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Vishay General Semiconductor - Diodes Division SMCG120CA-E3/9AT
- Part No.:
- SMCG120CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG120CA-E3/9AT.pdf
- Description:
- TVS DIODE 120VWM 193VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,820
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Product details
Overview
SMCG120CA-E3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in the SMCG (DO-215AB) package, designed for high-energy surge protection on signal and power lines. It features a 120 V standoff voltage (VWM), 1500 W peak pulse power (PPPM), clamping voltage of 193 V at 7.8 A IPPM, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMCG120CA-E3/9AT datasheet, SMCG120CA-E3/9AT pinout, SMCG120CA-E3/9AT application, or SMCG120CA-E3/9AT equivalent, this device is selected for robust ESD and lightning surge protection in automotive sensor interfaces, industrial I/O modules, and telecom line cards where bidirectional clamping and low clamping ratio are critical.
Technical Context
The SMCG120CA-E3/9AT operates as a bidirectional avalanche diode with symmetrical breakdown characteristics in both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable VBR (133–147 V) and low incremental surge resistance, supporting fast response to transients under 1 ns.
Thermally, it delivers 6.5 W power dissipation at TA = 50 °C with RθJA = 75 °C/W and RθJL = 15 °C/W, and is rated for TJ = –55 °C to +150 °C operation. The DO-215AB package supports automated placement and meets UL 94 V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 133 V / 147 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 193 V - Clamped voltage at 7.8 A peak pulse current (10/1000 µs waveform), limiting downstream stress |
| PPPM | 1500 W - Peak surge energy handling capability under standardized transient waveform |
| ID @ VWM | 1.0 µA - Reverse leakage at rated standoff voltage, ensuring minimal standby power loss |
| TJ max | +150 °C - Maximum junction temperature, 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-002 and JESD 22-B102 solderability standards. Bidirectional devices have no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive half-cycle) | One terminal of symmetrical avalanche junction; conducts during positive overvoltage events |
| Cathode | Transient current entry (negative half-cycle) | Second terminal of symmetrical junction; conducts during negative overvoltage events; no band marking |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC, differential, or floating lines without external polarity management |
| 1500 W PPPM rating | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 50 Ω source impedance lines |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, ADAS sensors, and body electronics |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes voltage overshoot across protected ICs, reducing risk of latch-up or gate oxide damage |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN FD and LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and ground, clamping transients before they reach the transceiver's ESD structure. Use Value: Maintains signal integrity during 12 V/24 V system surges while meeting AEC-Q101 requirements for automotive longevity. | Use Scenario: Shielding digital input/output channels on programmable logic controllers against induced surges from relay switching and motor drives. IC Role / Device Role / Timing Role: Primary front-end surge limiter on field-side I/O traces, absorbing up to 1500 W of transient energy per event. Use Value: Extends mean time between failures (MTBF) by preventing cumulative degradation of optocouplers and level-shifting buffers. |
| Telecom Line Interface | Consumer Power Adapter ESD Guard |
Use Scenario: Safeguarding Ethernet PHY magnetics and DSL line drivers against lightning-induced common-mode surges on outdoor-facing ports. IC Role / Device Role / Timing Role: Bidirectional clamp across differential pair (e.g., TX+/TX−), referenced to chassis ground via low-inductance layout. Use Value: Achieves <1 ns response with <193 V clamping, preserving signal eye diagram integrity during 10/1000 µs transients. | Use Scenario: Secondary-level ESD protection on DC output rails of USB-C PD adapters and wireless charging base stations. IC Role / Device Role / Timing Role: Final-stage TVS after primary MOV/fuse, suppressing fast ESD events (IEC 61000-4-2 ±8 kV contact) before reaching load ICs. Use Value: Low leakage (<1 µA) avoids quiescent current drain; RoHS-compliant E3 suffix ensures compliance with global environmental 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 |
|---|---|---|---|
| SMAJ120CA | Same VWM (120 V) and bidirectional configuration, but lower PPPM (400 W) and larger SMA (DO-214AC) package | Lower surge capacity limits use to sub-IEC 61000-4-5 Level 2 environments; less suitable for automotive load dump | Select SMAJ120CA only when board space allows larger footprint and surge requirements are ≤400 W |
| SMCJ120CA | Same VWM and bidirectional function, higher PPPM (1500 W), but uses larger SMC (DO-214AB) package with different thermal profile | Higher RθJA (50 °C/W vs. 75 °C/W) enables better heat dissipation but requires larger pad area and impacts layout density | Choose SMCJ120CA when thermal margin is constrained and PCB real estate permits larger 7.11 mm × 6.22 mm outline |
Compared with SMAJ120CA and SMCJ120CA, the SMCG120CA-E3/9AT delivers identical 120 V bidirectional clamping and 1500 W surge rating in the smallest DO-215AB footprint, offering optimal density for space-constrained automotive and telecom modules while maintaining AEC-Q101 compliance.
