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Vishay General Semiconductor - Diodes Division SMCJ18CA-E3/57T
- Part No.:
- SMCJ18CA-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18CA-E3/57T.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,452
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Product details
Overview
SMCJ18CA-E3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), clamping voltage of 29.2 V at 51.4 A, and operates from −55 °C to +150 °C - deployed in automotive sensor signal lines and industrial I/O interfaces.
For engineers reviewing the SMCJ18CA-E3/57T datasheet, SMCJ18CA-E3/57T pinout, SMCJ18CA-E3/57T application, or SMCJ18CA-E3/57T equivalent, key selection criteria include bidirectional clamping capability, 1500 W surge rating, RoHS-compliant matte tin terminations, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ18CA-E3/57T is a glass-passivated, junction-based TVS diode optimized for fast response (<1 ns) to transient events such as ESD, lightning-induced surges, and inductive switching spikes. Its bidirectional architecture enables symmetrical clamping in both polarities without polarity marking, supporting AC-coupled or floating signal paths.
It delivers low incremental surge resistance and stable clamping performance under repetitive transients, with thermal resistance of 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), enabling reliable operation up to 150 °C junction temperature when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 18 V - maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 20.0–22.1 V at 1 mA - precise voltage at which device transitions into avalanche conduction; ensures predictable turn-on during transients |
| VC (Clamping Voltage) | 29.2 V at 51.4 A (10/1000 µs) - peak voltage seen by protected circuit during worst-case surge; limits stress on downstream ICs |
| PPPM (Peak Pulse Power) | 1500 W - energy-handling capacity for standardized 10/1000 µs waveform; supports high-energy transient suppression |
| TJ max. | +150 °C - maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments |
| Package | SMC (DO-214AB) - surface-mount package with 8.0 mm × 8.0 mm thermal pad footprint; supports automated assembly and efficient heat dissipation |
| Compliance | AEC-Q101 qualified (via HE3/HM3 variants); RoHS-compliant, halogen-free option available; meets UL 94 V-0 flammability |
Pinout & Package
SMCJ18CA-E3/57T uses the SMC (DO-214AB) package - a 2-terminal, non-polarized surface-mount outline with no cathode band marking for bidirectional operation. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and rated for MSL Level 1 (peak reflow ≤260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One side of symmetrical PN junction; conducts during negative transients to clamp voltage |
| Cathode | Transient current entry (positive polarity) | Other side of symmetrical PN junction; conducts during positive transients to clamp voltage |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals, differential buses, and ungrounded circuits without polarity concerns |
| 1500 W peak pulse power | Withstands high-energy transients common in automotive load-dump and industrial motor-switching environments |
| Fast response time (<1 ns) | Activates before sensitive downstream components (e.g., microcontrollers, CAN transceivers) sustain damage |
| Low incremental surge resistance | Minimizes voltage overshoot during high-current surges, improving clamping precision and system reliability |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking; simplifies manufacturing logistics |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, and position sensors in engine control units and ADAS modules. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and microcontroller ADC input. Use Value: Limits transient excursions to ≤29.2 V during load dump or ISO 7637-2 pulses, preserving ADC integrity and measurement accuracy. | Use Scenario: Safeguarding RS-485, CAN, or 4–20 mA loop interfaces in programmable logic controllers and motor drives. IC Role / Device Role / Timing Role: Primary surge suppression element across differential signal pairs or supply rails. Use Value: Absorbs 1500 W surges while maintaining <1 μA leakage at 18 V, ensuring signal fidelity and long-term interface stability. |
| Consumer Power Adapter Input | Telecom Line Card Protection |
Use Scenario: Secondary-side overvoltage protection on DC outputs of wall adapters and USB PD chargers. IC Role / Device Role / Timing Role: Fast-acting shunt protector placed after DC-DC converter output filter. Use Value: Clamps fault conditions (e.g., feedback loop failure) to 29.2 V before downstream USB ports or battery management ICs are damaged. | Use Scenario: Surge protection on Ethernet PHY power rails and data line terminations in base station line cards. IC Role / Device Role / Timing Role: Standoff-rated TVS on 3.3 V or 5 V bias rails feeding high-speed transceivers. Use Value: Maintains 18 V operational margin while delivering 1500 W immunity against lightning-induced surges per IEC 61000-4-5. |
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 | Same VWM (18 V), lower PPPM (1000 W), smaller SMA package (DO-214AC) | Limited to lower-energy transients; unsuitable for automotive load-dump or industrial motor-switching | Select when board space is constrained and surge energy remains ≤1000 W |
| SMCJ18A-E3/57T | Unidirectional variant; identical VWM, VBR, VC, and PPPM; includes cathode band marking | Requires correct polarity orientation; not usable on AC or floating nodes | Choose only for DC-biased single-polarity rails where polarity is fixed and known |
Compared with SAC18CA and SMCJ18A-E3/57T, the SMCJ18CA-E3/57T uniquely combines 1500 W surge capacity, bidirectional symmetry, and SMC thermal performance - making it the preferred choice for high-reliability, polarity-agnostic protection in automotive and industrial systems.
