48 MHz Cortex-M0 with 64 KB Flash — the BOM-fit tier
The onboard data converters give you a 12-bit ADC with 19 channels and a single 12-bit DAC. This is the part you reach for when a design needs an entry-level 32-bit core with a mature toolchain and a supply range that runs from 1.65 V up to 3.6 V — useful for single-cell battery or 1.8 V logic systems.
If your rework station doesn't handle sub-0.5 mm pitch BGA, budget for a stencil and pre-bake — the moisture sensitivity level isn't stated here, but any UFBGA below 0.65 mm pitch typically runs MSL 3, so a bake before reflow is cheap insurance if the bag seal is broken. The 54 I/O count in this footprint gives you a dense interconnect for a compact PCB, but the trade-off is that manual probing during debug requires a breakout adapter or a test point plan.
The 105°C ceiling gives you headroom above the standard 85°C industrial limit, which matters when the part sits near a power stage or inside a sealed enclosure with limited airflow.
The base product number is STM32F058, so any PCN or EOL communication for this density and package variant will reference that base.