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Taiwan Semiconductor Corporation 1.5SMC18C
- Part No.:
- 1.5SMC18C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18C.pdf
- Description:
- 1500W, 18V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,392
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Product details
Overview
1.5SMC18C from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode with a nominal breakdown voltage of 18V, clamping voltage of 26.5V at 59A peak pulse current, and working stand-off voltage of 14.5V - designed to protect power rails and I/O lines in telecom front-ends against ESD, lightning-induced surges, and load-switching transients.
For engineers reviewing the 1.5SMC18C datasheet, 1.5SMC18C pinout, 1.5SMC18C application, or 1.5SMC18C equivalent, this device delivers sub-1ps response time, <1μA leakage above 10V, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and DO-214AB (SMC) package compatibility for high-reliability automotive and industrial power interface protection.
Technical Context
The 1.5SMC18C operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast transient suppression with minimal capacitance. Its clamping behavior is defined by a 10/1000μs waveform per REA standards, delivering 26.5V max clamping voltage at 59A IPPM under 1ms pulse conditions.
Thermal performance is characterized by RθJA = 50°C/W and RθJC = 15°C/W, enabling sustained operation up to +150°C junction temperature. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, supporting lead-free reflow assembly without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 16.2V / 19.8V @ 1mA test current - defines reliable avalanche initiation range for consistent overvoltage triggering |
| VWM | 14.5V - maximum continuous DC or RMS operating voltage before leakage exceeds 1μA |
| VC @ IPPM | 26.5V @ 59A - peak clamped voltage during 10/1000μs surge, limiting downstream IC stress |
| PPK | 1500W - peak pulse power handling capability per single 1ms transient event |
| IR @ VWM | <1μA - ultra-low leakage ensures minimal standby power loss in battery-backed systems |
| TJ max | +150°C - enables deployment in under-hood automotive modules and industrial motor drives |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with 0.210g mass and UL 94V-0 molding compound |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, cathode band marking polarity, and 0.210g typical weight. Compliant with J-STD-002 solderability and JESD201 Class 2 whisker testing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected line (e.g., 12V rail or RS-485 A/B); conducts during reverse-biased surge |
| Cathode | Ground/Reference side terminal | Connected to system ground or low-impedance return path; establishes unidirectional clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche characteristics over 1000+ surge events without parameter drift |
| <1.0ps response time | Clamps transients before sensitive logic or analog circuitry experiences damaging overvoltage |
| ISO 7637-2 compliance | Validated for automotive load-dump and alternator-spike immunity (Pulse 1/2a/2b/3a/3b) |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing and end-of-life processing |
| MSL Level 1 | Zero floor life limitation - can be mounted directly after unpacking without baking or dry-pack requirements |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12V supply inputs in body control modules against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery feed and LDO input to limit voltage excursions to ≤26.5V. Use Value: Prevents latch-up or permanent damage to 3.3V/5V regulators during 120V/500ms load-dump events per ISO 7637-2 Pulse 5a. |
Use Scenario: Shielding 24V digital input channels on programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Front-end transient suppressor on optocoupler input side, shunting surge energy to chassis ground. Use Value: Maintains signal integrity during 4kV EFT bursts (IEC 61000-4-4) while adding <0.5pF parasitic capacitance to the sensing node. |
| Telecom Line Interface | Consumer USB Power Delivery |
Use Scenario: Safeguarding Ethernet PHY power pins (3.3V/5V) in PoE-powered switches from induced lightning surges. IC Role / Device Role / Timing Role: Secondary-level TVS on DC-DC converter output, coordinated with primary MOV and gas discharge tube. Use Value: Clamps common-mode transients to <30V within 1ps, preventing PHY reset or PHY register corruption during 1kV/0.5μs surges. |
Use Scenario: Overvoltage protection on VBUS line of USB-C receptacles exposed to hot-plug and adapter fault conditions. IC Role / Device Role / Timing Role: Fast-response clamp between VBUS and GND, sized to absorb 1500W peak without thermal runaway. Use Value: Limits VBUS to 26.5V during 20V adapter short-circuit faults, protecting USB PD controller and port power switches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A (Bourns) | Same DO-214AA (SMB) package; 600W rating; 28.2V clamping at 21.2A - lower power handling and higher clamping voltage | Not suitable for ISO 7637-2 Pulse 5a; limited to lower-energy transients in consumer-grade interfaces | Select when board space constraints require SMB footprint and surge energy is ≤600W |
| 1.5KE18C (ON Semiconductor) | Through-hole DO-201 package; identical 1500W rating and 26.5V clamping; slower thermal response due to larger junction-to-ambient resistance | Requires wave soldering or hand assembly; unsuitable for fully SMT production lines | Select only for legacy through-hole designs where rework tolerance and manual repair access are prioritized |
Compared with SMBJ18A and 1.5KE18C, the 1.5SMC18C provides optimal balance of high-power surge immunity, surface-mount manufacturability, and automotive-grade reliability - making it the preferred choice for new SMT-based 12V/24V system designs requiring ISO 7637-2 compliance.
