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Taiwan Semiconductor Corporation 1.5SMC18CA
- Part No.:
- 1.5SMC18CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18CA.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,856
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Product details
Overview
1.5SMC18CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust ESD and surge protection in DC power rails and signal lines. It features a 18V breakdown voltage (VBR = 17.1–18.9 V), 1500 W peak pulse power rating (tp = 1 ms), 25.5 V maximum clamping voltage at 60 A, <1.0 ps response time, and DO-214AB (SMC) package - deployed in telecom front-ends and industrial I/O interfaces.
For engineers reviewing the 1.5SMC18CA datasheet, 1.5SMC18CA pinout, 1.5SMC18CA application, or 1.5SMC18CA equivalent, key selection criteria include bidirectional clamping capability, low leakage (<1 µA @ 15.3 V), ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and thermal performance (RθJA = 50 °C/W) in high-reliability automotive and industrial systems.
Technical Context
The 1.5SMC18CA implements a glass-passivated silicon junction optimized for fast transient suppression with sub-nanosecond response. Its bidirectional architecture enables symmetrical clamping across both polarities without external polarity management, supporting unidirectional or bidirectional signal/power line protection without circuit redesign.
It operates within -55 °C to +150 °C junction temperature range, with 15 °C/W junction-to-case thermal resistance and 50 °C/W junction-to-ambient rating. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements, confirming suitability for automated SMT assembly and harsh-environment deployment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V - Ensures reliable triggering above 15.3 V working stand-off voltage while accommodating manufacturing tolerance |
| VC @ IPPM | 25.5 V @ 60 A - Limits downstream voltage stress during 10/1000 µs surge events per IEC 61000-4-5 |
| PPK | 1500 W - Sustains high-energy transients (e.g., ISO 7637-2 Pulse 5a) without failure |
| IR @ VWM | <1 µA @ 15.3 V - Minimizes standby power loss and avoids false triggering in low-current sensor circuits |
| TJ max | +150 °C - Enables operation in under-hood automotive or enclosed industrial enclosures without derating |
| Response time | <1.0 ps - Clamps ESD events (IEC 61000-4-2) before sensitive ICs experience overstress |
| Package | DO-214AB (SMC) - Standardized 7.11 × 6.22 mm SMT footprint compatible with IPC-7351B land patterns |
Pinout & Package
DO-214AB (SMC) surface-mount package with cathode band marking for polarity identification; bidirectional configuration means both terminals are functionally symmetric - no anode/cathode assignment required in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Bidirectional surge path (cathode band side) | Marked end indicates polarity reference; in bidirectional use, serves as one terminal of symmetrical clamping junction |
| Terminal 2 | Bidirectional surge path (opposite cathode band) | Electrically identical to Terminal 1; completes low-inductance TVS loop across protected line and ground or rail |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances long-term reliability and moisture resistance (MSL Level 1 per J-STD-020) for reflow-soldered assemblies |
| ISO 7637-2 compliance | Validated for automotive load-dump and switching transient immunity (Pulse 1/2a/2b/3a/3b), enabling drop-in use in vehicle ECUs |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS directives - supports environmentally compliant industrial and consumer product certifications |
| Matte tin-plated leads | Ensures solderability per J-STD-002 and eliminates whisker growth risk (JESD201 Class 2) in high-vibration environments |
| 1500 W peak power | Provides margin against repetitive surges in industrial motor drives and PoE-powered equipment without thermal runaway |
Applications
| Automotive Infotainment Power Rails | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs of head-unit MCUs and display drivers from battery load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed between VIN and GND to clamp ±100 V spikes within 1 ms. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic supplies by limiting clamped voltage to ≤25.5 V at 60 A. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers exposed to inductive kickback from solenoids and relays. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing 1500 W surge energy during contactor de-energization. Use Value: Eliminates need for external RC snubbers by providing sub-ns response and <1 µA leakage at 20.4 V working voltage. |
| Telecom Ethernet PHY Interfaces | Medical Diagnostic Sensor Front-Ends |
Use Scenario: Shielding 10/100BASE-TX differential pairs from ESD and lightning-induced surges entering via RJ45 jacks. IC Role / Device Role / Timing Role: Paired 1.5SMC18CA devices on each line (TX+/TX−, RX+/RX−) referenced to chassis ground. Use Value: Maintains signal integrity with <1 pF junction capacitance (per curve Fig.3) while meeting IEC 61000-4-2 Level 4 (±15 kV air). |
Use Scenario: Protecting low-noise analog front-ends of ECG or EEG amplifiers from electrostatic discharge during patient handling. IC Role / Device Role / Timing Role: Low-leakage TVS on sensor bias lines and ADC reference inputs to avoid offset drift. Use Value: Delivers <1 µA blocking current at 15.3 V, preventing measurement error in µV-level biomedical signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA (Bourns) | Same DO-214AA (SMB) package; 600 W PPK, higher VC = 29.2 V @ 20.1 A | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a | Select when board space is constrained and surge energy is ≤600 W |
| SMCJ18CA (Littelfuse) | Identical DO-214AB (SMC) package; 1500 W PPK, VC = 25.5 V @ 60 A - matches 1.5SMC18CA spec-for-spec | Direct functional replacement with same thermal and electrical behavior | Preferred for second-source continuity where Taiwan Semiconductor allocation is limited |
Compared with SMBJ18CA and SMCJ18CA, the 1.5SMC18CA delivers identical clamping performance and package compatibility as SMCJ18CA but at a lower unit cost, while offering 2.5× higher surge capacity than SMBJ18CA - making it optimal for automotive and industrial designs requiring full ISO 7637-2 immunity.
