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Vishay General Semiconductor - Diodes Division SM6T33A-M3/5B
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- Part No.:
- SM6T33A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T33A-M3/5B.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,836
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Product details
Overview
SM6T33A-M3/5B from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 33 V breakdown voltage (VBR = 31.4–34.7 V at 1.0 mA), 28.2 V stand-off voltage (VWM), 45.7 V maximum clamping voltage (VC) at 13.1 A peak pulse current, and 600 W peak pulse power (10/1000 μs). It is widely used to protect MOSFETs and sensor signal lines in automotive ECUs.
For engineers reviewing the SM6T33A-M3/5B datasheet, SM6T33A-M3/5B pinout, SM6T33A-M3/5B application, or SM6T33A-M3/5B equivalent, key selection criteria include unidirectional polarity, SMB package compatibility with automated SMT placement, AEC-Q101 qualification status (not applicable to this M3 suffix variant), and clamping performance under IEC 61000-4-5 surge conditions.
Technical Context
The SM6T33A-M3/5B operates as a silicon avalanche diode with glass-passivated junction, delivering precise reverse-breakdown behavior and low dynamic impedance during transient events. Its 10/1000 μs waveform response enables robust protection against inductive switching spikes and lightning-induced surges in DC power rails.
Thermal design is constrained by RθJA = 100 °C/W (typ.) and TJ(max) = 150 °C, requiring minimum 5.0 mm × 5.0 mm copper pad area per terminal for rated 600 W pulse handling. The device exhibits <1.0 μA reverse leakage at VWM, ensuring minimal standby power impact in always-on circuits.
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 overvoltage triggering |
| VWM | 28.2 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM | 45.7 V at 13.1 A (10/1000 μs) - clamped voltage seen by protected circuit during worst-case surge |
| PPPM | 600 W - peak transient power absorption capability without failure under standardized surge waveform |
| IFSM | 100 A - surge current rating for 10 ms half-sine wave, critical for inrush and fault-current immunity |
| TJ(max) | 150 °C - maximum junction temperature defining thermal derating envelope for sustained operation |
| Package | SMB (DO-214AA) - surface-mount outline with 2.20 mm max height, optimized for high-density PCB layouts |
Pinout & Package
SMB (DO-214AA) package: molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C reflow peak), cathode indicated by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient clamp anode connection | Connected to protected line; conducts during overvoltage to shunt current to ground |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return plane for effective clamping |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables single-device protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges on 12 V/24 V systems |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| Low inductance SMB package | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), improving clamping fidelity |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and automotive ELV directive compliance |
| Automated placement compatible | Standardized SMB footprint supports high-speed pick-and-place with >99.9% placement yield |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in body control modules against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between VIN and GND, activated within nanoseconds of overvoltage event. Use Value: Limits voltage to ≤45.7 V during 13.1 A surge, preventing damage to downstream LDOs and MCU VCC pins rated for 36 V absolute max. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Reverse-biased TVS across signal and return lines, conducting only during transient excursions beyond VWM. Use Value: Maintains <1.0 μA leakage at 28.2 V, preserving loop accuracy while clamping 8/20 μs ESD pulses to <59 V per datasheet. |
| Consumer Power Adapter Input Stage | Telecom DC Feeder Protection |
Use Scenario: Safeguarding primary-side controller ICs in offline AC/DC adapters against differential-mode surges coupled from mains input. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across bulk capacitor terminals to absorb energy from MOV-clamped line transients. Use Value: Withstands 100 A non-repetitive forward surge (IFSM), enabling robustness against repeated brownout recovery events. |
Use Scenario: Protecting PoE-powered equipment front-end rectifiers from induced surges on Ethernet cabling. IC Role / Device Role / Timing Role: Unidirectional clamping element on DC feed line, referenced to local ground plane. Use Value: Delivers 600 W pulse handling with RθJL = 20 °C/W, allowing efficient heat transfer to PCB copper during multi-pulse surge testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33A | Same VWM/VBR/VC specs but lower PPPM = 400 W; SMA package (larger footprint, higher RθJA) | Limited to lower-energy surge environments (e.g., IEC 61000-4-5 Level 2); not suitable for automotive load dump | Select when cost sensitivity outweighs surge margin and board space permits larger SMA outline |
| SMCJ33A | Higher PPPM = 1500 W; same VBR range; SMC package (DO-214AB), ~2× footprint area | Required for harsher industrial surge standards (e.g., EN 61000-4-4/5 Level 4+); adds mechanical robustness | Choose when system-level surge testing exceeds 600 W capability or extended thermal margin is needed |
Compared with SMAJ33A and SMCJ33A, the SM6T33A-M3/5B delivers optimal balance of 600 W surge capacity, SMB footprint density, and commercial-grade halogen-free compliance-making it ideal for space-constrained automotive and industrial control designs where full AEC-Q101 qualification is not mandated.
