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Vishay General Semiconductor - Diodes Division SMC3K70CA-M3/57
- Part No.:
- SMC3K70CA-M3/57
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K70CA-M3/57.pdf
- Description:
- TVS DIODE 70VWM 113VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,633
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Product details
Overview
SMC3K70CA-M3/57 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), with a breakdown voltage range of 77.8 V to 86.0 V, stand-off voltage of 70 V, and clamping voltage of 113 V at 26.5 A peak pulse current. It is AEC-Q101 qualified and RoHS-compliant, designed for robust overvoltage protection in automotive powertrain and body electronics.
For engineers reviewing the SMC3K70CA-M3/57 datasheet, SMC3K70CA-M3/57 pinout, SMC3K70CA-M3/57 application, or SMC3K70CA-M3/57 equivalent, key selection criteria include verified bidirectional clamping performance, MSL Level 1 moisture sensitivity, JESD201 Class 2 whisker resistance, and compatibility with wave-soldering restrictions for top-side mounting only.
Technical Context
The SMC3K70CA-M3/57 operates as a silicon avalanche diode with fast response time (<1 ns) and low incremental surge resistance, enabling effective suppression of transient energy from inductive switching and ESD events. Its bidirectional polarity provides symmetrical clamping on both positive and negative excursions without external polarity management.
Designed for operation across -55 °C to +150 °C junction temperature, it features UL 497B safety recognition (E136766) and meets J-STD-020 MSL Level 1, supporting reflow profiles up to 260 °C peak. The device is not recommended for PCB bottom-side wave mounting due to thermal stress limitations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 3000 W - sustains high-energy transients common in automotive load-dump and ISO 7637-2 pulse 5a scenarios |
| Breakdown Voltage (VBR) | 77.8 V to 86.0 V at 1.0 mA - defines minimum voltage at which avalanche conduction begins, ensuring reliable triggering above system operating rail |
| Stand-off Voltage (VWM) | 70 V - maximum continuous reverse working voltage before leakage exceeds 2.0 μA, matching 60 V nominal automotive systems with margin |
| Clamping Voltage (VC) | 113 V at 26.5 A - limits voltage seen by protected ICs during full-rated surge, critical for safeguarding 75 V-rated CAN transceivers or microcontrollers |
| Junction Temperature Range | -55 °C to +150 °C - supports under-hood deployment in engine control units and transmission modules |
| Package | SMC (DO-214AB) - industry-standard 8.0 mm × 8.0 mm copper pad footprint with matte tin-plated leads per J-STD-002 |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability including HTOL, TCT, and ESD testing per AEC specification |
Pinout & Package
SMC3K70CA-M3/57 uses the standard SMC (DO-214AB) surface-mount package: two-terminal, unidirectional marking-free construction for bidirectional operation. Terminals are matte tin-plated, solderable per J-STD-002, with no polarity marking on the case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Case) | Anode connection point in bidirectional configuration | Shared metallization forms symmetrical avalanche junction; no functional distinction between terminals - either lead may serve as anode or cathode depending on transient polarity |
| Anode (Lead) | Cathode connection point in bidirectional configuration | Identical physical structure to cathode terminal; bidirectional behavior arises from internal symmetric doping, not external pin assignment |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional polarity | Eliminates need for orientation-aware placement or external series components in AC-coupled or differential signal lines |
| 3000 W peak pulse rating | Withstands ISO 7637-2 Pulse 5a (load dump) up to 120 V with 10 ms duration without failure |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock per AEC test plan |
| MSL Level 1 rating | Enables single-reflow assembly without dry-pack or baking, reducing manufacturing complexity and cost |
| UL 497B recognition (E136766) | Meets safety requirements for transient protectors in telecom and industrial equipment requiring third-party certification |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protection of 12 V/24 V power rails in junction boxes and battery management systems against load dump and jump-start surges. IC Role / Device Role: Primary clamping element placed directly at power entry point before DC-DC converters or microcontrollers. Use Value: Limits transient voltage to ≤113 V, preventing latch-up or gate oxide damage in downstream 75 V-rated MOSFET drivers and PMICs. |
Use Scenario: Shielding analog and digital sensor outputs (e.g., pressure, temperature, position) from ESD and cable discharge events in factory automation. IC Role / Device Role: Low-capacitance TVS placed adjacent to connector interface to shunt fast transients before signal conditioning circuitry. Use Value: Clamps ±8 kV contact ESD (IEC 61000-4-2) within nanoseconds while adding <10 pF parasitic capacitance to preserve signal integrity. |
| Telecom Line Interface | Consumer Appliance Motor Control |
Use Scenario: Overvoltage protection on Ethernet PHY power pins and auxiliary DC feeds in PoE-powered network switches and routers. IC Role / Device Role: Secondary surge suppressor coordinated with primary GDT or MOV to handle residual fast-rising transients. Use Value: Provides precise 70 V stand-off with 113 V clamping, aligning with IEEE 802.3af/at voltage tolerances and avoiding false triggering during normal operation. |
Use Scenario: Guarding MCU I/O and gate driver inputs in washing machine and HVAC blower motor control boards exposed to relay coil kickback. IC Role / Device Role: Fast-response TVS mounted at PCB edge near relay connectors to absorb inductive spikes before reaching logic-level circuitry. Use Value: Delivers 26.5 A surge current handling at 10/1000 μs, sufficient to suppress >600 V spikes from 120 VAC relay coils without degradation over 100,000 cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K70CAHM3/57 | AEC-Q101 qualified variant with identical electrical specs; differs only in qualification status and whisker test compliance (JESD201 Class 2). | Required for new automotive designs where AEC-Q101 compliance is mandatory; same footprint and soldering profile. | Select SMC3K70CAHM3/57 when qualifying for production in automotive OEM programs or Tier 1 supply chains. |
| SMC3K64CA-M3/57 | Lower stand-off voltage (64 V) and clamping voltage (103 V); 29.1 A IPPM rating at same 3000 W PPPM. | Better suited for 48 V systems or applications requiring tighter clamping margin below 105 V, such as industrial PLC I/O modules. | Choose SMC3K64CA-M3/57 when protecting 54 V nominal circuits where 70 V stand-off risks nuisance conduction during line regulation ripple. |
Compared with SMC3K70CA-M3/57, the HM3 variant adds formal AEC-Q101 validation without electrical change, while SMC3K64CA-M3/57 trades higher voltage headroom for lower clamping-enabling optimized protection in 48 V architectures or noise-sensitive analog domains.
