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Vishay General Semiconductor - Diodes Division SMC3K45CA-M3/9A
- Part No.:
- SMC3K45CA-M3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K45CA-M3/9A.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,871
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Product details
Overview
SMC3K45CA-M3/9A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), with breakdown voltage 50.0–55.3 V, stand-off voltage 45 V, and clamping voltage 72.7 V at 41.3 A peak surge current. It protects MOSFETs and sensor signal lines in automotive powertrain control units.
For engineers reviewing the SMC3K45CA-M3/9A datasheet, SMC3K45CA-M3/9A pinout, SMC3K45CA-M3/9A application, or SMC3K45CA-M3/9A equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150 °C junction temperature rating, and compatibility with wave-soldering process constraints.
Technical Context
This TVS device operates as a voltage-clamped shunt protector, responding within picoseconds to transient overvoltages induced by inductive load switching or ESD events. Its low incremental surge resistance and fast response time ensure effective suppression of transients up to 3000 W without thermal runaway under defined pulse conditions.
The SMC3K45CA-M3/9A uses silicon avalanche junction technology with halogen-free, RoHS-compliant construction and matte tin-plated leads solderable per J-STD-002. It meets MSL level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 50.0 V / 55.3 V - defines minimum and maximum voltage at which avalanche conduction begins at 1 mA test current |
| VWM | 45 V - maximum continuous reverse working voltage before leakage exceeds 2 μA |
| VC @ IPPM | 72.7 V - clamped voltage during 41.3 A 10/1000 μs surge, limiting stress on downstream ICs |
| PPPM | 3000 W - peak pulse power handling capacity under standardized 10/1000 μs waveform |
| TJ max | 150 °C - maximum allowable junction temperature for reliable long-term operation |
| Polarity | Bidirectional - symmetric clamping for AC-coupled or floating signal lines without polarity sensitivity |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 8.0 mm × 8.0 mm copper pad area recommendation |
Pinout & Package
SMC3K45CA-M3/9A is housed in an SMC (DO-214AB) package with two terminals: cathode and anode. No polarity marking is present on bidirectional variants; orientation is determined by PCB layout symmetry. Leads are matte tin plated and compliant with JESD 22-B102 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Completes low-impedance shunt path to ground during overvoltage event; connected to protected line |
| Cathode | Transient current sink | Connected to system ground or reference plane; carries full surge current during clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| MSL Level 1 rating | Enables standard reflow assembly without moisture sensitivity concerns or baking preconditioning |
| UL 497B recognition | Confirms safety compliance for use in telecom and industrial equipment requiring certified surge protection |
| Halogen-free & RoHS | Meets environmental compliance mandates for global OEM production and end-of-life recycling |
Applications
| Automotive Powertrain Control | Industrial Sensor Signal Protection |
|---|---|
Use Scenario: Protecting CAN transceiver inputs and microcontroller GPIOs from load-dump and alternator ripple transients in engine control modules. IC Role / Device Role: Shunt-type transient suppressor placed across protected signal line and chassis ground. Use Value: Clamps 72.7 V at 41.3 A, preventing damage to 5 V or 3.3 V logic interfaces while maintaining AEC-Q101 reliability. | Use Scenario: Safeguarding analog output lines of pressure and temperature sensors in PLC I/O modules exposed to relay coil kickback. IC Role / Device Role: Bidirectional voltage clamp on 0–10 V or 4–20 mA signal paths. Use Value: 45 V stand-off ensures no interference during normal operation; 3000 W pulse rating handles repetitive inductive spikes. |
| Telecom Line Interface | Consumer Appliance Motor Drive |
Use Scenario: Surge protection on Ethernet PHY differential pairs and telephone line interface circuits subject to lightning-induced surges. IC Role / Device Role: Primary-level TVS on unshielded twisted-pair input stages. Use Value: UL 497B recognition supports safety certification; bidirectional symmetry matches AC-coupled data lines. | Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machine control boards. IC Role / Device Role: Across-motor terminals and H-bridge power FET drains. Use Value: 150 °C junction rating sustains operation near heat-generating motor drivers; SMC package enables high-density layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K45CAHM3/9A | AEC-Q101 qualified version with identical electrical specs; HM3 suffix denotes automotive qualification | Required for new automotive designs where AEC-Q101 compliance is mandatory | Select SMC3K45CAHM3/9A when automotive qualification is required; SMC3K45CA-M3/9A is commercial grade only |
| SMC3K43CA-M3/9A | Lower VBR (47.8–52.8 V) and VWM (43 V); clamping voltage 69.4 V at 43.2 A | Suitable where lower clamping threshold is needed to protect 3.3 V or 5 V rails with tighter margins | Choose SMC3K43CA-M3/9A if system requires earlier clamping onset below 45 V working voltage |
Compared with SMC3K45CA-M3/9A, SMC3K45CAHM3/9A adds AEC-Q101 qualification without electrical change, while SMC3K43CA-M3/9A offers lower voltage thresholds at the cost of reduced stand-off margin-both serve distinct design constraints rather than acting as drop-in replacements.
