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Taiwan Semiconductor Corporation SMCJ18
- Part No.:
- SMCJ18
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ18.pdf
- Description:
- 1500W, 22.2V, 10%, UNIDIRECTIONA
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SMCJ18 from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) in DO-214AB (SMC) package, with 20V minimum breakdown voltage (VBR), 18V working stand-off voltage (VWM), and 32.2V maximum clamping voltage (VC) at 48A peak pulse current - designed for automotive load-dump and inductive switching protection in power supply rails.
For engineers reviewing the SMCJ18 datasheet, SMCJ18 pinout, SMCJ18 application, or SMCJ18 equivalent, key selection criteria include its 1500W peak pulse power rating, <1.0ps response time, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and unidirectional polarity marking - critical for robust ESD and surge immunity in 12V/24V embedded systems.
Technical Context
The SMCJ18 operates as a silicon avalanche diode with glass-passivated junction, delivering fast transient suppression via controlled avalanche breakdown. Its unidirectional configuration provides forward conduction only during overvoltage events on the cathode-biased side, while maintaining low leakage (<1µA at 18V) under normal operation.
Thermally, it features RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable 5W steady-state dissipation at 25°C ambient. It supports 200A non-repetitive forward surge (8.3ms half-sine) and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin above 12V nominal rail. |
| VBR (min/max) | 20.0 / 24.4 V @ 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC @ IPPM | 32.2 V @ 48 A - Clamped voltage during 10/1000µs surge; limits downstream IC stress to safe levels. |
| PPK | 1500 W - Peak pulse power handling per ISO 7637-2 Pulse 5a; sustains high-energy automotive load dump. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage preserves battery life and signal integrity in always-on circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
Pinout & Package
DO-214AB (SMC) surface-mount package with matte tin-plated leads, polarity indicated by cathode band. Weight: 0.210 g. UL 94V-0 compliant molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., 12V rail); conducts avalanche current to ground during overvoltage. |
| Anode | Reference/return path | Connected to system ground; completes clamping loop with minimal inductance for sub-nanosecond response. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress. |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance | Validated for automotive EMC immunity - protects CAN/LIN nodes, ECUs, and body control modules against conducted transients. |
| <1.0 ps response time | Clamps within picoseconds of transient onset, preventing voltage overshoot beyond VC in high-speed digital or analog signal paths. |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental regulations without compromising surge performance or thermal stability. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Suppressing load-dump spikes (up to 120V, 400ms) on 12V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and DC-DC input, clamping transients before they reach regulator ICs. Use Value: Limits peak voltage to ≤32.2V, protecting 36V-rated buck converters and microcontrollers without derating or oversized capacitors. | Use Scenario: Guarding 24V digital input channels of programmable logic controllers against inductive kickback from solenoid valves. IC Role / Device Role / Timing Role: Standoff device across input terminals, absorbing 1500W surges induced by relay coil de-energization. Use Value: Prevents false triggering and latch-up in optocouplers and level-shifter ICs by holding input voltage below 32.2V during 10/1000µs transients. |
| LED Driver Overvoltage Clamp | USB-C Power Delivery Line Protection |
Use Scenario: Safeguarding constant-current LED drivers in commercial lighting against lightning-induced surges on AC mains-derived DC bus. IC Role / Device Role / Timing Role: Primary clamping element on 18–24V output rail, coordinated with MOVs for multi-stage protection. Use Value: Maintains VWM = 18V margin above nominal output, ensuring no conduction during normal operation while clamping >30V transients. | Use Scenario: Protecting USB-C CC and VBUS lines in portable docking stations from ESD and hot-plug transients. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS path (after fuse), providing low-capacitance, low-leakage clamping aligned with USB PD 3.1 voltage profiles. Use Value: Delivers 32.2V clamping at 48A with <1µA leakage at 18V - preserving signal integrity and minimizing standby power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | Lower PPK = 600W; tighter VBR tolerance (20.0–22.1V); same DO-214AA package but smaller footprint. | Rated for lower-energy transients (e.g., IEC 61000-4-2 ESD only); not suitable for ISO 7637-2 Pulse 5a load dump. | Select SMCJ18 when 1500W capability and automotive-grade surge immunity are required; SMBJ18A fits space-constrained consumer designs. |
| 1.5KE18A | Through-hole TO-218 package; identical VWM/VBR/VC specs but higher RθJA (60°C/W); lead-free plating per J-STD-002. | Used where manual assembly or high-reliability through-hole mounting is mandated (e.g., aerospace avionics, military power supplies). | Choose 1.5KE18A for legacy board compatibility or thermal mass requirements; SMCJ18 preferred for automated SMT production and space efficiency. |
Compared with SMBJ18A and 1.5KE18A, the SMCJ18 uniquely balances 1500W surge capacity, DO-214AB surface-mount scalability, and ISO 7637-2 qualification - making it optimal for high-volume automotive and industrial power rail protection where both energy handling and manufacturability matter.
