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Vishay General Semiconductor - Diodes Division SMCJ12CA-E3/9AT
- Part No.:
- SMCJ12CA-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12CA-E3/9AT.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,871
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Product details
Overview
SMCJ12CA-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 on signal or power lines. It features 12 V standoff voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), and clamps to ≤19.9 V at 75.4 A peak surge current - used for protecting automotive sensor interfaces and industrial I/O lines.
For engineers reviewing the SMCJ12CA-E3/9AT datasheet, SMCJ12CA-E3/9AT pinout, SMCJ12CA-E3/9AT application, or SMCJ12CA-E3/9AT equivalent, key selection criteria include bidirectional clamping capability, 1500 W surge rating, SMC package compatibility with automated placement, and AEC-Q101 qualification eligibility via HE3/HM3 variants.
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 behavior and low leakage (<5 µA at VWM), while the low incremental surge resistance supports consistent clamping under repetitive transient events.
The device complies with MSL level 1 per J-STD-020 (peak reflow 260 °C), uses matte tin-plated leads solderable per J-STD-002, and achieves thermal resistance of 75 °C/W (junction-to-ambient) on standard 8.0 mm × 8.0 mm copper pads - critical for sustained surge handling in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 13.3 V / 14.7 V at 1 mA - guaranteed breakdown range defining turn-on threshold |
| VC @ IPPM | ≤19.9 V at 75.4 A - clamped voltage during 10/1000 µs surge, limiting stress on downstream ICs |
| PPPM | 1500 W - peak transient energy absorption capacity under standardized waveform |
| ID @ VWM | ≤5 µA - ultra-low leakage preserves signal integrity in high-impedance circuits |
| TJ max | +150 °C - enables operation in under-hood automotive or industrial ambient environments |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint |
Pinout & Package
SMCJ12CA-E3/9AT is a two-terminal bidirectional TVS diode housed in the SMC (DO-214AB) package. No polarity marking is present on the case, as conduction occurs identically in both directions. The terminals are matte tin-plated leads compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Either terminal serves as input/output - no directional bias required; bidirectional clamping across both pins |
| Case body | Thermal interface | Exposed metal-free plastic body; heat dissipation relies on PCB copper pad area (min. 8.0 mm × 8.0 mm per terminal) |
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 rating | Withstands high-energy transients such as ISO 7637-2 Pulse 1/2a/5a in automotive ECUs or IEC 61000-4-5 surges in industrial PLCs |
| Low clamping ratio (VC/VBR ≈ 1.41) | Minimizes overvoltage exposure to protected ICs - e.g., clamps 12 V line to <20 V during surge |
| MSL Level 1 rating | Supports lead-free reflow assembly without moisture sensitivity concerns or baking requirements |
| AEC-Q101 qualification path | HE3/HM3 variants available for automotive applications requiring stress-tested reliability (e.g., ADAS sensor modules) |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., temperature, pressure) from load dump and inductive switching spikes in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector entry point to shunt transients before reaching signal conditioning circuitry. Use Value: Clamps 12 V supply rail surges to ≤19.9 V, preventing latch-up or damage to 3.3 V/5 V microcontrollers and ADC front-ends. | Use Scenario: Safeguarding programmable logic controller (PLC) digital input modules against field-wiring induced surges and ESD events. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V DC input lines to absorb repetitive 1 kV/500 A transients per IEC 61000-4-5. Use Value: 1500 W rating ensures survivability across >1000 surge events without parameter drift, extending field service life. |
| Consumer Power Adapter Input | Telecom Line Interface |
Use Scenario: Input-stage surge suppression in wall-mounted AC/DC adapters subjected to lightning-induced surges on mains lines. IC Role / Device Role / Timing Role: Primary-level TVS placed after bridge rectifier to clamp rectified DC bus transients before bulk capacitor. Use Value: 12 V VWM aligns with typical 12–15 V adapter output rails; bidirectional operation accommodates reverse-polarity test conditions. | Use Scenario: Overvoltage protection on telephone line interface circuits (e.g., DSL modems, VoIP gateways) exposed to tip-ring surges. IC Role / Device Role / Timing Role: Differential-mode TVS across line pair to suppress common-mode and asymmetrical transients per GR-1089-CORE. Use Value: Symmetrical clamping ensures equal protection regardless of line polarity, eliminating need for dual unidirectional devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12CA-E3/61T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Suitable only for lower-energy transients (e.g., ESD-only); not recommended for ISO 7637-2 or IEC 61000-4-5 compliance | Select when board space is constrained and surge threat level is limited to human-body-model ESD (±8 kV) or contact discharge (±6 kV). |
| SMBJ12CA-E3/52T | Intermediate PPPM (600 W), SMB package (DO-214AA), RθJA = 90 °C/W | Meets basic IEC 61000-4-2/4-4 but insufficient for full IEC 61000-4-5 Level 3 (2 kV/1.2/50 µs) | Choose for cost-sensitive industrial controls where 600 W margin suffices and SMC footprint is unavailable. |
Compared with SMAJ12CA-E3/61T and SMBJ12CA-E3/52T, the SMCJ12CA-E3/9AT delivers 2.5× and 1.5× higher surge power handling respectively, enabling robust protection in automotive and heavy-industrial environments where transient energy exceeds 1 kV/500 A.
