Looking for the biggest eeprom I can fit on an existing board - must be : 
5V (rules out ST serial flash unfortunately)
SO-8, 0.15"
Available ex-stock in small qtys  
Don't care about the speed or protocol (e.g. cs polarity) as long as the pinout is standard SPI
EEPROM

256kbit is easy, ST list a  512kbit (M95512) but doesn't appear to be available anywhere...
Am I stuck at 256kbytes, or does anyone know of anything bigger?

I may look to see if I can kludge an I2C part into the current pin assignments but there is other
SPI stuff on the same pins...


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