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Vishay General Semiconductor - Diodes Division SMCG18A-M3/57T
- Part No.:
- SMCG18A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG18A-M3/57T.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,944
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Product details
Overview
SMCG18A-M3/57T from Vishay General Semiconductor is a halogen-free, RoHS-compliant, AEC-Q101-qualified bidirectional transient voltage suppressor (TVS) in the SMCG (DO-215AB) package. 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), 51.4 A peak pulse current (IPPM), and clamps to 29.2 V at IPPM - designed for robust overvoltage protection on automotive sensor signal lines and power rails.
For engineers reviewing the SMCG18A-M3/57T datasheet, SMCG18A-M3/57T pinout, SMCG18A-M3/57T application, or SMCG18A-M3/57T equivalent, this device is selected for high-reliability transient suppression where AEC-Q101 qualification, low clamping voltage, and MSL Level 1 solderability are mandatory - especially in 12 V automotive subsystems with inductive switching noise.
Technical Context
The SMCG18A-M3/57T operates as a bidirectional avalanche diode, delivering symmetrical clamping in both polarities without polarity marking. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling consistent response to 10/1000 µs transients up to 1500 W.
Thermally, it exhibits RθJA = 75 °C/W and RθJL = 15 °C/W, supporting operation from –55 °C to +150 °C junction temperature. The DO-215AB package provides mechanical robustness and meets UL 94 V-0 flammability, with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 12 V automotive systems. |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - Tight breakdown window ensures predictable turn-on and minimal variation across production lots. |
| VC at IPPM | 29.2 V - Clamping voltage under 51.4 A 10/1000 µs surge; limits downstream IC stress during load dump or ISO 7637-2 pulses. |
| PPPM | 1500 W - Peak pulse power handling capability per single transient event; validated on 8.0 mm × 8.0 mm copper pads. |
| ID at VWM | 1.0 µA - Ultra-low leakage at stand-off voltage preserves signal integrity and minimizes standby power loss. |
| TJ max. | +150 °C - Enables deployment in under-hood automotive environments without derating in most PCB layouts. |
| MSL Level | Level 1 (260 °C peak) - Supports standard lead-free reflow without moisture sensitivity concerns or baking requirements. |
Pinout & Package
Package: SMCG (DO-215AB) - surface-mount, gull-wing, bidirectional configuration with no polarity marking. Dimensions: 7.87 mm × 3.17 mm × 2.41 mm (L × W × H); cathode/anode terminals are symmetric and interchangeable for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (bidirectional) | Interchangeable terminal; forms symmetrical avalanche junction - no polarity dependency in circuit layout. |
| Terminal 2 | Anode / Cathode (bidirectional) | Interchangeable terminal; enables placement flexibility and eliminates orientation constraints on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - required for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS compliant (M3 suffix) | Meets IEC 61249-2-21 and JEDEC J-STD-203 for green manufacturing; supports sustainability compliance without performance trade-offs. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during fast transients - critical for protecting 3.3 V or 5 V logic interfaces downstream of protected lines. |
| Very fast response time (< 1 ps) | Clamps within picoseconds of transient onset - faster than MOVs or polymer-based protectors - preserving signal fidelity on high-speed sensor lines. |
| MSL Level 1 rating | Enables direct placement into high-volume SMT lines without dry-packaging or pre-bake steps - reduces assembly cost and process complexity. |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, or position sensors exposed to load-dump and jump-start transients in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector entry point to shunt ESD and surge energy before reaching precision amplifier or ADC input. Use Value: Clamps 51.4 A surges to ≤29.2 V while maintaining sub-µA leakage - preventing sensor offset drift and ensuring measurement accuracy over lifetime. |
Use Scenario: Safeguarding CANH/CANL differential pair against ISO 11898-2 fast transients and ESD events in factory automation controllers. IC Role / Device Role / Timing Role: Paired SMCG18A-M3/57T devices (one per line) provide symmetrical rail-to-rail clamping without affecting differential signaling integrity. Use Value: 29.2 V clamping voltage stays well below CAN transceiver absolute maximum ratings (typically ±40 V), avoiding latch-up or permanent damage. |
| Power Supply Input Protection | Motor Drive Gate Driver Protection |
Use Scenario: Front-end protection for DC-DC converters and LDO regulators powering infotainment head units subjected to battery reversal and alternator ripple. IC Role / Device Role / Timing Role: Placed between fuse and input capacitor to absorb repetitive 10/1000 µs pulses up to 1500 W without degradation. Use Value: 1500 W PPPM rating and 75 °C/W thermal resistance allow sustained operation without thermal runaway in compact enclosures. |
