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Vishay General Semiconductor - Diodes Division SMCG78CAHE3/57T
- Part No.:
- SMCG78CAHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG78CAHE3/57T.pdf
- Description:
- TVS DIODE 78VWM 126VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,755
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Product details
Overview
SMCG78CAHE3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) surface-mount package, designed for high-energy surge protection in automotive and industrial electronics. It features a 78 V stand-off voltage (VWM), 1500 W peak pulse power (PPPM), clamping voltage of 126 V at 11.9 A IPPM, and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SMCG78CAHE3/57T datasheet, SMCG78CAHE3/57T pinout, SMCG78CAHE3/57T application, or SMCG78CAHE3/57T equivalent, this device is selected for robust ESD and lightning surge protection on 12 V/24 V power rails, sensor interfaces, and CAN/LIN bus lines where low clamping ratio and MSL Level 1 reliability are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified at 86.7–95.8 V (min/max) at 1 mA test current, ensuring consistent clamping behavior during positive and negative transients. Its glass-passivated junction delivers fast response time (<1 ns) and low incremental surge resistance, critical for protecting sensitive downstream ICs from ISO 7637-2 pulse 1, 2a, 3a/b, and IEC 61000-4-5 surges.
The device is rated for TJ = –55 °C to +150 °C operation, with thermal resistance RθJA = 75 °C/W (on 8.0 mm × 8.0 mm copper pads), enabling stable performance in thermally constrained automotive ECUs. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102, supporting lead-free reflow up to 260 °C peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; sets protection threshold for 12 V/24 V systems. |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - Ensures reliable turn-on margin above VWM while avoiding false triggering. |
| VC @ IPPM | 126 V at 11.9 A - Clamped voltage during 10/1000 µs surge; limits stress on protected circuitry. |
| PPPM | 1500 W - Peak transient energy absorption capability per single event; meets ISO 7637-2 Level 5. |
| ID @ VWM | 1.0 µA - Ultra-low leakage preserves system standby current in battery-powered modules. |
| TJ max. | +150 °C - Enables placement near heat sources in engine control units and ADAS domains. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD. |
Pinout & Package
Package: SMCG (DO-215AB) - Low-profile, dual-leaded surface-mount package with 0.220–0.245 inch body length, 0.115–0.125 inch width, and 0.024–0.040 inch height; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A (bidirectional) | One side of symmetrical PN junction; no polarity marking; connects to line under protection. |
| Cathode | Terminal K (bidirectional) | Other side of symmetrical PN junction; no polarity marking; connects to line under protection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 1500 W PPPM rating | Withstands high-energy transients such as load dump (ISO 7637-2 pulse 5a) without degradation. |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, chassis, and body electronics per stress test requirements. |
| MSL Level 1 (260 °C) | Allows standard SMT reflow without moisture sensitivity handling or baking prior to assembly. |
| Glass passivated junction | Provides stable VBR over lifetime and immunity to humidity-induced parameter drift. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V supply inputs in engine control units against load dump and alternator transients. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC/DC converters and microcontrollers. Use Value: Limits rail voltage to ≤126 V during 1500 W surges, preventing latch-up or burnout of downstream PMICs and MCUs. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Fast-response shunt protector located at connector entry point. Use Value: Sub-1 ns response and <1.0 µA leakage preserve signal integrity and battery life in always-on sensor nodes. |
| CAN Bus Transient Suppression | Telecom Line Interface Protection |
Use Scenario: Safeguarding CANH/CANL differential pair in vehicle networking modules exposed to board-level EFT and surge. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential lines with minimal parasitic capacitance. Use Value: Symmetrical 78 V VWM and 126 V VC maintain CAN signal eye diagram integrity during ISO 11898-2 compliant transients. |
Use Scenario: Protecting RS-485/RS-422 data lines in industrial gateways connected to long external cables. IC Role / Device Role / Timing Role: Line-to-line and line-to-ground surge clamp in telecom interface stage. Use Value: 1500 W rating handles IEC 61000-4-5 combination wave surges (10/700 µs) without failure or parameter shift. |
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 PPPM (1500 W), but SMA (DO-214AC) package; higher RθJA (95 °C/W). | Larger footprint and lower thermal performance; suitable only when PCB space allows and power dissipation is lower. | Select SMAJ78CA only if DO-215AB mounting is incompatible with existing layout or reflow profile constraints. |
| SMCJ78CA | Same VWM and PPPM, but SMC (DO-214AB) package; RθJA = 50 °C/W, higher IFSM (400 A vs. 200 A). | Better thermal handling and surge current margin; requires larger pad area (10.16 mm × 7.87 mm vs. 8.0 mm × 8.0 mm). | Choose SMCJ78CA when higher sustained surge duty cycle or elevated ambient temperatures (>105 °C) demand improved thermal derating. |
Compared with SMCG78CAHE3/57T, SMAJ78CA offers identical electrical specs but inferior thermal performance due to smaller copper pad compatibility, while SMCJ78CA provides superior thermal and surge robustness at the cost of larger board area-making SMCG78CAHE3/57T the optimal balance of compactness, AEC-Q101 compliance, and 1500 W protection in space-constrained automotive modules.
