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Vishay General Semiconductor - Diodes Division SMA6F33A-M3/I
- Part No.:
- SMA6F33A-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F33A-M3/I.pdf
- Description:
- 600W,33V 5%,UNIDIR,SLIM SMA TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,541
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Product details
Overview
SMA6F33A-M3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) in SlimSMA (DO-221AC) package, designed for clamping voltage transients on power and signal lines. It features 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.1 V max clamping voltage at 10/1000 μs 11.3 A pulse, 600 W peak pulse power, and IEC 61000-4-2 Level 4 ESD protection (15 kV air / 8 kV contact). It is used to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMA6F33A-M3/I datasheet, SMA6F33A-M3/I pinout, SMA6F33A-M3/I application, or SMA6F33A-M3/I equivalent, key selection criteria include unidirectional polarity, SlimSMA footprint compatibility, clamping performance under 10/1000 μs and 8/20 μs surges, thermal derating above 25 °C, and compliance with J-STD-020 MSL level 1 and JESD201 class 2 whisker resistance.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert surge current away from downstream circuitry. Its low dynamic resistance (1.11 Ω) ensures tight clamping control, while its 175 °C max junction temperature supports operation in thermally demanding environments.
The device uses silicon avalanche technology with a Zener-regulated breakdown mechanism and exhibits a positive voltage temperature coefficient (αT = 10.0 × 10⁻⁴ /°C), meaning VBR increases linearly with junction temperature-critical for accurate clamping prediction across operating ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - maximum continuous reverse operating voltage before significant leakage begins |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - defines reliable avalanche initiation window for predictable clamping onset |
| VC @ IPPM (10/1000 μs) | 53.1 V at 11.3 A - maximum clamped voltage seen by protected circuit during standard lightning surge test |
| PPPM (10/1000 μs) | 600 W - surge energy handling capability under IEC 61000-4-5 long-duration waveform |
| RD | 1.11 Ω - low dynamic resistance enables stable clamping with minimal voltage rise under increasing current |
| ESD Rating | IEC 61000-4-2 Level 4: 15 kV air / 8 kV contact - qualifies for robust system-level ESD immunity without additional protection layers |
| MSL Level | Level 1 per J-STD-020 - supports lead-free reflow up to 260 °C peak without moisture-induced failure |
Pinout & Package
Package: SlimSMA (DO-221AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Height: 0.95 mm typical. Polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or surge shunting | Connected to protected line's lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line's higher-potential side (e.g., VCC or signal rail); marked with color band |
Key Features
| Feature | Design Value |
|---|---|
| Very low profile (0.95 mm height) | Enables use in ultra-thin consumer and portable electronics where board space and component height are constrained |
| Peak pulse power: 600 W (10/1000 μs) | Provides robust protection against common industrial switching transients and induced surges without requiring oversized devices |
| ESD capability: IEC 61000-4-2 Level 4 | Eliminates need for secondary ESD protection on exposed ports in end-user-facing equipment |
| Unidirectional polarity | Optimized for DC-biased lines (e.g., power rails, digital I/O), avoiding forward-conduction losses on AC-coupled signals |
| MSL Level 1, LF peak 260 °C | Supports high-yield, single-pass lead-free reflow assembly without baking or special handling |
Applications
| Industrial Motor Control | Telecom Power Supply Input |
|---|---|
Use Scenario: Protecting gate drivers and microcontrollers from inductive kickback during relay or solenoid switching in PLC modules. IC Role / Device Role / Timing Role: Shunt clamping element placed across DC bus or logic supply rail to clamp transients below IC absolute maximum ratings. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic ICs by limiting transient excursions to ≤53.1 V with sub-μs response. | Use Scenario: Safeguarding primary-side controller ICs and rectifier bridges against line surges entering via AC/DC adapter inputs. IC Role / Device Role / Timing Role: First-line transient suppression on input bulk capacitor node, absorbing 600 W surges before they reach downstream regulators. Use Value: Maintains system uptime by surviving repeated 10/1000 μs surges up to 600 W without degradation, per IEC 61000-4-5 compliance. |
| Automotive Body Control Module | IoT Sensor Node Interface |
Use Scenario: Shielding LIN bus transceivers and MCU GPIOs from load-dump and jump-start transients in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between LIN line and ground, leveraging 33 V VWM to avoid false triggering during normal 12 V operation. Use Value: Ensures >100,000 surge cycles without parameter shift, validated per AEC-Q101 stress requirements for automotive-grade reliability. | Use Scenario: Protecting analog front-end ADC inputs and I²C lines of environmental sensors exposed to ESD during field servicing or handling. IC Role / Device Role / Timing Role: Localized ESD clamp at connector or PCB edge, directly shunting human-body-model discharges before reaching sensitive analog circuitry. Use Value: Delivers certified 15 kV air / 8 kV contact ESD immunity without adding capacitance that would degrade 100 kHz sensor bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6F33A-M3/H | Identical electrical specs; differs only in tape-and-reel packaging (3500 pcs/reel vs. 14000 pcs/reel) and package code "H" instead of "I" | No functional difference; same SlimSMA footprint, thermal, and electrical performance | Select SMA6F33A-M3/H for smaller batch prototyping or when 7" reel logistics are preferred |
| SMAJ33A-M3/5B | Same VWM (33 V) and VBR range, but in larger SMA (DO-214AC) package; higher RθJA (150 °C/W vs. 120–150 °C/W), lower mounting density | Less suitable for space-constrained designs; requires larger PCB pad layout and higher thermal margin | Choose SMAJ33A-M3/5B only if legacy SMA footprint compatibility is required or higher surge margin (400 W vs. 600 W) is not needed |
Compared with SMA6F33A-M3/I, SMA6F33A-M3/H offers identical protection performance in identical SlimSMA packaging with different reel size, while SMAJ33A-M3/5B trades compactness and thermal efficiency for broader industry footprint familiarity-making SMA6F33A-M3/I optimal for new high-density designs requiring best-in-class surge density.
