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Vishay General Semiconductor - Diodes Division SMCJ18CA-E3/9AT
- Part No.:
- SMCJ18CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18CA-E3/9AT.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,810
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Product details
Overview
SMCJ18CA-E3/9AT from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 1500 W peak pulse power rating, 18 V standoff voltage (VWM), and 29.2 V maximum clamping voltage (VC) at 51.4 A IPPM under 10/1000 µs waveform. It protects sensitive signal lines and power rails in automotive sensor interfaces and industrial control I/O.
For engineers reviewing the SMCJ18CA-E3/9AT datasheet, SMCJ18CA-E3/9AT pinout, SMCJ18CA-E3/9AT application, or SMCJ18CA-E3/9AT equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification eligibility (via HE3/HM3 variants), low thermal resistance (RθJL = 15 °C/W), and compatibility with automated SMT placement on 8 mm × 8 mm copper pads.
Technical Context
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM), while the SMC package supports high surge current handling (IPPM = 51.4 A) with minimal incremental surge resistance.
The device complies with ANSI/IEEE C62.35 for surge protector characterization and meets J-STD-020 MSL Level 1 moisture sensitivity. Its 0.092 %/°C temperature coefficient of VBR ensures predictable clamping voltage drift across -55 °C to +150 °C operating range, critical for under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin below breakdown. |
| VBR min/max | 20.0 V / 22.1 V at IT = 1.0 mA - Confirmed breakdown threshold range ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 29.2 V at 51.4 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected circuitry. |
| PPPM | 1500 W - Peak pulse power dissipation capability; enables robust protection against IEC 61000-4-5 Level 4 surges. |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance; supports high-reliability operation with minimal self-heating during repetitive transients. |
| TJ max | +150 °C - Maximum junction temperature; allows deployment in engine control units and powertrain modules. |
| ID @ VWM | ≤1.0 µA - Reverse leakage current at standoff voltage; minimizes standby power loss in battery-powered systems. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H), matte tin-plated leads compliant with J-STD-002 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | One terminal of symmetrical PN junction; conducts during negative voltage excursions relative to cathode reference. |
| Cathode | Transient current entry (positive half-cycle) | Second terminal of symmetrical PN junction; conducts during positive voltage excursions; no band marking for bidirectional types. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without external polarity management. |
| 1500 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges up to 4 kV/2 Ω without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes voltage overshoot during fast transients, preserving integrity of 3.3 V/5 V logic interfaces. |
| MSL Level 1 rating | Allows unlimited floor life and reflow compatibility with standard lead-free profiles (peak 260 °C). |
| AEC-Q101 qualification path | HE3/HM3 suffix variants support automotive-grade reliability validation for ADAS sensor front-ends and body electronics. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN FD and LIN bus transceivers from load dump and ESD in vehicle door modules and seat controllers. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector interface to clamp ±25 kV ESD (IEC 61000-4-2) and 100 V load dump spikes. Use Value: Prevents latch-up or permanent damage to transceiver ICs by limiting induced voltage to ≤29.2 V during 51.4 A surge events. | Use Scenario: Shielding analog input channels (4–20 mA, 0–10 V) in programmable logic controllers from field wiring-induced surges. IC Role / Device Role / Timing Role: Primary surge shunt mounted adjacent to terminal block to divert energy before reaching precision ADC front-end. Use Value: Maintains signal integrity by holding clamped voltage below 30 V, avoiding saturation of op-amp input stages and protecting downstream isolation barriers. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Safeguarding Ethernet PHY magnetics and PoE injectors against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-stage protection on RJ45 jack side, coordinated with GDT and MOV secondary stages. Use Value: Fast response (<1 ps) and low VC ensure Ethernet signal eye diagram remains compliant after 1.2/50 µs surge exposure. | Use Scenario: Input-stage transient suppression in USB-C PD adapters subjected to mains-borne switching noise and hot-plug events. IC Role / Device Role / Timing Role: Parallel-connected TVS across primary-side bulk capacitor to absorb line-to-line and line-to-ground transients. Use Value: 1500 W rating handles repetitive 6 kV ring wave surges per IEC 61000-4-4, extending capacitor lifetime and reducing audible noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC18CA | Lower PPPM (600 W), same VWM (18 V), higher VC (32.4 V), SOD-123FL package | Not suitable for high-energy surges; limited to low-power signal lines with <20 A IPPM requirement | Select when board space is constrained and surge threat level is Class 2 (IEC 61000-4-5). |
| TPSMD18CA | Same PPPM (1500 W), identical VWM/VC specs, but optimized for lower leakage (0.5 µA) and tighter VBR tolerance (±5%) | Better suited for battery-backed systems where standby current must be minimized | Prefer for medical or portable equipment requiring ultra-low ID and enhanced parametric consistency. |
Compared with SAC18CA and TPSMD18CA, the SMCJ18CA-E3/9AT delivers superior surge robustness in compact SMC packaging, making it optimal for automotive and industrial applications demanding proven 1500 W capability and AEC-Q101 upgrade path-without compromising PCB layout flexibility or thermal performance.