Availability
1.5SMC18C is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, telecom line interface, and consumer USB power delivery applications requiring stable component supply across multi-year production cycles.
Supply support for 1.5SMC18C 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 since 1979.
The 1.5SMC series was developed specifically for high-reliability surface-mount surge protection in automotive, industrial, and telecom infrastructure - emphasizing robustness, repeatability, and compliance with international transient immunity standards.
FAQ
What is the polarity configuration of the 1.5SMC18C?
The 1.5SMC18C is a unidirectional TVS diode with cathode-band marking indicating the cathode terminal. It functions as a reverse-biased avalanche clamp - conducting only when the anode is driven negative relative to the cathode. This configuration protects positive-rail circuits such as 12V or 24V power supplies from overvoltage events while blocking normal forward conduction.
Does the 1.5SMC18C meet automotive transient immunity standards?
Yes, the 1.5SMC18C meets ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupling), and Pulse 3b (ground noise) requirements. Its 1500W peak power rating and 26.5V clamping voltage enable robust protection against real-world automotive electrical disturbances without derating.
What is the maximum junction temperature rating for the 1.5SMC18C?
The 1.5SMC18C has a maximum junction temperature (TJ) rating of +150°C, verified per absolute maximum ratings in the official Taiwan Semiconductor datasheet. This allows operation in under-hood environments, industrial motor drive cabinets, and other high-ambient-temperature applications when mounted on thermally adequate PCB copper areas.
How does the 1.5SMC18C differ from the 1.5SMC18CA variant?
The 1.5SMC18C is unidirectional, whereas the 1.5SMC18CA is bidirectional - meaning the CA version clamps in both polarities and lacks polarity marking. The 1.5SMC18C offers tighter VBR tolerance (16.2–19.8V vs. 17.1–18.9V for 1.5SMC18A) and is intended for DC rail protection, while the CA variant suits AC-coupled or differential signal lines like RS-485 or CAN bus.
Is the 1.5SMC18C compatible with lead-free reflow soldering processes?
Yes, the 1.5SMC18C is qualified for lead-free reflow per J-STD-020, with Moisture Sensitivity Level 1 - meaning it may be assembled directly from tape-and-reel packaging without baking. Its matte tin-plated leads comply with J-STD-002 solderability requirements and withstand peak reflow temperatures up to 260°C for 10 seconds.
1.5SMC18C 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):
- 14.5V
- Voltage - Breakdown (Min):
- 16.2V
- Voltage - Clamping (Max) @ Ipp:
- 26.5V
- Current - Peak Pulse (10/1000µs):
- 59A
- 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)
1.5SMC18C FAQ
1.How can I place an order for 1.5SMC18C through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18C 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 1.5SMC18C reliable?
The price and inventory of 1.5SMC18C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC18C is usually 5 days.
3.What payment methods are accepted for 1.5SMC18C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18C?
1.5SMC18C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18C 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 1.5SMC18C?
For technical support, including 1.5SMC18C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18C requirements.
6.How does Aetrix verify that 1.5SMC18C is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18C 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 1.5SMC18C meets industry standards.
7.What is the process for return or replacement of 1.5SMC18C?
All 1.5SMC18C units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18C, 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 1.5SMC18C part is unused and in its original packaging.
Return procedure for 1.5SMC18C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC18C Tags
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