How do I obtain one? Cube isn't helpful -- this isn't a filter parameter. I need an MCU with built-in backup battery domain for the RTC. I don't want to build anything external and the design must not be capable of powering up the core from the battery, even by accident. The core must remain OFF for months at a time.
There's temporary shortage of some 'F0.
There's a great deal of compatibility across the whole 'F0 family, so you could perhaps start with https://www.mouser.com/Search/Refine?Keyword=STM32F051C8U and then move down to the 'F030 variants when they become available, hopefully soon.
'G0 may still be a novelty enough so that distributors don't have stock until somebody requests them. There are around 1500 various STM32 models at the market, not counting the extended-temperature and tape-and-reel variants as different models (but the distributors usually do count them as such).
JW
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