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Vishay General Semiconductor - Diodes Division SM6T33AHM3_A/H
- Part No.:
- SM6T33AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33AHM3_A/H.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,704
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Product details
Overview
SM6T33AHM3_A/H from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, with 33 V breakdown voltage (VBR = 31.4–34.7 V at 1.0 mA), 28.2 V stand-off voltage (VWM), 45.7 V clamping voltage (VC) at 13.1 A peak pulse current, and 600 W peak pulse power rating per 10/1000 μs waveform. It protects MOSFETs and ICs against inductive switching transients in automotive sensor signal lines.
For engineers reviewing the SM6T33AHM3_A/H datasheet, SM6T33AHM3_A/H pinout, SM6T33AHM3_A/H application, or SM6T33AHM3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, halogen-free RoHS compliance, low clamping ratio (VC/VBR ≈ 1.42), and SMB thermal resistance (RθJA = 100 °C/W).
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal bias it presents high impedance (<1.0 μA leakage at 28.2 V), then rapidly avalanches to limit transient overvoltage across protected circuit nodes. Its glass-passivated junction ensures stable breakdown and low inductance for fast response to sub-microsecond transients.
Designed for surface-mount automated placement on PCBs with 0.2" × 0.2" copper pads per terminal, it meets MSL Level 1 (260 °C reflow peak) and supports junction temperatures from –65 °C to +150 °C. The cathode band denotes polarity; no marking on bidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.4 V / 34.7 V at 1.0 mA - defines precise avalanche onset threshold for reliable clamping initiation |
| VWM | 28.2 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 μA |
| VC @ IPPM | 45.7 V at 13.1 A (10/1000 μs) - actual clamped voltage seen by protected IC during worst-case surge |
| PPPM | 600 W - peak transient energy absorption capability without failure under standardized surge waveform |
| RθJA | 100 °C/W - thermal resistance from junction to ambient, determines derating above 25 °C ambient |
| TJ range | –65 °C to +150 °C - operational and storage temperature envelope compatible with under-hood automotive environments |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Cathode indicated by molded band on case body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (unidirectional) | Connected to ground or low-impedance return path; carries full surge current during clamping |
| Cathode | Protected node connection | Connected to line being protected (e.g., sensor output); voltage referenced to anode during clamping |
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 |
| AEC-Q101 qualification | Validated reliability for automotive powertrain, chassis, and ADAS sensor modules |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage stress on downstream ICs while maintaining margin above VWM |
| MSL Level 1 moisture sensitivity | Allows standard SMT reflow without baking, reducing manufacturing overhead |
| Glass-passivated junction | Ensures stable VBR over time and temperature, critical for long-life automotive deployments |
Applications
| Automotive Sensor Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine control units exposed to load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between sensor output and ground, clamping transients before they reach ADC input or op-amp buffer. Use Value: Limits voltage to ≤45.7 V during 13.1 A surge, preserving signal integrity and preventing latch-up in 3.3 V or 5 V interface ICs. | Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers subject to relay coil flyback and ESD events. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across input terminals to divert surges away from optocoupler or Schmitt trigger inputs. Use Value: Withstands repeated 600 W pulses without degradation, supporting >100,000 switching cycles in factory automation environments. |
| Consumer Power Adapter Surge Suppression | Telecom Line Interface Protection |
Use Scenario: Secondary-side transient suppression in AC/DC adapters for USB-C PD chargers subjected to conducted noise from mains switching. IC Role / Device Role / Timing Role: Clamping device placed across DC output rails to prevent overvoltage damage to USB controller ICs and battery management circuits. Use Value: Fast avalanche response (<1 ns) and low dynamic impedance ensure <50 V clamping even during 10/1000 μs surges up to 13.1 A. | Use Scenario: Protecting RS-485 transceiver pins in base station backhaul equipment located near lightning-prone outdoor cabinets. IC Role / Device Role / Timing Role: Unidirectional TVS on driver/receiver signal lines referenced to local ground plane, absorbing induced surges from nearby strikes. Use Value: 45.7 V clamping voltage maintains compatibility with ±7 V RS-485 common-mode range while surviving 600 W line-to-ground transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A-E3/5B | Same VBR range (31.4–34.7 V), but SMA package (higher RθJA = 140 °C/W), non-AEC-Q101, RoHS-compliant only | Limited to commercial-grade industrial or consumer use; not qualified for automotive under-hood deployment | Select when cost or legacy footprint compatibility outweighs AEC-Q101 requirement and thermal derating is acceptable |
| 1.5SMC33A | Same electrical specs, but larger SMC (DO-214AB) package (RθJA = 70 °C/W), higher IFSM (200 A), no AEC-Q101 option | Better thermal performance for high-duty-cycle surges; lacks automotive qualification and halogen-free certification | Choose for high-reliability industrial power supplies where board space allows SMC and AEC-Q101 is unnecessary |
Compared with SMAJ33A-E3/5B and 1.5SMC33A, SM6T33AHM3_A/H uniquely combines AEC-Q101 qualification, halogen-free construction, SMB footprint, and 100 °C/W thermal resistance-making it optimal for space-constrained automotive sensor modules requiring production-grade reliability and regulatory compliance.
