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Vishay General Semiconductor - Diodes Division SMCG18A-M3/9AT
- Part No.:
- SMCG18A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG18A-M3/9AT.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,191
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Product details
Overview
SMCG18A-M3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, featuring 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 designed for automotive-grade overvoltage protection of power rails and signal lines.
For engineers reviewing the SMCG18A-M3/9AT datasheet, SMCG18A-M3/9AT pinout, SMCG18A-M3/9AT application, or SMCG18A-M3/9AT equivalent, key selection criteria include clamping performance under 10/1000 µs surge, unidirectional polarity with cathode band marking, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping-type protector, leveraging an avalanche junction to limit transient voltages before they damage downstream ICs or MOSFETs. Its low incremental surge resistance and fast response time (<1 ns) enable effective suppression of ESD, load dump, and inductive switching spikes.
The device is rated for -55 °C to +150 °C operating junction temperature, with thermal resistance RθJA = 75 °C/W and RθJL = 15 °C/W. It meets J-STD-020 MSL Level 1 and passes JESD201 Class 2 whisker testing, confirming suitability for high-reliability industrial and automotive PCB assemblies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin below breakdown. |
| VBR (min/max) | 20.0 V / 22.1 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | 29.2 V at 51.4 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected circuitry. |
| PPPM | 1500 W - Peak pulse power handling capability; supports robust protection against IEC 61000-4-5 Level 4 surges. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | SMCG (DO-215AB) - Surface-mount gull-wing package with matte tin-plated leads; optimized for automated placement and reflow. |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress test requirements including HTGB, HTRB, and TCT. |
Pinout & Package
SMCG18A-M3/9AT uses the SMCG (DO-215AB) surface-mount package: gull-wing leads, 0.220–0.245 inch body length, 0.115–0.125 inch width, 0.024–0.040 inch lead span, and cathode band marking on the anode-side terminal end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to ground or low-side reference in unidirectional configuration | Terminal where surge current enters during reverse transient; must be routed to lowest-impedance ground path. |
| Cathode | Current exit point in forward bias; marked with band; connected to protected line | Terminal tied to the line being protected (e.g., 12 V rail); clamps voltage to VC when transients exceed VWM. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use across temperature cycling, humidity, and high-temperature reverse bias stress. |
| Halogen-free & RoHS compliant (M3) | Meets environmental compliance mandates without compromising solderability or long-term reliability. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients, improving clamping precision under real-world surge conditions. |
| MSL Level 1 rating | Allows unlimited floor life and reflow at peak 260 °C without preconditioning-ideal for just-in-time manufacturing. |
| Glass passivated junction | Enhances stability and leakage control over temperature and lifetime versus epoxy-passivated alternatives. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump transients up to ±100 V and 200 A surge currents. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground, acting as primary clamping element ahead of DC/DC converters and microcontrollers. Use Value: Limits clamped voltage to ≤29.2 V, preventing latch-up or gate oxide rupture in downstream 3.3 V/5 V logic and power management ICs. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC modules exposed to relay coil flyback. IC Role / Device Role / Timing Role: Bidirectional-capable but used unidirectionally on supply-sensing lines; absorbs sub-µs inductive spikes before they corrupt ADC readings. Use Value: Sub-1 ns response and 29.2 V clamping preserve signal integrity and prevent false triggering in 12-bit+ measurement systems. |
| Telecom Line Card Surge Suppression | Consumer Power Adapter Input Stage |
Use Scenario: Front-end protection on PoE-powered line cards subject to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary TVS on 48 V DC input rail; coordinated with upstream GDT and downstream π-filter for multi-stage protection. Use Value: 1500 W PPPM rating and 51.4 A IPPM support coordination with secondary protectors while maintaining low let-through energy. | Use Scenario: Input-stage transient suppression in universal-input AC/DC adapters for smart home devices. IC Role / Device Role / Timing Role: Unidirectional clamp on bulk capacitor input, absorbing differential-mode surges from mains switching events. Use Value: 18 V VWM allows compatibility with 15–24 V intermediate bus designs; halogen-free M3 suffix satisfies regional eco-regulations. |
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), lower PPPM (400 W), SMA (DO-214AC) package, non-AEC-Q101 | Rated for commercial/industrial use only; unsuitable for automotive under-hood deployment | Select when cost sensitivity outweighs automotive qualification and higher surge immunity is not required. |
| SMCJ18A-M3/9AT | Same VWM (18 V), identical PPPM (1500 W), AEC-Q101 qualified, but larger SMC (DO-214AB) package | Requires more PCB area; higher thermal mass slows response slightly but improves sustained surge handling | Prefer when board space permits and enhanced thermal robustness under repeated surges is prioritized. |
Compared with SMCG18A-M3/9AT, SMAJ18A-E3/57T offers lower cost and smaller footprint but lacks automotive qualification and surge capacity, while SMCJ18A-M3/9AT delivers identical electrical protection with greater thermal inertia at the expense of 30% larger board area.
