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Vishay General Semiconductor - Diodes Division SMCJ18C-E3/57T
- Part No.:
- SMCJ18C-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18C-E3/57T.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,286
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Product details
Overview
SMCJ18C-E3/57T from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for clamping voltage transients on signal or power lines. 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 to ≤29.2 V at 51.4 A IPPM under 10/1000 µs waveform - used in automotive sensor interface protection and industrial I/O line surge suppression.
For engineers reviewing the SMCJ18C-E3/57T datasheet, SMCJ18C-E3/57T pinout, SMCJ18C-E3/57T application, or SMCJ18C-E3/57T equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, 1500 W surge rating, low clamping voltage (VC ≤ 29.2 V), and DO-214AB thermal performance with RθJA = 75 °C/W.
Technical Context
The SMCJ18C-E3/57T operates as a bi-directional avalanche diode, symmetrically clamping positive and negative transients above its breakdown threshold. Its glass-passivated junction enables fast response (<1 ns), low incremental surge resistance, and stable VBR over temperature (−55 °C to +150 °C).
Designed for surface-mount placement on 8.0 mm × 8.0 mm copper pads per terminal, it meets MSL Level 1 (260 °C reflow) and JESD201 Class 1A whisker resistance. Polarity is unmarked - consistent with bi-directional device convention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse working voltage before clamping begins |
| VBR min/max | 20.0 V / 22.1 V at 1.0 mA IT - defines reliable conduction onset window for transient detection |
| VC @ IPPM | ≤29.2 V at 51.4 A - clamping voltage limits downstream IC stress during 10/1000 µs surge |
| PPPM | 1500 W - peak transient energy handling capacity under standardized waveform |
| ID @ VWM | ≤1.0 µA - ultra-low leakage preserves signal integrity in high-impedance circuits |
| TJ max | +150 °C - supports operation in under-hood automotive and industrial ambient environments |
| RθJA | 75 °C/W - thermal resistance informs heatsinking requirements for sustained power dissipation |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, bi-directional configuration with no polarity marking. Cathode band absent - terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Either terminal conducts bidirectionally during overvoltage events; no fixed anode/cathode assignment |
| Case (cathode band absent) | Thermal and mechanical anchor | DO-214AB body provides mechanical stability and thermal conduction to PCB copper pads |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Glass-passivated junction | Ensures stable VBR, low leakage, and long-term parameter consistency across life cycle |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage exposure to protected circuitry versus breakdown threshold |
| MSL Level 1 compliance | Enables standard SMT reflow without moisture-related popcorn failure risk |
| RoHS-compliant matte tin plating | Meets J-STD-002 solderability and JESD22-B102 intermetallic formation requirements |
Applications
| Automotive Sensor Interface | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional TVS clamp placed directly at connector entry point to shunt transients before reaching signal conditioning ICs. Use Value: Limits induced voltage to ≤29.2 V during 1500 W surges, preserving ±18 V rail integrity and preventing latch-up in 3.3 V/5 V microcontrollers. | Use Scenario: Safeguarding digital input modules against inductive switching spikes from solenoids, relays, and motor drives in factory automation systems. IC Role / Device Role / Timing Role: Primary surge suppression element on 24 V DC input lines, mounted adjacent to terminal block entry points. Use Value: Withstands repetitive 10/1000 µs surges up to 51.4 A while maintaining <1.0 µA leakage at 18 V - ensuring stable logic-level recognition. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
Use Scenario: Shielding Ethernet PHY interfaces and RS-485 transceivers from lightning-induced surges and cable discharge events in outdoor telecom equipment. IC Role / Device Role / Timing Role: First-line transient suppressor on differential pair lines, paired with common-mode chokes for enhanced immunity. Use Value: Symmetric clamping ensures equal protection on both signal polarities, critical for full-duplex communication integrity under ±1 kV EFT. | Use Scenario: Adding secondary-level surge protection on USB-C and barrel-jack input paths of smart home hubs and AC/DC adapters. IC Role / Device Role / Timing Role: Secondary TVS after primary MOV/fuse stage, absorbing residual fast-rising transients missed by bulk components. Use Value: Fast <1 ns response and low VC enable protection of USB PD controllers and buck converters operating near 18 V input rails. |
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-E3/61T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Suitable only for lower-energy transients; limited thermal margin in high-power industrial settings | Select when board space is constrained and surge threat level is ≤400 W (e.g., consumer USB ports) |
| 1.5KE18CA | Through-hole TO-218 package, same VWM/VC specs but higher parasitic inductance and slower effective response | Not suitable for high-frequency transient suppression (e.g., ESD > 200 MHz); requires PCB real estate for axial leads | Choose only for legacy through-hole designs where rework to SMD is not feasible |
Compared with SMAJ18CA-E3/61T and 1.5KE18CA, the SMCJ18C-E3/57T delivers 3.75× higher surge power handling and superior thermal performance in a surface-mount footprint - making it optimal for AEC-Q101-compliant automotive and high-reliability industrial deployments requiring robust 1500 W clamping.
