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Taiwan Semiconductor Corporation SMCJ18C
- Part No.:
- SMCJ18C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18C.pdf
- Description:
- 1500W, 22.2V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:6,569
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Product details
Overview
SMCJ18C from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 18V working stand-off voltage (VWM), 20V minimum breakdown voltage (VBR), and 29.2V maximum clamping voltage (VC) at 53A peak pulse current - designed for ESD and surge protection of automotive power lines and industrial I/O interfaces.
For engineers reviewing the SMCJ18C datasheet, SMCJ18C pinout, SMCJ18C application, or SMCJ18C 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 SMCJ18C is a unidirectional/bidirectional TVS diode configured as a single die in a glass-passivated junction, optimized for fast transient suppression in automotive and industrial environments. Its bidirectional operation (denoted by "C" suffix) enables symmetrical clamping in AC-coupled or floating signal paths without polarity constraints.
It meets ISO 7637-2 immunity requirements for automotive electronics, including Pulse 1 (inductive load dump simulation), Pulse 2a (battery disconnect), Pulse 2b (inductive switch-off), and Pulse 3a/3b (capacitive coupling transients). Thermal design leverages RθJC = 10°C/W to sustain 1500W peak pulse power under 1ms 10/1000μs waveform conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min) | 20 V @ IT = 1 mA - Guaranteed breakdown threshold ensures reliable turn-on during transients |
| VC @ IPPM | 29.2 V @ 53 A - Clamping voltage limits downstream IC stress during 1500W surge events |
| PPK | 1500 W - Peak pulse power rating per 1ms 10/1000μs waveform defines surge handling capacity |
| IR @ VWM | <1 µA - Ultra-low leakage preserves signal integrity and battery life in always-on systems |
| TJ max | +150 °C - Junction temperature limit supports operation in under-hood automotive environments |
| Response time | <1.0 ps - Enables suppression of nanosecond-scale ESD and fast transients before damage occurs |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, polarity marked by cathode band (not applicable for bidirectional SMCJ18C - symmetric terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bidirectional transient conduction path | Terminals are functionally identical; clamps voltage in either polarity above ±20V breakdown |
| Cathode band marking | Polarity indicator (absent on C-suffix) | SMCJ18C has no cathode band - confirms bidirectional construction per datasheet note |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Ensures stable VBR over lifetime and high reliability in humid or thermally cycled environments |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive power line immunity - eliminates need for additional external filtering in OEM designs |
| Moisture sensitivity level 1 (J-STD-020) | Enables standard SMT reflow without baking or special handling - reduces manufacturing cost and risk |
| RoHS and halogen-free (IEC 61249-2-21) | Meets global environmental compliance requirements for automotive and industrial end equipment |
| UL 94V-0 molding compound | Provides flame-retardant encapsulation essential for safety-critical automotive and industrial applications |
Applications
| Automotive Power Line Protection | Industrial I/O Port Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and microcontroller power rails against load dump and jump-start surges in 12V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between power rail and ground, responding within <1ps to suppress transients exceeding ±20V. Use Value: Limits voltage seen by downstream ICs to ≤29.2V during 53A surges, preventing latch-up or permanent damage per ISO 7637-2 Pulse 1/2a. | Use Scenario: Safeguarding PLC analog input channels and digital GPIOs from EFT and lightning-induced surges in factory automation systems. IC Role / Device Role / Timing Role: Front-end transient shunt on field-side signal lines, conducting >50A peak current while maintaining low clamping voltage. Use Value: Enables robust 2 kV EFT immunity (IEC 61000-4-4) and 1 kV surge immunity (IEC 61000-4-5) without sacrificing signal fidelity due to <1µA leakage. |
| LED Driver Overvoltage Protection | ESD-Sensitive Sensor Interface |
Use Scenario: Preventing catastrophic failure of constant-current LED drivers exposed to inductive switching spikes in streetlight or signage systems. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output terminals, clamping transients generated by relay or MOSFET switching. Use Value: Absorbs up to 1500W of energy in 1ms pulses, allowing use with high-inductance loads without derating or external snubbers. | Use Scenario: Shielding MEMS accelerometers and temperature sensors connected to long PCB traces or cables from human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF typical) bidirectional clamp placed directly at connector or sensor pad. Use Value: Sub-1ps response captures ESD rise times before propagation, while 29.2V clamping prevents gate oxide rupture in CMOS front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18CA | Lower peak power rating (400W vs. 1500W); same VWM/VBR/VC but lower IPPM (23.3A vs. 53A) | Suitable for low-energy ESD only; not rated for ISO 7637-2 Pulse 1 or load dump | Select SMCJ18C when protecting 12V automotive power rails or industrial 24V supplies requiring full 1500W surge handling. |
| 1.5KE18CA | Through-hole TO-218 package; identical electrical specs but higher RθJA (65°C/W vs. 55°C/W); no J-STD-020 MSL-1 rating | Requires manual assembly or wave soldering; unsuitable for automated SMT lines with moisture-sensitive handling | Choose SMCJ18C for high-volume SMT production where reflow compatibility, board space, and ISO 7637-2 compliance are mandatory. |
Compared with SMAJ18CA and 1.5KE18CA, the SMCJ18C delivers 3.75× higher surge power handling in an MSL-1 surface-mount package, enabling direct integration into automotive control units and industrial PLCs without layout or process compromises.
