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Taiwan Semiconductor Corporation SMCJ12CA
- Part No.:
- SMCJ12CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12CA.pdf
- Description:
- TVS DIODE 12VWM 19.9VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:6,996
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Product details
Overview
SMCJ12CA from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 12V working stand-off voltage (VWM), 13.3–14.7V breakdown voltage (VBR), and 19.9V maximum clamping voltage (VC) at 79A peak pulse current - designed for automotive load-dump and ESD protection in power supply rails and I/O interfaces.
For engineers reviewing the SMCJ12CA datasheet, SMCJ12CA pinout, SMCJ12CA application, or SMCJ12CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, <1µA reverse leakage above 10V, and DO-214AB thermal performance (RθJA = 55°C/W).
Technical Context
The SMCJ12CA implements a glass-passivated silicon junction optimized for fast transient suppression, delivering symmetrical clamping in both directions due to its CA (bidirectional) configuration. It sustains 1500W peak pulse power (10/1000µs waveform) and operates across –55°C to +150°C junction temperature range.
Its electrical behavior follows ANSI/IEEE C62.35 standards, with clamping validated at IT = 1mA for VBR and IPPM = 79A for VC. Thermal design leverages RθJC = 10°C/W and RθJA = 55°C/W, enabling reliable operation under sustained surge conditions when mounted on adequate copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 13.3 V / 14.7 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold |
| VC @ IPPM | 19.9 V - Clamped voltage seen by protected circuit during 79 A 10/1000 µs surge |
| PPK | 1500 W - Peak pulse power handling per single non-repetitive 10/1000 µs transient |
| IR @ VWM | <1 µA - Negligible leakage current ensures minimal standby power loss and signal integrity |
| TJ max | +150 °C - Maximum junction temperature supports under-hood automotive and industrial ambient environments |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with matte tin-plated leads, J-STD-002 solderable |
Pinout & Package
DO-214AB (SMC) package: surface-mount, molded plastic case with cathode band marking; polarity is symmetric for bidirectional operation - no anode/cathode distinction required in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Either terminal serves as input/output; clamps voltage excursions above ±19.9 V regardless of polarity |
| Case (body) | Thermal and mechanical interface | Provides primary heat dissipation path to PCB copper; requires ≥100 mm² 2-oz copper pad for full 1500W rating |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for automotive transients including Pulse 1 (inductive load dump), Pulse 2a/2b (switching spikes), and Pulse 3a/3b (ESD/coupled noise) |
| Sub-1 ps response time | Enables clamping before sensitive downstream ICs experience overvoltage stress - critical for CAN, LIN, and sensor interfaces |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard SMT assembly without dry-pack handling |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained applications |
| UL 94V-0 molding compound | Self-extinguishing encapsulation prevents flame propagation in high-energy fault events |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12V battery rail in engine control units exposed to load-dump pulses up to 120V and ISO 7637-2 Pulse 1. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed upstream of DC-DC converters and microcontroller power inputs. Use Value: Limits transient voltage to ≤19.9V, preventing latch-up or permanent damage to 3.3V/5V logic supplies and analog front-ends. | Use Scenario: 4–20mA current-loop transmitter connected to field sensors in factory automation systems. IC Role / Device Role / Timing Role: Primary overvoltage guard on loop-powered analog output pins against induced surges and wiring faults. Use Value: Maintains signal integrity during 1kV EFT bursts by clamping within 19.9V while adding <1µA leakage at 12V nominal. |
| LED Driver Input Stage | USB-C Port ESD Guard |
Use Scenario: Constant-current LED driver board powered from 12V vehicle bus, subject to ignition noise and alternator ripple. IC Role / Device Role / Timing Role: First-line transient suppressor at DC input connector, ahead of bulk capacitor and controller IC. Use Value: Absorbs 1500W surges without degradation, preserving driver MOSFET gate oxide integrity and PWM timing stability. | Use Scenario: USB-C receptacle on portable medical device requiring IEC 61000-4-2 Level 4 (±15kV air, ±8kV contact) ESD immunity. IC Role / Device Role / Timing Role: Bidirectional TVS on VBUS and CC lines to shunt ESD energy before reaching USB PD controller. Use Value: Clamps ±15kV ESD events to <±20V within <1ps, meeting USB-IF compliance without signal distortion or data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA | 600W peak power rating, same VWM/VBR/VC specs, SMB package (smaller footprint, higher RθJA = 85°C/W) | Limited to lower-energy transients; unsuitable for full ISO 7637-2 Pulse 1 compliance in 12V systems | Select when board space is constrained and surge energy is limited to IEC 61000-4-5 Level 3 (0.5kV) |
| 1.5KE12CA | Through-hole TO-204AA (DO-41), 1500W rating, identical electrical specs but slower response (~1ns) and no moisture level 1 rating | Not suitable for automated SMT lines; requires wave soldering and adds assembly cost | Select only for legacy through-hole designs where rework flexibility outweighs SMT efficiency |
Compared with SMBJ12CA and 1.5KE12CA, the SMCJ12CA uniquely balances 1500W surge capacity, sub-1ps response, DO-214AB SMT compatibility, and ISO 7637-2 qualification - making it the preferred choice for new automotive and industrial PCB designs requiring robust, automated, and standards-compliant transient protection.