Availability
SMC3K45CA-M3/9A is available at Aetrix Electronics and suitable for automotive powertrain control, industrial sensor interface, and telecom line protection requiring stable component supply and traceable sourcing.
Supply support for SMC3K45CA-M3/9A 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 supplier of discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability and application-specific performance.
The SMC3KxxCA series was designed for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where robustness against load dump, ESD, and inductive switching is critical.
FAQ
What is the maximum clamping voltage of the SMC3K45CA-M3/9A under standard test conditions?
The SMC3K45CA-M3/9A has a maximum clamping voltage (VC) of 72.7 V when subjected to its rated peak pulse current of 41.3 A using the 10/1000 μs waveform. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during transient events. The SMC3K45CA-M3/9A maintains this clamping performance across its specified operating temperature range.
Is the SMC3K45CA-M3/9A suitable for automotive applications?
The SMC3K45CA-M3/9A is not AEC-Q101 qualified and is designated "Not for New Designs" per Vishay documentation. While it shares the same electrical characteristics as the qualified SMC3K45CAHM3/9A variant, the SMC3K45CA-M3/9A is commercial-grade only. For new automotive designs, engineers must specify SMC3K45CAHM3/9A instead of SMC3K45CA-M3/9A.
What does the "-M3/9A" suffix indicate in SMC3K45CA-M3/9A?
The "-M3" suffix indicates halogen-free, RoHS-compliant, commercial-grade construction with JESD 201 class 2 whisker resistance. The "/9A" denotes packaging in 13-inch diameter plastic tape and reel containing 3500 units. This differs from "/57", which specifies 7-inch reels with 850 units. The SMC3K45CA-M3/9A is not qualified to AEC-Q101.
Can the SMC3K45CA-M3/9A be used in bidirectional signal lines?
Yes, the SMC3K45CA-M3/9A is exclusively available in bidirectional polarity, making it suitable for AC-coupled or floating signal paths such as RS-485, CAN, or audio lines. Its symmetrical breakdown behavior ensures equal clamping in both directions, and no polarity marking is applied to the SMC package. This bidirectional capability is intrinsic to the SMC3K45CA-M3/9A device structure.
What is the recommended PCB pad layout for the SMC3K45CA-M3/9A?
Vishay specifies a 0.305" × 0.320" (7.75 mm × 8.13 mm) copper pad area for optimal thermal dissipation and surge current handling. The SMC3K45CA-M3/9A datasheet recommends using this pad size to maintain 3000 W pulse rating and avoid derating. Smaller pads reduce thermal mass and may compromise peak power capability, especially in high-repetition-rate transient environments.
SMC3K45CA-M3/9A 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 41.3A
- Power - Peak Pulse:
- 3000W (3kW)
- 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 (SMCJ)
SMC3K45CA-M3/9A FAQ
1.How can I place an order for SMC3K45CA-M3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K45CA-M3/9A 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 SMC3K45CA-M3/9A reliable?
The price and inventory of SMC3K45CA-M3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K45CA-M3/9A is usually 5 days.
3.What payment methods are accepted for SMC3K45CA-M3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K45CA-M3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K45CA-M3/9A?
SMC3K45CA-M3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K45CA-M3/9A 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 SMC3K45CA-M3/9A?
For technical support, including SMC3K45CA-M3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K45CA-M3/9A requirements.
6.How does Aetrix verify that SMC3K45CA-M3/9A is sourced from the original manufacturer or authorized distributors?
All SMC3K45CA-M3/9A 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 SMC3K45CA-M3/9A meets industry standards.
7.What is the process for return or replacement of SMC3K45CA-M3/9A?
All SMC3K45CA-M3/9A units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K45CA-M3/9A, 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 SMC3K45CA-M3/9A part is unused and in its original packaging.
Return procedure for SMC3K45CA-M3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K45CA-M3/9A Tags
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