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Vishay General Semiconductor - Diodes Division SM6T33CAHM3_A/H
- Part No.:
- SM6T33CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33CAHM3_A/H.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,160
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Product details
Overview
SM6T33CAHM3_A/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, rated for 33 V standoff voltage (VWM), 37.1–41.0 V breakdown (VBR at 1 mA), and 600 W peak pulse power (10/1000 μs). It clamps transients to ≤59 V at 13.1 A, with <1.0 μA leakage at VWM, and is halogen-free, RoHS-compliant, and AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the SM6T33CAHM3_A/H datasheet, SM6T33CAHM3_A/H pinout, SM6T33CAHM3_A/H application, or SM6T33CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, 33 V working voltage tolerance, low clamping ratio (VC/VBR ≈ 1.58), and SMB package compatibility with automated SMT assembly.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering consistent clamping performance regardless of transient polarity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage, while the low-inductance SMB package supports fast response to sub-microsecond transients.
The device is designed for unclamped operation under normal bias and enters avalanche conduction only during overvoltage events. Thermal resistance (RθJA = 100 °C/W) and maximum junction temperature (150 °C) define its derating behavior above 25 °C ambient, with power dissipation limited to 5.0 W on infinite heatsink at 50 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 37.1 V / 41.0 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on margin above VWM |
| VC @ IPPM | 59 V at 13.1 A (10/1000 μs) - Clamping voltage limiting downstream IC stress during surge events |
| PPPM | 600 W - Peak transient energy absorption capacity per single 10/1000 μs pulse |
| ID @ VWM | <1.0 μA - Minimal leakage current preserving signal integrity and power efficiency |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical avalanche junction; conducts during negative transients |
| Cathode | Transient current entry (positive polarity) | Other terminal of symmetrical avalanche junction; conducts during positive transients |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when properly mounted |
| AEC-Q101 qualification | Validated for automotive subsystems including body control modules, sensor interfaces, and infotainment power rails |
| Low clamping ratio (VC/VBR ≈ 1.58) | Minimizes overvoltage overshoot during fast transients, reducing risk of MOSFET gate oxide failure |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity handling requirements |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine control units exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed at sensor connector interface to clamp ±100 V transients before reaching ADC input or signal conditioner. Use Value: Prevents sensor signal corruption and ADC saturation during ISO 7637-2 Pulse 5a (load dump), maintaining measurement accuracy and system uptime. | Use Scenario: Safeguarding differential CAN_H/CAN_L lines in vehicle telematics modules against ESD and coupled noise from adjacent high-power circuits. IC Role / Device Role / Timing Role: Symmetric clamping device installed across CAN bus pair to limit common-mode transients without disrupting DC bias or signal integrity. Use Value: Maintains CAN FD bit timing stability by limiting voltage excursion to <±60 V, avoiding recessive-to-dominant false triggering. |
| Consumer Power Adapter Input | Smart Meter Communication Port |
Use Scenario: Input-stage surge suppression on 24 V DC power inputs of home automation hubs subjected to lightning-induced surges via PoE or wall adapters. IC Role / Device Role / Timing Role: First-line TVS on DC input rail, coordinated with upstream fuse and downstream DC/DC converter input capacitors. Use Value: Absorbs 600 W pulses without degradation, enabling compliance with IEC 61000-4-5 Ed.3 Class B immunity requirements. | Use Scenario: Protecting RS-485 and PLC communication ports in utility smart meters deployed in electrically noisy substations and distribution panels. IC Role / Device Role / Timing Role: Bidirectional transient suppressor placed between transceiver and external wiring to shunt induced surges before entering PHY layer. Use Value: Ensures >100,000 surge cycles endurance per IEC 61000-4-5, supporting 15+ year field deployment without maintenance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33CA | Same VWM (33 V), lower PPPM (400 W), SMA package (larger RθJA = 150 °C/W) | Limited to lower-energy transients; less suitable for automotive load dump where 600 W margin is required | Choose SMAJ33CA only if board space allows larger SMA footprint and thermal budget permits higher junction rise |
| 1.5KE33CA | Higher PPPM (1500 W), axial DO-201 package, non-SMT, higher inductance | Not compatible with automated SMT assembly; unsuitable for high-frequency transient suppression due to lead inductance | Select 1.5KE33CA only for through-hole prototyping or legacy designs where rework tolerance outweighs performance loss |
Compared with SMAJ33CA and 1.5KE33CA, SM6T33CAHM3_A/H delivers optimal balance of 600 W surge capacity, SMB SMT compatibility, AEC-Q101 qualification, and low-profile packaging-making it the preferred choice for production automotive and industrial PCBs requiring validated reliability and automated manufacturability.
