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Vishay General Semiconductor - Diodes Division SMCG78CA-E3/57T
- Part No.:
- SMCG78CA-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG78CA-E3/57T.pdf
- Description:
- TVS DIODE 78VWM 126VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,337
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Product details
Overview
SMCG78CA-E3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) in the SMCG (DO-215AB) surface-mount package, designed for clamping voltage transients on signal or 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 protecting automotive sensor interfaces against load dump and ESD events.
For engineers reviewing the SMCG78CA-E3/57T datasheet, SMCG78CA-E3/57T pinout, SMCG78CA-E3/57T application, or SMCG78CA-E3/57T equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, MSL Level 1 rating, low incremental surge resistance, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This device operates as a bidirectional avalanche diode, leveraging glass-passivated junction technology to deliver symmetrical breakdown behavior in both polarities. Its VBR range is 86.7 V (min) to 95.8 V (max) at 1.0 mA test current, with reverse leakage ID ≤ 1.0 µA at VWM = 78 V - ensuring minimal standby power loss in always-on automotive modules.
The thermal design relies on low RθJL = 15 °C/W (junction-to-lead) and RθJA = 75 °C/W (junction-to-ambient on recommended pad layout), enabling reliable operation up to TJ = +150 °C. It meets J-STD-020 MSL Level 1 and withstands 260 °C lead-free reflow peak temperature without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for 12 V/24 V automotive supply rails. |
| VBR (min/max) | 86.7 V / 95.8 V - Breakdown occurs within this band at 1.0 mA; ensures predictable turn-on margin above VWM for robust overvoltage immunity. |
| VC @ IPPM | 126 V - Clamped voltage at 11.9 A peak pulse current; limits downstream IC stress during ISO 7637-2 Pulse 1/2a/5a transients. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 µs waveform; supports high-energy surge suppression without failure. |
| ID @ VWM | ≤ 1.0 µA - Reverse leakage at rated stand-off voltage; negligible current draw in battery-sensitive applications like CAN nodes. |
| TJ max. | +150 °C - Maximum junction temperature; enables deployment in under-hood ECUs and motor control units. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMCG (DO-215AB) - low-profile, gull-wing surface-mount case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A | One side of bidirectional avalanche junction; no polarity marking required - symmetric conduction in either direction. |
| Cathode | Terminal K | Other side of bidirectional avalanche junction; electrically identical to Anode due to CA suffix configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., LIN bus, analog sensor outputs) without external polarity management. |
| AEC-Q101 qualification | Confirms suitability for automotive powertrain, chassis, and body electronics where field reliability and lifetime validation are mandatory. |
| MSL Level 1 rating | Allows unlimited floor life and exposure to standard SMT reflow profiles up to 260 °C peak - eliminates baking requirements pre-assembly. |
| Glass passivated junction | Provides stable breakdown characteristics over temperature and lifetime, with reduced parameter drift versus epoxy-passivated alternatives. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 16750-2 jump-start pulses), improving system-level immunity margin. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure or temperature sensors in engine control modules exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS placed across sensor output and ground to clamp ±100 V transients before they reach ADC input stages. Use Value: Prevents latch-up or permanent damage to precision op-amps and SAR ADCs while maintaining signal integrity below 78 V nominal range. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers interfacing with industrial solenoids and contactors. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between input terminal and common rail to absorb inductive kickback energy from switched loads. Use Value: Eliminates need for external RC snubbers or relay contact protection, reducing BOM count and PCB area in DIN-rail mounted controllers. |
| Automotive LIN Bus Protection | Telecom Power Interface |
|
Use Scenario: Shielding LIN transceiver pins (e.g., TJA1020) from ESD and battery reversal events in door module networks. IC Role / Device Role / Timing Role: Low-capacitance bidirectional suppressor placed directly at connector entry point to limit line voltage to <126 V during transients. Use Value: Maintains LIN signal rise/fall times (<20 ns) while meeting ISO 10605 ±8 kV contact discharge requirements without data corruption. |
Use Scenario: Guarding 48 V DC power inputs of VoIP gateways and base station remote units against lightning-induced surges on telecom lines. IC Role / Device Role / Timing Role: Primary-stage TVS on DC input rail upstream of DC/DC converters to divert >1500 W surge energy away from regulation circuitry. Use Value: Enables compliance with ITU-T K.20/21 immunity standards using a single discrete component instead of multi-stage protection schemes. |
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); SMA (DO-214AC) package with higher RθJA (110 °C/W). | Not AEC-Q101 qualified; limited to commercial/industrial use; unsuitable for under-hood automotive deployment. | Select when cost sensitivity outweighs automotive qualification and thermal performance requirements. |
| 1.5KE78CA | Higher PPPM (1500 W), same VWM/VC, but axial-leaded DO-15 package; no MSL rating or automated placement support. | Requires manual assembly or wave soldering; incompatible with high-volume SMT lines and compact PCB layouts. | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with SMAJ78CA and 1.5KE78CA, the SMCG78CA-E3/57T uniquely combines AEC-Q101 qualification, MSL Level 1 reflow readiness, and DO-215AB low-profile packaging - making it the only option qualified for automated production of thermally constrained automotive modules requiring 1500 W surge handling.
