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Vishay General Semiconductor - Diodes Division SMCG18CA-E3/9AT
- Part No.:
- SMCG18CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG18CA-E3/9AT.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,202
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Product details
Overview
SMCG18CA-E3/9AT 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 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (PPPM), clamping voltage of 29.2 V at 51.4 A, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMCG18CA-E3/9AT datasheet, SMCG18CA-E3/9AT pinout, SMCG18CA-E3/9AT application, or SMCG18CA-E3/9AT equivalent, this device is selected for high-energy transient suppression in automotive sensor interfaces, industrial I/O ports, and telecom line protection where low clamping voltage, fast response (<1 ns), and MSL Level 1 reflow compatibility are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (20.0–22.1 V), ID ≤ 1.0 μA at VWM, and VC = 29.2 V under 10/1000 μs surge. Its glass-passivated junction ensures stable leakage and low capacitance (typ. <100 pF at 0 V), while the DO-215AB package provides 75 °C/W junction-to-ambient thermal resistance.
The device sustains 51.4 A peak pulse current (IPPM) per 10/1000 μs waveform and handles 200 A unidirectional surge (IFSM) - though not applicable here due to bidirectional configuration. It meets J-STD-020 MSL Level 1 (260 °C peak) and is rated for -55 °C to +150 °C operating junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse working voltage before clamping begins |
| VBR (min/max) | 20.0 / 22.1 V at 1 mA - guaranteed breakdown threshold range for reliable turn-on margin |
| VC @ IPPM | 29.2 V at 51.4 A - clamping voltage limiting protected circuit stress during 10/1000 μs transients |
| PPPM | 1500 W - peak surge energy handling capacity under standardized lightning/surge conditions |
| ID @ VWM | ≤ 1.0 μA - ultra-low leakage preserving signal integrity in high-impedance sensor or data lines |
| TJ max. | +150 °C - enables operation in under-hood automotive or industrial ambient environments |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMCG (DO-215AB) - surface-mount, gull-wing leaded, 2-terminal case with no polarity marking for bidirectional operation. Meets UL 94 V-0, RoHS-compliant (E3 suffix), and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional terminal pair | No polarity marking; either terminal serves as anode or cathode depending on transient polarity - enables single-device protection of AC or differential lines |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control, ADAS sensors, and infotainment power rails |
| 1500 W PPPM rating | Withstands IEC 61000-4-5 Level 4 (4 kV) surges without degradation when mounted per recommended 8 mm × 8 mm copper pads |
| Low clamping ratio (VC/VBR ≈ 1.4) | Minimizes voltage overshoot during transients - critical for protecting 3.3 V or 5 V logic interfaces downstream |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without preconditioning or dry-pack requirements |
| Glass-passivated junction | Ensures long-term stability of leakage current and breakdown voltage across temperature and life cycles |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN FD or LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt transients before reaching interface ICs. Use Value: Clamps 29.2 V at 51.4 A, safeguarding 3.3 V/5 V receivers against >100 V spikes while maintaining sub-μA leakage at 18 V standby. |
Use Scenario: Shielding digital input modules in programmable logic controllers from inductive switching noise and 24 V rail transients. IC Role / Device Role / Timing Role: Primary front-end TVS on 24 V supply and discrete input channels, coordinated with series impedance for energy sharing. Use Value: 1500 W surge rating absorbs repetitive 10/1000 μs events common in factory automation, with AEC-Q101 reliability ensuring field longevity. |
| Telecom Line Interface | Consumer Power Adapter ESD/Surge |
Use Scenario: Protecting Ethernet PHYs, RS-485 transceivers, and PoE injectors from lightning-induced surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Differential-mode TVS across line pairs (e.g., A/B of RS-485), leveraging symmetrical bidirectional clamping. Use Value: Matches impedance-neutral placement with <100 pF junction capacitance, avoiding signal integrity loss at 10/100 Mbps rates. |
Use Scenario: Secondary-side overvoltage protection in USB-C PD adapters and wireless charging base stations exposed to mains-coupled surges. IC Role / Device Role / Timing Role: Final-stage clamp after primary MOV and fuse, providing precise 29.2 V clamping to protect GaN FET gate drivers and MCU supervisors. Use Value: Tight VBR tolerance (±5.5%) and low VC ensure compliance with IEC 62368-1 transient limits without overdesigning downstream components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | Same VWM (18 V) and bidirectional configuration, but lower PPPM (400 W) and higher VC (32.4 V at 12.3 A) | Restricted to lower-energy transients (e.g., ESD-only); unsuitable for IEC 61000-4-5 Level 3+ | Select SMAJ18CA only if board space is constrained and surge energy remains below 400 W capability. |
| SMCJ18CA | Identical VWM (18 V), same DO-214AB package, but higher PPPM (1500 W) and matching VC (29.2 V), yet lacks AEC-Q101 qualification | Acceptable for industrial/commercial use but requires additional qualification effort for automotive deployment | Choose SMCJ18CA for cost-sensitive non-automotive designs where AEC-Q101 is not mandated. |
Compared with SMCG18CA-E3/9AT, SMAJ18CA offers smaller footprint but significantly reduced surge handling, while SMCJ18CA matches electrical performance but omits automotive qualification - making SMCG18CA-E3/9AT the sole option when AEC-Q101 compliance and full 1500 W capability are jointly required.