Use Scenario: Shielding high-side/low-side gate drivers in BLDC motor inverters from Miller-induced voltage spikes during MOSFET switching. IC Role / Device Role / Timing Role: Mounted across driver supply rails (VDD–GND) to clamp ringing above 18 V before exceeding driver IC's absolute max rating. Use Value: 20–22.1 V VBR ensures early conduction before gate oxide stress occurs, extending driver IC lifetime in harsh EMI environments. |
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) and PPPM (400 W), but lower power rating and SMA (DO-214AC) package - smaller footprint, higher RθJA (110 °C/W). | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a (load dump) due to 400 W limit. | Select when board space is constrained and surge energy is ≤400 W - not a drop-in replacement for SMCG18A-M3/57T in automotive power rails. |
| SMCJ18A-M3/57T | Same VWM (18 V) and DO-214AB package, but rated for 1500 W with 20.0–22.2 V VBR - identical electrical specs but non-AEC-Q101 qualified and M3 suffix only indicates halogen-free, not automotive grade. | Lacks AEC-Q101 validation; not approved for safety-critical automotive modules requiring qualification evidence. | Use in industrial or consumer applications where AEC-Q101 is not mandated - same clamping performance but different compliance scope. |
Compared with SMAJ18A-E3/57T and SMCJ18A-M3/57T, the SMCG18A-M3/57T uniquely combines 1500 W surge capability, AEC-Q101 qualification, and MSL Level 1 - making it the only option among the three qualified for under-hood automotive deployment with full load-dump immunity.
Availability
SMCG18A-M3/57T is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus interface, and power supply input protection requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for Tier 1 OEM programs.
Supply support for SMCG18A-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 high-reliability diodes, rectifiers, and protection devices for automotive, industrial, and computing markets.
The SMCG series was engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - emphasizing low clamping, thermal stability, and process-controlled avalanche uniformity.
FAQ
What is the polarity configuration of SMCG18A-M3/57T?
The SMCG18A-M3/57T is a bidirectional TVS diode with symmetrical anode/cathode terminals and no polarity marking. Its breakdown and clamping behavior are identical in both directions, making it ideal for AC-coupled or differential signal lines where voltage transients may occur with either polarity - unlike unidirectional variants such as SMCG18A.
Does SMCG18A-M3/57T meet automotive qualification standards?
Yes, SMCG18A-M3/57T is AEC-Q101 qualified - verified for temperature cycling, highly accelerated stress testing (HAST), and mechanical shock per the AEC-Q101 standard. This qualification confirms its suitability for automotive powertrain, chassis, and body electronics applications where reliability under thermal and vibration stress is mandatory.
What is the maximum clamping voltage of SMCG18A-M3/57T under surge conditions?
The SMCG18A-M3/57T clamps to 29.2 V at its rated peak pulse current of 51.4 A (10/1000 µs waveform). This value is measured per ANSI/IEEE C62.35 and reflects worst-case clamping performance under standardized surge conditions - critical for verifying compatibility with downstream IC absolute maximum ratings.
How does the M3 suffix affect the environmental compliance of SMCG18A-M3/57T?
The M3 suffix on SMCG18A-M3/57T denotes halogen-free, RoHS-compliant construction meeting IEC 61249-2-21 and JEDEC J-STD-203. It also confirms compliance with JESD 201 Class 2 whisker resistance and UL 94 V-0 flammability - distinguishing it from E3-suffix parts which are RoHS-compliant but not halogen-free.
Can SMCG18A-M3/57T be used in place of SMCG18AHE3/57T?
No - SMCG18A-M3/57T and SMCG18AHE3/57T are not interchangeable. While both are AEC-Q101 qualified and halogen-free, the HE3 suffix indicates additional high-reliability screening beyond AEC-Q101. SMCG18A-M3/57T meets standard AEC-Q101 but lacks the extended test coverage of HE3, so substitution requires revalidation for mission-critical applications.
SMCG18A-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:
- 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-M3/57T FAQ
1.How can I place an order for SMCG18A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG18A-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 SMCG18A-M3/57T reliable?
The price and inventory of SMCG18A-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 SMCG18A-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCG18A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG18A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG18A-M3/57T?
SMCG18A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG18A-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 SMCG18A-M3/57T?
For technical support, including SMCG18A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG18A-M3/57T requirements.
6.How does Aetrix verify that SMCG18A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCG18A-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 SMCG18A-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCG18A-M3/57T?
All SMCG18A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCG18A-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 SMCG18A-M3/57T part is unused and in its original packaging.
Return procedure for SMCG18A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG18A-M3/57T Tags
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