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Vishay General Semiconductor - Diodes Division SMC3K51CA-M3/9A
- Part No.:
- SMC3K51CA-M3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K51CA-M3/9A.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,591
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Product details
Overview
SMC3K51CA-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), 51 V stand-off voltage, 82.4 V maximum clamping voltage at 36.4 A peak surge current, and AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the SMC3K51CA-M3/9A datasheet, SMC3K51CA-M3/9A pinout, SMC3K51CA-M3/9A application, or SMC3K51CA-M3/9A equivalent, key selection criteria include clamping performance under 10/1000 μs transients, bidirectional polarity requirement, thermal derating above 25 °C, and compatibility with automated SMT assembly per J-STD-002 and JESD 22-B102.
Technical Context
This TVS device operates as a voltage-clamping protector for sensitive semiconductor nodes, responding within picoseconds to transient overvoltages induced by inductive switching or ESD events. Its bidirectional structure enables symmetrical clamping on both polarities without external polarity management.
The SMC3K51CA-M3/9A features low incremental surge resistance and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak, supporting high-reliability industrial and automotive PCB assembly. It is not recommended for bottom-side wave soldering due to thermal stress limitations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin below system rail. |
| VBR (min/max) | 56.7 V / 62.7 V - Breakdown voltage range at 1 mA test current; ensures consistent turn-on threshold across production lots. |
| VC @ IPPM | 82.4 V - Clamping voltage at 36.4 A peak pulse; determines worst-case voltage seen by protected IC during surge. |
| PPPM | 3000 W - Peak pulse power handling (10/1000 μs waveform); quantifies transient energy absorption capability. |
| TJ max | +150 °C - Maximum junction temperature; sets thermal design limits for sustained operation and surge recovery. |
| Polarity | Bidirectional - Provides symmetrical overvoltage protection on AC lines or unidirectional rails without polarity awareness. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 8.0 mm × 8.0 mm copper pad area recommendation for thermal dissipation. |
Pinout & Package
SMC3K51CA-M3/9A uses the standard SMC (DO-214AB) package: a 2-terminal surface-mount device with no polarity marking for bidirectional types. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker test requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (unmarked) | Transient conduction path | Both terminals function identically in bidirectional mode; clamps voltage exceeding ±VBR regardless of polarity. |
| Cathode/Anode (unmarked) | Transient conduction path | No functional distinction between pins; layout requires symmetric trace routing and equal thermal mass for reliability. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
| MSL Level 1 rating | Supports single-reflow assembly up to 260 °C peak without moisture-induced damage or popcorn effect. |
| UL 497B recognition | Meets safety standards for transient protectors used in telecom and industrial signal line applications (File E136766). |
| Halogen-free & RoHS-compliant | Complies with environmental regulations for commercial-grade SMC3K51CA-M3/9A variant (M3 suffix). |
Applications
| Automotive Power Line Protection | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting CAN transceiver power rails against load dump and jump-start transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed between VCC and GND upstream of LDO regulators. Use Value: Limits transient voltage to ≤82.4 V during 3000 W surges, preventing latch-up or permanent damage to downstream ICs. | Use Scenario: Shielding analog front-end inputs of pressure/temperature sensors from ESD and relay-switching spikes in factory automation PLCs. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential sensor lines (e.g., RS-485, 4–20 mA loops). Use Value: Maintains signal integrity by clamping fast transients while adding <10 pF junction capacitance at zero bias. |
| Telecom Interface Surge Protection | Consumer Power Adapter Input Stage |
Use Scenario: Safeguarding Ethernet PHY interface power and data lines against lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary-level TVS on 3.3 V/5 V bias rails feeding magnetics or isolation transformers. Use Value: Absorbs 10/1000 μs surges up to 36.4 A without degradation, meeting UL 497B safety certification requirements. | Use Scenario: Overvoltage suppression on secondary-side DC outputs of wall adapters exposed to mains coupling events. IC Role / Device Role / Timing Role: Secondary-side clamping device after rectification and filtering, before USB-PD or linear regulator stages. Use Value: Enables compact SMC footprint while delivering 3000 W surge immunity-critical for space-constrained consumer enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K51CAHM3/9A | AEC-Q101 qualified version with identical electrical specs; HM3 suffix denotes automotive qualification and same halogen-free/RoHS compliance. | Required for automotive OEM designs needing formal AEC-Q101 documentation and traceability. | Select SMC3K51CAHM3/9A when automotive qualification is mandatory; otherwise SMC3K51CA-M3/9A suffices for commercial use. |
| SMC3K48CA-M3/9A | Lower VWM (48 V) and VC (77.4 V); same 3000 W rating but 38.8 A IPPM. | Better suited for 48 V nominal systems where tighter clamping margin is needed below 80 V. | Choose SMC3K48CA-M3/9A only if system operating voltage is ≤48 V and lower clamping voltage is critical. |
Compared with SMC3K51CA-M3/9A, SMC3K51CAHM3/9A adds formal automotive qualification without electrical trade-offs, while SMC3K48CA-M3/9A offers lower clamping at reduced stand-off voltage-neither is pin-compatible drop-in replacements but serve adjacent voltage-class applications.
