4 Mbit (512K x8) SuperFlash EEPROM SST28SF040A / S.
Silicon Storage Technology
SST28VF040A - (SST28xF040A) 4 Mbit (512K x8) SuperFlash EEPROM
4 Mbit (512K x8) SuperFlash EEPROM SST28SF040A / SST28VF040A SST28SF040A / SST28VF040A5.0 & 2.7 4Mb (x8) Byte-Program, Small Erase Sector flash memori.