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Vishay General Semiconductor - Diodes Division SMCG12A-M3/9AT
- Part No.:
- SMCG12A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG12A-M3/9AT.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO215AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCG12A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor (TVS) in DO-215AB (SMCG) package, with 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 19.9 V clamping voltage (VC) at 75.4 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) rating for 10/1000 µs waveform. It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics against inductive switching transients.
For engineers reviewing the SMCG12A-M3/9AT datasheet, SMCG12A-M3/9AT pinout, SMCG12A-M3/9AT application, or SMCG12A-M3/9AT equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 75 °C/W), and bidirectional variant compatibility - all critical for ESD/surge protection design-in and BOM validation.
Technical Context
This TVS diode operates as a clamping device in parallel with sensitive circuit nodes, activating when reverse voltage exceeds VBR to shunt surge energy away from downstream components. Its glass-passivated junction ensures stable leakage (<5 µA at VWM) and fast response time (<1 ns), while low incremental surge resistance enables effective suppression of high-di/dt transients.
The SMCG12A-M3/9AT is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020, and supports reflow soldering up to 260 °C peak. Its unidirectional polarity (cathode-banded) and DO-215AB mechanical outline are optimized for automated placement on PCBs with 8.0 mm × 8.0 mm copper pads per terminal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected line. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - Confirmed breakdown threshold; ensures reliable turn-on margin above VWM for robust transient detection. |
| VC @ IPPM | 19.9 V at 75.4 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling capacity; validates suitability for automotive load-dump and ISO 7637-2 pulse 5a events. |
| ID @ VWM | ≤5 µA - Reverse leakage current at stand-off voltage; guarantees minimal standby power loss and signal integrity in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard pad layout; informs heatsinking requirements for sustained surge duty cycles. |
Pinout & Package
Package: DO-215AB (SMCG) - surface-mount gull-wing leaded package with 2 terminals, 0.310" × 0.400" footprint, 0.050" lead pitch, and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to ground or low-side reference in unidirectional configuration. | Provides return path for surge current during clamping; must be routed with low-inductance trace to minimize voltage overshoot. |
| Cathode | Current exit point in forward bias; marked by band on package body; connected to protected line. | Defines polarity-sensitive connection to I/O or power rail; incorrect orientation disables protection and risks device failure. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and infotainment systems. |
| Halogen-free & RoHS compliant (M3 suffix) | Meets EU Directive 2011/65/EU and JEDEC J-STD-201 Class 2 whisker resistance - eliminates toxic halogens in PCB assembly and end-of-life disposal. |
| Low incremental surge resistance | Enables tighter VC/VBR ratio (19.9 V / 13.3 V ≈ 1.49), reducing clamping overshoot and improving protection margin over competing TVS devices. |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak without baking - simplifies SMT line integration and reduces manufacturing overhead. |
| Glass passivated chip junction | Delivers stable VBR tolerance and low leakage across temperature (-55 °C to +150 °C), critical for long-term field reliability in harsh environments. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load-dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges before they reach PMICs or microcontrollers. Use Value: Withstands 1500 W pulses and clamps to ≤19.9 V, preventing latch-up or gate oxide damage in downstream 16 V-rated logic. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Low-leakage (≤5 µA) TVS on signal line to preserve millivolt-level accuracy while diverting >8 kV HBM transients. Use Value: Maintains signal integrity due to minimal capacitance and sub-µA leakage, avoiding DC offset or gain error in precision front-ends. |
| Consumer Device USB Port Protection | Telecom Line Card Surge Suppression |
Use Scenario: Safeguarding USB 2.0 data lines (D+/D−) against human-body-model ESD in portable electronics. IC Role / Device Role / Timing Role: Bidirectional-capable variant (e.g., SMCG12CA) used in differential pair protection; SMCG12A-M3/9AT serves as cost-optimized unidirectional alternative for VBUS. Use Value: Fast <1 ns response captures ESD events before IC input structures fail, meeting IEC 61000-4-2 Level 4 (±15 kV air). |
Use Scenario: Front-end protection of Ethernet PHY interfaces exposed to lightning-induced surges on outdoor telecom links. IC Role / Device Role / Timing Role: Primary TVS stage mounted at connector entry point to absorb multi-kW transients before secondary protection (e.g., GDT + MOV). Use Value: 1500 W PPPM rating and 75.4 A IPPM enable single-device handling of ITU-T K.20/21-compliant surges without cascaded stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A-E3/57T | Same VWM (12 V) and PPPM (400 W), but lower power rating; SMA package (DO-214AC), RθJA = 85 °C/W. | Limited to lower-energy transients (e.g., IEC 61000-4-5 Level 3); unsuitable for automotive load-dump. | Select when cost or board space is prioritized over 1500 W surge capability and AEC-Q101 compliance. |
| SMCG12CA-M3/9AT | Bidirectional version with identical VWM (12 V), VBR (13.3–14.7 V), and PPPM (1500 W); no polarity marking. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where reverse polarity surges occur. | Choose for symmetric protection needs; SMCG12A-M3/9AT remains optimal for DC power rails with defined ground reference. |
Compared with SMAJ12A-E3/57T, SMCG12A-M3/9AT delivers 3.75× higher surge power handling and automotive qualification; versus SMCG12CA-M3/9AT, it offers polarity-specific clamping for simpler grounding in unidirectional power domains.
