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Vishay General Semiconductor - Diodes Division SMC5K33A-M3/I
- Part No.:
- SMC5K33A-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC5K33A-M3/I.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:14,285
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Product details
Overview
SMC5K33A-M3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection on power and signal lines. It features a 33 V stand-off voltage (VWM), 36.7–40.6 V breakdown voltage (VBR) at 1 mA, 53.3 V clamping voltage (VC) at 93.8 A (10/1000 μs), 5000 W peak pulse power, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMC5K33A-M3/I datasheet, SMC5K33A-M3/I pinout, SMC5K33A-M3/I application, or SMC5K33A-M3/I equivalent, this device is selected for robust overvoltage protection in DC power rails, automotive sensor interfaces, industrial I/O modules, and telecom line cards where fast response (<1 ns), low clamping ratio, and MSL Level 1 reflow compatibility are critical.
Technical Context
This TVS operates as a unidirectional clamping device with avalanche breakdown behavior, triggered when reverse voltage exceeds VBR. Its low incremental surge resistance (typ. <0.1 Ω) ensures minimal voltage overshoot during high-current transients like ISO 7637-2 pulse 5a or IEC 61000-4-5 surges.
Thermal design is supported by RthJA = 90 °C/W (FR4, 2 oz copper) and RthJM = 4.0 °C/W, enabling sustained operation up to TJ = 150 °C. ESD immunity meets IEC 61000-4-2 at ±30 kV (contact/air), and it complies with UL 497B (E136766) and RoHS/halogen-free (M3 suffix) requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - Tight breakdown tolerance ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 53.3 V at 93.8 A (10/1000 μs) - Clamping voltage limits downstream IC stress during 5000 W surge events. |
| PPPM | 5000 W - Peak pulse power rating for 10/1000 μs waveform; supports automotive load-dump and inductive switching protection. |
| TJ max. | +150 °C - Enables use in under-hood automotive environments and high-ambient industrial enclosures. |
| ESD Rating | ±30 kV HBM - Protects sensitive inputs against human-body-model electrostatic discharge without external circuitry. |
| Package | SMC (DO-214AB) - Surface-mount outline with 3.2 mm × 5.59 mm footprint; compatible with standard SMT reflow (260 °C peak). |
Pinout & Package
SMC5K33A-M3/I uses the industry-standard SMC (DO-214AB) package: cathode-indicating band at one end, anode at the other. Leads are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, and qualified to JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference/ground return | Typically tied to system ground or low-impedance return path; completes clamping loop for unidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| 5000 W peak pulse power (10/1000 μs) | Enables single-device protection against severe automotive load dump (ISO 7637-2) and industrial switching transients. |
| Clamping voltage ≤53.3 V at 93.8 A | Provides >20% margin below typical 60 V automotive system maximum, safeguarding 3.3 V/5 V/12 V logic and power ICs. |
| AEC-Q101 qualified (industrial grade variant) | Validated for extended temperature cycling, mechanical shock, and humidity exposure-suitable for non-safety-critical automotive ECUs. |
| UL 497B recognized (E136766) | Meets safety standards for telecom and industrial equipment requiring certified surge protection components. |
| Halogen-free & RoHS-compliant (M3 suffix) | Supports environmental compliance in global electronics manufacturing without compromising surge performance. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery-fed control module exposed to load dump pulses up to 120 V and ISO 7637-2 transient spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges before they reach LDOs, MCUs, and CAN transceivers. Use Value: Limits peak voltage to ≤53.3 V during 93.8 A transients, preventing latch-up or gate oxide damage in downstream silicon. |
Use Scenario: Analog output line of a pressure sensor in factory automation PLC I/O module subject to cable-induced lightning surges. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt induced common-mode energy before reaching op-amp signal conditioning stage. Use Value: Sub-1 ns response time and 53.3 V clamping protect 24 V analog outputs from exceeding absolute maximum ratings of precision ADC drivers. |
| Telecom Line Card Surge Suppression | Consumer Power Adapter Input Protection |
|
Use Scenario: DC input port of a PoE-powered network switch subjected to IEC 61000-4-5 combination wave surges (10/700 μs, 2 kV). IC Role / Device Role / Timing Role: Primary-level TVS on 48 V DC input rail, coordinated with upstream fuse and secondary-stage MOVs. Use Value: 5000 W rating handles full surge energy without degradation; UL 497B recognition satisfies telecom safety certification requirements. |
Use Scenario: Secondary-side 5 V/9 V output of USB-C PD adapter vulnerable to ESD and capacitive coupling from mains transients. IC Role / Device Role / Timing Role: Final-stage TVS on regulated output to suppress contact ESD (IEC 61000-4-2) and fast-rising noise from switching regulators. Use Value: ±30 kV HBM rating eliminates need for additional ESD diodes; SMC package allows placement near USB connector with minimal trace inductance. |
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-E3/5A (Vishay) | Lower PPPM (400 W), SMA package (smaller footprint, lower thermal mass), same VWM/VBR range. | Suitable for low-energy consumer electronics; insufficient for automotive load dump or industrial surges. | Select SMC5K33A-M3/I when ≥5000 W surge handling and automotive-grade reliability are required. |
| 1.5KE33A (ON Semiconductor) | Higher VBR tolerance (35.1–38.7 V), axial DO-201 package, no AEC-Q101 or UL recognition. | Used in legacy industrial designs; not suitable for automated SMT assembly or safety-certified systems. | Choose SMC5K33A-M3/I for surface-mount compatibility, reflow process support, and regulatory certifications. |
Compared with SMAJ33A-E3/5A and 1.5KE33A, the SMC5K33A-M3/I delivers 12.5× higher peak pulse power in an SMT-optimized package with AEC-Q101 and UL 497B validation-making it the preferred choice for next-generation automotive, industrial, and telecom surge protection where reliability, power handling, and compliance are co-prioritized.
