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Vishay General Semiconductor - Diodes Division SM6T33AHM3_A/I
- Part No.:
- SM6T33AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33AHM3_A/I.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,757
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Product details
Overview
SM6T33AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount 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 max 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 signal lines in automotive sensor units against inductive switching transients.
For engineers reviewing the SM6T33AHM3_A/I datasheet, SM6T33AHM3_A/I pinout, SM6T33AHM3_A/I application, or SM6T33AHM3_A/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, SMB package thermal data, and direct alternative part comparisons for ESD and surge protection design-in.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, designed to shunt transient energy above VWM = 28.2 V while maintaining low leakage (<1.0 μA) below that threshold. Its glass-passivated junction ensures stable breakdown behavior under repetitive surge stress.
The device meets J-STD-020 MSL Level 1 (260 °C peak reflow), features matte tin-plated leads compliant with JESD 22-B102, and is halogen-free and RoHS-compliant per HM3 suffix designation. Junction temperature range spans −65 °C to +150 °C.
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 window for reliable overvoltage triggering |
| 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) - limits protected circuit voltage during worst-case surge |
| PPPM | 600 W - peak transient power handling capability under standardized surge waveform |
| TJ max | +150 °C - enables operation in under-hood automotive environments without derating |
| RθJA | 100 °C/W - thermal resistance informs PCB copper pad sizing for sustained power dissipation |
| AEC-Q101 | Qualified - certified for automotive-grade reliability per stress test requirements |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, with cathode band marking on unidirectional variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to system ground or low-impedance reference plane during clamping event |
| Cathode | Transient current input node | Connected to protected line (e.g., sensor supply or signal trace); band denotes this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Withstands high-energy surges common in automotive load-dump and ISO 7637-2 tests |
| Glass passivated chip junction | Ensures long-term parameter stability and reduced parameter drift under thermal cycling |
| Low inductance SMB package | Minimizes voltage overshoot during fast-rising transients (e.g., EFT bursts) |
| MSL Level 1 moisture sensitivity | Allows standard SMT reflow without baking or special handling |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental compliance requirements including ELV and REACH |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines of engine coolant temperature sensors exposed to load-dump transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between sensor VOUT and chassis ground. Use Value: Limits transient voltage to ≤45.7 V, preventing damage to downstream ADC inputs rated for 5 V or 3.3 V logic. | Use Scenario: Safeguarding 24 V digital input terminals of programmable logic controllers against field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff protector on dry-contact input lines, absorbing 600 W surges without latch-up. Use Value: Maintains <1.0 μA leakage at 28.2 V, ensuring clean logic-level detection during normal operation. |
| Consumer Power Adapter Interface | Telecom Line Card Surge Suppression |
Use Scenario: Clamping induced transients on USB-C VBUS lines during hot-plug events in wall adapters. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input rail upstream of buck converter. Use Value: Responds within nanoseconds to limit VBUS spikes to safe levels before IC-level protection triggers. | Use Scenario: Secondary surge suppression on Ethernet PHY power rails in PoE-powered line cards. IC Role / Device Role / Timing Role: Fast-reacting unidirectional suppressor on +3.3 V or +5 V bias rails feeding PHY ICs. Use Value: Withstands repeated 10/1000 μs surges up to 13.1 A without degradation, supporting Telcordia GR-1089 compliance. |
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 | Same VBR range (31.4–34.7 V), but lower PPPM = 400 W; SMA package (larger footprint, higher RθJA = 130 °C/W) | Not AEC-Q101 qualified; suitable only for commercial-grade non-automotive use | Select when cost sensitivity outweighs automotive qualification and surge margin |
| SMCJ33A | Higher PPPM = 1500 W; larger SMC package (DO-214AB); same VBR, VWM, VC specs | Used where higher surge immunity is required (e.g., industrial motor drives), but requires PCB layout change | Choose when system-level testing demands >600 W surge headroom and board space permits SMC footprint |
Compared with SMAJ33A and SMCJ33A, SM6T33AHM3_A/I delivers optimal balance of AEC-Q101 qualification, 600 W surge capability, and compact SMB footprint-enabling drop-in replacement in space-constrained automotive modules without sacrificing reliability or thermal performance.
Availability
SM6T33AHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor units, industrial PLC I/O modules, consumer power adapter interfaces, and telecom line card designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SM6T33AHM3_A/I 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 robust transient suppression in harsh environments-designed to meet AEC-Q101 and deliver consistent clamping performance across −65 °C to +150 °C junction temperature range.
FAQ
What is the clamping voltage of SM6T33AHM3_A/I at its rated peak pulse current?
The SM6T33AHM3_A/I has a maximum clamping voltage (VC) of 45.7 V when subjected to its rated peak pulse current of 13.1 A under the standard 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88385 and defines the upper voltage limit imposed on protected circuits during surge events. The SM6T33AHM3_A/I maintains this clamping performance across its qualified temperature range and after multiple surge cycles.
Is SM6T33AHM3_A/I qualified for automotive applications?
Yes, SM6T33AHM3_A/I is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's SM6T series datasheet (Rev. 09-Jan-2024, Doc. #88385). The HM3 designation indicates halogen-free, RoHS-compliant construction with full automotive stress testing-including temperature cycling, humidity bias HAST, and mechanical shock. This makes SM6T33AHM3_A/I suitable for under-hood and cabin-mounted automotive electronics.
What does the "_A/I" suffix mean in SM6T33AHM3_A/I?
The "_A/I" suffix in SM6T33AHM3_A/I denotes the revision code and packaging configuration: "A" is the revision identifier per Vishay's naming convention, and "I" specifies 13-inch diameter plastic tape-and-reel delivery (3200 units per reel). This matches ordering information in Table "ORDERING INFORMATION" on page 2 of document 88385, where HM3_B/I and HM3_A/I both indicate 13″ reels.
How does SM6T33AHM3_A/I differ from bidirectional SM6T33CA variants?
SM6T33AHM3_A/I is unidirectional, with polarity marked by a cathode band and specified parameters (VBR, VWM, VC) applying only in reverse bias. In contrast, SM6T33CA is bidirectional-lacking polarity marking and exhibiting symmetric clamping in both directions. The SM6T33AHM3_A/I cannot replace SM6T33CA in AC-coupled or dual-polarity signal paths without circuit redesign.
What is the thermal resistance from junction to ambient for SM6T33AHM3_A/I?
The typical junction-to-ambient thermal resistance (RθJA) for SM6T33AHM3_A/I is 100 °C/W, measured on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as stated in the Thermal Characteristics table of Vishay document 88385. This value guides PCB layout decisions-larger copper areas reduce effective RθJA, improving sustained power handling beyond the 5.0 W rated dissipation.
SM6T33AHM3_A/I 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/I FAQ
1.How can I place an order for SM6T33AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33AHM3_A/I 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/I reliable?
The price and inventory of SM6T33AHM3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for SM6T33AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33AHM3_A/I?
SM6T33AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33AHM3_A/I 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/I?
For technical support, including SM6T33AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33AHM3_A/I requirements.
6.How does Aetrix verify that SM6T33AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SM6T33AHM3_A/I 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/I meets industry standards.
7.What is the process for return or replacement of SM6T33AHM3_A/I?
All SM6T33AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33AHM3_A/I, 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/I part is unused and in its original packaging.
Return procedure for SM6T33AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T33AHM3_A/I Tags
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