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Taiwan Semiconductor Corporation SMDJ18CA
- Part No.:
- SMDJ18CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ18CA.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,644
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Product details
Overview
SMDJ18CA from Taiwan Semiconductor is a bidirectional 3000W transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 18V working stand-off voltage (VWM), 20.0–22.1V breakdown voltage (VBR), and 29.2V maximum clamping voltage (VC) at 102.7A peak pulse current - designed for ESD and lightning surge protection in DC power rails and I/O interfaces.
For engineers reviewing the SMDJ18CA datasheet, SMDJ18CA pinout, SMDJ18CA application, or SMDJ18CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, 175°C junction rating, and DO-214AB mechanical compatibility with automated SMT assembly.
Technical Context
The SMDJ18CA implements a glass-passivated silicon avalanche junction optimized for high-energy transient suppression in automotive and industrial environments. It delivers symmetrical clamping in both polarities, supports 3000W peak pulse power (tp = 1ms), and maintains stable VBR across 1mA test current with ±5% tolerance.
Its thermal design features 15°C/W junction-to-lead resistance and operates over –55°C to +175°C junction temperature range. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - enabling robust reflow compatibility without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT=1mA | 20.0–22.1 V - Confirmed breakdown threshold ensuring reliable turn-on during transients |
| VC @ IPPM=102.7A | 29.2 V - Clamped voltage limiting downstream circuit stress under 3000W surge |
| PPK | 3000 W - Peak pulse power handling per 1ms waveform per Fig.5 |
| TJ max | +175 °C - Enables operation in under-hood automotive or high-ambient industrial enclosures |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 7.11 × 6.22 mm footprint and center cathode band |
Pinout & Package
DO-214AB (SMC) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band (bidirectional symmetry means band denotes terminal orientation, not unidirectional polarity).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (marked band) | Transient conduction path | Bidirectional terminals - either terminal serves as anode or cathode depending on transient polarity; no functional distinction in CA configuration |
| Leads (both) | PCB interconnect interface | Matte tin-plated, solderable per J-STD-002; supports reflow profiles up to 260°C peak |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive load-dump and inductive-switching transient immunity per OEM requirements |
| Sub-1ps response time | Clamps ESD events before sensitive ICs experience overstress - critical for USB, CAN, and sensor interfaces |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental mandates without compromising surge performance or thermal reliability |
Applications
| Automotive Power Rail Protection | Industrial Ethernet Port Protection |
|---|---|
Use Scenario: 12V battery line in body control module exposed to load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS clamp absorbing >3000W pulses while holding rail voltage below 30V. Use Value: Prevents MCU reset or regulator latch-up during ISO 7637-2 Pulse 5a events without derating or parallel devices. | Use Scenario: RJ45 PHY interface in programmable logic controller subjected to ESD and induced surges. IC Role / Device Role / Timing Role: Primary-level surge shunt protecting magnetics and PHY IC inputs/outputs. Use Value: Limits common-mode voltage excursion to <29.2V during 10/1000μs transients, preserving signal integrity and PHY latch-up margin. |
| Consumer USB-C Port Protection | Renewable Energy Inverter DC Link |
Use Scenario: VBUS and CC lines in USB-C receptacle facing contact ESD per IEC 61000-4-2 ±15kV air discharge. IC Role / Device Role / Timing Role: Fast-response bidirectional clamp placed upstream of ESD diode array. Use Value: Absorbs initial high-current ESD strike (≥102.7A) before secondary protection activates, reducing cumulative stress on downstream components. | Use Scenario: DC bus between PV array and MPPT converter subject to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary surge suppression stage after MOV primary, handling residual fast-rising transients. Use Value: Provides precise 29.2V clamping with low leakage (<1µA at 18V), minimizing standby power loss while maintaining high-energy absorption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC18CA (Littelfuse) | Same DO-214AB package; VBR = 20.0–22.2V, VC = 29.5V @ 102A - 0.3V higher clamping | Identical ISO 7637-2 coverage; slightly lower PPK (2500W vs. 3000W) | Preferred where tighter VBR tolerance (±5%) and legacy Littelfuse qualification are required |
| 1.5KE18CA (ON Semiconductor) | DO-201AD (Axial) package; same VWM/VBR/VC specs but 1.5kW PPK and higher RθJA (100°C/W) | Limited to low-density PCBs or through-hole designs; unsuitable for high-volume SMT | Select only when axial mounting is mandated or thermal budget allows higher junction rise |
Compared with SAC18CA and 1.5KE18CA, the SMDJ18CA offers superior 3000W surge capacity in a compact SMC footprint, lower thermal resistance (RθJL = 15°C/W), and full automotive-grade qualification - making it optimal for space-constrained, high-reliability DC power and interface protection.
