24 MHz Cortex-M3 — value-line control, not performance-tier
The 48-LQFP package gives 37 I/O, and the on-chip peripherals include DMA, a temperature sensor, and a full set of watchdog and reset functions (PDR, POR, PVD, WDT). The 24 MHz ceiling is the key BOM differentiator: this is the cost-optimised tier, not the 72 MHz STM32F103 performance line. If your application needs higher throughput or larger memory, you are looking at the wrong part.
STMicroelectronics lists the STM32F100C8T6B as Active. The part is ROHS3 compliant. The datasheet PDF is available from the manufacturer's website.