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Vishay General Semiconductor - Diodes Division SMCG78CA-M3/57T
- Part No.:
- SMCG78CA-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG78CA-M3/57T.pdf
- Description:
- TVS DIODE 78VWM 126VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,782
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Product details
Overview
SMCG78CA-M3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for robust overvoltage protection on signal and power lines. It features a 78 V stand-off voltage (VWM), 126 V maximum clamping voltage (VC) at 11.9 A peak pulse current (IPPM), and 1500 W peak pulse power dissipation (PPPM) with a 10/1000 µs waveform - suitable for automotive sensor line protection against load dump and ESD events.
For engineers reviewing the SMCG78CA-M3/57T datasheet, SMCG78CA-M3/57T pinout, SMCG78CA-M3/57T application, or SMCG78CA-M3/57T equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, halogen-free RoHS compliance (M3 suffix), 150 °C max junction temperature, and DO-215AB thermal performance with RθJA = 75 °C/W.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 78 V), but conducts heavily when transient voltage exceeds its breakdown threshold (VBR min = 86.7 V, max = 95.8 V at 1 mA). Its bidirectional architecture ensures symmetrical clamping in both polarities without polarity marking.
The SMCG78CA-M3/57T uses a glass-passivated silicon junction for stable avalanche behavior and fast response (<1 ns), with low incremental surge resistance enabling effective energy diversion during 8.3 ms surges up to 200 A (IFSM, unidirectional only - not applicable here due to bidirectional configuration).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - maximum continuous reverse operating voltage before significant conduction begins |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - guaranteed avalanche initiation range defining turn-on consistency |
| VC @ IPPM | 126 V at 11.9 A - clamping voltage limiting downstream circuit stress during standardized 10/1000 µs transients |
| PPPM | 1500 W - peak transient power handling capacity under defined waveform, critical for surge margin |
| TJ max | +150 °C - enables operation in under-hood automotive environments without derating below ambient |
| Package | SMCG (DO-215AB) - surface-mount outline with 0.31" × 0.31" copper pad requirement for thermal management |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
SMCG78CA-M3/57T uses the SMCG (DO-215AB) surface-mount package: dual-terminal, symmetrical gull-wing leads, no polarity marking (bidirectional), matte tin-plated terminals solderable per J-STD-002/JESD 22-B102, MSL Level 1 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically - voltage clamping occurs across terminals regardless of polarity |
| Case (body) | Thermal interface | Non-electrical; requires 0.31" × 0.31" copper pads per terminal for specified RθJA = 75 °C/W |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules requiring long-term field reliability |
| Halogen-free & RoHS compliant (M3) | Meets global environmental regulations and JEDEC JESD201 Class 2 whisker resistance requirements |
| Low RθJA (75 °C/W) | Supports sustained 6.5 W power dissipation at TA = 50 °C with minimal PCB area |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
Applications
| Automotive Sensor Interface Protection | Industrial CAN Bus Transceivers |
|---|---|
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) in engine control units exposed to ISO 7637-2 pulse 1/2a/5a transients. IC Role / Device Role / Timing Role: Shunt TVS placed between signal line and ground to clamp induced spikes before reaching ADC input or op-amp buffer. Use Value: Limits voltage seen by downstream IC to ≤126 V during 1500 W surges, preserving signal integrity and preventing latch-up. | Use Scenario: Safeguarding CANH/CANL differential pair in industrial gateways subjected to EFT bursts and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamping device installed across CAN bus lines to suppress common-mode transients while maintaining signal swing. Use Value: Symmetrical 78 V stand-off and 126 V clamping preserve CAN signaling margins (±2.5 V differential) during 10/1000 µs events. |
| Telecom Line Interface | Consumer Power Adapter Feedback Loop |
Use Scenario: Protecting RS-485 transceiver I/O pins in base station backhaul equipment connected to outdoor cabling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on data lines, coordinated with secondary GDT or polymer PTC for multi-stage surge defense. Use Value: Fast <1 ns response captures initial surge edge; 1500 W rating handles IEC 61000-4-5 combination wave (10/700 µs) energy. | Use Scenario: Securing optocoupler feedback path in isolated AC/DC adapters against output overvoltage faults and transformer ringing. IC Role / Device Role / Timing Role: Clamp placed across optocoupler input LED to prevent destructive forward overvoltage during regulation failure. Use Value: 78 V VWM avoids false triggering during normal 5–24 V feedback voltages; 126 V VC limits stress on 50 V-rated LED. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ78CA | Same VWM (78 V) and VC (126 V), but lower PPPM (400 W) and smaller SMA (DO-214AC) package with higher RθJA (110 °C/W) | Limited to lower-energy transients; unsuitable for automotive load dump where 1500 W capability is required | Select SMAJ78CA only for space-constrained consumer applications with verified <400 W surge exposure |
| SMCJ78CA | Identical electrical specs (78 V VWM, 126 V VC, 1500 W PPPM) and DO-214AB package, but uses E3 (non-halogen-free) termination | No AEC-Q101 qualification; lacks halogen-free certification required for Tier 1 automotive BOMs | Choose SMCJ78CA for industrial use where halogen-free is not mandated, but verify qualification status per program requirements |
Compared with SMCG78CA-M3/57T, SMAJ78CA trades surge robustness for footprint reduction, while SMCJ78CA matches performance but omits halogen-free and AEC-Q101 compliance - making SMCG78CA-M3/57T the sole option meeting full automotive environmental and reliability mandates.