Availability
SMC5K33A-M3/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, telecom line card surge suppression, and consumer power adapter input protection requiring stable component supply across production lifecycles.
Supply support for SMC5K33A-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, MOSFETs, and protection devices with emphasis on high-reliability, high-power, and automotive-qualified solutions.
The SMC5K series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of the SMC5K33A-M3/I at its rated peak pulse current?
The SMC5K33A-M3/I has a maximum clamping voltage (VC) of 53.3 V at 93.8 A peak pulse current with a 10/1000 μs waveform. This value is measured under standardized test conditions and reflects the actual voltage seen by downstream circuitry during a full-rated surge event. The clamping voltage remains stable across temperature due to the device's low dynamic impedance and is critical for ensuring protected ICs stay within their absolute maximum ratings.
Is the SMC5K33A-M3/I qualified for automotive applications?
The SMC5K33A-M3/I is an industrial-grade variant of the SMC5K family and is not AEC-Q101 qualified-only SMC5K10A through SMC5K20A with HM3 suffix carry AEC-Q101 qualification. However, the SMC5K33A-M3/I shares the same SMC package, thermal performance, and electrical characteristics as qualified variants, making it widely used in non-safety-critical automotive subsystems such as body control modules and infotainment power supplies where customer qualification is performed.
What does the "M3" suffix mean in SMC5K33A-M3/I?
The "M3" suffix in SMC5K33A-M3/I indicates halogen-free, RoHS-compliant construction with matte tin-plated leads that meet JESD 201 Class 2 whisker resistance requirements. It also denotes compliance with JEDEC J-STD-020 moisture sensitivity level (MSL) 1, allowing unlimited floor life and peak reflow temperatures up to 260 °C-essential for lead-free SMT assembly processes.
How does the SMC5K33A-M3/I compare to bidirectional TVS diodes?
The SMC5K33A-M3/I is unidirectional and optimized for DC power line protection where polarity is fixed, offering lower leakage current (<1 μA at VWM) and tighter VBR tolerance than comparable bidirectional parts. Bidirectional TVS diodes (e.g., SMC5K33CA) are used for AC or data-line protection but exhibit higher capacitance and leakage. For 33 V DC rails, the SMC5K33A-M3/I provides superior clamping efficiency and lower standby power loss.
Can the SMC5K33A-M3/I be used in parallel for higher surge current handling?
Parallel connection of SMC5K33A-M3/I devices is not recommended due to parameter mismatch (VBR tolerance ±5%) causing current imbalance and premature failure of one unit. For higher current capability, select a higher-rated part (e.g., SMC5K36A or SMC5K40A) or implement staged protection with upstream fusing and coordinated TVS/MOV networks. Vishay does not characterize or guarantee parallel operation for this device.
SMC5K33A-M3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- 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:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 93.8A
- Power - Peak Pulse:
- 5000W (5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMC5K33A-M3/I FAQ
1.How can I place an order for SMC5K33A-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC5K33A-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 SMC5K33A-M3/I reliable?
The price and inventory of SMC5K33A-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 SMC5K33A-M3/I is usually 5 days.
3.What payment methods are accepted for SMC5K33A-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC5K33A-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC5K33A-M3/I?
SMC5K33A-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC5K33A-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 SMC5K33A-M3/I?
For technical support, including SMC5K33A-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC5K33A-M3/I requirements.
6.How does Aetrix verify that SMC5K33A-M3/I is sourced from the original manufacturer or authorized distributors?
All SMC5K33A-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 SMC5K33A-M3/I meets industry standards.
7.What is the process for return or replacement of SMC5K33A-M3/I?
All SMC5K33A-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMC5K33A-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 SMC5K33A-M3/I part is unused and in its original packaging.
Return procedure for SMC5K33A-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC5K33A-M3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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