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Vishay General Semiconductor - Diodes Division SMCG18C-E3/9AT
- Part No.:
- SMCG18C-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AB, SMC Gull Wing
- Datasheet:
-
SMCG18C-E3/9AT.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO215AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,772
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Product details
Overview
SMCG18C-E3/9AT from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) in DO-215AB (SMCG) package, rated for 18 V stand-off voltage (VWM), 1500 W peak pulse power (PPPM), and clamping voltage of 29.2 V at 54.3 A IPPM. It provides robust ESD and surge protection for automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMCG18C-E3/9AT datasheet, SMCG18C-E3/9AT pinout, SMCG18C-E3/9AT application, or SMCG18C-E3/9AT equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), DO-215AB mechanical dimensions, and direct alternatives with documented clamping and leakage differences.
Technical Context
This bi-directional TVS diode operates symmetrically in both polarities, with breakdown voltage (VBR) specified at 20.0–22.1 V (IT = 1.0 mA), enabling balanced overvoltage clamping on AC-coupled or differential signal paths. Its low incremental surge resistance and fast response time ensure effective suppression of 10/1000 µs transients without signal distortion.
Designed for surface-mount automated assembly, it features glass-passivated junction, matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and meets MSL Level 1 (260 °C peak reflow). The device is AEC-Q101 qualified and UL recognized under file E136766 for protector classification per UL 497B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range for protected lines. |
| PPPM | 1500 W - Peak pulse power handling capability under 10/1000 µs waveform; determines survivability against lightning or inductive-switching surges. |
| VC @ IPPM | 29.2 V at 54.3 A - Clamping voltage during maximum surge event; ensures downstream ICs (e.g., CAN transceivers, ADC inputs) remain below absolute max ratings. |
| ID @ VWM | 1.0 µA - Reverse leakage at stand-off voltage; negligible loading on high-impedance sensor or communication lines. |
| 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 8.0 mm × 8.0 mm copper pads; informs heatsinking requirements for sustained surge duty cycles. |
Pinout & Package
DO-215AB (SMCG) surface-mount package: gull-wing lead configuration, 0.310" × 0.400" footprint (7.87 mm × 10.16 mm), 0.024" lead pitch (0.61 mm), RoHS-compliant matte tin plating, no polarity marking for bi-directional function.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional current path | No functional polarity - either terminal serves as anode or cathode depending on transient polarity; enables single-device protection of AC or differential signals. |
| Case / Body | Thermal and mechanical interface | Exposed copper pad area (per JEDEC MO-237) provides primary heat dissipation path to PCB; requires 8.0 mm × 8.0 mm copper pads per terminal per datasheet fig. 2. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - required for engine control, ADAS sensor, and body electronics. |
| UL 497B recognition (E136766) | Third-party safety certification for telecom and industrial surge protectors - simplifies end-equipment compliance testing. |
| MSL Level 1 rating | Unlimited floor life and compatibility with standard 260 °C Pb-free reflow profiles - eliminates baking requirements and supports high-yield SMT manufacturing. |
| Glass-passivated junction | Enhanced moisture resistance and long-term stability of VBR and leakage - critical for field-deployed equipment in humid or condensing environments. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) in engine control modules from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bi-directional clamping element placed directly at connector entry point to limit transient voltages before reaching MCU ADC or LIN transceiver input pins. Use Value: Maintains signal integrity by clamping transients to ≤29.2 V while drawing <1 µA at 18 V - avoids false triggering or damage to 3.3 V/5 V logic interfaces. | Use Scenario: Safeguarding RS-485 or CAN FD transceiver signal pairs in programmable logic controllers (PLCs) exposed to motor drive noise and ground bounce. IC Role / Device Role / Timing Role: Differential line protector mounted across A/B lines with symmetrical clamping action, eliminating need for dual uni-directional devices. Use Value: Delivers 1500 W surge immunity without polarity sensitivity - reduces BOM count and PCB area versus discrete anode/cathode solutions. |
| Consumer Audio Line Protection | Telecom DSL Line Interface |
Use Scenario: Shielding headphone jack or microphone input circuits in smart speakers from ESD events (>15 kV contact discharge per IEC 61000-4-2). IC Role / Device Role / Timing Role: Front-end TVS placed between connector and audio codec, leveraging fast response (<1 ns) to shunt ESD current before internal ESD diodes activate. Use Value: Low 1.0 µA leakage preserves high-impedance bias networks; 29.2 V clamping prevents latch-up in 3.3 V audio amplifiers. | Use Scenario: Protecting ADSL/VDSL line drivers and receivers from lightning-induced surges on twisted-pair telephone lines. IC Role / Device Role / Timing Role: Primary surge limiter in hybrid coupler stage, rated for UL 497B Class B protector classification (file E136766). Use Value: 1500 W PPPM and 209 °C/W RθJL enable reliable multi-event surge handling without thermal runaway in sealed DSLAM chassis. |
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) and PPPM (400 W), but lower power rating; DO-214AC (SMA) package, RθJA = 110 °C/W. | Limited to lower-energy transients (e.g., IEC 61000-4-5 Level 3); unsuitable for automotive load dump or industrial 10/1000 µs surges. | Select SMAJ18CA only for cost-sensitive consumer applications where 400 W surge capacity suffices and board space allows larger SMA footprint. |
| 1.5KE18CA | Higher PPPM (1500 W), but axial-leaded DO-201AD package; not surface-mountable, RθJA ≈ 50 °C/W with heatsink. | Requires through-hole assembly and external heatsinking; incompatible with automated SMT lines and compact PCB layouts. | Choose 1.5KE18CA only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with SMAJ18CA and 1.5KE18CA, SMCG18C-E3/9AT uniquely combines AEC-Q101 qualification, DO-215AB gull-wing geometry for fine-pitch SMT, 1500 W surge rating, and UL 497B recognition - making it the only drop-in solution for production automotive and industrial SMT assemblies requiring certified high-power transient suppression.
