The STM32L412TBY6PTR is an STMicroelectronics STM32L4 series microcontroller built around an ARM Cortex-M4 core running at 80 MHz. The 32-bit single-core architecture with the Cortex-M4 FPU handles sensor fusion, motor control loops, or audio processing efficiently. The 128 KB Flash is enough for a real-time operating system plus application code, while the 40K x 8 SRAM supports moderate data buffering and stack depth. For designs that outgrow this memory footprint, the STM32L4 family offers density upgrades without changing the core peripheral set.
Industrial temperature range and connectivity
On the connectivity side, it brings I²C, SPI, Quad SPI, UART/USART, LINbus, IrDA, infrared, and USB — enough for sensor hubs, display interfaces, and serial bridges. The 30 GPIOs in the 36-WLCSP package constrain board routing, so plan the pin assignment early.
Package and assembly — 36-WLCSP
The small footprint saves board area but demands careful PCB layout: fine-pitch routing, via-in-pad capability, and a solder mask defined pad. Moisture sensitivity is MSL 1 typically for WLCSP, but verify the specific bake requirements from the reel label.
Lifecycle and sourcing posture
The base product number is STM32L412, so any PCN or EOL notification from ST will reference that base.