Availability
SMCJ18CA-E3/57T is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and telecom line card surge immunity requiring stable component supply and full traceability.
Supply support for SMCJ18CA-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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure applications demanding AEC-Q101 compliance and robust surge immunity.
FAQ
What is the clamping voltage of SMCJ18CA-E3/57T at its rated peak pulse current?
The SMCJ18CA-E3/57T has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current of 51.4 A under the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and ensures downstream circuitry remains within safe voltage limits during transient events. The SMCJ18CA-E3/57T maintains this clamping performance across its full operating temperature range.
Is SMCJ18CA-E3/57T suitable for automotive applications?
Yes, the SMCJ18CA-E3/57T is RoHS-compliant and compatible with AEC-Q101-qualified variants (e.g., SMCJ18CAHE3). While the -E3/57T suffix denotes commercial-grade qualification, its electrical specs - including 1500 W PPPM, −55 °C to +150 °C operation, and MSL Level 1 - align with automotive subsystem requirements such as sensor protection and body electronics. For certified automotive use, specify the HE3 or HM3 suffix.
How does the bidirectional design of SMCJ18CA-E3/57T affect PCB layout?
The SMCJ18CA-E3/57T has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. This simplifies PCB layout for AC-coupled signals, differential buses, or floating grounds - unlike unidirectional variants such as SMCJ18A-E3/57T, which require cathode alignment. The SMCJ18CA-E3/57T uses the same SMC (DO-214AB) footprint regardless of signal polarity.
What is the thermal resistance of SMCJ18CA-E3/57T, and how does it impact derating?
The SMCJ18CA-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W when mounted on the recommended 8.0 mm × 8.0 mm copper pads. These values directly determine power derating above 25 °C ambient: for example, at 85 °C ambient, its 6.5 W steady-state power dissipation must be reduced by ~45 % to maintain TJ ≤ 150 °C. The SMCJ18CA-E3/57T datasheet provides full derating curves.
Does SMCJ18CA-E3/57T meet UL recognition standards?
Yes, the SMCJ18CA-E3/57T carries Underwriters Laboratories recognition under UL 497B (QVGQ2) for protector classification, with file number E136766. Its molding compound also meets UL 94 V-0 flammability rating. These certifications validate its suitability for safety-critical surge protection in end equipment sold in North America and other UL-recognized markets. The SMCJ18CA-E3/57T achieves this without external encapsulation or additional components.
SMCJ18CA-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:
- 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-E3/57T FAQ
1.How can I place an order for SMCJ18CA-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18CA-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 SMCJ18CA-E3/57T reliable?
The price and inventory of SMCJ18CA-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 SMCJ18CA-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ18CA-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18CA-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18CA-E3/57T?
SMCJ18CA-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18CA-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 SMCJ18CA-E3/57T?
For technical support, including SMCJ18CA-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18CA-E3/57T requirements.
6.How does Aetrix verify that SMCJ18CA-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ18CA-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 SMCJ18CA-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ18CA-E3/57T?
All SMCJ18CA-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18CA-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 SMCJ18CA-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ18CA-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18CA-E3/57T Tags
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