16 Mbit parallel NOR Flash — 70 ns access, 48-TFBGA
The Microchip SST39VF1601-70-4I-B3KE-T is a 16 Mbit parallel NOR Flash memory from the SST39 MPF series, organized as 1M x 16 bits. The parallel interface (full address/data bus) is a direct drop-in for legacy NOR Flash sockets, common in telecom line cards, industrial controllers, and boot firmware storage where SPI-attached Flash adds latency or requires a dedicated SPI controller.
The 70 ns access time matches the SST38VF6403B-70I/CD peer, so a board designed for that 64 Mbit part can use this 16 Mbit device with no timing re-spin — just address-range changes.
Write cycle time per word or page is 10 µs, typical for this generation of NOR Flash.
Lifecycle and sourcing
Microchip lists the SST39VF1601-70-4I-B3KE-T as Active (current production) with ROHS3 compliance. That means it can be designed into new BOMs without an immediate obsolescence clock. The SST38VF6403B-70I/CD (64 Mbit, same 70 ns speed, same 48-TFBGA footprint) is a higher-density sibling but not a pin-compatible second source — the address range differs. For dual-sourcing within the same density, the SST39VF1601 has no listed direct alternate from Microchip; sourcing through independent distribution gives access to multiple date-code and inventory lots.