Availability
SM6T33AHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC inputs, consumer power adapter secondary-side protection, and telecom RS-485 line interfaces requiring stable component supply across multi-year production programs.
Supply support for SM6T33AHM3_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, MOSFETs, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SM6T Series is designed specifically for robust transient voltage suppression in harsh environments-including automotive, industrial, and telecom-where high peak power handling, low clamping, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of the SM6T33AHM3_A/H under a 10/1000 μs surge?
The SM6T33AHM3_A/H has a maximum clamping voltage (VC) of 45.7 V at 13.1 A peak pulse current with a 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88385 and reflects the actual voltage imposed on protected circuitry during standardized transient events. The SM6T33AHM3_A/H maintains this clamping performance across its specified operating temperature range.
Is the SM6T33AHM3_A/H qualified for automotive applications?
Yes, the SM6T33AHM3_A/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's SM6T series datasheet (Rev. 09-Jan-2024, Doc. #88385). This qualification covers stress tests including HTGB, HTRB, TCT, and mechanical shock, validating its suitability for automotive powertrain, chassis, and ADAS sensor modules. The SM6T33AHM3_A/H meets all requirements for under-hood deployment.
What does the "HM3" suffix indicate in SM6T33AHM3_A/H?
The "HM3" suffix in SM6T33AHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information table, HM3 parts use lead-free matte tin plating and meet JESD201 Class 2 whisker resistance. The "_A/H" indicates revision A in 7" tape-and-reel packaging (750 units per reel). The SM6T33AHM3_A/H is not a commercial-grade variant-it is fully automotive-qualified.
What is the standoff voltage (VWM) of the SM6T33AHM3_A/H?
The standoff voltage (VWM) of the SM6T33AHM3_A/H is 28.2 V, meaning it remains non-conductive with ≤1.0 μA reverse leakage current up to this DC or RMS voltage. This value provides a safe margin below the 31.4 V minimum breakdown voltage (VBR) and ensures compatibility with 24 V automotive and industrial systems. The SM6T33AHM3_A/H reliably blocks normal operating voltages while responding instantly to overvoltage events exceeding VWM.
How does the SMB package of the SM6T33AHM3_A/H affect thermal performance?
The SMB (DO-214AA) package of the SM6T33AHM3_A/H delivers a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads. This enables effective heat dissipation during repetitive surge events but requires layout adherence to Vishay's recommended pad dimensions. Compared to larger packages like SMC, the SMB offers space savings at the cost of higher thermal resistance-making the SM6T33AHM3_A/H ideal for compact automotive sensor PCBs where area is constrained.
SM6T33AHM3_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:
- 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 (SMB)
SM6T33AHM3_A/H FAQ
1.How can I place an order for SM6T33AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33AHM3_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 SM6T33AHM3_A/H reliable?
The price and inventory of SM6T33AHM3_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 SM6T33AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SM6T33AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33AHM3_A/H?
SM6T33AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33AHM3_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 SM6T33AHM3_A/H?
For technical support, including SM6T33AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33AHM3_A/H requirements.
6.How does Aetrix verify that SM6T33AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SM6T33AHM3_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 SM6T33AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SM6T33AHM3_A/H?
All SM6T33AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33AHM3_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 SM6T33AHM3_A/H part is unused and in its original packaging.
Return procedure for SM6T33AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T33AHM3_A/H Tags
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