Download the E28F400B5 datasheet PDF.
This datasheet also includes the E28F004B5 variant, as both parts are published together in a single manufacturer document.
E ADVANCE INFORMATION
SMART 5 BOOT BLOCK FLASH MEMORY FAMILY
2, 4, 8 MBIT 28F200B5, 28F400B5, 28F800B5, 28F004B5 n SmartVoltage Technology
Smart 5 Flash: 5 V Reads, 5 V or 12 V Writes
Increased.