Availability
SMCG78CA-E3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, LIN bus nodes, and telecom DC power inputs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMCG78CA-E3/57T 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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMCG series was developed specifically for high-reliability automotive and industrial transient suppression, emphasizing AEC-Q101 compliance, low-profile SMT compatibility, and consistent clamping performance across temperature and lifetime.
FAQ
What is the clamping voltage of SMCG78CA-E3/57T at its rated peak pulse current?
The SMCG78CA-E3/57T has a maximum clamping voltage (VC) of 126 V at its specified peak pulse current (IPPM) of 11.9 A, measured with a 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and ensures downstream components remain within safe voltage limits during standardized surge events such as ISO 7637-2 Pulse 5a. The SMCG78CA-E3/57T achieves this with low incremental surge resistance inherent to its glass-passivated junction structure.
Is SMCG78CA-E3/57T suitable for automotive applications requiring AEC-Q101 qualification?
Yes, the SMCG78CA-E3/57T is explicitly AEC-Q101 qualified, as confirmed in Vishay's official documentation (Document Number: 88457, Revision: 09-Jan-2024). This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD robustness - validating its use in engine control units, body electronics, and ADAS sensor modules. The SMCG78CA-E3/57T carries the HE3/HE3-compatible suffix indicating AEC-Q101 compliance in its ordering code structure.
What is the package type and mounting compatibility of SMCG78CA-E3/57T?
The SMCG78CA-E3/57T uses the SMCG (DO-215AB) surface-mount package - a low-profile gull-wing outline with 0.058" (1.47 mm) lead width and 0.310" × 0.380" (7.87 mm × 9.64 mm) body dimensions. It is fully compatible with automated pick-and-place equipment and standard lead-free reflow profiles (MSL Level 1, peak 260 °C). The SMCG78CA-E3/57T mounts on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for optimal thermal and surge performance.
How does the bidirectional design of SMCG78CA-E3/57T affect its circuit implementation?
The CA suffix denotes bidirectional construction, meaning the SMCG78CA-E3/57T exhibits symmetrical avalanche behavior in both polarities - eliminating the need for polarity-aware placement or additional components in AC-coupled or floating circuits. Unlike unidirectional TVS diodes, the SMCG78CA-E3/57T requires no cathode band identification and functions identically regardless of orientation across protected lines, simplifying layout and reducing assembly errors in differential or isolated interfaces like LIN or RS-485.
What is the maximum operating junction temperature and thermal resistance of SMCG78CA-E3/57T?
The SMCG78CA-E3/57T has a maximum junction temperature (TJ max.) of +150 °C and typical thermal resistances of RθJL = 15 °C/W (junction-to-lead) and RθJA = 75 °C/W (junction-to-ambient on recommended 8.0 mm × 8.0 mm copper pads). These values enable sustained operation in under-hood environments and allow designers to calculate safe power derating above 25 °C ambient using Vishay's Fig. 2 derating curve. The SMCG78CA-E3/57T maintains full 1500 W surge capability only when mounted per specified pad layout.
SMCG78CA-E3/57T 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-E3/57T FAQ
1.How can I place an order for SMCG78CA-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG78CA-E3/57T 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-E3/57T reliable?
The price and inventory of SMCG78CA-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG78CA-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCG78CA-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG78CA-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG78CA-E3/57T?
SMCG78CA-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG78CA-E3/57T 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-E3/57T?
For technical support, including SMCG78CA-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG78CA-E3/57T requirements.
6.How does Aetrix verify that SMCG78CA-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCG78CA-E3/57T 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-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCG78CA-E3/57T?
All SMCG78CA-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCG78CA-E3/57T, 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-E3/57T part is unused and in its original packaging.
Return procedure for SMCG78CA-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG78CA-E3/57T Tags
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