Availability
SMA6F33A-M3/I is available at Aetrix Electronics and suitable for industrial motor control, telecom power supply input, automotive body control modules, and IoT sensor node interface applications requiring stable component supply, consistent MSL Level 1 handling, and verified IEC 61000-4-2 Level 4 ESD performance.
Supply support for SMA6F33A-M3/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, TVS, MOSFETs, and optoelectronics with emphasis on reliability, precision, and high-volume manufacturability.
The SMA6F series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-efficiency, low-profile transient suppression in space- and thermal-constrained DC power and signal line applications across industrial, telecom, and automotive markets.
FAQ
What is the maximum clamping voltage of the SMA6F33A-M3/I under a 10/1000 μs surge?
The SMA6F33A-M3/I has a maximum clamping voltage (VC) of 53.1 V at 11.3 A under a 10/1000 μs waveform. This value is measured per standard test conditions and reflects the peak voltage imposed on the protected circuit during such a surge. The SMA6F33A-M3/I maintains this clamping performance across its specified operating temperature range, enabling predictable overvoltage protection design.
Is the SMA6F33A-M3/I suitable for bidirectional transient protection?
No, the SMA6F33A-M3/I is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical characteristics-including breakdown voltage, clamping behavior, and polarity marking-are defined only for reverse-biased (cathode-positive) surge events. For AC or bipolar signal line protection, a dedicated bidirectional variant such as SMA6F33CA-M3/I must be selected instead of the SMA6F33A-M3/I.
What does the "/I" suffix indicate in SMA6F33A-M3/I?
Within the SMA6F33A-M3/I ordering code, the "/I" suffix specifies the tape-and-reel packaging format: 14,000 units per 13-inch diameter reel. It also denotes the package code assigned to devices in the SMA6F22A–SMA6F130A family per Vishay's ordering documentation. The "/I" does not affect electrical or thermal specifications-the SMA6F33A-M3/I performs identically to SMA6F33A-M3/H except for reel size and logistics coding.
Does the SMA6F33A-M3/I meet automotive qualification standards?
The SMA6F33A-M3/I is not AEC-Q200 qualified as a standalone component. While it meets J-STD-020 MSL Level 1 and exhibits robust thermal and ESD performance, Vishay does not list it in its AEC-Q200-certified portfolio. For automotive body control or infotainment applications requiring formal qualification, designers should verify suitability through system-level testing or select an explicitly AEC-Q200–rated alternative-never assume automotive compliance based on the SMA6F33A-M3/I datasheet alone.
How does the voltage temperature coefficient affect SMA6F33A-M3/I clamping performance?
The SMA6F33A-M3/I has a voltage temperature coefficient αT of +10.0 × 10⁻⁴ /°C, meaning its breakdown voltage increases by ~0.1% per °C rise in junction temperature. At 125 °C, VBR rises ~10% above its 25 °C value-shifting from 36.7–40.6 V to approximately 40.4–44.7 V. This directly raises clamping voltage under high-temperature surge conditions, so thermal design must ensure TJ stays within limits to maintain specified VC performance. The SMA6F33A-M3/I datasheet provides the exact formula for calculating VBR at any TJ.
SMA6F33A-M3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-221AC, SMA Flat Leads
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.1V
- Current - Peak Pulse (10/1000µs):
- 11.3A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-221AC (SlimSMA)
SMA6F33A-M3/I FAQ
1.How can I place an order for SMA6F33A-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F33A-M3/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 SMA6F33A-M3/I reliable?
The price and inventory of SMA6F33A-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6F33A-M3/I is usually 5 days.
3.What payment methods are accepted for SMA6F33A-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F33A-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F33A-M3/I?
SMA6F33A-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F33A-M3/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 SMA6F33A-M3/I?
For technical support, including SMA6F33A-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F33A-M3/I requirements.
6.How does Aetrix verify that SMA6F33A-M3/I is sourced from the original manufacturer or authorized distributors?
All SMA6F33A-M3/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 SMA6F33A-M3/I meets industry standards.
7.What is the process for return or replacement of SMA6F33A-M3/I?
All SMA6F33A-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F33A-M3/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 SMA6F33A-M3/I part is unused and in its original packaging.
Return procedure for SMA6F33A-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6F33A-M3/I Tags
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