The FS431S 431 is a 0.5% curate voltage reference manufactured by FOSAN, and is constructed in an SOT-23 package. It is RoHS compliant and has a tighter accuracy compared to higher resistance parts. With an adjustable range of 2.5V to 6.5V, it can serve as either a two-terminal input or a three-terminal output design, making it suitable for applications where a high precision and high stability reference is required for energy management, precision controls, testing and measurement, as well as medical and scientific equipment. Its low power consumption makes it a great choice for battery powered devices. It has an ultra-low temperature coefficient of 30ppm/°C and a high operating temperature range of -40°C to +125°C, making it highly reliable and appropriate for use in a wide variety of demanding conditions. With a maximum power dissipation of 200mW and a maximum power-off leakage of 40nA, it is designed for minimal power consumption and low operational stress.