Availability
SMC3K70CA-M3/57 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom line protection, and consumer appliance motor control requiring stable component supply and long-term manufacturability.
Supply support for SMC3K70CA-M3/57 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 reliability, efficiency, and application-specific optimization.
The SMC3KxxCA series was developed to deliver high-power transient suppression in compact SMC packages for automotive and industrial environments where space, thermal performance, and qualification rigor are critical.
FAQ
What is the maximum clamping voltage of the SMC3K70CA-M3/57 under full-rated surge conditions?
The SMC3K70CA-M3/57 has a maximum clamping voltage (VC) of 113 V at 26.5 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage imposed on protected circuitry during worst-case transient events. The SMC3K70CA-M3/57 maintains this clamping performance across its specified junction temperature range of -55 °C to +150 °C.
Is the SMC3K70CA-M3/57 suitable for automotive applications requiring AEC-Q101 qualification?
No - the SMC3K70CA-M3/57 is commercial-grade and not AEC-Q101 qualified. It carries the "M3" suffix indicating halogen-free, RoHS-compliant construction but lacks the extended reliability testing required for automotive use. For AEC-Q101 compliance, the SMC3K70CAHM3/57 variant must be selected. The SMC3K70CA-M3/57 remains appropriate for industrial and consumer applications where qualification is not mandated.
What is the stand-off voltage rating of the SMC3K70CA-M3/57, and how does it relate to system operating voltage?
The SMC3K70CA-M3/57 has a stand-off voltage (VWM) of 70 V, meaning it remains non-conductive with leakage <2.0 μA up to this reverse voltage. This rating provides safe margin above 60 V nominal automotive systems and 48 V industrial buses, preventing false triggering during normal operation while allowing rapid avalanche onset during transients exceeding 77.8 V. The SMC3K70CA-M3/57 thus balances robustness and stability in mixed-voltage environments.
Can the SMC3K70CA-M3/57 be used in bottom-side wave soldering processes?
No - the SMC3K70CA-M3/57 is explicitly not recommended for PCB bottom-side wave mounting per Vishay documentation. Its thermal mass and package construction risk delamination or solder joint voiding under direct wave exposure. The SMC3K70CA-M3/57 is intended for top-side reflow soldering (MSL Level 1, 260 °C peak) or selective wave processes targeting only designated areas, with strict adherence to the manufacturer's mounting pad layout guidelines.
What is the polarity configuration of the SMC3K70CA-M3/57, and how is it identified on the device?
The SMC3K70CA-M3/57 is a bidirectional TVS diode with no polarity marking on the case - both terminals are functionally identical and interchangeable. Its symmetric internal structure enables equal clamping performance for positive and negative transients without requiring orientation during placement. This eliminates polarity verification steps in automated assembly and simplifies design reuse across AC-coupled or differential interfaces. The SMC3K70CA-M3/57 achieves this through matched avalanche junctions rather than external circuitry.
SMC3K70CA-M3/57 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-M3/57 FAQ
1.How can I place an order for SMC3K70CA-M3/57 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K70CA-M3/57 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-M3/57 reliable?
The price and inventory of SMC3K70CA-M3/57 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC3K70CA-M3/57 is usually 5 days.
3.What payment methods are accepted for SMC3K70CA-M3/57?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K70CA-M3/57 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K70CA-M3/57?
SMC3K70CA-M3/57 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K70CA-M3/57 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-M3/57?
For technical support, including SMC3K70CA-M3/57 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K70CA-M3/57 requirements.
6.How does Aetrix verify that SMC3K70CA-M3/57 is sourced from the original manufacturer or authorized distributors?
All SMC3K70CA-M3/57 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-M3/57 meets industry standards.
7.What is the process for return or replacement of SMC3K70CA-M3/57?
All SMC3K70CA-M3/57 units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K70CA-M3/57, 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-M3/57 part is unused and in its original packaging.
Return procedure for SMC3K70CA-M3/57:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K70CA-M3/57 Tags
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