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Vishay General Semiconductor - Diodes Division SMCG18A-E3/9AT
- Part No.:
- SMCG18A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG18A-E3/9AT.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,924
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Product details
Overview
SMCG18A-E3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, with a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 29.2 V clamping voltage (VC) at 51.4 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM). It is AEC-Q101 qualified and used for automotive-level ESD and surge protection on power rails and signal lines.
For engineers reviewing the SMCG18A-E3/9AT datasheet, SMCG18A-E3/9AT pinout, SMCG18A-E3/9AT application, or SMCG18A-E3/9AT equivalent, key selection criteria include clamping performance under 10/1000 µs transients, thermal resistance (RθJA = 75 °C/W), unidirectional polarity marking, and compliance with UL 497B and AEC-Q101 for automotive electronics.
Technical Context
This TVS diode operates as a shunt-clamping device, responding to overvoltage events by avalanche breakdown to limit transient energy before it reaches downstream ICs. Its glass-passivated junction ensures stable VBR tolerance and low leakage (ID ≤ 1.0 µA at VWM), while the DO-215AB package supports automated SMT placement and meets MSL level 1 reflow requirements.
The device is rated for non-repetitive 10/1000 µs surges up to 1500 W and handles 200 A forward surge (IFSM) in unidirectional mode. Thermal design relies on 8.0 mm × 8.0 mm copper pads per terminal to sustain power dissipation (PD = 6.5 W at TA = 50 °C) and maintain TJ ≤ 150 °C under sustained stress.
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 - breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 29.2 V at 51.4 A - clamped voltage during 10/1000 µs surge, limiting stress on protected circuitry |
| PPPM | 1500 W - peak transient power it can absorb without failure, critical for ISO 7637-2 pulse 5a/b immunity |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance on standard 8 mm × 8 mm pads, guiding heatsinking needs |
| TJ max | +150 °C - maximum allowable junction temperature, enabling operation in under-hood automotive environments |
| AEC-Q101 | Qualified - validated for automotive reliability including temperature cycling, HTRB, and ESD per AEC standard |
Pinout & Package
Package: SMCG (DO-215AB) - surface-mount, low-profile gull-wing leaded package with matte tin-plated terminals, UL 94 V-0 molding compound, and cathode band marking for unidirectional polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to protected line ground or low-side return | Completes conduction path during transient clamping; must be routed with low-inductance trace to minimize overshoot |
| Cathode | Current exit point in forward bias; marked with band, connected to supply rail or signal source | Defines polarity-sensitive placement; incorrect orientation prevents clamping and risks device failure |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures tight VBR tolerance (±5 %), stable leakage (<1 µA), and long-term reliability under thermal cycling |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules requiring zero-defect robustness |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision for sensitive 3.3 V/5 V logic |
| MSL Level 1 rating | Enables standard reflow without pre-baking, reducing manufacturing complexity and cost |
| UL 497B recognition | Confirms compliance for telecom and industrial data line protection applications requiring safety agency approval |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between VBAT and GND, triggered within <1 ns to clamp spikes to ≤29.2 V. Use Value: Prevents damage to MCU power inputs and CAN transceivers by limiting peak voltage below their absolute maximum ratings. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in PLC I/O modules exposed to field wiring surges. IC Role / Device Role / Timing Role: Unidirectional TVS on signal line to ground, absorbing induced lightning-induced transients on 24 V loop-powered sensors. Use Value: Maintains signal integrity by clamping transients before they distort ADC readings or trigger false fault detection. |
| Consumer USB Power Delivery Protection | Telecom Ethernet Port Surge Suppression |
Use Scenario: Guarding USB-C PD input stages in portable medical devices against ESD and hot-swap transients. IC Role / Device Role / Timing Role: Primary TVS on VBUS line, positioned upstream of buck converter, activated within nanoseconds of contact discharge. Use Value: Enables IEC 61000-4-2 ±15 kV air/±8 kV contact ESD compliance without derating downstream FETs or controllers. | Use Scenario: Front-end protection for PoE-powered Ethernet PHYs in network switches subjected to induced surges on RJ45 lines. IC Role / Device Role / Timing Role: Unidirectional TVS on each differential pair (MDI), referenced to chassis ground, handling 10/1000 µs common-mode surges. Use Value: Limits clamped voltage to 29.2 V, preserving PHY's 3.3 V I/O tolerance and avoiding latch-up or permanent damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A-E3/57T | Same VWM (18 V), but lower PPPM (400 W) and higher VC (32.4 V); SMA (DO-214AC) package, smaller footprint | Limited to lower-energy transients (e.g., IEC 61000-4-5 Level 3); unsuitable for ISO 7637-2 pulse 5b | Select when board space is constrained and surge energy is ≤400 W; verify clamping margin with downstream ICs. |
| SMCJ18A-E3/9AT | Same VWM (18 V), identical PPPM (1500 W), but larger SMC (DO-214AB) package and higher RθJA (50 °C/W) | Better thermal mass for repeated surges; requires larger pad layout and may not fit high-density automotive PCBs | Choose when thermal cycling endurance matters more than size; confirm mechanical clearance for gull-wing leads. |
Compared with SMAJ18A-E3/57T and SMCJ18A-E3/9AT, the SMCG18A-E3/9AT delivers identical 1500 W surge capability in a lower-profile, AEC-Q101-qualified DO-215AB package-ideal for space-constrained automotive modules needing certified reliability without thermal derating penalties.
