FRAM memory: what it changes for your firmware strategy
Its headline feature is 16 KB of FRAM program memory — a non-volatile storage technology that writes at bus speed, consumes microamps in standby, and endures over 10^15 write cycles. That means you can treat FRAM like RAM that doesn't forget: no separate EEPROM for calibration constants, no flash-page erase delays during firmware updates, and no wear-leveling code. The 1K x 8 SRAM handles stack and scratchpad data.
Supply range and I/O — 5 V tolerance check
It is not a 5 V-tolerant part — the absolute maximum on any I/O pin tracks the supply rail. If your design uses 5 V sensors or logic, you will need level translation or a separate 3.3 V domain. The 17 I/O lines include the usual MSP430 peripheral mux options: UART, SPI, I²C, IrDA, LIN, and SCI, all on the same flexible pin assignments.
Package and thermal — 24-VQFN with exposed pad
Housed in a 24-VFQFN with exposed pad (4x4 mm body), the MSP430FR5736IRGET is a surface-mount part intended for reflow soldering. Without a proper via stitch under the pad, junction temperature can rise significantly above ambient when running continuous 24 MHz operation near the 85°C ceiling.