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Vishay General Semiconductor - Diodes Division SMCG18CAHE3/9AT
- Part No.:
- SMCG18CAHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG18CAHE3/9AT.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,822
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Product details
Overview
SMCG18CAHE3/9AT 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 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (PPPM), and clamps transients to ≤32.4 V at 46.3 A (10/1000 µs waveform). It is AEC-Q101 qualified and used to protect automotive sensor signal lines against inductive switching surges.
For engineers reviewing the SMCG18CAHE3/9AT datasheet, SMCG18CAHE3/9AT pinout, SMCG18CAHE3/9AT application, or SMCG18CAHE3/9AT equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification status, and real-world use cases in automotive and industrial signal-line protection.
Technical Context
This device operates as a bidirectional avalanche diode, symmetrically clamping voltage transients in both polarities with identical VBR min/max (20.0–22.1 V) and VC (≤32.4 V at IPPM). Its glass-passivated junction ensures stable breakdown characteristics and low leakage (ID ≤ 1.0 µA at VWM).
Designed for surface-mount automated placement, it uses the SMCG (DO-215AB) package with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102, and meets MSL Level 1 (peak reflow 260 °C). Thermal performance is defined by RθJA = 75 °C/W and RθJL = 15 °C/W on standard 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - Ensures reliable, repeatable avalanche initiation across production lots |
| VC @ IPPM | ≤32.4 V at 46.3 A (10/1000 µs) - Limits protected circuit voltage during surge events |
| PPPM | 1500 W - Sustains high-energy transients without failure under standardized test conditions |
| ID @ VWM | ≤1.0 µA - Minimizes standby power loss and avoids false triggering in low-current circuits |
| TJ max. | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures |
| RθJA | 75 °C/W - Defines thermal derating on standard PCB pad layout (8.0 mm × 8.0 mm copper) |
Pinout & Package
Package: SMCG (DO-215AB) - Low-profile, gull-wing surface-mount package with dual terminals; no polarity marking for bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | One terminal of symmetrical avalanche junction; conducts when voltage exceeds +VBR |
| Cathode | Transient current entry (negative half-cycle) | Second terminal of symmetrical junction; conducts when voltage exceeds –VBR - functionally identical to Anode in bidirectional mode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated reliability for automotive applications including engine control, ADAS sensors, and infotainment interfaces |
| Glass passivated junction | Stable VBR tolerance and low leakage over temperature and lifetime, critical for long-term field operation |
| MSL Level 1 rating | Enables single-pass reflow assembly without moisture-related popcorn failure |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a) |
| UL 94 V-0 molding compound | Meets flammability safety requirements for enclosed industrial and automotive modules |
Applications
| Automotive Sensor Protection | Industrial I/O Signal Lines |
|---|---|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) in engine control units from load-dump and inductive kickback. IC Role / Device Role / Timing Role: Bidirectional clamping TVS placed directly at connector or IC input pins to shunt surge energy before it reaches downstream circuitry. Use Value: Clamps transients to ≤32.4 V while maintaining <1.0 µA leakage at 18 V, preserving signal integrity and enabling AEC-Q101-compliant system certification. | Use Scenario: Safeguarding RS-485, CAN FD, or 4–20 mA transmitter inputs in PLC modules exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on differential or single-ended signal paths, operating symmetrically across polarity reversals. Use Value: Delivers 1500 W peak pulse power handling with 75 °C/W thermal resistance, allowing sustained protection without thermal runaway on standard PCB layouts. |
| Consumer Power Adapter Interfaces | Telecom Line Card Surge Protection |
Use Scenario: Input-stage protection for USB-C PD or AC/DC adapter secondary-side circuits subjected to accidental AC line transients. IC Role / Device Role / Timing Role: Standoff-rated (18 V) bidirectional clamp that remains non-conductive during normal operation but activates within picoseconds during overvoltage events. Use Value: Breakdown voltage window (20.0–22.1 V) ensures margin above 18 V operating rail while guaranteeing activation before damage thresholds of downstream MOSFETs or controllers. | Use Scenario: Secondary-level protection on telecom line interface cards handling T1/E1 or xDSL signals vulnerable to induced surges from nearby power lines. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) avalanche device placed before protection ICs or isolation transformers to absorb bulk surge energy. Use Value: Very low clamping voltage (≤32.4 V) preserves signal amplitude headroom and prevents saturation of upstream amplifiers or line drivers during surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | Same VWM (18 V), lower PPPM (400 W), SMA (DO-214AC) package, RθJA = 110 °C/W | Lower power handling and higher thermal resistance limit use to lower-energy transients or smaller PCB areas | Select SMAJ18CA only when surge energy is ≤400 W and board space constraints favor SMA over SMCG. |
| SMCJ18CA | Same VWM (18 V), higher PPPM (1500 W), SMC (DO-214AB) package, RθJA = 40 °C/W, larger footprint | Superior thermal performance enables higher duty-cycle surge immunity but requires ~2.5× more PCB area than SMCG | Choose SMCJ18CA where sustained surge repetition or elevated ambient temperatures demand lower thermal resistance. |
Compared with SMAJ18CA and SMCJ18CA, SMCG18CAHE3/9AT uniquely balances 1500 W surge capability, AEC-Q101 qualification, and compact DO-215AB packaging-making it optimal for space-constrained automotive and industrial modules requiring certified reliability without thermal derating penalties.
