32 KB Flash + 10 KB RAM — firmware footprint reality
The MSP430F5522IZQER: With 32 KB of Flash and 10 KB of RAM, this MCU fits firmware that includes a moderate USB stack, a few communication protocols, and application logic — but not a full RTOS with heavy graphics or file systems. The 10 KB RAM is shared between stack, heap, and data buffers; designs that need large circular buffers or multiple DMA descriptors should budget carefully. The Flash is field-reprogrammable, which supports firmware updates in the field if the bootloader fits within the remaining space.
80-BGA MICROSTAR JUNIOR — board-assembly constraints
The 80-ball VFBGA package measures 5×5 mm. This fine-pitch BGA requires X-ray inspection for voids and shorts.
Obsolete — last-time-buy sourcing only
Texas Instruments has marked the MSP430F5522IZQER as obsolete. No further factory orders are being accepted, and no official successor part number has been published for this specific package variant. The part is available through independent distribution on a last-time-buy or surplus basis, sourced and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time. For new designs, consider the active MSP430F5xx family members in LQFP packages, which offer similar peripheral sets and are easier to source.
Industrial temperature grade — field deployment envelope
Rated for -40°C to 85°C operating ambient. The internal oscillator and brown-out detect are specified across the full temperature range.