70 ns parallel NOR flash in a 48-ball BGA
The Microchip SST39VF400A-70-4C-B3KE is a 4 Mbit parallel NOR flash memory from the SST39 MPF series, organized as 256K x 16 bits.
70 ns access time. 20 µs write cycle time (word or page).
Commercial temp only — know the floor
No industrial or automotive suffix on this order code. If the system sees a cold start below freezing, the 70 ns access time may stretch and the write cycle may fail.
Active and ROHS3 — no LTB clock ticking
The SST39 MPF series has been around for years — the 70 ns speed grade and the 48-TFBGA package are mature, stable offerings.