The SST39SF010A / SST39SF020A / SST39SF040 are CMOS Multi-Purpose Flash （MPF） devices manufactured with SST proprietary， high performance CMOS SuperFlash technology. The split-gate cell design and thick oxide tunneling injector attain better reliability and manufacturability compared with alternate approaches. The SST39SF010A / SST39SF020A / SST39SF040 write （Program or Erase） with a 4.5-5.5V power supply， and conforms to JEDEC standard pinouts for x8 memories. This document provides supplemental information about the 45 ns SST39SF010A / SST39SF020A / SST39SF040 parts which are End-of-Life （EOL）。 Except for the information provided herein， the 45 ns parts behave as described in the SST39SF010A / SST39SF020A / SST39SF040 data sheet DS- 25002. See page 3 for specific part numbers..