The Arm Cortex-M103+ MCU is a microcontroller unit (MCU) based on the Arm Cortex-M1 core, designed by Arm Holdings, a British semiconductor and software design company. Arm Holdings, headquartered in the UK, licenses its processor designs to various manufacturers for use in embedded systems. The Cortex-M103+ MCU serves industries such as industrial automation, consumer electronics, and IoT, offering low-power, high-performance computing for applications like sensors, motor control, and edge devices. It is commonly integrated into products by third-party manufacturers rather than sold as a standalone brand.