Availability
SMCJ12CA-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface designs requiring stable component supply and long-term production continuity.
Supply support for SMCJ12CA-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 belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-power transient suppression in harsh environments including automotive, industrial automation, and telecommunications infrastructure.
FAQ
What does the "CA" suffix indicate in SMCJ12CA-E3/9AT?
The "CA" suffix denotes a bidirectional configuration, meaning the SMCJ12CA-E3/9AT provides symmetrical clamping in both forward and reverse directions. This eliminates polarity concerns during layout and enables protection of AC-coupled or differential signal paths - unlike unidirectional variants (e.g., SMCJ12A) which require correct cathode orientation relative to system ground.
Is SMCJ12CA-E3/9AT RoHS-compliant and halogen-free?
Yes, the SMCJ12CA-E3/9AT carries the "E3" suffix, indicating it is RoHS-compliant and meets commercial-grade environmental specifications. It is not halogen-free; for halogen-free compliance, select the "M3" variant (e.g., SMCJ12CA-M3/9AT), which retains identical electrical performance and packaging.
Does SMCJ12CA-E3/9AT meet AEC-Q101 for automotive use?
The base SMCJ12CA-E3/9AT is not AEC-Q101 qualified, but Vishay offers automotive-grade versions under ordering codes SMCJ12CAHE3_X (RoHS + AEC-Q101) and SMCJ12CAHM3_X (halogen-free + RoHS + AEC-Q101). These variants share identical electrical specs and SMC package, differing only in qualification testing and traceability documentation.
What is the maximum clamping voltage of SMCJ12CA-E3/9AT at rated surge current?
The SMCJ12CA-E3/9AT clamps to a maximum of 19.9 V when subjected to its rated peak pulse current of 75.4 A (10/1000 µs waveform). This value is measured under standardized test conditions with 8.0 mm × 8.0 mm copper pads per terminal and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Can SMCJ12CA-E3/9AT be used in place of a unidirectional TVS like SMCJ12A?
Yes, the SMCJ12CA-E3/9AT can replace SMCJ12A in most applications, but with important design implications: its bidirectional nature removes polarity dependency, simplifying layout, yet introduces ~2× higher leakage current above ~10 V due to dual-junction structure. Verify system tolerance for reverse leakage if used in ultra-low-power standby circuits.
SMCJ12CA-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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 75.4A
- 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)
SMCJ12CA-E3/9AT FAQ
1.How can I place an order for SMCJ12CA-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12CA-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 SMCJ12CA-E3/9AT reliable?
The price and inventory of SMCJ12CA-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 SMCJ12CA-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ12CA-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12CA-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12CA-E3/9AT?
SMCJ12CA-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12CA-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 SMCJ12CA-E3/9AT?
For technical support, including SMCJ12CA-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12CA-E3/9AT requirements.
6.How does Aetrix verify that SMCJ12CA-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ12CA-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 SMCJ12CA-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ12CA-E3/9AT?
All SMCJ12CA-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12CA-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 SMCJ12CA-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ12CA-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12CA-E3/9AT Tags
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