The STMicroelectronics STM32L051T6Y6TR is a 32-bit ARM Cortex-M0+ MCU from the STM32L0 ultra-low-power series, clocked at 32 MHz with 32KB Flash, 8KB RAM, and 2KB EEPROM on-chip. It packs 29 I/O lines, a 10-channel 12-bit ADC, and serial connectivity including I²C, SPI, and UART/USART into a 36-ball WLCSP package. The supply range from 1.65 V to 3.6 V makes it a fit for single-cell battery applications, and the −40°C to 85°C temperature grade covers most industrial and consumer environments.
Ultra-low-power architecture and peripherals
Sourcing and lifecycle reality
The official product status is listed as Active, though some channel signals flag end-of-life monitoring. This part is sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — the buyer should not assume unrestricted factory supply without a confirmed allocation. No official successor or pin-compatible second source is listed in the record, so a BOM freeze or last-time-buy scenario would require a design-in evaluation of other STM32L0 density variants.
32 MHz — what it means for the BOM
The 32 MHz core speed is the ceiling for this Cortex-M0+ — it is not a high-throughput part for DSP or heavy protocol stacks. It handles sensor polling, simple control loops, and serial bridge tasks comfortably. The 8KB RAM limits buffer-heavy applications; the 2KB EEPROM is useful for calibration constants or boot parameters that survive a firmware update.