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Vishay General Semiconductor - Diodes Division SMCJ20CA-E3/9AT
- Part No.:
- SMCJ20CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ20CA-E3/9AT.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,683
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Product details
Overview
SMCJ20CA-E3/9AT from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 1500 W peak pulse power with a 10/1000 µs waveform. It features a 20 V standoff voltage (VWM), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, and clamps to ≤32.4 V at 46.3 A peak pulse current. It protects signal lines and power rails in automotive sensor interfaces and industrial control I/O.
For engineers reviewing the SMCJ20CA-E3/9AT datasheet, SMCJ20CA-E3/9AT pinout, SMCJ20CA-E3/9AT application, or SMCJ20CA-E3/9AT 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
This TVS diode operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or differential signal paths without polarity concerns. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, critical for consistent clamping under repetitive transient events.
The device meets AEC-Q101 qualification when ordered with HE3/HM3 suffixes, but SMCJ20CA-E3/9AT is commercial-grade RoHS-compliant. Thermal resistance is 75 °C/W (junction-to-ambient) and 15 °C/W (junction-to-lead), supporting reliable operation up to 150 °C junction temperature with appropriate PCB copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working range for protected circuit. |
| VBR min/max | 22.2 V / 24.5 V at 1 mA - Confirmed breakdown threshold window; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | ≤32.4 V at 46.3 A - Clamped voltage during 1500 W transient; determines maximum stress imposed on downstream ICs. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 µs waveform; quantifies robustness against lightning or ESD surges. |
| TJ max | +150 °C - Maximum junction temperature; sets thermal design margin for PCB layout and power derating. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 8.0 mm × 8.0 mm thermal pad requirement; supports automated assembly. |
Pinout & Package
SMCJ20CA-E3/9AT uses the SMC (DO-214AB) package: a two-terminal, non-polarized surface-mount case with no cathode marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Acts as conduction terminal during positive or negative transients; requires symmetrical PCB routing for balanced protection. |
| Cathode | Transient return path (bidirectional) | Electrically identical to anode in bidirectional configuration; no polarity marking on device body. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or ungrounded power rails without polarity constraints. |
| 1500 W peak pulse power | Withstands high-energy transients such as ISO 7637-2 Pulse 5a (load dump) in automotive 12 V systems when properly mounted. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping-critical for safeguarding 3.3 V or 5 V logic interfaces adjacent to protected lines. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free reflow profiles without preconditioning; eliminates moisture-related popcorning risk. |
| Glass-passivated junction | Provides stable VBR over temperature and lifetime, reducing parameter drift in harsh industrial environments. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN FD or LIN bus transceivers from load dump and jump-start induced transients in engine control modules. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential signal pair or supply rail to clamp ±30 V surges within nanoseconds. Use Value: Prevents latch-up or permanent damage to transceiver ICs by limiting voltage to ≤32.4 V during 1500 W pulses. | Use Scenario: Safeguarding analog input channels (e.g., 4–20 mA loops) in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Standoff-connected TVS shunting transients before signal conditioning amplifiers or ADC front-ends. Use Value: Maintains measurement integrity by suppressing >20 V transients while adding <1 nA leakage at 20 V. |
| Telecom Line Interface | Consumer Power Adapter Input |
Use Scenario: Shielding Ethernet PHY magnetics or DSL line drivers from induced lightning surges in outdoor telecom equipment. IC Role / Device Role / Timing Role: Primary-level TVS on secondary side of isolation transformer, clamping common-mode transients. Use Value: Enables compliance with ITU-T K.21 basic protection level using a single SMC footprint with 1500 W rating. | Use Scenario: Input-stage surge suppression in wall-mounted USB-C PD adapters subjected to mains-borne fast transients. IC Role / Device Role / Timing Role: First-line defense across AC-DC rectifier output or DC bus, absorbing energy before primary controller ICs. Use Value: Survives 10× IEC 61000-4-5 1.2/50 µs surge tests at 1 kV due to low Rdyn and repeatable clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA-E3/52T | Lower PPPM (600 W), smaller SMB (DO-214AA) package, same VWM/VBR range. | Not suitable for 1500 W surge requirements; limited to lower-energy IEC 61000-4-2 ESD or capacitive discharge events. | Select only if board space is constrained and surge threat level is ≤600 W. |
| SMCJ20A-E3/9AT | Unidirectional version; identical package, VWM, and PPPM, but asymmetric clamping (cathode-marked). | Requires correct polarity orientation; unsuitable for AC or floating differential signals without additional circuitry. | Choose only for DC rail protection where polarity is fixed and reverse conduction must be blocked. |
Compared with SMBJ20CA-E3/52T and SMCJ20A-E3/9AT, SMCJ20CA-E3/9AT uniquely delivers bidirectional 1500 W clamping in the SMC footprint-enabling simplified layout, polarity-agnostic placement, and higher surge immunity than SMB alternatives without requiring dual-device solutions.