Availability
SMCG18A-M3/9AT is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom line card prototyping requiring stable component supply and full traceability.
Supply support for SMCG18A-M3/9AT 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, efficiency, and application-specific optimization.
The SMCG series was developed to deliver AEC-Q101-qualified, high-power TVS protection in a compact gull-wing package for space-constrained automotive and industrial power systems.
FAQ
What is the clamping voltage of SMCG18A-M3/9AT and how is it measured?
The SMCG18A-M3/9AT has a maximum clamping voltage (VC) of 29.2 V, measured at 51.4 A peak pulse current using a standardized 10/1000 µs double-exponential surge waveform. This value represents the highest voltage seen across the device during surge conduction and is critical for ensuring protected circuits remain within their absolute maximum ratings. The SMCG18A-M3/9AT achieves this clamping performance while maintaining low incremental resistance and fast response.
Is SMCG18A-M3/9AT suitable for automotive applications?
Yes, SMCG18A-M3/9AT is AEC-Q101 qualified and specifically designed for automotive use, including engine control units, body electronics, and ADAS sensor modules. Its operating junction temperature range of -55 °C to +150 °C, MSL Level 1 rating, and halogen-free RoHS-compliant (M3) construction meet stringent automotive reliability and environmental requirements. The SMCG18A-M3/9AT is validated for high-temperature reverse bias, temperature cycling, and humidity testing per AEC-Q101.
How does the M3 suffix affect SMCG18A-M3/9AT's compliance and assembly process?
The M3 suffix indicates halogen-free, RoHS-compliant construction with matte tin-plated leads that meet J-STD-002 and JESD22-B102 solderability standards. It also confirms compliance with JESD201 Class 2 whisker resistance. These attributes ensure reliable reflow soldering at peak temperatures up to 260 °C without preconditioning (MSL Level 1), making SMCG18A-M3/9AT compatible with standard high-volume SMT lines and environmentally regulated markets.
What is the difference between SMCG18A-M3/9AT and SMCG188A-M3/9AT?
SMCG18A-M3/9AT has a 18 V stand-off voltage (VWM) and 20.0–22.1 V breakdown range, while SMCG188A-M3/9AT is rated for 188 V VWM and 209–231 V VBR-designed for high-voltage industrial or telecom applications. Both share the same SMCG (DO-215AB) package, 1500 W PPPM, and AEC-Q101 qualification, but their voltage ratings are not interchangeable. Selecting SMCG18A-M3/9AT ensures optimal clamping headroom for 12–24 V systems, whereas SMCG188A-M3/9AT targets 100–200 V rails.
Can SMCG18A-M3/9AT be used in bidirectional configurations?
No-SMCG18A-M3/9AT is a unidirectional TVS diode, identified by its cathode band marking. Bidirectional operation requires the CA-suffixed variant (e.g., SMCG18CA-M3/9AT), which has symmetrical breakdown in both polarities. Using SMCG18A-M3/9AT in reverse-biased AC or floating signal paths will result in forward conduction and failure. Always verify polarity marking and match device type (A vs. CA) to circuit topology before layout.
SMCG18A-M3/9AT 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-M3/9AT FAQ
1.How can I place an order for SMCG18A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG18A-M3/9AT 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-M3/9AT reliable?
The price and inventory of SMCG18A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG18A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG18A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG18A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG18A-M3/9AT?
SMCG18A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG18A-M3/9AT 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-M3/9AT?
For technical support, including SMCG18A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG18A-M3/9AT requirements.
6.How does Aetrix verify that SMCG18A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG18A-M3/9AT 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-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG18A-M3/9AT?
All SMCG18A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG18A-M3/9AT, 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-M3/9AT part is unused and in its original packaging.
Return procedure for SMCG18A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG18A-M3/9AT Tags
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