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Vishay General Semiconductor - Diodes Division SMC3K70CA-M3/9A
- Part No.:
- SMC3K70CA-M3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K70CA-M3/9A.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,335
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Product details
Overview
SMC3K70CA-M3/9A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in the SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), 70 V standoff voltage (VWM), 77.8–86.0 V breakdown voltage (VBR), and 113 V maximum clamping voltage (VC) at 26.5 A peak pulse current. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and lightning surges in automotive and industrial systems.
For engineers reviewing the SMC3K70CA-M3/9A datasheet, SMC3K70CA-M3/9A pinout, SMC3K70CA-M3/9A application, or SMC3K70CA-M3/9A equivalent, key selection criteria include clamping voltage margin relative to protected device VDS/VDD, bidirectional polarity requirement, 3000 W surge capability, AEC-Q101 qualification status, and SMC package thermal and layout compatibility.
Technical Context
This TVS diode operates as a voltage-clamping protection device that remains high-impedance below VWM (70 V) and rapidly transitions to low-impedance conduction above VBR (min 77.8 V) to shunt transient energy. Its bidirectional structure enables symmetric clamping on both polarities without external polarity management.
Designed for transient suppression per IEC 61000-4-5 (surge) and ISO 7637-2 (automotive), it delivers 113 V clamping at 26.5 A with low incremental surge resistance and sub-nanosecond response time. The device is qualified to AEC-Q101 and meets UL 497B (E136766) and J-STD-020 MSL Level 1 standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 70 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for normal circuit operation. |
| VBR (min/max) | 77.8 V / 86.0 V - Breakdown occurs within this range at 1 mA test current; defines onset of protective conduction. |
| VC @ IPPM | 113 V - Clamping voltage measured at 26.5 A peak pulse current; determines maximum stress imposed on protected circuitry. |
| PPPM | 3000 W - Peak pulse power handling with 10/1000 μs waveform; quantifies transient energy absorption capacity. |
| Polarity | Bidirectional - Provides symmetrical overvoltage protection on both positive and negative transients without polarity constraints. |
| TJ max. | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive and high-ambient industrial environments. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 8.0 mm × 8.0 mm copper pad area recommendation for thermal dissipation. |
Pinout & Package
SMC3K70CA-M3/9A uses the SMC (DO-214AB) package: a two-terminal, surface-mount plastic case with cathode band marking omitted on bidirectional variants. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and qualified to JESD 201 Class 2 whisker test.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (non-polarized) | Transient current path | Both terminals function identically in bidirectional mode; no polarity assignment required during PCB layout. |
| Case (body) | Thermal and mechanical interface | Plastic body provides electrical isolation; thermal performance depends on copper pad area (0.31" × 0.31") per Vishay recommended layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
| UL 497B recognition (E136766) | Confirms compliance with safety requirements for telecom and industrial signal line protection applications. |
| MSL Level 1 (J-STD-020) | Enables standard reflow assembly without moisture sensitivity concerns or baking preconditioning. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance mandates for commercial-grade electronics without compromising surge performance. |
Applications
| Automotive Powertrain Sensors | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting crankshaft/camshaft position sensor signal lines from load dump and alternator ripple-induced transients in engine control units. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across differential sensor output pins to limit voltage excursions to ≤113 V during 3000 W surges. Use Value: Prevents sensor IC latch-up or damage while maintaining signal integrity under ISO 7637-2 Pulse 5a/b conditions. |
Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers against field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Standoff-rated (70 V) TVS placed between input terminal and ground to clamp transients before reaching optocoupler input stage. Use Value: Enables robust immunity to IEC 61000-4-4 EFT and IEC 61000-4-5 surge events without degrading input threshold accuracy. |
| Telecom Line Interface Cards | Consumer Appliance Motor Control |
Use Scenario: Shielding RS-485 transceiver bus lines in base station backhaul cards from lightning-induced common-mode surges on outdoor cabling. IC Role / Device Role / Timing Role: Bidirectional TVS connected line-to-line and line-to-ground to suppress ±113 V clamped transients across differential pair. Use Value: Maintains signal eye diagram integrity after 3000 W 10/1000 μs surges per IEC 61000-4-5 Level 4. |
Use Scenario: Suppressing MOSFET gate-source voltage spikes caused by brush motor commutation noise in washing machine main control boards. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly across gate and source terminals of power MOSFETs driving motor windings. Use Value: Limits gate oxide stress to safe levels (<113 V) during repetitive 26.5 A surge events, extending FET lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K70CAHM3/9A | AEC-Q101 qualified version with identical VWM, VBR, VC, and PPPM ratings; same SMC package and M3 termination. | Required for automotive production programs mandating AEC-Q101 compliance; otherwise electrically interchangeable. | Select SMC3K70CAHM3/9A when automotive qualification is mandatory; SMC3K70CA-M3/9A suffices for commercial-grade designs. |
| SMC3K64CA-M3/9A | Lower VWM (64 V) and VBR (71.1–78.6 V); clamps at 103 V @ 29.1 A; retains 3000 W PPPM and SMC package. | Better suited for 48–60 V nominal systems where tighter clamping margin is needed relative to rail voltage. | Choose SMC3K64CA-M3/9A when protecting circuits with lower operating voltage headroom than 70 V systems. |
Compared with SMC3K70CA-M3/9A, SMC3K70CAHM3/9A adds AEC-Q101 validation without altering electrical behavior, while SMC3K64CA-M3/9A trades higher voltage headroom for improved clamping margin in sub-70 V rails-enabling precise system-level surge coordination.