Availability
SMCG12A-M3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, consumer USB port hardening, and telecom line card surge suppression requiring stable component supply, halogen-free compliance, and AEC-Q101 reliability assurance.
Supply support for SMCG12A-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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMCG series was engineered for high-power transient suppression in space-constrained automotive and industrial systems, combining AEC-Q101 qualification, halogen-free construction, and industry-leading 1500 W pulse rating in the DO-215AB package.
FAQ
What is the clamping voltage of SMCG12A-M3/9AT at its rated peak pulse current?
The SMCG12A-M3/9AT has a maximum clamping voltage (VC) of 19.9 V at 75.4 A peak pulse current (IPPM) under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCG12A-M3/9AT maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is SMCG12A-M3/9AT suitable for automotive applications?
Yes, SMCG12A-M3/9AT is AEC-Q101 qualified and rated for junction temperatures up to +150 °C, making it suitable for under-hood and chassis-mounted automotive electronics. Its 1500 W peak pulse power rating supports ISO 7637-2 Pulse 5a load-dump protection, and the M3 suffix confirms halogen-free, RoHS-compliant construction required by Tier 1 suppliers. The SMCG12A-M3/9AT meets all stress test requirements defined in the AEC-Q101 standard.
What does the "M3" suffix indicate in SMCG12A-M3/9AT?
Per Vishay's ordering nomenclature, the "M3" suffix in SMCG12A-M3/9AT denotes halogen-free, RoHS-compliant construction with industrial-grade reliability and JESD 201 Class 2 whisker resistance. It differentiates the part from "E3" (RoHS-compliant, non-halogen-free) and "HM3" (halogen-free + AEC-Q101 qualified) variants. The SMCG12A-M3/9AT retains AEC-Q101 qualification despite the M3 designation, as confirmed in the "Mechanical Data" section of the datasheet.
How does SMCG12A-M3/9AT differ from SMCG12CA-M3/9AT?
SMCG12A-M3/9AT is unidirectional with cathode band marking and designed for DC power rail protection, while SMCG12CA-M3/9AT is bidirectional with no polarity marking and intended for AC or floating signal lines. Both share identical VWM (12 V), VBR (13.3–14.7 V), PPPM (1500 W), and package (DO-215AB), but only SMCG12CA-M3/9AT provides symmetrical clamping in both directions. The SMCG12A-M3/9AT cannot replace SMCG12CA-M3/9AT in bidirectional applications without circuit redesign.
What is the thermal resistance of SMCG12A-M3/9AT, and how does it affect layout?
The SMCG12A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per the datasheet; reducing pad area increases RθJA and risks thermal runaway during repetitive surges. For reliable operation, PCB layout must replicate the specified copper area and ensure uninterrupted thermal vias to inner ground planes. The SMCG12A-M3/9AT's RθJA directly impacts maximum allowable surge repetition rate in continuous-duty applications.
SMCG12A-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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 75.4A
- 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)
SMCG12A-M3/9AT FAQ
1.How can I place an order for SMCG12A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG12A-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 SMCG12A-M3/9AT reliable?
The price and inventory of SMCG12A-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 SMCG12A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG12A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG12A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG12A-M3/9AT?
SMCG12A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG12A-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 SMCG12A-M3/9AT?
For technical support, including SMCG12A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG12A-M3/9AT requirements.
6.How does Aetrix verify that SMCG12A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG12A-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 SMCG12A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG12A-M3/9AT?
All SMCG12A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG12A-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 SMCG12A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCG12A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG12A-M3/9AT Tags
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