The BY25D40ASOIG(T) is a 4M SPI TSSOP-8 RoHS Flash Memory chip manufactured by BOYAMICRO. It can be used in a variety of applications, from storage, to boot code loading, to accessing large amounts of data in a short amount of time. It features an endurance of 100000 program/erase cycles, a static data retention of 10 years, and is compliant with the JEDEC standard. The chip is RoHS compliant, meaning that it does not contain any hazardous materials. It is also backed with a comprehensive warranty from the manufacturer.