Availability
SMCJ18CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection circuits, and consumer power adapter designs requiring stable component supply and full traceability.
Supply support for SMCJ18CA-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 SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where failure resilience and long-term stability are mandatory.
FAQ
What is the clamping voltage of the SMCJ18CA-E3/9AT at its rated peak pulse current?
The SMCJ18CA-E3/9AT has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current (IPPM) of 51.4 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88394. The SMCJ18CA-E3/9AT maintains this clamping performance across its full operating temperature range.
Is the SMCJ18CA-E3/9AT suitable for automotive applications?
Yes-the SMCJ18CA-E3/9AT is RoHS-compliant and compatible with AEC-Q101 qualification when ordered with HE3 or HM3 suffixes (e.g., SMCJ18CAHE3_A/I). While the E3/9AT variant itself is commercial-grade, its construction-including glass-passivated junction, MSL Level 1 rating, and -55 °C to +150 °C TJ range-supports automotive deployment in non-safety-critical modules like body control units and infotainment interfaces. The SMCJ18CA-E3/9AT serves as the baseline for qualified versions.
How does the bidirectional design of the SMCJ18CA-E3/9AT affect its circuit placement?
The SMCJ18CA-E3/9AT has no polarity marking and functions identically in both directions, allowing placement across any two nodes requiring symmetrical overvoltage protection-such as differential signal pairs (RS-485, CAN), AC-coupled lines, or floating power domains. Unlike unidirectional TVS diodes, the SMCJ18CA-E3/9AT eliminates orientation errors during automated assembly and avoids the need for dual-device configurations. Its DO-214AB footprint remains unchanged regardless of signal polarity.
What is the thermal resistance from junction to ambient for the SMCJ18CA-E3/9AT?
The typical junction-to-ambient thermal resistance (RθJA) of the SMCJ18CA-E3/9AT is 75 °C/W when mounted on the minimum recommended pad layout (0.31" × 0.31" copper pads per terminal). However, its junction-to-lead resistance (RθJL) is only 15 °C/W-indicating efficient heat transfer to PCB copper. For sustained surge duty cycles, thermal design should prioritize internal layer copper pours and thermal vias beneath the SMC pads to manage self-heating. The SMCJ18CA-E3/9AT relies on conduction rather than convection for thermal relief.
Can the SMCJ18CA-E3/9AT replace a unidirectional TVS like SMCJ18A-E3/9AT in an existing design?
No-the SMCJ18CA-E3/9AT is bidirectional and lacks a cathode band, whereas the unidirectional SMCJ18A-E3/9AT requires correct polarity alignment to function. Substituting them without circuit review risks improper clamping during negative transients or forward conduction in DC-biased paths. If replacing SMCJ18A-E3/9AT, verify that the protected node is truly floating or AC-coupled; otherwise, retain the unidirectional version or redesign for symmetrical protection. The SMCJ18CA-E3/9AT is not a drop-in replacement for SMCJ18A-E3/9AT.
SMCJ18CA-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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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 (SMCJ)
SMCJ18CA-E3/9AT FAQ
1.How can I place an order for SMCJ18CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18CA-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 SMCJ18CA-E3/9AT reliable?
The price and inventory of SMCJ18CA-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 SMCJ18CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ18CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18CA-E3/9AT?
SMCJ18CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18CA-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 SMCJ18CA-E3/9AT?
For technical support, including SMCJ18CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18CA-E3/9AT requirements.
6.How does Aetrix verify that SMCJ18CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ18CA-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 SMCJ18CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ18CA-E3/9AT?
All SMCJ18CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18CA-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 SMCJ18CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ18CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18CA-E3/9AT Tags
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