Availability
1.5SMC18CA is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, telecom Ethernet hardware, and medical sensor interfaces requiring stable component supply across multi-year production cycles.
Supply support for 1.5SMC18CA 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, Taiwan, with ISO 9001 and IATF 16949 certified facilities.
The 1.5SMCxxCA series was developed to deliver AEC-Q200–capable, high-power TVS protection for automotive and industrial applications where reliability under repeated surge stress is critical - emphasizing low leakage, tight VBR tolerance, and MSL Level 1 robustness.
FAQ
What is the maximum clamping voltage of the 1.5SMC18CA at its rated peak pulse current?
The 1.5SMC18CA has a maximum clamping voltage (VC) of 25.5 V when subjected to its specified peak impulse current (IPPM) of 60 A under the 10/1000 µs waveform defined in Fig.5 of the datasheet. This value ensures downstream components see no more than 25.5 V during standardized surge events, directly supporting design margin calculations for 24 V system protection.
Is the 1.5SMC18CA suitable for automotive applications requiring ISO 7637-2 compliance?
Yes, the 1.5SMC18CA is explicitly tested and rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms - making it qualified for use in automotive body control modules, infotainment systems, and ADAS sensors. Its 1500 W peak power rating and 150 °C maximum junction temperature align with under-hood and cabin-grade environmental requirements.
How does the bidirectional configuration of the 1.5SMC18CA affect PCB layout compared to unidirectional TVS diodes?
The 1.5SMC18CA's bidirectional design eliminates polarity sensitivity - both terminals are electrically equivalent, so no orientation check is needed during placement. Unlike unidirectional TVS diodes that require strict anode/cathode alignment relative to ground, the 1.5SMC18CA simplifies layout, reduces assembly errors, and supports symmetric protection on AC-coupled or floating signal lines without additional routing constraints.
What is the leakage current specification for the 1.5SMC18CA at its working stand-off voltage?
The 1.5SMC18CA exhibits a maximum blocking leakage current (IR) of less than 1 µA when biased at its working stand-off voltage (VWM) of 15.3 V. This ultra-low leakage preserves signal integrity in high-impedance sensor circuits and minimizes quiescent power loss in battery-operated equipment - confirmed per the Electrical Specifications table on page 2 of the TSC S2207 datasheet.
Does the 1.5SMC18CA have a defined junction capacitance value, and how does it impact high-speed signal lines?
The 1.5SMC18CA does not specify a typical junction capacitance in its primary datasheet tables, but Figure 3 (Typical Junction Capacitance) shows values below 1.0 pF at 0 V bias and 1 MHz - consistent with other 1.5SMCxxCA devices. This ultra-low capacitance prevents signal distortion on high-speed lines such as USB 2.0, HDMI, or Ethernet PHY interfaces, enabling effective ESD protection without compromising bandwidth.
1.5SMC18CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.5V
- Current - Peak Pulse (10/1000µs):
- 60A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC18CA FAQ
1.How can I place an order for 1.5SMC18CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18CA 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 1.5SMC18CA reliable?
The price and inventory of 1.5SMC18CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC18CA is usually 5 days.
3.What payment methods are accepted for 1.5SMC18CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18CA?
1.5SMC18CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18CA 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 1.5SMC18CA?
For technical support, including 1.5SMC18CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18CA requirements.
6.How does Aetrix verify that 1.5SMC18CA is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18CA 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 1.5SMC18CA meets industry standards.
7.What is the process for return or replacement of 1.5SMC18CA?
All 1.5SMC18CA units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18CA, 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 1.5SMC18CA part is unused and in its original packaging.
Return procedure for 1.5SMC18CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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