Availability
SM6T33A-M3/5B is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power feeders requiring stable component supply with consistent halogen-free compliance and tape-and-reel logistics.
Supply support for SM6T33A-M3/5B 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 optimization.
The SM6T Series is engineered for high-energy transient suppression in automotive, industrial, and consumer power systems-delivering precision clamping, low leakage, and automated assembly readiness in compact SMB packages.
FAQ
What is the polarity configuration of the SM6T33A-M3/5B?
The SM6T33A-M3/5B is a unidirectional transient voltage suppressor diode. Its cathode is marked by a band on the SMB package body, and it conducts only when the cathode is biased positively relative to the anode-making it suitable for DC rail protection where polarity is fixed. This differs from bidirectional variants (e.g., SM6T33CA) that suppress surges regardless of polarity.
Does the SM6T33A-M3/5B meet AEC-Q101 qualification?
No, the SM6T33A-M3/5B is not AEC-Q101 qualified. The "M3" suffix denotes halogen-free, RoHS-compliant commercial-grade construction. For AEC-Q101 qualification, Vishay specifies part numbers with "HM3" suffix (e.g., SM6T33AHM3_B/I), which undergo additional stress testing per automotive reliability standards.
What is the maximum clamping voltage of the SM6T33A-M3/5B under standard test conditions?
The SM6T33A-M3/5B has a maximum clamping voltage (VC) of 45.7 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 13.1 A. This value is measured per Figure 1 in Vishay document 88385 and defines the upper voltage limit imposed on protected circuitry during surge events.
Can the SM6T33A-M3/5B be used in bidirectional signal line protection?
No, the SM6T33A-M3/5B is unidirectional and unsuitable for bidirectional signal lines such as RS-485 or USB data pairs. For such applications, Vishay offers the SM6T33CA variant (with "CA" suffix), which provides symmetrical clamping in both directions and identical VBR and VC characteristics for positive and negative transients.
What PCB pad layout is recommended for optimal thermal performance of the SM6T33A-M3/5B?
Vishay specifies mounting the SM6T33A-M3/5B on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 600 W pulse power dissipation. Smaller pads increase thermal resistance and require derating per Figure 2 in document 88385-failure to follow this layout may cause premature thermal failure during repetitive surge events.
SM6T33A-M3/5B 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:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SM6T33A-M3/5B FAQ
1.How can I place an order for SM6T33A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T33A-M3/5B 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 SM6T33A-M3/5B reliable?
The price and inventory of SM6T33A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T33A-M3/5B is usually 5 days.
3.What payment methods are accepted for SM6T33A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T33A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T33A-M3/5B?
SM6T33A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T33A-M3/5B 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 SM6T33A-M3/5B?
For technical support, including SM6T33A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T33A-M3/5B requirements.
6.How does Aetrix verify that SM6T33A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SM6T33A-M3/5B 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 SM6T33A-M3/5B meets industry standards.
7.What is the process for return or replacement of SM6T33A-M3/5B?
All SM6T33A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SM6T33A-M3/5B, 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 SM6T33A-M3/5B part is unused and in its original packaging.
Return procedure for SM6T33A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T33A-M3/5B Tags
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