STMicroelectronics Buck 4A 18V 850kHz Step-Down DC-DC Converter IC ST1S40IDR

4A DC-DC Step-Down Regulator, 18V, 850kHz, SOIC Product overview: ST1S40IDR from STMicroelectronics is a Step-Down DC-DC Converter IC for stable power rails, DC-DC conversion, battery-powered electronics, automotive modules, and embedded power management. It is useful for engineers and buyers comparing datasheets, replacement parts, BOM lines, package options, lifecycle status, and procurement availability. Key searchable attributes include Buck, 4A, 18V, 850kHz, SOIC. Search-friendly keywords include voltage regulator, LDO, buck converter, boost converter, power rail, Buck, 4A, 18V, 850kHz, Step-Down DC-DC Converter IC. This listing supports clearer product discovery for industrial, commercial, repair, automation, power, sensing, and embedded system projects. Product number 739-ST1S40IDR can be used for catalog matching and distributor lookup.