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Vishay General Semiconductor - Diodes Division SM6T33AHM3_B/H
- Part No.:
- SM6T33AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33AHM3_B/H.pdf
- Description:
- 600W,33V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,976
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Product details
Overview
SM6T33AHM3_B/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 33 V breakdown voltage (VBR = 31.4–34.7 V at 1.0 mA), 600 W peak pulse power (10/1000 μs), 45.7 V maximum clamping voltage at 13.1 A, and AEC-Q101 qualified for automotive use. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and ESD in automotive powertrain control units.
For engineers reviewing the SM6T33AHM3_B/H datasheet, SM6T33AHM3_B/H pinout, SM6T33AHM3_B/H application, or SM6T33AHM3_B/H equivalent, key selection criteria include its 33 V standoff capability, low clamping ratio (VC/VBR ≈ 1.45), halogen-free RoHS-compliant construction, and qualification to AEC-Q101 for under-hood electronics.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, designed to shunt transient energy away from sensitive downstream circuitry during overvoltage events. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 μA at 28.2 V).
The device delivers 600 W peak pulse power per 10/1000 μs waveform when mounted on 5.0 mm × 5.0 mm copper pads, with thermal resistance RθJA = 100 °C/W and RθJL = 20 °C/W, enabling reliable operation up to TJ = 150 °C in compact automotive PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at 1.0 mA - defines precise clamping onset threshold for 33 V nominal systems |
| VWM | 28.2 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 μA |
| VC @ IPPM | 45.7 V at 13.1 A - limits voltage seen by protected IC during 600 W transient event |
| PPPM | 600 W (10/1000 μs) - sustains high-energy surges common in automotive load-dump and inductive kick scenarios |
| TJ max. | +150 °C - supports under-hood placement without derating in engine control modules |
| AEC-Q101 | Qualified - validated for automotive reliability including temperature cycling, HTRB, and ESD testing |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with automated assembly and IPC-7351B standard pad layout |
Pinout & Package
SMB (DO-214AA) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated, 0.220" × 0.130" outline, cathode band marking on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to system ground or low-impedance return plane to complete clamping loop |
| Cathode | Transient current input node | Connected to protected line (e.g., CAN_H, LIN, sensor supply); band denotes this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables robust protection against ISO 7637-2 Pulse 1/2a/5a transients in 12 V automotive systems |
| Glass passivated junction | Ensures stable VBR tolerance (±5%) and <1.0 μA leakage at VWM, critical for low-power sensor interfaces |
| AEC-Q101 qualification | Validates reliability for automotive applications including powertrain, body control, and ADAS modules |
| Halogen-free & RoHS-compliant | Meets automotive OEM material compliance requirements (e.g., GMW3172, Ford WSS-M99P9999-A1) |
| Low inductance SMB package | Minimizes voltage overshoot during fast transients (e.g., ESD ±30 kV contact discharge) |
Applications
| Automotive Powertrain Control | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting microcontroller I/O and gate drivers in engine control units exposed to load-dump (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between 12 V supply rail and ground, triggered within nanoseconds of overvoltage onset. Use Value: Limits transient voltage to ≤45.7 V, preventing latch-up or permanent damage to 33 V-rated power management ICs. | Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors in factory automation PLCs subject to relay coil flyback. IC Role / Device Role / Timing Role: Standoff-mode protector on signal lines, conducting only during >28.2 V excursions with sub-μs response. Use Value: Maintains signal integrity with <1.0 μA leakage at 28.2 V, avoiding DC offset errors in 24 V industrial sensor loops. |
| Automotive Body Electronics | Telecom Line Interface |
Use Scenario: Shielding LIN bus transceivers and LED driver ICs in door module ECUs from battery reverse-polarity and jump-start surges. IC Role / Device Role / Timing Role: Cathode-connected to LIN line, anode to ground; clamps negative transients via forward conduction and positive transients via avalanche. Use Value: Withstands 100 A IFSM (10 ms half-sine), surviving repeated jump-start events without degradation. | Use Scenario: Protecting Ethernet PHY power rails (3.3 V/5 V) in base station remote radio units exposed to lightning-induced surges on auxiliary power feeds. IC Role / Device Role / Timing Role: Secondary-level TVS staged after primary GDT or MOV, providing precise 33 V clamping for low-voltage logic rails. Use Value: Achieves 45.7 V clamping at 13.1 A, ensuring downstream DC-DC converters remain within absolute maximum ratings. |
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 VBR, but 400 W PPPM (vs. 600 W), non-AEC-Q101, commercial grade only | Lacks automotive qualification; suitable for industrial/commercial designs without AEC requirements | Select when cost sensitivity outweighs need for 600 W surge margin or automotive qualification |
| SMCJ33A-QH | Higher 1500 W PPPM, SMC (DO-214AB) package (larger footprint), AEC-Q101 qualified | Requires PCB redesign due to larger SMC package; used where higher surge immunity is mandatory | Select when system-level testing requires >600 W immunity (e.g., heavy-duty truck 24 V systems) |
Compared with SMAJ33A-E3/5B and SMCJ33A-QH, SM6T33AHM3_B/H uniquely balances 600 W surge capability, AEC-Q101 qualification, SMB footprint, and halogen-free compliance-making it optimal for space-constrained automotive ECUs requiring production-grade reliability without board rework.