Availability
SMC3K70CA-M3/9A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line cards, and consumer appliance motor drives requiring stable component supply and commercial-grade TVS protection.
Supply support for SMC3K70CA-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, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMC3KxxCA series was developed to deliver high-power transient suppression in compact SMC packages for automotive, industrial, and telecom applications where bidirectional clamping and AEC-Q101 readiness are critical.
FAQ
What does the "-M3/9A" suffix mean in SMC3K70CA-M3/9A?
The "-M3" suffix indicates halogen-free, RoHS-compliant construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance, while "/9A" specifies packaging in 13-inch diameter plastic tape and reel containing 3500 units. This configuration ensures compatibility with high-volume automated assembly and meets commercial environmental compliance requirements.
Is SMC3K70CA-M3/9A suitable for automotive applications?
SMC3K70CA-M3/9A is not AEC-Q101 qualified; it is commercial grade. For automotive use, Vishay recommends SMC3K70CAHM3/9A-the AEC-Q101 qualified variant with identical electrical specs and SMC packaging. SMC3K70CA-M3/9A may be used in non-safety-critical aftermarket or infotainment subsystems only after full system-level validation.
What is the maximum clamping voltage of SMC3K70CA-M3/9A and how is it measured?
The maximum clamping voltage of SMC3K70CA-M3/9A is 113 V, measured at 26.5 A peak pulse current using a 10/1000 μs waveform per ANSI/IEEE C62.35. This value represents the highest voltage seen across the device during standardized surge testing and defines the upper voltage stress imposed on downstream components.
Does SMC3K70CA-M3/9A have polarity markings on the package?
No. As a bidirectional TVS, SMC3K70CA-M3/9A has no anode or cathode designation and carries no polarity marking on the SMC (DO-214AB) case. Both terminals are functionally identical, allowing placement in either orientation on the PCB without affecting protection performance.
How does SMC3K70CA-M3/9A compare to SMC3K70CAHM3/9A in terms of thermal performance?
SMC3K70CA-M3/9A and SMC3K70CAHM3/9A share identical thermal characteristics: same SMC package, junction-to-ambient thermal resistance, 150 °C maximum junction temperature, and recommended 8.0 mm × 8.0 mm copper pad layout. The HM3 suffix denotes AEC-Q101 qualification-not a thermal enhancement-so thermal design rules apply equally to both.
SMC3K70CA-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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 26.5A
- 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)
SMC3K70CA-M3/9A FAQ
1.How can I place an order for SMC3K70CA-M3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K70CA-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 SMC3K70CA-M3/9A reliable?
The price and inventory of SMC3K70CA-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 SMC3K70CA-M3/9A is usually 5 days.
3.What payment methods are accepted for SMC3K70CA-M3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K70CA-M3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K70CA-M3/9A?
SMC3K70CA-M3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K70CA-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 SMC3K70CA-M3/9A?
For technical support, including SMC3K70CA-M3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K70CA-M3/9A requirements.
6.How does Aetrix verify that SMC3K70CA-M3/9A is sourced from the original manufacturer or authorized distributors?
All SMC3K70CA-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 SMC3K70CA-M3/9A meets industry standards.
7.What is the process for return or replacement of SMC3K70CA-M3/9A?
All SMC3K70CA-M3/9A units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K70CA-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 SMC3K70CA-M3/9A part is unused and in its original packaging.
Return procedure for SMC3K70CA-M3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K70CA-M3/9A Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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