Availability
SMC3K51CA-M3/9A is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor signal conditioning, telecom interface surge protection, and consumer power adapter input stage applications requiring stable component supply and long-term obsolescence management.
Supply support for SMC3K51CA-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 leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMC3KxxCA series was designed specifically for high-energy transient suppression in harsh environments-including automotive, industrial, and telecom infrastructure-where robust 3000 W surge handling and AEC-Q101 compliance are essential.
FAQ
What is the maximum clamping voltage of SMC3K51CA-M3/9A at its rated peak pulse current?
The SMC3K51CA-M3/9A has a maximum clamping voltage (VC) of 82.4 V at its rated peak pulse current (IPPM) of 36.4 A, measured using the standardized 10/1000 μs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and is guaranteed across the full operating temperature range.
Is SMC3K51CA-M3/9A suitable for automotive applications?
SMC3K51CA-M3/9A is halogen-free, RoHS-compliant, and meets MSL Level 1 and UL 497B safety requirements-but it is not AEC-Q101 qualified. For automotive applications requiring formal qualification, the SMC3K51CAHM3/9A variant must be used instead. The base SMC3K51CA-M3/9A is intended for commercial and industrial use.
What does the "-M3/9A" suffix indicate in SMC3K51CA-M3/9A?
The "-M3" suffix denotes halogen-free, RoHS-compliant, commercial-grade construction with JESD 201 Class 2 whisker resistance. The "/9A" indicates packaging in 13-inch diameter plastic tape and reel, containing 3500 units per reel-optimized for high-volume SMT placement equipment.
Does SMC3K51CA-M3/9A have polarity markings on the package?
No, SMC3K51CA-M3/9A is a bidirectional TVS diode and carries no polarity marking on the SMC (DO-214AB) case. Both terminals are functionally identical, and PCB layout does not require orientation alignment. This simplifies placement and eliminates risk of reverse installation during assembly.
What is the junction temperature limit for continuous operation of SMC3K51CA-M3/9A?
The SMC3K51CA-M3/9A has a maximum junction temperature (TJ) of +150 °C for both continuous operation and transient recovery. Derating curves in the datasheet show that peak pulse power must be reduced above TA = 25 °C ambient, with 50% derating required at +125 °C ambient to maintain safe thermal operation.
SMC3K51CA-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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 36.4A
- 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)
SMC3K51CA-M3/9A FAQ
1.How can I place an order for SMC3K51CA-M3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K51CA-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 SMC3K51CA-M3/9A reliable?
The price and inventory of SMC3K51CA-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 SMC3K51CA-M3/9A is usually 5 days.
3.What payment methods are accepted for SMC3K51CA-M3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K51CA-M3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K51CA-M3/9A?
SMC3K51CA-M3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K51CA-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 SMC3K51CA-M3/9A?
For technical support, including SMC3K51CA-M3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K51CA-M3/9A requirements.
6.How does Aetrix verify that SMC3K51CA-M3/9A is sourced from the original manufacturer or authorized distributors?
All SMC3K51CA-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 SMC3K51CA-M3/9A meets industry standards.
7.What is the process for return or replacement of SMC3K51CA-M3/9A?
All SMC3K51CA-M3/9A units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K51CA-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 SMC3K51CA-M3/9A part is unused and in its original packaging.
Return procedure for SMC3K51CA-M3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K51CA-M3/9A Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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