TES 3-4811WI 3WI 3W Isolated DC-DC Converter Surface Mount, Voltage in 18 → 75 V dc. 3W SMD single/dual output regulated isolated high performance DC-DC converter modules with a compact low profile SMD package and a wide 4:1 input voltage range. These high performance DC-DC converter modules have a high efficiency and allow an operating temperature range of up to -40°C to +71°C at full load.