | Select when cost sensitivity outweighs automotive qualification and 600 W surge headroom is not required |
| 1.5SMC33A | Same electrical specs (VWM = 28.2 V, VC = 45.7 V), but larger SMC (DO-214AB) package (7.11 mm × 6.22 mm), higher RθJA (60 °C/W) | Requires more PCB area; better thermal dissipation under sustained DC bias but less suitable for dense automotive modules | Select when board space permits and higher steady-state power dissipation (PD = 5.0 W) must be managed with passive cooling |
Compared with SMAJ33A-E3/52 and 1.5SMC33A, the SM6T33AHE3_B/H uniquely combines AEC-Q101 qualification, 600 W pulse rating, and SMB footprint-enabling automotive-compliant surge protection in space-constrained layouts without sacrificing clamping performance or thermal robustness.
Availability
SM6T33AHE3_B/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom line card designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM6T33AHE3_B/H 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SM6T Series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and communications systems where AEC-Q101 compliance and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of the SM6T33AHE3_B/H under a 10/1000 μs surge?
The SM6T33AHE3_B/H has a maximum clamping voltage (VC) of 45.7 V when subjected to a 13.1 A peak pulse current with a 10/1000 μs waveform. This value is measured per Figure 1 in the official Vishay datasheet (Document Number: 88385) and defines the upper voltage limit imposed on protected circuits during standardized surge events.
Is the SM6T33AHE3_B/H suitable for automotive applications?
Yes, the SM6T33AHE3_B/H is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix. It undergoes stress testing for high-temperature operating life, temperature cycling, and humidity bias, making it appropriate for engine control units, body electronics, and ADAS modules where reliability under thermal and mechanical stress is critical.
What does the "_B/H" suffix in SM6T33AHE3_B/H indicate?
The "_B/H" suffix denotes packaging configuration: "B" indicates revision code B per Vishay's material categorization, and "H" specifies the preferred package code for 7-inch plastic tape-and-reel delivery with 750 units per reel. This matches ordering information in the SM6T datasheet (page 2, Ordering Information table).
How does the SM6T33AHE3_B/H differ from bidirectional variants like SM6T33CA?
The SM6T33AHE3_B/H is unidirectional and features a cathode band for polarity identification; it clamps only positive transients relative to ground. In contrast, SM6T33CA is bidirectional, lacks polarity marking, and clamps both polarities symmetrically-making it suitable for AC lines or differential signals where voltage reversal occurs.
What is the maximum operating temperature for the SM6T33AHE3_B/H?
The SM6T33AHE3_B/H has a maximum junction temperature (TJ max.) of +150 °C, verified per Vishay's thermal characterization. This allows continuous operation in under-hood automotive environments and industrial enclosures where ambient temperatures exceed 105 °C, provided PCB thermal design meets the 5.0 mm × 5.0 mm copper pad requirement.
SM6T33AHE3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SM6T33AHE3_B/H FAQ
1.How can I place an order for SM6T33AHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33AHE3_B/H 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_B/H reliable?
The price and inventory of SM6T33AHE3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T33AHE3_B/H is usually 5 days.
3.What payment methods are accepted for SM6T33AHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33AHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33AHE3_B/H?
SM6T33AHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33AHE3_B/H 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_B/H?
For technical support, including SM6T33AHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33AHE3_B/H requirements.
6.How does Aetrix verify that SM6T33AHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SM6T33AHE3_B/H 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_B/H meets industry standards.
7.What is the process for return or replacement of SM6T33AHE3_B/H?
All SM6T33AHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33AHE3_B/H, 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_B/H part is unused and in its original packaging.
Return procedure for SM6T33AHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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