Availability
SMCJ18 is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC input conditioning, LED driver overvoltage clamp, and USB-C power delivery line protection requiring stable component supply and full traceability.
Supply support for SMCJ18 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 - headquartered in Hsinchu Science Park with global distribution.
The SMCJ series is part of TSC's high-power transient suppression product line, engineered specifically for automotive, industrial, and transportation systems demanding ISO 7637-2 and AEC-Q200-aligned reliability.
FAQ
What is the breakdown voltage range of the SMCJ18?
The SMCJ18 has a guaranteed breakdown voltage (VBR) range of 20.0 V to 24.4 V at 1 mA test current, measured per ANSI/IEEE C62.35. This range ensures consistent avalanche initiation across production lots and temperature extremes, directly supporting its use in 12V/24V automotive and industrial power rails where precise clamping threshold control is essential. The SMCJ18 maintains this specification under JEDEC-standard thermal and humidity conditions.
Is the SMCJ18 unidirectional or bidirectional?
The SMCJ18 is a unidirectional transient voltage suppressor, indicated by the absence of "C" or "CA" suffix and confirmed by its single-polarity marking (cathode band) and forward voltage specification (VF = 3.5 V at 100 A). It conducts only when the cathode is positive relative to the anode, making it suitable for DC rail protection where polarity is fixed - unlike bidirectional variants such as SMCJ18CA which protect AC or floating signals. This behavior is explicitly defined in the TSC S2104 datasheet.
What is the maximum clamping voltage of the SMCJ18 and at what current is it specified?
The SMCJ18 has a maximum clamping voltage (VC) of 32.2 V, specified at a peak pulse current (IPPM) of 48 A with a 10/1000 µs waveform per Fig.5 in the datasheet. This value represents the upper limit of voltage seen by downstream circuitry during worst-case surge events, enabling accurate overvoltage margining for ICs rated up to 36 V. The clamping performance is validated across -55°C to +150°C junction temperature range.
Does the SMCJ18 meet automotive EMC standards?
Yes, the SMCJ18 meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for electrical disturbances from conduction and coupling in automotive applications. Its 1500W peak pulse power rating, fast <1.0 ps response, and verified clamping behavior under standardized surge waveforms make it suitable for protecting ECUs, body control modules, and infotainment systems against real-world vehicle electrical noise - as documented in the TSC S2104 datasheet Section "Features".
What is the package type and thermal resistance of the SMCJ18?
The SMCJ18 uses the DO-214AB (SMC) surface-mount package with matte tin-plated leads, measuring 7.11 × 6.22 × 2.34 mm. Its thermal performance is characterized by a junction-to-ambient resistance (RθJA) of 55°C/W and junction-to-case resistance (RθJC) of 10°C/W, enabling 5W steady-state power dissipation at 25°C ambient. These values are measured per JEDEC JESD51-2 and support thermal design in compact PCB layouts with standard copper pour.
SMCJ18 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMCJ18 FAQ
1.How can I place an order for SMCJ18 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ18 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 SMCJ18 reliable?
The price and inventory of SMCJ18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ18 is usually 5 days.
3.What payment methods are accepted for SMCJ18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ18?
SMCJ18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ18 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 SMCJ18?
For technical support, including SMCJ18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ18 requirements.
6.How does Aetrix verify that SMCJ18 is sourced from the original manufacturer or authorized distributors?
All SMCJ18 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 SMCJ18 meets industry standards.
7.What is the process for return or replacement of SMCJ18?
All SMCJ18 units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ18, 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 SMCJ18 part is unused and in its original packaging.
Return procedure for SMCJ18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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