Availability
SMCJ12CA is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial sensor I/O protection, and LED lighting driver inputs requiring stable component supply across extended production lifecycles.
Supply support for SMCJ12CA 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power devices since 1979.
The SMCJ series was developed specifically for high-energy transient suppression in automotive and industrial environments, emphasizing ISO 7637-2 compliance, SMT manufacturability, and long-term reliability under thermal cycling.
FAQ
What does the 'CA' suffix indicate in SMCJ12CA?
The 'CA' suffix in SMCJ12CA denotes a bidirectional configuration - meaning the device provides symmetrical transient voltage clamping in both polarities. Unlike unidirectional variants (e.g., SMCJ12A), the SMCJ12CA has no designated anode or cathode and functions identically whether voltage is applied positive or negative relative to ground. This makes it ideal for AC-coupled lines, differential buses like CAN, and floating power domains where polarity reversal may occur.
Does SMCJ12CA meet ISO 7637-2 for automotive applications?
Yes, the SMCJ12CA is explicitly rated to meet ISO 7637-2 requirements for automotive transient immunity, covering Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling and ESD-related noise). Its 1500W peak power rating, 19.9V clamping voltage at 79A, and sub-1ps response ensure compliance when properly mounted on ≥100 mm² 2-oz copper. Test reports per ISO 7637-2 are available upon request from Taiwan Semiconductor.
What is the maximum clamping voltage of SMCJ12CA and at what current is it specified?
The maximum clamping voltage (VC) of the SMCJ12CA is 19.9 V, measured at a peak impulse current (IPPM) of 79 A using the standardized 10/1000 µs double-exponential waveform. This value represents the highest voltage that will appear across the protected circuit during a worst-case transient event, ensuring downstream components rated for ≤20 V absolute maximum survive the surge. The clamping is guaranteed across the full operating temperature range (–55°C to +150°C).
Can SMCJ12CA be used in place of a unidirectional TVS like SMCJ12A?
No - the SMCJ12CA and SMCJ12A are not interchangeable without circuit review. While both share identical VWM (12 V), VBR (13.3–14.7 V), and VC (19.9 V), the SMCJ12A is unidirectional and requires correct polarity placement (cathode toward positive rail), whereas the SMCJ12CA is bidirectional and polarity-agnostic. Substituting one for the other may result in improper clamping or failure to protect during reverse-polarity transients. Layout and schematic must be verified before replacement.
What is the thermal resistance and how does it affect PCB layout for SMCJ12CA?
The SMCJ12CA has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case (RθJC) of 10°C/W. To sustain its full 1500W rating, the PCB must provide sufficient copper area - Taiwan Semiconductor recommends ≥100 mm² of 2-ounce copper connected directly to both terminals. Reducing copper area increases RθJA, derating peak power capability; for example, 25 mm² copper raises RθJA to ~90°C/W, limiting usable surge energy by >40%. Thermal vias under the pad further improve heat transfer.
SMCJ12CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- 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:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ12CA FAQ
1.How can I place an order for SMCJ12CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12CA 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 reliable?
The price and inventory of SMCJ12CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12CA is usually 5 days.
3.What payment methods are accepted for SMCJ12CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12CA?
SMCJ12CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12CA 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?
For technical support, including SMCJ12CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12CA requirements.
6.How does Aetrix verify that SMCJ12CA is sourced from the original manufacturer or authorized distributors?
All SMCJ12CA 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 meets industry standards.
7.What is the process for return or replacement of SMCJ12CA?
All SMCJ12CA units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12CA, 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 part is unused and in its original packaging.
Return procedure for SMCJ12CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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