The MSP430FG439IPN: The MSP430 CPU16 core runs at 8 MHz, keeping dynamic current low for battery-powered designs.
Active, not end-of-life — no LTB pressure
That means no last-time-buy deadline looming, no scramble for a pin-compatible swap mid-production. It is also ROHS3 compliant, so no lead-free exemption paperwork to manage.
Package and footprint — 80-LQFP
Hand-solderable with a decent iron and flux, but reflow is cleaner. The 48 general-purpose I/O give you room for a parallel LCD bus, a row of buttons, and a few sensor interrupts without multiplexing. Surface-mount only — no through-hole option, so plan the PCB accordingly.