Availability
SMCG78CA-M3/57T is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus interfaces, telecom line guarding, and consumer power adapter feedback loop safeguarding requiring stable component supply and AEC-Q101 assurance.
Supply support for SMCG78CA-M3/57T 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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with emphasis on reliability, precision, and application-specific optimization.
The SMCG series targets high-energy transient suppression in harsh environments, specifically engineered for automotive, industrial, and telecom systems demanding AEC-Q101 validation and 1500 W surge capability in compact surface-mount form.
FAQ
What is the clamping voltage of SMCG78CA-M3/57T and how is it measured?
The SMCG78CA-M3/57T has a maximum clamping voltage (VC) of 126 V, measured at 11.9 A peak pulse current (IPPM) using the standardized 10/1000 µs double-exponential transient waveform. This value reflects worst-case voltage imposed on protected circuitry during surge events and is guaranteed across temperature and production lot variations per Vishay's 88457 specification.
Is SMCG78CA-M3/57T suitable for automotive applications?
Yes, SMCG78CA-M3/57T is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments with operating junction temperatures up to +150 °C. Its halogen-free (M3) construction, glass-passivated junction, and 1500 W surge rating meet stringent OEM requirements for sensor, CAN, and power module protection - confirmed in Vishay document 88457.
Does SMCG78CA-M3/57T have polarity markings?
No, SMCG78CA-M3/57T is a bidirectional TVS diode and carries no polarity marking on the package. The SMCG (DO-215AB) case is symmetrical, and both terminals perform identically - clamping occurs across the device regardless of voltage polarity, eliminating orientation concerns during automated placement.
What is the thermal resistance of SMCG78CA-M3/57T and how does it affect layout?
SMCG78CA-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To achieve this rating, PCB layout must allocate minimum pad area per lead; reducing pad size increases RθJA and risks exceeding 150 °C junction temperature under 6.5 W continuous dissipation.
How does the M3 suffix differ from E3 in SMCG78CA-M3/57T?
The M3 suffix denotes halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance, whereas E3 indicates RoHS compliance without halogen-free assurance. Both meet industrial grade requirements, but SMCG78CA-M3/57T satisfies stricter environmental mandates (e.g., automotive Tier 1 BOMs) where brominated flame retardants are prohibited - verified in Vishay's ordering information table.
SMCG78CA-M3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AB, SMC Gull Wing
- 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):
- 11.9A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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 (SMCG)
SMCG78CA-M3/57T FAQ
1.How can I place an order for SMCG78CA-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG78CA-M3/57T 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 SMCG78CA-M3/57T reliable?
The price and inventory of SMCG78CA-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG78CA-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCG78CA-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG78CA-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG78CA-M3/57T?
SMCG78CA-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG78CA-M3/57T 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 SMCG78CA-M3/57T?
For technical support, including SMCG78CA-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG78CA-M3/57T requirements.
6.How does Aetrix verify that SMCG78CA-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCG78CA-M3/57T 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 SMCG78CA-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCG78CA-M3/57T?
All SMCG78CA-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCG78CA-M3/57T, 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 SMCG78CA-M3/57T part is unused and in its original packaging.
Return procedure for SMCG78CA-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG78CA-M3/57T Tags
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