Availability
SMCG78CAHE3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor conditioning, and CAN/LIN bus protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMCG78CAHE3/57T 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SMCG series was engineered specifically for high-reliability transient suppression in automotive and harsh-environment industrial applications, combining AEC-Q101 validation, low-profile packaging, and precise bidirectional clamping performance.
FAQ
What is the clamping voltage of SMCG78CAHE3/57T and how is it measured?
The SMCG78CAHE3/57T has a maximum clamping voltage (VC) of 126 V at 11.9 A peak pulse current (IPPM), tested with a 10/1000 µs waveform per IEC 61000-4-5. This value represents the upper voltage limit imposed on protected circuitry during standardized surge events and is verified under JEDEC-defined conditions using 8.0 mm × 8.0 mm copper pads per terminal.
Is SMCG78CAHE3/57T suitable for automotive applications?
Yes, SMCG78CAHE3/57T is AEC-Q101 qualified and rated for operation from –55 °C to +150 °C, making it suitable for under-hood and chassis-mounted automotive electronics. Its bidirectional architecture, 1500 W PPPM rating, and MSL Level 1 reflow compatibility meet key requirements for engine control units, ADAS sensors, and body control modules.
What does the "HE3" suffix mean in SMCG78CAHE3/57T?
The "HE3" suffix indicates RoHS-compliant construction with AEC-Q101 qualification and matte tin-plated leads. "H" denotes AEC-Q101 qualification, "E3" specifies RoHS compliance and industrial-grade reliability, distinguishing it from non-automotive variants like "E3" (RoHS only) or "HM3" (halogen-free + AEC-Q101).
How does SMCG78CAHE3/57T differ from unidirectional SMCG78A variants?
SMCG78CAHE3/57T is bidirectional with symmetrical breakdown and clamping in both polarities, while SMCG78A is unidirectional and features a cathode band marking. The CA version supports AC-coupled or floating signal lines (e.g., CAN bus), whereas the A version is used on DC rails where polarity is fixed and forward conduction may be needed.
What is the recommended PCB pad layout for SMCG78CAHE3/57T?
Vishay specifies a minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad per terminal for thermal and surge performance. This layout achieves the published RθJA of 75 °C/W and supports full 1500 W PPPM rating. Smaller pads increase thermal resistance and reduce surge current handling, potentially causing premature failure during repeated transients.
SMCG78CAHE3/57T 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCG)
SMCG78CAHE3/57T FAQ
1.How can I place an order for SMCG78CAHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG78CAHE3/57T 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 SMCG78CAHE3/57T reliable?
The price and inventory of SMCG78CAHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG78CAHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCG78CAHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG78CAHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG78CAHE3/57T?
SMCG78CAHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG78CAHE3/57T 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 SMCG78CAHE3/57T?
For technical support, including SMCG78CAHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG78CAHE3/57T requirements.
6.How does Aetrix verify that SMCG78CAHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCG78CAHE3/57T 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 SMCG78CAHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCG78CAHE3/57T?
All SMCG78CAHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCG78CAHE3/57T, 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 SMCG78CAHE3/57T part is unused and in its original packaging.
Return procedure for SMCG78CAHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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