Availability
SMCG18A-E3/9AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and consumer USB power delivery systems requiring stable component supply and long-term lifecycle support.
Supply support for SMCG18A-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 designs and manufactures discrete semiconductors including diodes, MOSFETs, and TVS devices, with emphasis on high-reliability, industry-qualified components.
The SMCG series targets automotive and industrial transient protection, engineered specifically for AEC-Q101 compliance, low clamping voltage, and robust surge handling in compact surface-mount packages.
FAQ
What is the clamping voltage of the SMCG18A-E3/9AT under a 10/1000 µs surge?
The SMCG18A-E3/9AT has a maximum clamping voltage (VC) of 29.2 V at 51.4 A peak pulse current (IPPM) for a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMCG18A-E3/9AT maintains this clamping performance across its full operating temperature range.
Is the SMCG18A-E3/9AT suitable for automotive applications?
Yes, the SMCG18A-E3/9AT is AEC-Q101 qualified and explicitly designed for automotive use, including engine control units, body electronics, and ADAS modules. Its construction-glass-passivated junction, MSL Level 1 rating, and UL 497B recognition-meets stringent automotive reliability and safety requirements. The SMCG18A-E3/9AT is commonly deployed in 12 V and 24 V power rail protection per ISO 7637-2.
What does the "E3/9AT" suffix indicate in SMCG18A-E3/9AT?
The "E3" denotes RoHS-compliant, industrial-grade construction with matte tin-plated leads meeting J-STD-002 solderability and JESD 201 Class 2 whisker resistance. The "9AT" specifies packaging in a 13-inch diameter plastic tape and reel containing 3500 units-optimized for high-volume SMT assembly. This suffix distinguishes it from smaller reels (e.g., "57T") and halogen-free variants (e.g., "M3").
How does the SMCG18A-E3/9AT differ from bidirectional TVS diodes like SMCG18CA?
The SMCG18A-E3/9AT is unidirectional and features a cathode band for polarity-sensitive placement, while SMCG18CA is bidirectional with no polarity marking and symmetrical clamping in both directions. The SMCG18A-E3/9AT offers lower leakage (<1 µA at 18 V) and is preferred for DC power rail protection; SMCG18CA suits AC-coupled or floating signal lines where polarity reversal may occur.
What PCB layout guidance applies to the SMCG18A-E3/9AT for optimal surge performance?
For best transient response, route the SMCG18A-E3/9AT with minimal trace length between anode and ground plane, using 8.0 mm × 8.0 mm copper pads per terminal as specified. Avoid vias in the current path and ensure solid thermal connection to inner-layer planes. The SMCG18A-E3/9AT's low-inductance DO-215AB gull-wing leads require precise stencil aperture design to prevent solder bridging during reflow.
SMCG18A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMCG18A-E3/9AT FAQ
1.How can I place an order for SMCG18A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG18A-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 SMCG18A-E3/9AT reliable?
The price and inventory of SMCG18A-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 SMCG18A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG18A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG18A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG18A-E3/9AT?
SMCG18A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG18A-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 SMCG18A-E3/9AT?
For technical support, including SMCG18A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG18A-E3/9AT requirements.
6.How does Aetrix verify that SMCG18A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG18A-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 SMCG18A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG18A-E3/9AT?
All SMCG18A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG18A-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 SMCG18A-E3/9AT part is unused and in its original packaging.
Return procedure for SMCG18A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG18A-E3/9AT Tags
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