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Vishay General Semiconductor - Diodes Division SMCG78CA-M3/9AT
- Part No.:
- SMCG78CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG78CA-M3/9AT.pdf
- Description:
- TVS DIODE 78VWM 126VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,448
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Product details
Overview
SMCG78CA-M3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 78 V stand-off voltage (VWM), 86.7–95.8 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), clamping voltage of 126 V at 11.9 A IPPM, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMCG78CA-M3/9AT datasheet, SMCG78CA-M3/9AT pinout, SMCG78CA-M3/9AT application, or SMCG78CA-M3/9AT equivalent, this device is selected for high-energy surge suppression in automotive power lines, industrial sensor interfaces, and bidirectional signal line protection where low clamping ratio, halogen-free compliance, and MSL Level 1 reflow capability are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (86.7 V / 95.8 V), ID ≤ 1.0 µA at VWM = 78 V, and VC = 126 V at IPPM = 11.9 A under 10/1000 µs waveform. Its glass-passivated junction ensures stable leakage and fast response (< 1 ns), while the DO-215AB package supports automated placement and meets UL 94 V-0 flammability.
Thermal performance is defined by RθJA = 75 °C/W and RθJL = 15 °C/W, enabling reliable operation up to TJ = 150 °C. The M3 suffix confirms halogen-free, RoHS-compliant construction with matte tin-plated leads qualified to JESD 201 Class 2 whisker resistance and J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry. |
| VBR (min/max) | 86.7 V / 95.8 V at IT = 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during transients. |
| VC @ IPPM | 126 V at 11.9 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream components. |
| PPPM | 1500 W - Peak pulse power handling per single transient; enables protection against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | ≤ 1.0 µA - Reverse leakage current at rated stand-off; ensures minimal standby power loss and signal integrity. |
| TJ max. | +150 °C - Maximum junction temperature; supports under-hood automotive and high-ambient industrial environments. |
| Package | SMCG (DO-215AB) - Surface-mount gull-wing package with 8.0 mm × 8.0 mm copper pad layout; optimized for thermal dissipation and automated assembly. |
Pinout & Package
SMCG78CA-M3/9AT uses the SMCG (DO-215AB) surface-mount package: a symmetrical, bidirectional device with no polarity marking. Terminals are matte tin-plated gull-wing leads compatible with standard reflow profiles (MSL Level 1, peak 260 °C). No cathode/anode designation applies - both terminals function identically.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Bidirectional Anode/Cathode | Identical terminal for symmetrical surge conduction; connects to either side of protected line without polarity constraint. |
| Terminal 2 | Bidirectional Anode/Cathode | Identical terminal for symmetrical surge conduction; enables placement across differential or AC-coupled signal paths. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS, and body electronics. |
| Halogen-free (M3 suffix) | Meets IEC 61249-2-21 and JEDEC JS709C requirements; eliminates brominated flame retardants without compromising UL 94 V-0 rating. |
| Low incremental surge resistance | Enables tight clamping ratio (VC/VBR ≈ 1.31) - minimizes voltage overshoot during fast transients like ISO 7637-2 pulses. |
| Glass passivated junction | Provides stable leakage performance and long-term parameter consistency across humidity and thermal stress conditions. |
| MSL Level 1 | Unlimited floor life at ≤ 30 °C / 60 % RH; supports standard SMT assembly without dry-pack or baking requirements. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients per ISO 16750-2. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed across power rail input to divert surge energy to ground. Use Value: Withstands 1500 W peak pulses and clamps to 126 V, preventing damage to downstream DC/DC converters and microcontrollers. |
Use Scenario: Safeguarding RS-485 or CAN FD transceivers connected to long cable runs in factory automation systems. IC Role / Device Role / Timing Role: Differential-line TVS mounted across A/B bus lines to suppress EFT and lightning-induced surges. Use Value: Symmetrical clamping ensures equal protection for both signal polarities, preserving signal integrity during ±1 kV EFT bursts. |
| Telecom DSL Line Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Shielding ADSL/VDSL line drivers from induced surges on outdoor copper pairs exposed to lightning coupling. IC Role / Device Role / Timing Role: Bidirectional TVS installed between tip/ring and ground in front-end filter stage. Use Value: 78 V VWM aligns with typical DSL line DC bias; 126 V VC limits stress on upstream transformer and PHY ICs. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, blenders). IC Role / Device Role / Timing Role: Clamp placed across motor terminals to absorb inductive kickback during PWM switching. Use Value: Fast <1 ns response captures high-dI/dt events; 1500 W rating handles repeated 100 A surge peaks without degradation. |
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-E3/57T | Same VWM (78 V), lower PPPM (400 W), SMA (DO-214AC) package with higher RθJA (110 °C/W). | Limited to lower-energy transients; unsuitable for ISO 7637-2 or IEC 61000-4-5 Level 4. | Select when cost or board space is critical and surge energy remains below 400 W. |
| SMCJ78CA-M3 | Same VWM (78 V), higher PPPM (1500 W), but SMC (DO-214AB) package with larger footprint and higher thermal mass. | Better sustained surge handling; requires larger PCB pads and may limit routing density. | Choose for legacy designs using SMC footprints or where enhanced thermal margin is prioritized over miniaturization. |
Compared with SMCG78CA-M3/9AT, SMAJ78CA-E3/57T offers reduced surge capacity in a smaller package, while SMCJ78CA-M3 delivers identical power rating in a physically larger, thermally robust form factor - making SMCG78CA-M3/9AT the optimal balance of high-energy protection, compact DO-215AB layout, and automotive qualification.
