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Vishay General Semiconductor - Diodes Division SMC3K78CA-M3/9A
- Part No.:
- SMC3K78CA-M3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC3K78CA-M3/9A.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,500
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Product details
Overview
SMC3K78CA-M3/9A from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, rated for 3000 W peak pulse power (10/1000 μs), 78 V standoff voltage (VWM), 86.7–95.8 V breakdown voltage (VBR), and 126 V clamping voltage (VC) at 23.8 A peak surge 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 SMC3K78CA-M3/9A datasheet, SMC3K78CA-M3/9A pinout, SMC3K78CA-M3/9A application, or SMC3K78CA-M3/9A equivalent, key selection criteria include bidirectional polarity, AEC-Q101 qualification, MSL Level 1 moisture sensitivity, UL 497B safety recognition, and halogen-free RoHS-compliant construction - all verified per Vishay Document #89433 (Rev. 13-Sep-2022).
Technical Context
This TVS diode operates as a voltage-clamping protection device across sensitive nodes, responding within picoseconds to transient overvoltages exceeding its VBR threshold. Its low incremental surge resistance and fast response time ensure minimal let-through energy during 10/1000 μs surges up to 3000 W.
Designed for unidirectional PCB top-side mounting only, it features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and passes JESD 201 Class 2 whisker testing. Junction temperature range spans –55 °C to +150 °C, with derating above 25 °C ambient per Fig. 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin below breakdown. |
| VBR min/max | 86.7 V / 95.8 V - Breakdown occurs within this band at 1 mA test current; ensures predictable turn-on under surge conditions. |
| VC @ IPPM | 126 V - Clamped voltage at 23.8 A peak surge current; determines maximum stress imposed on protected downstream circuitry. |
| PPPM | 3000 W - Peak pulse power handling capability with 10/1000 μs waveform; quantifies transient energy absorption capacity. |
| Polarity | Bidirectional - Symmetric clamping for AC-coupled or floating signal lines; no polarity marking required on device body. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with 8.0 mm × 8.0 mm copper pad area recommendation for thermal management. |
| TJ max | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive and high-ambient industrial environments. |
Pinout & Package
SMC3K78CA-M3/9A uses the standard SMC (DO-214AB) package: two-terminal, symmetrical, bidirectional device with no polarity marking. Terminals are matte tin-plated leads suitable for reflow soldering per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Either terminal serves as input/output for bidirectional clamping; no fixed anode/cathode designation - device functions identically in either orientation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - enables use in engine control, ADAS, and infotainment modules. |
| UL 497B recognized | Safety certification with file E136766 confirms compliance for telecom and industrial surge protection applications requiring regulatory approval. |
| MSL Level 1 | Moisture sensitivity level 1 per J-STD-020 means unlimited floor life at ≤30 °C/85% RH - eliminates bake requirements prior to assembly. |
| Halogen-free & RoHS | M3 suffix denotes halogen-free molding compound and lead-free terminations meeting EU RoHS Directive 2011/65/EU and JEDEC JS709 standards. |
| Low clamping ratio | VC/VWM = 126 V / 78 V ≈ 1.62 - tight clamping margin minimizes overvoltage exposure to protected ICs without excessive power dissipation. |
Applications
| Automotive Powertrain ECUs | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting CAN transceiver inputs and microcontroller I/O pins from load-dump and alternator ripple-induced transients in engine control units. IC Role / Device Role: Bidirectional clamping element placed directly at connector interface to shunt surge energy before reaching silicon. Use Value: Withstands 3000 W pulses and operates up to +150 °C junction temperature, enabling robust protection in under-hood environments without derating penalties. |
Use Scenario: Safeguarding analog front-end amplifiers and ADC inputs in pressure/temperature sensor modules exposed to relay coil flyback and motor drive noise. IC Role / Device Role: Low-capacitance transient suppressor across differential signal pairs to preserve signal integrity while limiting overvoltage. Use Value: 126 V clamping voltage at 23.8 A ensures downstream op-amps remain within absolute maximum ratings during 10/1000 μs surges. |
| Telecom Line Interface Protection | Consumer Appliance Motor Control Boards |
Use Scenario: Secondary-level surge protection on Ethernet PHY or DSL line drivers subjected to induced lightning surges per IEC 61000-4-5. IC Role / Device Role: Standoff-rated TVS placed after primary gas discharge tube (GDT) to refine clamping and absorb residual energy. Use Value: UL 497B recognition and 78 V VWM allow integration into certified telecom infrastructure designs without additional safety validation. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines and HVAC blowers connected to MCU GPIOs and driver ICs. IC Role / Device Role: Surface-mount TVS mounted adjacent to motor terminals to clamp inductive kickback before propagation into control logic. Use Value: SMC package provides mechanical robustness and thermal mass for repeated 3000 W surge events typical in appliance lifetime testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMC3K75CA-M3/9A | Lower VWM (75 V) and VBR (83.3–92.1 V); VC = 121 V at 24.8 A | Slightly tighter clamping margin but reduced standoff headroom; better suited for 72 V nominal bus systems | Select when system nominal voltage is ≤72 V and lower clamping voltage is prioritized over margin. |
| SMC3K78CAHM3/9A | Identical electrical specs; HM3 suffix indicates AEC-Q101 qualification (M3 is commercial grade only) | Required for automotive production programs mandating AEC-Q101; same footprint and layout | Choose SMC3K78CAHM3/9A for new automotive designs; SMC3K78CA-M3/9A remains valid for industrial/commercial use. |
Compared with SMC3K78CA-M3/9A, SMC3K75CA-M3/9A offers lower clamping but less overvoltage margin, while SMC3K78CAHM3/9A delivers identical protection performance with certified automotive reliability - making it the direct upgrade path where AEC-Q101 compliance is mandatory.
