16 Mbit parallel NOR flash for code-shadow and data-logging
The SST39VF1601-70-4I-EKE-T is a 16 Mbit parallel NOR flash from Microchip's SST39 MPF™ series, organized as 1M x 16 bits. Its 70 ns access time means the CPU can execute code directly from the flash without wait-states on most 16-bit bus controllers running below 14 MHz — useful for boot code or firmware shadowed into RAM at power-up.
Package and board-fit — 48-TSOP footprint
The surface-mount footprint matches legacy 48-pin TSOP layouts, so a board already routed for a 48-TSOP flash can take this part without a respin.
Write performance and firmware update strategy
Write cycle time is 10 µs per word or page — a full 16 Mbit firmware image at 1M words takes roughly 10 seconds to program in-page mode, assuming the controller meets the timing. This is fast enough for field-updatable firmware in networked equipment but slower than SPI NOR; the trade-off is the parallel interface's higher read throughput for code execution.
Active lifecycle and compliance posture
It is ROHS3 compliant, so it clears EU and UKCA regulatory gates without an exemption declaration.