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Taiwan Semiconductor Corporation SMCJ12C
- Part No.:
- SMCJ12C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12C.pdf
- Description:
- 1500W, 14.8V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,329
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Product details
Overview
SMCJ12C from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 12V working stand-off voltage (VWM), 13.3–16.3V breakdown voltage (VBR), and 22.0V maximum clamping voltage (VC) at 71A peak pulse current. It protects automotive power rails and industrial I/O interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ12C datasheet, SMCJ12C pinout, SMCJ12C application, or SMCJ12C equivalent, this page delivers verified electrical parameters, clamping performance under 10/1000μs surge, thermal resistance data, polarity marking guidance, and direct alternatives for ESD and inductive switching protection design.
Technical Context
The SMCJ12C operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (13.3–16.3V at 1mA test current). Its glass-passivated junction ensures stable breakdown and low leakage (<1μA at 12V), while fast response (<1.0ps) enables effective suppression of EFT and load-dump events.
Designed for surface-mount assembly on high-reliability PCBs, it meets J-STD-020 moisture sensitivity level 1 and JESD 201 class 2 whisker resistance. Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, supporting operation from –55°C to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 13.3 / 16.3 V - Breakdown occurs within this range at 1 mA, defining turn-on threshold tolerance |
| VC @ IPPM | 22.0 V - Clamped voltage seen across terminals during 71 A, 10/1000 μs surge |
| PPK | 1500 W - Peak pulse power handling per single non-repetitive 1 ms surge |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off voltage, ensuring minimal standby power loss |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance, critical for board-level thermal design |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with cathode band marking |
Pinout & Package
DO-214AB (SMC) package: surface-mount, molded plastic case with matte tin-plated leads; polarity indicated by cathode band on one end; weight ≈ 0.210 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V rail); cathode band marks this terminal on package |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures consistent VBR tolerance and long-term stability under thermal cycling and humidity stress |
| ISO 7637-2 compliance | Validated for automotive transient immunity including Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT) |
| Fast response time | <1.0 ps rise time enables clamping before sensitive downstream ICs experience overvoltage damage |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS directives for environmentally compliant manufacturing and end-of-life processing |
| J-STD-020 Level 1 MSL | Zero bake requirement prior to reflow; supports standard SMT assembly without moisture-related popcorning risk |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load-dump transients (up to 120 V, 400 ms) on 12 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Primary clamping device placed directly at connector entry point to limit voltage seen by LDOs and microcontrollers. Use Value: Limits peak rail voltage to ≤22.0 V during ISO 7637-2 Pulse 5a, preventing latch-up or permanent damage to 3.3 V/5 V logic. | Use Scenario: Shielding 4–20 mA current-loop transmitters from ESD events and relay-coil flyback in factory automation PLC modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed across loop supply input to absorb ±8 kV contact ESD (IEC 61000-4-2) and 600 V inductive spikes. Use Value: Clamps transients within 1.0 ps while maintaining <1 μA leakage, preserving loop accuracy and calibration integrity. |
| LED Driver Output Protection | DC-DC Converter Input Stage |
Use Scenario: Protecting constant-current LED driver outputs from reverse-polarity connection and hot-swap surges in architectural lighting systems. IC Role / Device Role / Timing Role: Mounted at driver output to clamp reverse voltage and forward surge during miswiring or cable disconnect events. Use Value: Withstands 200 A IFSM (8.3 ms half-sine) and clamps to 22.0 V, preventing MOSFET gate oxide rupture and LED string failure. | Use Scenario: Safeguarding buck converter input stages against 10/1000 μs surges induced by nearby motor drives in embedded power supplies. IC Role / Device Role / Timing Role: First-line transient absorber upstream of input filter capacitors and controller ICs. Use Value: 1500 W PPK rating handles high-energy pulses without degradation; 55 °C/W RθJA allows thermal integration into compact 2-layer PCB layouts. |
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 | 600 W PPK rating, same VWM/VBR/VC but lower surge capacity; SMB package (smaller footprint, higher RθJA) | Suitable for space-constrained consumer electronics where 1500 W surge margin is not required | Select SMCJ12C when full ISO 7637-2 Pulse 5a compliance and 71 A IPPM are mandatory |
| 1.5KE12CA | Through-hole TO-204AA (DO-41) package; identical 12 V VWM and 22 V VC, but slower response (>1 ns) and no automotive qualification | Applicable in legacy industrial equipment with through-hole assembly and less stringent transient standards | Choose SMCJ12C for automated SMT production, AEC-Q200 alignment, and sub-nanosecond response |
Compared with SMBJ12CA and 1.5KE12CA, the SMCJ12C delivers 2.5× higher peak power handling, surface-mount compatibility for high-volume manufacturing, and certified automotive transient immunity-making it the preferred choice for new 12 V system designs requiring robust, production-ready protection.
