STM32F103RB的替代MCU型号咨询

是必须要ARM芯片吗？这个大部分MSP430也能满足您的需求，您可以在下面的链接筛选一下

www.ti.com/.../products.html

或者您可以具体说一下您的应用环境吗？

STM32F103RB资源如下：The STM32F103xx medium-density performance line family incorporates the high-performance ARM®Cortex®-M3 32-bit RISC core operating at a 72 MHz frequency, high-speed embedded memories (Flash memory up to 128 Kbytes and SRAM up to 20 Kbytes), and an extensive range of enhanced I/Os and peripherals connected to two APB buses. All devices offer two 12-bit ADCs, three general purpose 16-bit timers plus one PWM timer, as well as standard and advanced communication interfaces: up to two I2Cs and SPIs, three USARTs, an USB and a CAN.

楼主可以考虑下msp432，或者tiva系列的mcu

都能满足楼主的要求的

带CAN的话，选择TM4C123x系列的即可。