Availability
SMCG18C-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line card protection requiring stable component supply, AEC-Q101 compliance, and UL-certified surge performance.
Supply support for SMCG18C-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 optimization.
The SMCG series was developed specifically for high-reliability surface-mount transient suppression in automotive and industrial environments, targeting AEC-Q101 compliance, UL recognition, and robust 10/1000 µs surge handling in compact gull-wing packages.
FAQ
What is the clamping voltage of SMCG18C-E3/9AT and how is it measured?
The clamping voltage (VC) of SMCG18C-E3/9AT is 29.2 V, measured at peak pulse current (IPPM) of 54.3 A under standardized 10/1000 µs waveform conditions per ANSI/IEEE C62.35. This value reflects the maximum voltage seen across the device during worst-case surge events and is critical for ensuring protected ICs remain within their absolute maximum ratings. SMCG18C-E3/9AT maintains this clamping performance across its full operating temperature range.
Is SMCG18C-E3/9AT suitable for automotive applications?
Yes, SMCG18C-E3/9AT is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, ADAS sensors, and body electronics. Its DO-215AB package supports automated SMT assembly, and its 1500 W PPPM rating handles ISO 7637-2 load dump and pulse 5a/b transients. SMCG18C-E3/9AT also carries UL 497B recognition (file E136766), further validating its suitability for safety-critical vehicle subsystems.
Does SMCG18C-E3/9AT have polarity markings?
No, SMCG18C-E3/9AT is a bi-directional TVS diode and carries no polarity marking on the package. As stated in the Vishay datasheet, "no marking on bi-directional types." This symmetry allows flexible placement on PCBs protecting AC-coupled signals, differential buses (e.g., CAN, RS-485), or any circuit where transient polarity is unpredictable - eliminating orientation errors during assembly and reducing design complexity compared to uni-directional alternatives.
What is the thermal resistance of SMCG18C-E3/9AT and how does it affect layout?
SMCG18C-E3/9AT 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, as defined in the datasheet. This value directly impacts PCB layout: undersized pads increase thermal impedance, risking junction overheating during repeated surges. To maintain reliability, designers must adhere strictly to the recommended pad dimensions and ensure adequate copper area and via stitching to internal ground planes - especially in high-duty-cycle industrial applications.
How does SMCG18C-E3/9AT differ from SMCG18A?
SMCG18C-E3/9AT is the bi-directional variant (CA suffix), while SMCG18A is uni-directional (A suffix). Key differences include: SMCG18C-E3/9AT has no polarity band, symmetric VBR (20.0–22.1 V), and identical clamping in both directions; SMCG18A features a cathode band, forward voltage (VF = 3.5 V at 100 A), and higher IFSM (200 A). SMCG18C-E3/9AT is used for AC/differential protection; SMCG18A suits DC rail or unidirectional signal clamping. Both share same PPPM (1500 W) and DO-215AB package.
SMCG18C-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 46.6A
- 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)
SMCG18C-E3/9AT FAQ
1.How can I place an order for SMCG18C-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCG18C-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 SMCG18C-E3/9AT reliable?
The price and inventory of SMCG18C-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 SMCG18C-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCG18C-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCG18C-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCG18C-E3/9AT?
SMCG18C-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCG18C-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 SMCG18C-E3/9AT?
For technical support, including SMCG18C-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCG18C-E3/9AT requirements.
6.How does Aetrix verify that SMCG18C-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCG18C-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 SMCG18C-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCG18C-E3/9AT?
All SMCG18C-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCG18C-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 SMCG18C-E3/9AT part is unused and in its original packaging.
Return procedure for SMCG18C-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCG18C-E3/9AT Tags
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