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Vishay General Semiconductor - Diodes Division SMCJ18CA/57T
- Part No.:
- SMCJ18CA/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18CA/57T.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,940
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Product details
Overview
SMCJ18CA/57T 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 SMCJ18CA/57T datasheet, SMCJ18CA/57T pinout, SMCJ18CA/57T application, or SMCJ18CA/57T 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 SMCJ18CA/57T operates as a bi-directional avalanche diode, leveraging glass-passivated junction technology to achieve sub-nanosecond response to ESD and lightning-induced transients. Its symmetrical VBR (20.0–22.1 V) and VC (≤29.2 V) ensure consistent clamping in both polarities without polarity marking.
Thermally, it sustains 150 °C maximum junction temperature with RθJA = 75 °C/W and RθJL = 15 °C/W, enabling reliable operation under repetitive surge conditions when mounted per recommended 0.31" × 0.31" copper pad layout. It meets MSL Level 1 and JESD201 Class 1A whisker testing (E3 suffix).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 20.0 V / 22.1 V at 1.0 mA - Ensures predictable avalanche initiation across production lot |
| VC @ IPPM | ≤29.2 V at 51.4 A - Limits protected circuit voltage during 10/1000 µs surge |
| PPPM | 1500 W - Peak transient energy absorption capability per single event |
| ID @ VWM | ≤1.0 µA - Ultra-low leakage preserves signal integrity in high-impedance circuits |
| TJ max | +150 °C - Enables use in under-hood automotive and industrial environments |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling and HTRB |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, bi-directional configuration with no polarity marking. Matte tin-plated leads, RoHS-compliant (E3), solderable per J-STD-002/JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Bi-directional terminals-either end serves as anode or cathode depending on transient polarity; no band marking required |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| AEC-Q101 qualification | Validates suitability for automotive applications including engine control, ADAS sensors, and infotainment I/O |
| Glass-passivated junction | Improves long-term stability and reduces parameter drift under thermal stress and humidity |
| MSL Level 1 rating | Allows unlimited floor life and reflow at peak 260 °C without preconditioning |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a) |
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 inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional TVS placed directly at connector or IC input to clamp ±29.2 V surges before reaching downstream signal conditioning circuitry. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V interface ICs while maintaining signal fidelity due to <1.0 µA leakage at 18 V. | Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and motor drive noise in factory automation. IC Role / Device Role / Timing Role: Primary surge suppression device on 24 V DC input channels, absorbing up to 1500 W pulses without degradation. Use Value: Eliminates need for external series impedance or RC filtering, reducing BOM count and PCB area while meeting IEC 61000-4-5 Level 4 immunity requirements. |
| Telecom Line Interface | Consumer Power Adapter Feedback Loop |
Use Scenario: Shielding Ethernet PHY magnetics and RS-485 transceivers from ESD and lightning-induced surges in outdoor telecom equipment. IC Role / Device Role / Timing Role: Secondary-level protection aligned with primary gas discharge tube (GDT), providing fast-response clamping after GDT fires. Use Value: Achieves <1 ns response time to complement slower primary protectors, limiting let-through voltage to safe levels for PHY ICs. | Use Scenario: Securing optocoupler feedback paths in isolated AC/DC adapters against secondary-side transients caused by mains surges or transformer ringing. IC Role / Device Role / Timing Role: Bi-directional clamp across feedback resistor network to prevent false regulation or controller shutdown during transient events. Use Value: Maintains stable output regulation during 1500 W surges without requiring additional isolation or snubbing components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | Lower PPPM (600 W), same VWM/VBR/VC, SMB package (smaller footprint, higher RθJA) | Suitable for space-constrained consumer designs with lower surge exposure | Select when board area is critical and peak surge energy remains ≤600 W |
| 1.5KE18CA | Through-hole TO-218 package, same electrical specs, higher thermal mass but incompatible with SMT | Used in legacy industrial power supplies where manual assembly or high-reliability through-hole mounting is required | Choose only if SMT is not available and mechanical robustness outweighs automation benefits |
Compared with SMBJ18CA and 1.5KE18CA, the SMCJ18CA/57T delivers optimal balance of 1500 W surge handling, AEC-Q101 qualification, and SMT manufacturability in DO-214AB-making it preferred for new automotive and industrial designs requiring high-energy transient immunity without compromising production scalability.
Availability
SMCJ18CA/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer power adapter feedback circuits requiring stable component supply and full traceability.
Supply support for SMCJ18CA/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 performance.
The SMCJ series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-energy transient suppression in harsh environments-including automotive, industrial, and telecom infrastructure-where AEC-Q101 compliance and 1500 W surge capability are mandatory.
FAQ
What is the clamping voltage of the SMCJ18CA/57T under a 10/1000 µs surge?
The SMCJ18CA/57T clamps to a maximum of 29.2 V when subjected to its rated peak pulse current of 51.4 A using the standard 10/1000 µs waveform. This value is measured at the device terminals and reflects worst-case voltage let-through during surge events, ensuring downstream ICs remain within safe operating limits. The SMCJ18CA/57T achieves this with low incremental surge resistance and symmetrical bi-directional structure.
Is the SMCJ18CA/57T suitable for automotive applications?
Yes, the SMCJ18CA/57T is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, ADAS sensor interfaces, and body electronics. Its DO-214AB package, 150 °C maximum junction temperature, and validation across temperature cycling, HTRB, and ESD tests confirm suitability for under-hood and cabin environments. The SMCJ18CA/57T meets stringent automotive reliability requirements without derating.
Does the SMCJ18CA/57T have polarity markings?
No, the SMCJ18CA/57T is a bi-directional TVS diode and carries no polarity marking-consistent with the "CA" suffix designation. Its symmetrical construction means either terminal functions identically under positive or negative transients. This eliminates orientation errors during automated placement and simplifies layout for AC-coupled or floating signal paths. The SMCJ18CA/57T relies on identical VBR and VC characteristics in both directions.
What is the maximum leakage current of the SMCJ18CA/57T at its stand-off voltage?
The SMCJ18CA/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 loading on high-impedance sensor outputs or feedback networks, preserving accuracy and power efficiency. The SMCJ18CA/57T maintains this specification across its full operating temperature range per Vishay's characterization data.
Can the SMCJ18CA/57T be used in place of a unidirectional TVS like SMCJ18A?
No-the SMCJ18CA/57T is bi-directional and not a drop-in replacement for unidirectional SMCJ18A. While both share VWM (18 V) and similar VBR/VC values, the SMCJ18A has a cathode band and conducts only in reverse bias, whereas the SMCJ18CA/57T clamps in both polarities. Substituting the SMCJ18CA/57T in a unidirectional design may cause unintended forward conduction or altered circuit behavior. Always verify polarity requirements before selecting the SMCJ18CA/57T.
SMCJ18CA/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:
- 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/57T FAQ
1.How can I place an order for SMCJ18CA/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18CA/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/57T reliable?
The price and inventory of SMCJ18CA/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/57T is usually 5 days.
3.What payment methods are accepted for SMCJ18CA/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18CA/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18CA/57T?
SMCJ18CA/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18CA/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/57T?
For technical support, including SMCJ18CA/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18CA/57T requirements.
6.How does Aetrix verify that SMCJ18CA/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ18CA/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/57T meets industry standards.
7.What is the process for return or replacement of SMCJ18CA/57T?
All SMCJ18CA/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18CA/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/57T part is unused and in its original packaging.
Return procedure for SMCJ18CA/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18CA/57T Tags
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