Availability
SMCJ18C-E3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and telecom line surge suppression requiring stable component supply, traceable RoHS-compliant sourcing, and AEC-Q101 assurance.
Supply support for SMCJ18C-E3/57T 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 and application-specific optimization.
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 AEC-Q101 validation and 1500 W surge capability are mandatory.
FAQ
What is the clamping voltage of the SMCJ18C-E3/57T under a 10/1000 µs surge?
The SMCJ18C-E3/57T clamps to a maximum of 29.2 V when subjected to its rated peak pulse current of 51.4 A under the standardized 10/1000 µs waveform. This value is measured at the device terminals with specified mounting conditions (0.31" × 0.31" copper pads), and represents the upper limit of voltage seen by downstream circuitry during surge events - critical for ensuring compatibility with 3.3 V, 5 V, or 24 V system rails.
Is the SMCJ18C-E3/57T suitable for automotive applications?
Yes, the SMCJ18C-E3/57T is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes glass-passivated junctions, MSL Level 1 reflow compatibility, and guaranteed operation from −55 °C to +150 °C junction temperature - meeting requirements for engine control units, body electronics, and ADAS sensor interfaces where transient immunity and long-term reliability are essential. The "HE3" variant denotes full AEC-Q101 compliance; the "E3" suffix indicates commercial-grade RoHS compliance.
How does the bi-directional design of the SMCJ18C-E3/57T affect its layout and usage?
The SMCJ18C-E3/57T has no polarity marking and functions identically in both directions - meaning either terminal can connect to line or ground without affecting clamping behavior. This simplifies PCB layout by eliminating orientation constraints and enables direct placement across differential pairs or AC-coupled signal paths. Unlike uni-directional TVS diodes, it protects against both positive and negative transients without requiring dual-device configurations.
What is the maximum leakage current of the SMCJ18C-E3/57T at its stand-off voltage?
The SMCJ18C-E3/57T exhibits a maximum reverse leakage current (ID) of 1.0 µA when biased at its 18 V stand-off voltage (VWM) and tested at 25 °C. This ultra-low leakage ensures minimal power loss and signal distortion in high-impedance sensing circuits, such as those found in precision analog front-ends or battery-monitoring systems where standby current budget is tightly constrained.
Can the SMCJ18C-E3/57T be used in parallel for higher surge current handling?
No - the SMCJ18C-E3/57T is not recommended for parallel operation due to inherent VBR tolerances (±5 %) that cause current imbalance during transient events. Uneven sharing may lead to thermal runaway in one device, resulting in premature failure. For higher surge ratings, select a single higher-rated device (e.g., SMCJ22C-E3/57T) or implement staged protection with upstream current-limiting elements rather than paralleling identical SMCJ18C-E3/57T units.
SMCJ18C-E3/57T 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-E3/57T FAQ
1.How can I place an order for SMCJ18C-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18C-E3/57T 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-E3/57T reliable?
The price and inventory of SMCJ18C-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18C-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ18C-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18C-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18C-E3/57T?
SMCJ18C-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18C-E3/57T 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-E3/57T?
For technical support, including SMCJ18C-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18C-E3/57T requirements.
6.How does Aetrix verify that SMCJ18C-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ18C-E3/57T 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-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ18C-E3/57T?
All SMCJ18C-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18C-E3/57T, 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-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ18C-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18C-E3/57T Tags
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