16 Mbit parallel NOR Flash on a 1.8 V rail
The Microchip SST39WF1601-70-4I-MAQE is a 16 Mbit parallel NOR Flash memory from the SST39 MPF™ family, organized as 1M x 16. It delivers a 70 ns access time and operates from a 1.65V to 1.95V supply, making it one of the few parallel NOR Flash parts that runs directly off a 1.8 V core logic rail without a separate regulator. The 40 µs word/page write cycle time suits firmware-update and parameter-storage tasks in embedded systems that need fast read but can tolerate moderate write speed. The package is lead-free and RoHS3 compliant per the listing.
1.65V–1.95V supply — the differentiator
Most 16 Mbit parallel NOR Flash parts, including Microchip's own SST39VF1601-70-4I-B3KE-T, require a 2.7V to 3.6V supply. The SST39WF1601-70-4I-MAQE runs from a 1.65V to 1.95V rail, which matches the 1.8 V core supply used in many low-power MCUs and SoCs. If your BOM already has a 1.8 V rail, this part saves a regulator and the associated board area. The trade-off is a slightly higher write-cycle time (40 µs versus 10 µs on the 2.7 V sibling), but for code shadowing and boot storage the read performance is identical at 70 ns.
Active, RoHS3, and no EOL concern
It is ROHS3 compliant.
BGA footprint and rework considerations
The 48-WFBGA (6x4 mm) package uses a fine-pitch ball array. Solder paste stencil aperture and reflow profile must be qualified for lead-free assembly. For rework, a hot-air nozzle matched to the 6x4 mm body and a preheat of 125°C will avoid thermal shock.