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Vishay General Semiconductor - Diodes Division SMCJ18C-E3/9AT
- Part No.:
- SMCJ18C-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18C-E3/9AT.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,779
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Product details
Overview
SMCJ18C-E3/9AT from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of sensitive electronics. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 1500 W peak pulse power (PPPM), and clamps transients to ≤29.2 V at 51.4 A, commonly used in automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMCJ18C-E3/9AT datasheet, SMCJ18C-E3/9AT pinout, SMCJ18C-E3/9AT application, or SMCJ18C-E3/9AT equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, 1500 W surge rating with 10/1000 µs waveform, low incremental surge resistance, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ18C-E3/9AT operates as a bi-directional avalanche diode, leveraging glass-passivated junction technology for stable, repeatable clamping in both polarities. Its electrical characteristics-including VBR min/max, ID ≤1.0 µA at VWM, and VC ≤29.2 V-are specified under standardized 10/1000 µs surge conditions per ANSI/IEEE C62.35.
Thermal performance is defined by RθJA = 75 °C/W and RθJL = 15 °C/W, with operating junction temperature spanning –55 °C to +150 °C. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse working voltage before clamping initiates |
| VBR (min/max) | 20.0 V / 22.1 V - Breakdown occurs within this range at 1.0 mA test current, ensuring predictable turn-on |
| VC @ IPPM | ≤29.2 V - Clamped voltage at 51.4 A peak pulse current, limiting stress on downstream ICs |
| PPPM | 1500 W - Peak surge power handling with 10/1000 µs waveform, suitable for lightning and inductive load transients |
| ID @ VWM | ≤1.0 µA - Low leakage ensures minimal standby power loss and signal integrity in high-impedance circuits |
| TJ Range | –55 °C to +150 °C - Enables deployment in under-hood automotive and industrial environments |
| Package | DO-214AB (SMCJ) - Surface-mount package with matte tin-plated leads, compatible with J-STD-002 soldering |
Pinout & Package
SMCJ18C-E3/9AT is a two-terminal bi-directional TVS diode housed in the DO-214AB (SMCJ) package. No polarity marking is present on bi-directional variants; terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (both) | Bi-directional surge path | Either terminal serves as input/output for transient energy absorption in either polarity |
| Case | Non-connected thermal mass | DO-214AB molded body provides mechanical stability and UL 94 V-0 flammability compliance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
| Glass passivated junction | Ensures long-term stability of VBR and low parameter drift across temperature and lifetime |
| MSL Level 1 rating | Allows unlimited floor life and reflow at peak 260 °C without preconditioning |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving protection margin for 3.3 V/5 V logic |
| RoHS-compliant E3 suffix | Meets JESD201 Class 1A whisker resistance, supporting high-reliability industrial assembly |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional clamping device placed directly at connector entry point to shunt surge energy before it reaches signal conditioning circuitry. Use Value: Clamps 1500 W transients to ≤29.2 V while maintaining <1.0 µA leakage, preserving signal fidelity and enabling AEC-Q101-compliant system certification. | Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to inductive switching noise from solenoids and contactors. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between field wiring and optocoupler input, absorbing repetitive 10/1000 µs surges without degradation. Use Value: Withstands >50,000 surge cycles at rated PPPM due to low thermal resistance (RθJL = 15 °C/W), extending field service life in factory automation. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Secondary-side surge protection on Ethernet PHY or RS-485 transceiver lines in network equipment subjected to induced lightning surges. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) bi-directional clamp limiting common-mode transients across differential pairs. Use Value: Achieves <29.2 V clamping at 51.4 A with minimal capacitance, avoiding signal distortion on 100 Mbps+ data links. | Use Scenario: Input-stage transient suppression in AC-DC adapters for smart home devices, guarding against mains-borne surges and capacitor discharge spikes. IC Role / Device Role / Timing Role: Primary-level TVS placed after bridge rectifier but before bulk capacitor to absorb line-to-line and line-to-ground transients. Use Value: 1500 W rating and –55 °C to +150 °C operation ensure reliable protection across global mains variations and ambient temperatures up to 70 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC18C-TB | Same VWM (18 V) and PPPM (1500 W), but TO-220AC package with higher RθJA (40 °C/W) and no AEC-Q101 qualification | Requires heatsinking for sustained surge duty; limited to non-automotive industrial use | Select when board space allows through-hole mounting and automotive qualification is unnecessary |
| 1.5KE18CA | Same bi-directional function and VWM, but axial DO-201 package, lower surge rating (1500 W same, but derates faster above 25 °C), and no MSL Level 1 or AEC-Q101 | Not suitable for high-density SMT layouts or automotive under-hood environments | Select only for legacy through-hole designs where rework tolerance outweighs thermal and reliability constraints |
Compared with SAC18C-TB and 1.5KE18CA, the SMCJ18C-E3/9AT offers superior surface-mount compatibility, AEC-Q101 qualification, MSL Level 1 process robustness, and optimized thermal resistance for high-reliability SMT deployments-making it the preferred choice for new automotive and industrial designs requiring zero layout rework and guaranteed surge endurance.
