M95M04 4-Mbit serial EEPROMs STMicroelectronics M95M04 4-Mbit serial EEPROMs are organized as 524288 x 8 bits and are accessed through the SPI bus. These EEPROMs provide supply voltage range from 1.8V to 5.5V and guarantees over -40°C to 85°C operating temperature range. These serial EEPROMS offer 512-bytes of identification page and it can be used to store sensitive application parameters that can be permanently locked in read-only mode.