Availability
SM6T33AHM3_B/H is available at Aetrix Electronics and suitable for automotive powertrain control, industrial sensor interface protection, and telecom line interface applications requiring stable component supply across extended production lifecycles.
Supply support for SM6T33AHM3_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 high-reliability, automotive-qualified components.
The SM6T Series is engineered specifically for transient overvoltage protection in harsh environments, targeting automotive, industrial, and telecom applications where robustness, precision clamping, and long-term stability are critical.
FAQ
What is the clamping voltage of SM6T33AHM3_B/H at its rated peak pulse current?
The SM6T33AHM3_B/H has a maximum clamping voltage (VC) of 45.7 V at 13.1 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value is measured per JEDEC standards and ensures protected circuits remain below critical voltage thresholds during surge events. The clamping ratio (VC/VBR) is approximately 1.45, confirming efficient transient suppression. SM6T33AHM3_B/H maintains this performance across its full operating temperature range.
Is SM6T33AHM3_B/H suitable for automotive applications?
Yes, SM6T33AHM3_B/H is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials, making it suitable for automotive applications including engine control units, body electronics, and ADAS subsystems. Its qualification covers temperature cycling, highly accelerated life testing, and ESD robustness. SM6T33AHM3_B/H is explicitly designated for automotive use via the "HM3" suffix and "_B/H" reel packaging code per Vishay's ordering nomenclature.
What does the "HM3" suffix indicate in SM6T33AHM3_B/H?
The "HM3" suffix in SM6T33AHM3_B/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's documentation, "M3" indicates halogen-free commercial grade, and "H" in the prefix position (as in HM3) confirms AEC-Q101 qualification. The "_B/H" further specifies 7" tape-and-reel packaging (H = 7" reel). SM6T33AHM3_B/H thus combines automotive reliability, environmental compliance, and standardized logistics formatting.
How does SM6T33AHM3_B/H differ from bidirectional TVS diodes like SM6T33CA?
SM6T33AHM3_B/H is unidirectional, featuring a cathode band and functioning as a Zener-like clamp only in reverse bias (with forward conduction during negative transients). In contrast, SM6T33CA is bidirectional, symmetrically clamping both polarities without polarity marking. SM6T33AHM3_B/H offers lower leakage (<1.0 μA at 28.2 V) and is preferred for DC-biased lines like power rails; SM6T33CA suits AC-coupled or floating signal lines such as data buses. Their package and VBR are identical, but electrical behavior differs fundamentally.
What is the thermal resistance of SM6T33AHM3_B/H, and how does it affect PCB layout?
SM6T33AHM3_B/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain TJ ≤ 150 °C under 5.0 W steady-state dissipation, designers must provide adequate copper area and avoid thermal bottlenecks. SM6T33AHM3_B/H requires adherence to Vishay's recommended pad layout to achieve rated power handling and reliability.
SM6T33AHM3_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)
SM6T33AHM3_B/H FAQ
1.How can I place an order for SM6T33AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33AHM3_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 SM6T33AHM3_B/H reliable?
The price and inventory of SM6T33AHM3_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 SM6T33AHM3_B/H is usually 5 days.
3.What payment methods are accepted for SM6T33AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33AHM3_B/H?
SM6T33AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33AHM3_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 SM6T33AHM3_B/H?
For technical support, including SM6T33AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33AHM3_B/H requirements.
6.How does Aetrix verify that SM6T33AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SM6T33AHM3_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 SM6T33AHM3_B/H meets industry standards.
7.What is the process for return or replacement of SM6T33AHM3_B/H?
All SM6T33AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33AHM3_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 SM6T33AHM3_B/H part is unused and in its original packaging.
Return procedure for SM6T33AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T33AHM3_B/H Tags
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