Availability
SMC3K78CA-M3/9A is available at Aetrix Electronics and suitable for automotive powertrain modules, industrial sensor interfaces, telecom line protection circuits, and consumer appliance motor control boards requiring stable component supply and long-term manufacturability.
Supply support for SMC3K78CA-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, optoelectronics, and passive components with emphasis on high-reliability 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 robustness, safety certification, and thermal stability are critical.
FAQ
What does the "-M3/9A" suffix mean in SMC3K78CA-M3/9A?
The "M3" suffix indicates halogen-free, RoHS-compliant construction with matte tin-plated leads passing JESD 201 Class 2 whisker testing. The "/9A" denotes packaging in 13-inch diameter plastic tape and reel containing 3500 units - a standard logistics format for automated SMT placement.
Is SMC3K78CA-M3/9A suitable for automotive applications?
SMC3K78CA-M3/9A is qualified for industrial and commercial use. For automotive applications requiring AEC-Q101 certification, Vishay specifies the SMC3K78CAHM3/9A variant. While SMC3K78CA-M3/9A shares identical electrical parameters, it lacks the formal automotive qualification required by Tier 1 suppliers.
What is the maximum clamping voltage of SMC3K78CA-M3/9A and at what current is it specified?
The maximum clamping voltage (VC) of SMC3K78CA-M3/9A is 126 V, measured at the peak pulse current (IPPM) of 23.8 A using the standardized 10/1000 μs double-exponential surge waveform per ANSI/IEEE C62.35.
Can SMC3K78CA-M3/9A be used in bidirectional signal lines such as RS-485 or CAN bus?
Yes - SMC3K78CA-M3/9A is inherently bidirectional and commonly deployed across differential pairs in RS-485 transceivers and CAN FD interfaces. Its symmetrical clamping behavior and 126 V VC ensure balanced protection without polarity concerns or added circuit complexity.
What is the thermal derating behavior of SMC3K78CA-M3/9A above 25 °C ambient?
SMC3K78CA-M3/9A follows the derating curve in Figure 2 of Vishay Document #89433: peak pulse power decreases linearly from 100% at 25 °C to ~50% at 125 °C junction temperature. Designers must calculate TJ using thermal resistance and power dissipation to maintain safe operation within the –55 °C to +150 °C range.
SMC3K78CA-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):
- 78V
- Voltage - Breakdown (Min):
- 86.7V
- Voltage - Clamping (Max) @ Ipp:
- 126V
- Current - Peak Pulse (10/1000µs):
- 23.8A
- 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)
SMC3K78CA-M3/9A FAQ
1.How can I place an order for SMC3K78CA-M3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC3K78CA-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 SMC3K78CA-M3/9A reliable?
The price and inventory of SMC3K78CA-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 SMC3K78CA-M3/9A is usually 5 days.
3.What payment methods are accepted for SMC3K78CA-M3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC3K78CA-M3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC3K78CA-M3/9A?
SMC3K78CA-M3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC3K78CA-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 SMC3K78CA-M3/9A?
For technical support, including SMC3K78CA-M3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC3K78CA-M3/9A requirements.
6.How does Aetrix verify that SMC3K78CA-M3/9A is sourced from the original manufacturer or authorized distributors?
All SMC3K78CA-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 SMC3K78CA-M3/9A meets industry standards.
7.What is the process for return or replacement of SMC3K78CA-M3/9A?
All SMC3K78CA-M3/9A units undergo pre-shipment inspection (PSI). If there is an issue with SMC3K78CA-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 SMC3K78CA-M3/9A part is unused and in its original packaging.
Return procedure for SMC3K78CA-M3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC3K78CA-M3/9A Tags
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