Availability
SMCJ18C is available at Aetrix Electronics and suitable for automotive power line protection, industrial I/O port hardening, LED driver overvoltage suppression, and ESD-sensitive sensor interface applications requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMCJ18C 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMCJ series was developed specifically for high-reliability transient suppression in harsh environments, emphasizing ISO 7637-2 compliance, low leakage, and robust SMT manufacturability in DO-214AB packaging.
FAQ
What does the "C" suffix in SMCJ18C indicate?
The "C" suffix in SMCJ18C denotes bidirectional configuration, meaning the device clamps transients equally in both polarities - unlike unidirectional "A" variants. This eliminates polarity concerns in AC-coupled or floating circuits and is confirmed by identical electrical specifications in both directions per the Taiwan Semiconductor datasheet.
Is SMCJ18C compliant with automotive EMI/EMC standards?
Yes, SMCJ18C meets ISO 7637-2 requirements for automotive transient immunity, including Pulse 1 (inductive load dump), Pulse 2a (battery disconnect), Pulse 2b (inductive switch-off), and Pulse 3a/3b (capacitive coupling). It is widely used in automotive body control modules and infotainment power supplies for this reason.
What is the maximum clamping voltage of SMCJ18C and at what current?
The maximum clamping voltage (VC) of SMCJ18C is 29.2 V, measured at 53 A peak impulse current (IPPM) under the standard 10/1000 μs waveform. This value is guaranteed across temperature and lifetime per the datasheet's Electrical Specifications table.
Can SMCJ18C be used in place of SMCJ18A?
No - SMCJ18C is bidirectional while SMCJ18A is unidirectional. Replacing SMCJ18A with SMCJ18C may cause unintended conduction in DC-biased circuits. The "C" variant lacks a cathode band marking and must be verified for polarity-insensitive layouts before substitution.
What is the thermal resistance of SMCJ18C and how does it affect PCB layout?
SMCJ18C has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case (RθJC) of 10°C/W. To maintain reliability under repeated surges, PCB land patterns should follow Taiwan Semiconductor's suggested pad layout with ≥25 mm² copper pour per terminal and thermal vias to inner ground planes.
SMCJ18C 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 48A
- 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)
SMCJ18C FAQ
1.How can I place an order for SMCJ18C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18C 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 SMCJ18C reliable?
The price and inventory of SMCJ18C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18C is usually 5 days.
3.What payment methods are accepted for SMCJ18C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18C?
SMCJ18C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18C 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 SMCJ18C?
For technical support, including SMCJ18C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18C requirements.
6.How does Aetrix verify that SMCJ18C is sourced from the original manufacturer or authorized distributors?
All SMCJ18C 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 SMCJ18C meets industry standards.
7.What is the process for return or replacement of SMCJ18C?
All SMCJ18C units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18C, 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 SMCJ18C part is unused and in its original packaging.
Return procedure for SMCJ18C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ18C Tags
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