Availability
SMCG18CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface circuits requiring stable component supply, AEC-Q101 assurance, and consistent 1500 W surge immunity.
Supply support for SMCG18CA-E3/9AT 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMCG series targets high-reliability transient suppression in harsh environments, with design focus on automotive-grade robustness, low-clamp performance, and seamless integration into automated SMT assembly lines.
FAQ
What is the clamping voltage of SMCG18CA-E3/9AT under standard surge conditions?
The SMCG18CA-E3/9AT exhibits a maximum clamping voltage (VC) of 29.2 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 51.4 A. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024. The low VC ensures downstream 3.3 V or 5 V ICs remain within safe operating limits during surge events. SMCG18CA-E3/9AT maintains this performance across its full operating temperature range.
Is SMCG18CA-E3/9AT suitable for automotive applications?
Yes, SMCG18CA-E3/9AT is explicitly AEC-Q101 qualified, having passed stress tests including temperature cycling, high-temperature reverse bias, and ESD per JESD22. Its DO-215AB package supports MSL Level 1 reflow, and its -55 °C to +150 °C junction temperature range aligns with under-hood and cabin automotive environments. SMCG18CA-E3/9AT is referenced in Vishay's automotive-grade TVS portfolio for sensor, bus, and power rail protection.
How does the bidirectional configuration of SMCG18CA-E3/9AT affect PCB layout?
SMCG18CA-E3/9AT has no polarity marking and functions identically in both directions, simplifying layout for AC-coupled or differential signal lines like RS-485 or CAN. No orientation check is needed during placement, reducing assembly errors. The device must be mounted on minimum 8.0 mm × 8.0 mm copper pads per terminal to achieve rated 1500 W PPPM - a requirement verified in Vishay's thermal derating curves. SMCG18CA-E3/9AT's symmetrical behavior eliminates need for duplicate unidirectional devices.
What is the leakage current specification for SMCG18CA-E3/9AT at its stand-off voltage?
At its 18 V stand-off voltage (VWM), SMCG18CA-E3/9AT guarantees a maximum reverse leakage current (ID) of 1.0 μA at 25 °C, per the Vishay datasheet. This ultra-low leakage preserves signal integrity in high-impedance sensor front-ends and battery-powered systems. Leakage remains well below 5 μA up to +125 °C, supporting stable operation in extended temperature applications. SMCG18CA-E3/9AT achieves this via glass-passivated junction technology.
Does SMCG18CA-E3/9AT require external heat sinking for 1500 W surge handling?
No - SMCG18CA-E3/9AT achieves its full 1500 W peak pulse power rating using only the specified 8.0 mm × 8.0 mm copper pad area per terminal on the PCB, with no external heatsink required. Its RθJA of 75 °C/W and RθJL of 15 °C/W are characterized under this mounting condition. Derating applies above 25 °C ambient, per Figure 2 in the Vishay datasheet. SMCG18CA-E3/9AT's thermal design assumes standard FR-4 board construction with internal ground planes.
SMCG18CA-E3/9AT 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 51.4A
- 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)
SMCG18CA-E3/9AT FAQ
1.How can I place an order for SMCG18CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG18CA-E3/9AT 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 SMCG18CA-E3/9AT reliable?
The price and inventory of SMCG18CA-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG18CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG18CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG18CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG18CA-E3/9AT?
SMCG18CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG18CA-E3/9AT 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 SMCG18CA-E3/9AT?
For technical support, including SMCG18CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG18CA-E3/9AT requirements.
6.How does Aetrix verify that SMCG18CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG18CA-E3/9AT 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 SMCG18CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG18CA-E3/9AT?
All SMCG18CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG18CA-E3/9AT, 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 SMCG18CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCG18CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG18CA-E3/9AT Tags
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