SM4T18CAY

SM4T18CAY is a transient voltage suppressor (TVS) diode manufactured by STMicroelectronics, designed for robust protection against electrostatic discharge (ESD) and transient overvoltages in electronic systems. It features a unidirectional configuration with a breakdown voltage of 18 V, making it suitable for low-voltage signal lines and sensitive circuitry. The device offers a peak pulse current capability of up to 60 A (10/1000 μs), ensuring effective clamping of high-energy transients without degradation in performance. This TVS diode exhibits a fast response time of less than 1 picosecond, enabling rapid suppression of voltage spikes that could otherwise damage integrated circuits or microcontrollers. Its low reverse leakage current—typically less than 1 μA at 18 V—minimizes power loss and maintains system efficiency. Additionally, the SM4T18CAY has a compact DO-214AA (SMA) package, facilitating easy surface-mount assembly and integration into space-constrained designs. The component is optimized for use in automotive, industrial, and consumer electronics applications where reliability under harsh electrical conditions is critical. It complies with AEC-Q101 standards, confirming its suitability for automotive environments subjected to temperature extremes, vibration, and electromagnetic interference. Common applications include USB ports, data lines, sensor interfaces, and communication modules in vehicles, home appliances, and IoT devices. Engineered for compliance with international safety regulations such as IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT), the SM4T18CAY ensures consistent performance across diverse operating conditions. Its reliable clamp voltage of approximately 27 V under maximum pulse current provides sufficient margin to protect downstream components from overvoltage events while maintaining signal integrity. Furthermore, the device supports operation across a wide temperature range—from -55°C to +150°C—making it ideal for both indoor and outdoor deployments. With its combination of high-speed response, low capacitance (~1.5 pF), and excellent thermal stability, the SM4T18CAY delivers dependable protection for digital and analog signals in modern electronic systems. Its design simplifies PCB layout and enhances overall system resilience against electrical overstress, making it a preferred choice for engineers seeking efficient, cost-effective ESD protection solutions.