The Arm Cortex-M139+ MCU is a microcontroller unit developed by Arm Holdings, a British semiconductor and software design company. Arm Holdings is headquartered in Cambridge, UK, and is known for its energy-efficient processor designs. The Cortex-M139+ MCU is part of Arm's Cortex-M series, which serves industries such as industrial automation, automotive, consumer electronics, and IoT. These MCUs are widely used in embedded systems for real-time control, sensor integration, and low-power applications. The Cortex-M139+ is designed for high-performance tasks, offering features like advanced security, enhanced processing power, and connectivity options.