Availability
SM6T33CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, consumer power adapter inputs, and smart meter communication ports requiring stable component supply and long-term lifecycle support.
Supply support for SM6T33CAHM3_A/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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SM6T Series was developed to deliver AEC-Q101-qualified, high-power transient suppression in compact SMB packages for automotive and industrial systems demanding robust ESD and surge immunity without sacrificing SMT scalability.
FAQ
What is the clamping voltage of SM6T33CAHM3_A/H at its rated peak pulse current?
The SM6T33CAHM3_A/H clamps to a maximum of 59 V when subjected to a 13.1 A peak pulse current with a 10/1000 μs waveform. This value is measured per standard test conditions in the Vishay datasheet (Document Number: 88385) and reflects worst-case voltage seen by protected circuitry during surge events. The clamping performance remains consistent across both polarities due to its bidirectional design.
Is SM6T33CAHM3_A/H suitable for automotive applications?
Yes, SM6T33CAHM3_A/H is AEC-Q101 qualified and specifically designated for automotive use with the "HM3" suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It meets requirements for under-hood and cabin modules including sensor interfaces, body control units, and infotainment power supplies, with validated performance across -65 °C to +150 °C junction temperature range.
How does the SMB package of SM6T33CAHM3_A/H compare to SMA in terms of thermal performance?
The SMB package of SM6T33CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W, which is significantly lower than the ~150 °C/W of the SMA package used in alternatives like SMAJ33CA. This 33% improvement enables higher sustained power handling and better derating above 25 °C ambient, making SM6T33CAHM3_A/H more robust in thermally constrained automotive and industrial PCB layouts.
Does SM6T33CAHM3_A/H have polarity markings on the device body?
No, SM6T33CAHM3_A/H does not feature polarity markings because it is a bidirectional TVS diode. Unlike unidirectional variants (e.g., SM6T33A), which use a cathode band to indicate polarity, bidirectional types such as SM6T33CAHM3_A/H have symmetric electrical behavior and no functional anode/cathode distinction-eliminating the need for orientation-specific placement during SMT assembly.
What is the maximum reverse leakage current of SM6T33CAHM3_A/H at its standoff voltage?
The maximum reverse leakage current (ID) of SM6T33CAHM3_A/H is 1.0 μA when biased at its 33 V standoff voltage (VWM) and tested at 25 °C ambient. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes standby power loss in battery-operated systems, aligning with stringent requirements for automotive and industrial IoT endpoints.
SM6T33CAHM3_A/H 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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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 (SMB)
SM6T33CAHM3_A/H FAQ
1.How can I place an order for SM6T33CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33CAHM3_A/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 SM6T33CAHM3_A/H reliable?
The price and inventory of SM6T33CAHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T33CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SM6T33CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33CAHM3_A/H?
SM6T33CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33CAHM3_A/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 SM6T33CAHM3_A/H?
For technical support, including SM6T33CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33CAHM3_A/H requirements.
6.How does Aetrix verify that SM6T33CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SM6T33CAHM3_A/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 SM6T33CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SM6T33CAHM3_A/H?
All SM6T33CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33CAHM3_A/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 SM6T33CAHM3_A/H part is unused and in its original packaging.
Return procedure for SM6T33CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T33CAHM3_A/H Tags
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