Availability
SMCG18CAHE3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial I/O protection, and telecom line card designs requiring stable component supply, AEC-Q101 compliance, and high-energy transient immunity.
Supply support for SMCG18CAHE3/9AT 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, precision, and automotive-grade qualification.
The SMCG series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power, low-profile surface-mount surge protection in harsh environments including automotive under-hood, industrial automation, and infrastructure equipment.
FAQ
What is the breakdown voltage range of SMCG18CAHE3/9AT?
The SMCG18CAHE3/9AT has a guaranteed breakdown voltage (VBR) range of 20.0 V to 22.1 V at a test current of 1 mA, measured per ANSI/IEEE C62.35. This tight tolerance ensures consistent clamping behavior across production units and supports precise system-level overvoltage margining in designs using SMCG18CAHE3/9AT.
Is SMCG18CAHE3/9AT suitable for automotive applications?
Yes, SMCG18CAHE3/9AT is AEC-Q101 qualified and manufactured with HE3 suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. Its 1500 W peak pulse power, 150 °C maximum junction temperature, and MSL Level 1 rating make SMCG18CAHE3/9AT appropriate for engine control, body electronics, and ADAS sensor protection per ISO 7637-2 and ISO 16750-2 requirements.
What does the "HE3/9AT" suffix indicate in SMCG18CAHE3/9AT?
The "HE3" suffix denotes RoHS-compliant, AEC-Q101-qualified construction with halogen-free molding compound; "9AT" specifies packaging in 13-inch diameter tape-and-reel format with 3500 units per reel. This configuration ensures traceable, automotive-grade supply chain readiness and compatibility with high-speed SMT placement equipment for SMCG18CAHE3/9AT.
How does SMCG18CAHE3/9AT differ from unidirectional versions like SMCG18A?
SMCG18CAHE3/9AT is bidirectional, providing symmetrical clamping for both positive and negative transients with identical VBR (20.0–22.1 V) and VC characteristics. In contrast, SMCG18A is unidirectional, featuring a cathode band marking and forward conduction capability. SMCG18CAHE3/9AT eliminates polarity concerns in AC-coupled or differential signal paths where voltage reversals occur.
What is the maximum clamping voltage of SMCG18CAHE3/9AT under surge conditions?
The SMCG18CAHE3/9AT clamps to a maximum of 32.4 V at its rated peak pulse current (IPPM = 46.3 A) under the standardized 10/1000 µs waveform. This value is measured with the device mounted on 8.0 mm × 8.0 mm copper pads per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during worst-case transient events involving SMCG18CAHE3/9AT.
SMCG18CAHE3/9AT 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCG)
SMCG18CAHE3/9AT FAQ
1.How can I place an order for SMCG18CAHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG18CAHE3/9AT 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 SMCG18CAHE3/9AT reliable?
The price and inventory of SMCG18CAHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG18CAHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG18CAHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG18CAHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG18CAHE3/9AT?
SMCG18CAHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG18CAHE3/9AT 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 SMCG18CAHE3/9AT?
For technical support, including SMCG18CAHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG18CAHE3/9AT requirements.
6.How does Aetrix verify that SMCG18CAHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG18CAHE3/9AT 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 SMCG18CAHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG18CAHE3/9AT?
All SMCG18CAHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG18CAHE3/9AT, 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 SMCG18CAHE3/9AT part is unused and in its original packaging.
Return procedure for SMCG18CAHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG18CAHE3/9AT Tags
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