STMicroelectronics has released the STM32WL3R, a sub-GHz wireless microcontroller designed specifically for remote control applications in consumer electronics and home automation.
Based on the STM32WL3 series, the STM32WL3R integrates a low-power RF transceiver and an Arm Cortex-M0+ core. It is the first multiband wireless MCU on Cortex-M0+ to support the 315 MHz frequency band used for remote controls in North America, alongside the 850 MHz and 950 MHz ISM bands for global compatibility.
The device features multiple power-saving states, including an ultra-deep stop mode that consumes 450 nA with 16 KB RAM retention and a shutdown mode drawing 14 nA. Six independent wake-up pins enable feature-rich remote designs while simplifying PCB layout and supporting design reuse across product variants.
Transmit current consumption is 10 mA at +10 dBm output power.
The STM32WL3R was co-developed with Somfy, a France-based building-automation company that specializes in motorized roller shutters, garage door openers, and connected home systems. Somfy has integrated the MCU into its next-generation RF remote controls and sensors.
The STM32WL3R is in production and available in a 5 mm × 5 mm QFN32 package. Pricing starts at $1.2654 for orders of 10,000 units.
