> STM32 only recently [1] got on 90nm node! STM32G0 is value-oriented. The latest-and-greatest power efficiency STM32 is the STM32U5: https://www.st.com/conte

> STM32 only recently [1] got on 90nm node! STM32G0 is value-oriented. The latest-and-greatest power efficiency STM32 is the STM32U5: https://www.st.com/content/ccc/resource/sales_and_marketing/presentation/product_presentation/group1/99/af/38/36/04/39/4c/4b/microcontrollers_stm32u5_series_product_overview/files/Microcontrollers_STM32U5_Series_product_overview.pdf/jcr:content/translations/en.Microcontrollers_STM32U5_Series_product_overview.pdf https://www.st.com/content/ccc/resource/sales_and_marketing/... Which seems to be 40nm. I'm not 100% sure if the STM32U5 is the smallest node they're using. But 40nm (or better) seems like a safe bet these days.