Active production part — what you're getting
The MSP430FR5858IDA: It belongs to the MSP430 FRAM family, which replaces conventional Flash program memory with 48 KB of FRAM — non-volatile, fast-write, and effectively unlimited endurance compared to Flash.
Package and mounting
The 48 KB FRAM program memory is the headline feature here. Unlike Flash, FRAM writes at bus speed with no erase cycle needed. The 2 KB of SRAM handles the runtime stack and scratchpad.
I/O and peripheral complement
You get 31 general-purpose I/O pins in the 38-TSSOP package. On the peripheral side: a 12-channel 12-bit ADC, brown-out detect and POR for reliable power-up, a DMA controller for moving data without CPU intervention, PWM timers, and a watchdog timer.
Package and footprint
Housed in a 38-TSSOP package with 0.240" body width and 6.10 mm body width, surface-mount only. The supplier device package is 38-TSSOP.