Availability
SMCJ12C is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and LED driver output safeguarding requiring stable component supply across multi-year production cycles.
Supply support for SMCJ12C 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, serving global automotive, industrial, and computing markets since 1979.
The SMCJ series belongs to TSC's high-power TVS portfolio, engineered specifically for automotive-grade transient immunity and industrial system reliability-emphasizing low clamping ratio, tight VBR tolerance, and AEC-Q200-aligned process control.
FAQ
What is the clamping voltage of the SMCJ12C under a standard 10/1000 μs surge?
The SMCJ12C exhibits a maximum clamping voltage (VC) of 22.0 V when subjected to a 71 A peak pulse current with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and ANSI/IEEE C62.35 standards and represents the upper bound voltage imposed on protected circuitry during worst-case transient events. The SMCJ12C maintains this clamping performance consistently across its specified operating temperature range.
Is the SMCJ12C unidirectional or bidirectional, and how is polarity identified?
The SMCJ12C is a unidirectional TVS diode, designed for DC line protection where reverse voltage is blocked and only positive transients on the cathode side are clamped. Polarity is marked by a distinct cathode band on the DO-214AB (SMC) package body-this band must be oriented toward the protected line (e.g., 12 V rail), while the anode connects to ground or return. Bidirectional variants use the "CA" suffix (e.g., SMCJ12CA).
Does the SMCJ12C meet automotive transient immunity standards?
Yes, the SMCJ12C meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (electrical fast transients). Its 1500 W peak power rating, sub-1.0 ps response time, and validated clamping behavior under standardized waveforms make it suitable for front-end protection in automotive ECUs, body controllers, and infotainment power supplies per AEC-Q200 recommendations.
What is the maximum steady-state power dissipation (PD) of the SMCJ12C at 25°C ambient?
The SMCJ12C has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C. This value reflects continuous DC power handling capability-not surge-related-and is limited by thermal resistance (RθJA = 55°C/W). In practice, the SMCJ12C is used only for transient suppression; sustained reverse bias above VWM is avoided, so PD is rarely a design constraint. The SMCJ12C remains safe under normal operating conditions with <1 μA leakage at 12 V.
Can the SMCJ12C be used in place of the SMCJ12A, and what is the key difference?
No, the SMCJ12C and SMCJ12A are not interchangeable without circuit review. The SMCJ12C has a VBR range of 13.3–16.3 V and VC = 22.0 V, while the SMCJ12A specifies VBR = 13.3–14.7 V and VC = 19.9 V. The tighter VBR tolerance and lower clamping voltage of the SMCJ12A suit applications demanding stricter voltage limiting, whereas the SMCJ12C offers higher surge margin. Always verify layout, thermal, and system-level clamping requirements before substitution.
SMCJ12C 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:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 22V
- Current - Peak Pulse (10/1000µs):
- 71A
- 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 (SMC)
SMCJ12C FAQ
1.How can I place an order for SMCJ12C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12C 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 SMCJ12C reliable?
The price and inventory of SMCJ12C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12C is usually 5 days.
3.What payment methods are accepted for SMCJ12C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12C?
SMCJ12C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12C 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 SMCJ12C?
For technical support, including SMCJ12C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12C requirements.
6.How does Aetrix verify that SMCJ12C is sourced from the original manufacturer or authorized distributors?
All SMCJ12C 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 SMCJ12C meets industry standards.
7.What is the process for return or replacement of SMCJ12C?
All SMCJ12C units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12C, 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 SMCJ12C part is unused and in its original packaging.
Return procedure for SMCJ12C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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