Availability
SMDJ18CA is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial Ethernet gateways, and solar inverter DC link protection requiring stable component supply and long-term manufacturing continuity.
Supply support for SMDJ18CA 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, MOSFETs, and power management devices.
The SMDJ series was engineered specifically for high-power, surface-mount transient suppression in automotive and industrial environments - emphasizing ruggedness, AEC-Q200 readiness, and consistent parametric performance across temperature and life cycle.
FAQ
What is the maximum clamping voltage of the SMDJ18CA under rated surge conditions?
The SMDJ18CA exhibits a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current of 102.7 A (10/1000 μs waveform). This value is measured per standard test conditions defined in the datasheet and ensures downstream circuitry remains within safe operating limits during transient events.
Is the SMDJ18CA suitable for automotive applications requiring ISO 7637-2 compliance?
Yes, the SMDJ18CA is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test waveforms. Its 3000W peak power rating, fast sub-1ps response, and –55°C to +175°C operating range make it appropriate for engine control units, body electronics, and infotainment systems in passenger and commercial vehicles.
Does the SMDJ18CA have polarity markings, and how does that affect circuit layout?
The SMDJ18CA uses a DO-214AB package with a cathode band marking, but as a bidirectional device (CA suffix), this band indicates physical terminal orientation-not functional polarity. Layout requires symmetric placement with equal trace length and impedance to both terminals to preserve balanced clamping behavior during differential transients.
What is the steady-state power dissipation rating for the SMDJ18CA?
The SMDJ18CA has a steady-state power dissipation (PD) rating of 6.5 W at TA = 25°C. This value reflects continuous DC or low-frequency power handling capability and must be derated linearly above 25°C ambient using the specified thermal resistance (RθJA = 75°C/W) to avoid exceeding the 175°C maximum junction temperature.
How does the SMDJ18CA compare to unidirectional SMDJ18A in terms of electrical performance?
The SMDJ18CA and SMDJ18A share identical VWM (18 V), VBR (20.0–22.1 V), and VC (29.2 V) specifications, but the CA version provides symmetrical clamping in both directions, whereas the A version clamps only in reverse bias. This makes the SMDJ18CA ideal for AC-coupled or floating signal lines where polarity reversal may occur.
SMDJ18CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMDJ
- 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:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 102.7A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ18CA FAQ
1.How can I place an order for SMDJ18CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ18CA 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 SMDJ18CA reliable?
The price and inventory of SMDJ18CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ18CA is usually 5 days.
3.What payment methods are accepted for SMDJ18CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ18CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ18CA?
SMDJ18CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ18CA 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 SMDJ18CA?
For technical support, including SMDJ18CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ18CA requirements.
6.How does Aetrix verify that SMDJ18CA is sourced from the original manufacturer or authorized distributors?
All SMDJ18CA 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 SMDJ18CA meets industry standards.
7.What is the process for return or replacement of SMDJ18CA?
All SMDJ18CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ18CA, 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 SMDJ18CA part is unused and in its original packaging.
Return procedure for SMDJ18CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ18CA Tags
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