Availability
SMCG78CA-M3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom line surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMCG78CA-M3/9AT 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 validation.
The SMCG series targets high-reliability transient suppression in space-constrained, high-surge environments - engineered specifically for automotive, industrial, and telecom applications demanding AEC-Q101 compliance and halogen-free construction.
FAQ
What is the clamping voltage of SMCG78CA-M3/9AT at its rated peak pulse current?
The SMCG78CA-M3/9AT has a maximum clamping voltage (VC) of 126 V at its specified peak pulse current (IPPM) of 11.9 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping ratio (VC/VBR) is approximately 1.31, confirming effective transient suppression performance for the SMCG78CA-M3/9AT.
Is SMCG78CA-M3/9AT suitable for automotive applications?
Yes, SMCG78CA-M3/9AT is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments. Its 150 °C maximum junction temperature, halogen-free M3 construction, MSL Level 1 reflow compatibility, and validated performance against temperature cycling and HTRB testing make it appropriate for engine control units, body electronics, and ADAS subsystems. The SMCG78CA-M3/9AT meets the reliability and safety expectations of automotive Tier 1 suppliers.
What does the "CA" suffix indicate in SMCG78CA-M3/9AT?
The "CA" suffix in SMCG78CA-M3/9AT denotes a bidirectional configuration - meaning the device provides symmetrical transient voltage suppression in both polarities, with identical breakdown and clamping characteristics across either terminal. Unlike unidirectional variants (e.g., SMCG78A), the CA version has no polarity marking and is used where AC signals, differential buses, or reversible power connections require balanced protection. This is confirmed in Vishay's documentation for all CA-suffixed SMCG devices.
What is the thermal resistance of SMCG78CA-M3/9AT, and how does it affect PCB layout?
The SMCG78CA-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W, measured on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad layout per terminal. To achieve rated power dissipation (6.5 W at TA = 50 °C) and avoid thermal runaway, PCB design must replicate these pad dimensions and ensure adequate copper area and via stitching. Deviations reduce thermal margin and may derate the SMCG78CA-M3/9AT's surge capability.
How does the M3 suffix differ from E3 in SMCG78CA-M3/9AT?
The M3 suffix in SMCG78CA-M3/9AT specifies halogen-free, RoHS-compliant construction meeting IEC 61249-2-21 and JEDEC JS709C, whereas E3 indicates standard RoHS compliance without halogen-free assurance. Both meet industrial grade requirements, but M3 is mandatory for automotive and green-electronics programs requiring bromine/chlorine restrictions. The SMCG78CA-M3/9AT also carries JESD 201 Class 2 whisker resistance certification - a distinction not guaranteed with E3 variants.
SMCG78CA-M3/9AT 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-M3/9AT FAQ
1.How can I place an order for SMCG78CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG78CA-M3/9AT 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-M3/9AT reliable?
The price and inventory of SMCG78CA-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG78CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG78CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG78CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG78CA-M3/9AT?
SMCG78CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG78CA-M3/9AT 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-M3/9AT?
For technical support, including SMCG78CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG78CA-M3/9AT requirements.
6.How does Aetrix verify that SMCG78CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG78CA-M3/9AT 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-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG78CA-M3/9AT?
All SMCG78CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG78CA-M3/9AT, 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-M3/9AT part is unused and in its original packaging.
Return procedure for SMCG78CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG78CA-M3/9AT Tags
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