Availability
SMCG120CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and telecom line card designs requiring stable component supply, AEC-Q101 validation, and high-density surface-mount packaging.
Supply support for SMCG120CA-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 is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The SMCG series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power, bidirectional surge suppression in harsh environments including automotive, industrial automation, and communications infrastructure.
FAQ
What is the clamping voltage of the SMCG120CA-E3/9AT at its rated peak pulse current?
The SMCG120CA-E3/9AT has a maximum clamping voltage (VC) of 193 V at its specified peak pulse current (IPPM) of 7.8 A under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable voltage limiting during surge events, directly protecting downstream ICs rated for ≤200 V absolute maximum ratings. The clamping behavior is symmetrical due to its bidirectional construction.
Is the SMCG120CA-E3/9AT suitable for automotive applications?
Yes, the SMCG120CA-E3/9AT is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes glass-passivated junctions, MSL Level 1 moisture sensitivity, and operation from –55 °C to +150 °C, making it appropriate for under-hood and cabin-mounted ECUs, ADAS camera modules, and infotainment interfaces. The E3 suffix confirms RoHS compliance and industrial-grade reliability required by Tier 1 suppliers.
How does the SMCG120CA-E3/9AT differ from unidirectional variants like SMCG120A?
The SMCG120CA-E3/9AT is bidirectional, meaning it clamps voltage transients of either polarity symmetrically across its terminals, with no cathode marking. In contrast, SMCG120A is unidirectional and features a cathode band; it conducts only during reverse-biased overvoltage. The CA version supports AC-coupled or floating signal lines (e.g., CAN, RS-485), whereas the 'A' variant is used on DC-biased lines like power rails or single-ended sensors.
What is the thermal resistance of the SMCG120CA-E3/9AT, and how does it affect PCB layout?
The SMCG120CA-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain safe junction temperatures under repeated surges, designers must implement minimum recommended pad areas and avoid excessive trace length between the device and ground plane. Thermal derating above TA = 25 °C follows Fig. 2 in the datasheet.
Does the SMCG120CA-E3/9AT require polarity-aware PCB placement?
No - the SMCG120CA-E3/9AT is a bidirectional TVS diode with no polarity marking on the DO-215AB package. Both terminals are functionally identical, allowing orientation-agnostic placement on PCBs. This simplifies automated assembly and eliminates risk of reverse installation, unlike unidirectional versions such as SMCG120A, which require strict cathode alignment per silkscreen marking.
SMCG120CA-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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- 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)
SMCG120CA-E3/9AT FAQ
1.How can I place an order for SMCG120CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG120CA-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 SMCG120CA-E3/9AT reliable?
The price and inventory of SMCG120CA-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 SMCG120CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG120CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG120CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG120CA-E3/9AT?
SMCG120CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG120CA-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 SMCG120CA-E3/9AT?
For technical support, including SMCG120CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG120CA-E3/9AT requirements.
6.How does Aetrix verify that SMCG120CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG120CA-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 SMCG120CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG120CA-E3/9AT?
All SMCG120CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG120CA-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 SMCG120CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCG120CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG120CA-E3/9AT Tags
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