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Vishay General Semiconductor - Diodes Division SMCG18CA-M3/57T
- Part No.:
- SMCG18CA-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG18CA-M3/57T.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,015
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Product details
Overview
SMCG18CA-M3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for high-energy surge protection with 1500 W peak pulse power (10/1000 µs), 18 V stand-off voltage (VWM), and clamping voltage of 29.2 V at rated surge current. It is AEC-Q101 qualified and used to protect automotive sensor signal lines, power rails, and I/O interfaces against ESD and load dump transients.
For engineers reviewing the SMCG18CA-M3/57T datasheet, SMCG18CA-M3/57T pinout, SMCG18CA-M3/57T application, or SMCG18CA-M3/57T equivalent, key selection criteria include bidirectional clamping behavior, 18 V working voltage, 29.2 V max clamping at IPPM, AEC-Q101 qualification, and DO-215AB surface-mount compatibility with automated placement.
Technical Context
This device operates as a voltage-clamped crowbar during transient overvoltage events, leveraging an avalanche breakdown mechanism across both polarities. Its bidirectional symmetry ensures identical VBR min/max (20.0 V / 22.1 V at 1 mA) and clamping performance regardless of surge polarity.
Thermal design relies on low RθJL (15 °C/W) and moderate RθJA (75 °C/W), requiring PCB copper pad areas of 8.0 mm × 8.0 mm per terminal for full 1500 W rating. It meets J-STD-020 MSL Level 1 and supports peak surge currents up to 51.4 A (10/1000 µs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - guaranteed breakdown threshold range defining turn-on consistency |
| VC @ IPPM | 29.2 V at 51.4 A - maximum clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 1500 W - peak pulse power handling under standardized 10/1000 µs waveform |
| ID @ VWM | 1.0 µA - ultra-low leakage ensuring minimal standby power loss and signal integrity |
| TJ max. | +150 °C - junction temperature limit enabling operation in under-hood automotive 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 case with matte tin-plated terminals, compliant with J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance. No polarity marking on bidirectional variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive polarity surge) | One terminal of symmetrical avalanche junction; accepts surge current in either direction |
| Cathode | Transient current entry (negative polarity surge) | Second terminal of symmetrical junction; functionally identical to Anode in bidirectional mode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal paths without polarity concerns |
| 1500 W peak pulse rating | Supports robust immunity to ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surges |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules |
| Halogen-free & RoHS compliant (M3 suffix) | Meets environmental compliance requirements for global automotive OEMs and Tier 1 suppliers |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns response time) |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine control units exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed directly at connector interface to shunt transients before reaching precision ADC front-end. Use Value: Limits clamped voltage to 29.2 V, preventing damage to 3.3 V or 5 V sensor signal conditioning ICs while maintaining <1.0 µA leakage at 18 V nominal rail. | Use Scenario: Safeguarding differential CAN_H/CAN_L lines in industrial gateways subject to EFT and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamping device mounted across bus pair to clamp common-mode transients without disrupting DC bias or signal integrity. Use Value: Symmetrical 20.0–22.1 V breakdown enables equal protection on both lines; 1500 W rating handles repetitive 4 kV EFT bursts per IEC 61000-4-4. |
| Consumer Power Adapter Input | Telecom DSL Line Interface |
Use Scenario: Input-stage surge suppression on 12 V/24 V wall adapters for smart home hubs, guarding against AC line transients coupled through transformer leakage. IC Role / Device Role / Timing Role: Primary-level TVS connected between input rail and ground, activated within nanoseconds of overvoltage onset. Use Value: 29.2 V clamping prevents overstress of downstream rectifier and primary-side controller; DO-215AB footprint allows compact layout adjacent to input connector. | Use Scenario: Protection of ADSL/VDSL line drivers and receivers against induced surges on twisted-pair telecom lines. IC Role / Device Role / Timing Role: Bidirectional TVS placed across tip/ring (or differential pair) to clamp longitudinal surges while preserving low-capacitance signal path. Use Value: 1.0 µA leakage at 18 V ensures no impact on line impedance matching; 1500 W rating exceeds GR-1089-CORE Level 3 surge requirements. |
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), lower PPPM (400 W), SMA (DO-214AC) package | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a (load dump) | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2/4-4 only |
| SMCJ18CA | Same VWM (18 V), higher PPPM (1500 W), SMC (DO-214AB) package | Same energy rating but larger footprint; higher thermal mass improves sustained surge handling | Prefer when thermal margin is critical and PCB real estate permits larger SMC outline |
Compared with SMAJ18CA and SMCJ18CA, the SMCG18CA-M3/57T delivers identical 18 V clamping performance and 1500 W surge capability in a lower-profile DO-215AB package optimized for automated assembly and space-constrained automotive modules, while retaining AEC-Q101 qualification.
Availability
SMCG18CA-M3/57T is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus interfaces, and telecom line protection requiring stable component supply and AEC-Q101-compliant surge immunity.
Supply support for SMCG18CA-M3/57T 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
The SMCG series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power, bidirectional transient suppression in harsh automotive and industrial environments where AEC-Q101 compliance and precise clamping accuracy are mandatory.
FAQ
What is the clamping voltage of SMCG18CA-M3/57T under a 10/1000 µs surge?
The SMCG18CA-M3/57T has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current of 51.4 A using the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable voltage limiting during surge events, protecting downstream 24 V-rated circuitry.
Is SMCG18CA-M3/57T suitable for automotive applications?
Yes, SMCG18CA-M3/57T is AEC-Q101 qualified and explicitly designed for automotive use. Its 1500 W surge rating, 150 °C max junction temperature, halogen-free M3 construction, and DO-215AB package meet stringent requirements for engine control, body electronics, and ADAS subsystems per ISO 7637-2 and ISO 16750-2.
Does SMCG18CA-M3/57T have polarity markings?
No, SMCG18CA-M3/57T does not feature polarity markings because it is a bidirectional TVS diode. The device functions identically regardless of orientation across the protected line, eliminating installation errors and simplifying layout for differential or floating signals - unlike unidirectional variants which use a cathode band.
What is the leakage current specification for SMCG18CA-M3/57T at its stand-off voltage?
At its 18 V stand-off voltage (VWM), the SMCG18CA-M3/57T exhibits a maximum reverse leakage current (ID) of 1.0 µA at 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor circuits and minimizes power loss in always-on automotive modules.
What package type does SMCG18CA-M3/57T use, and what are its mounting requirements?
SMCG18CA-M3/57T uses the SMCG (DO-215AB) surface-mount package with gull-wing leads. For full 1500 W rating, it must be mounted on 8.0 mm × 8.0 mm copper pads per terminal per Vishay's recommended layout; it complies with J-STD-020 MSL Level 1 and supports reflow peak temperatures up to 260 °C.
SMCG18CA-M3/57T 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):
- 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-M3/57T FAQ
1.How can I place an order for SMCG18CA-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG18CA-M3/57T 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 SMCG18CA-M3/57T reliable?
The price and inventory of SMCG18CA-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCG18CA-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCG18CA-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG18CA-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG18CA-M3/57T?
SMCG18CA-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG18CA-M3/57T 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 SMCG18CA-M3/57T?
For technical support, including SMCG18CA-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG18CA-M3/57T requirements.
6.How does Aetrix verify that SMCG18CA-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCG18CA-M3/57T 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 SMCG18CA-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCG18CA-M3/57T?
All SMCG18CA-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCG18CA-M3/57T, 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 SMCG18CA-M3/57T part is unused and in its original packaging.
Return procedure for SMCG18CA-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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