Availability
SMCJ20CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line cards, and consumer power adapter designs requiring stable component supply and full traceability.
Supply support for SMCJ20CA-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 and application-specific performance.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure where robustness and repeatable clamping are mandatory.
FAQ
What does the "CA" suffix indicate in SMCJ20CA-E3/9AT?
The "CA" suffix denotes a bidirectional configuration: SMCJ20CA-E3/9AT conducts and clamps symmetrically for both positive and negative voltage transients. Unlike unidirectional variants (e.g., SMCJ20A), it has no cathode marking and is used where polarity is undefined-such as across differential data lines or AC-coupled circuits. This is confirmed in Vishay's datasheet section "DEVICES FOR BIDIRECTION APPLICATIONS".
What is the maximum clamping voltage for SMCJ20CA-E3/9AT under rated surge conditions?
The maximum clamping voltage (VC) for SMCJ20CA-E3/9AT is 32.4 V at 46.3 A peak pulse current (IPPM), measured with a 10/1000 µs waveform. This value is specified in the "ELECTRICAL CHARACTERISTICS" table of the Vishay datasheet (Document Number: 88394, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Is SMCJ20CA-E3/9AT suitable for automotive applications requiring AEC-Q101 qualification?
SMCJ20CA-E3/9AT itself is a commercial-grade RoHS-compliant part (E3 suffix) and is not AEC-Q101 qualified. However, Vishay offers AEC-Q101 versions under ordering codes SMCJ20CAHE3_X (RoHS + AEC-Q101) or SMCJ20CAHM3_X (halogen-free + AEC-Q101). The "_X" denotes revision code (e.g., A, B); qualification status is explicitly noted in the "ORDERING INFORMATION" section of the datasheet.
How much PCB copper area is required for optimal thermal performance of SMCJ20CA-E3/9AT?
Vishay specifies that SMCJ20CA-E3/9AT must be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve rated 1500 W peak pulse power and proper thermal dissipation. This pad size is referenced in the "MAXIMUM RATINGS" footnote (2) and "MECHANICAL DATA" section. Smaller pads will reduce surge capability and increase junction temperature beyond 150 °C.
Does SMCJ20CA-E3/9AT have polarity markings on the device body?
No, SMCJ20CA-E3/9AT has no polarity markings-the device is bidirectional and non-polarized. As stated in the "MECHANICAL DATA" section: "no marking on bidirectional types." This distinguishes it from unidirectional variants (e.g., SMCJ20A-E3/9AT), which feature a cathode band. Layout must treat both terminals identically, with symmetrical trace routing recommended for balanced transient response.
SMCJ20CA-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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 46.3A
- 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)
SMCJ20CA-E3/9AT FAQ
1.How can I place an order for SMCJ20CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ20CA-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 SMCJ20CA-E3/9AT reliable?
The price and inventory of SMCJ20CA-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 SMCJ20CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ20CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ20CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ20CA-E3/9AT?
SMCJ20CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ20CA-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 SMCJ20CA-E3/9AT?
For technical support, including SMCJ20CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ20CA-E3/9AT requirements.
6.How does Aetrix verify that SMCJ20CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ20CA-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 SMCJ20CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ20CA-E3/9AT?
All SMCJ20CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ20CA-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 SMCJ20CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ20CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ20CA-E3/9AT Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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