Espressif has announced the ESP32-H21, a new low-power wireless SoC designed for Thread, Matter, Zigbee, and Bluetooth Low Energy devices. The company published the announcement on March 3, 2026, positioning the chip as an enhanced option for battery-sensitive IoT products. The main point of the ESP32-H21 is simple: it is an incremental update to the ESP32-H2 that adds an on-chip DC-DC converter to reduce active current consumption and improve battery life. That sounds like a small hardware change, but for always-connected sensors and low-power mesh nodes, it is exactly the sort of improvement that matters in the real world. Espressif…