Availability
SMCJ18C-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMCJ18C-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, precision, and automotive-grade validation.
The SMCJ series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom infrastructure where failure modes must be mitigated without compromising signal integrity or thermal margin.
FAQ
What does the "C" suffix in SMCJ18C-E3/9AT indicate?
The "C" suffix in SMCJ18C-E3/9AT denotes a bi-directional configuration, meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike uni-directional variants (e.g., SMCJ18A), the SMCJ18C-E3/9AT has no cathode marking and functions identically regardless of terminal orientation-critical for protecting AC-coupled or differential signal paths where polarity is undefined.
Is SMCJ18C-E3/9AT AEC-Q101 qualified?
Yes, the SMCJ18C-E3/9AT is AEC-Q101 qualified, as confirmed in Vishay's official documentation (Document Number: 88394, Revision: 11-Dec-12). This qualification validates its suitability for automotive applications including engine control units, body electronics, and ADAS sensor interfaces, covering stress tests for temperature cycling, humidity, mechanical shock, and surge endurance under defined automotive environmental profiles.
What is the clamping voltage of SMCJ18C-E3/9AT at its rated peak pulse current?
The SMCJ18C-E3/9AT clamps to a maximum of 29.2 V at its rated peak pulse current (IPPM) of 51.4 A, measured using the standard 10/1000 µs double-exponential surge waveform. This clamping voltage defines the upper voltage limit imposed on protected circuitry during transient events and is critical for ensuring downstream ICs (e.g., microcontrollers or transceivers) remain within their absolute maximum ratings.
Can SMCJ18C-E3/9AT be used in place of a uni-directional SMCJ18A?
No-SMCJ18C-E3/9AT is not a drop-in replacement for SMCJ18A. While both share identical VWM (18 V) and PPPM (1500 W), the SMCJ18A is uni-directional with a cathode band and forward voltage behavior, whereas the SMCJ18C-E3/9AT is bi-directional with no polarity marking. Substituting one for the other without circuit review may cause unintended conduction or failed protection in DC-biased applications.
What PCB pad layout is recommended for optimal thermal and surge performance of SMCJ18C-E3/9AT?
Vishay specifies a minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad area per terminal for SMCJ18C-E3/9AT to achieve rated PPPM and thermal dissipation. This layout ensures adequate heat spreading during surge events and maintains RθJA ≤75 °C/W. Deviating from this recommendation-especially reducing pad size or omitting thermal vias-will degrade surge current handling and increase junction temperature beyond safe limits.
SMCJ18C-E3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- 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 (SMCJ)
SMCJ18C-E3/9AT FAQ
1.How can I place an order for SMCJ18C-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18C-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 SMCJ18C-E3/9AT reliable?
The price and inventory of SMCJ18C-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 SMCJ18C-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ18C-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18C-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18C-E3/9AT?
SMCJ18C-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18C-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 SMCJ18C-E3/9AT?
For technical support, including SMCJ18C-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18C-E3/9AT requirements.
6.How does Aetrix verify that SMCJ18C-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ18C-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 SMCJ18C-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ18C-E3/9AT?
All SMCJ18C-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18C-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 SMCJ18C-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ18C-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18C-E3/9AT Tags
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