What this ultra-low-power MCU brings to a sensor-node BOM
The STM32L072CZU6: It runs at 32 MHz and packs 192 KB of Flash program memory, 20 KB of SRAM, and a useful 6 KB of embedded EEPROM — enough to store calibration tables or configuration parameters without an external serial EEPROM on the board. Package is a 48-pin UFQFN with exposed pad (7x7 mm), a compact footprint for space-constrained PCBs.
192 KB Flash and 6 KB EEPROM — firmware and data storage without external parts
The 192 KB of Flash (192K x 8) and 6 KB EEPROM store firmware and calibration data without external parts.
USB on board — direct PC connection for data logging and field updates
USB connectivity is part of the peripheral set, which means this MCU can present itself as a virtual COM port or a mass-storage device for drag-and-drop firmware updates. For a battery-powered data logger, that eliminates an external USB-to-UART bridge IC. The USB peripheral is a standard full-speed device, not OTG, so it works as a peripheral only — fine for a sensor node that talks to a host PC or a USB charger detector.
That means no last-time-buy clock is running, and the part is still in regular production at ST. The base product number is STM32L072, and the full STM32L0 series shares a common peripheral set and pinout across density options, so a migration to a larger Flash variant is straightforward if the firmware grows.
Sourcing posture for this order code
If you are filling a BOM line for a production run, send the quantity and target price band; we will source across our multi-supplier network and come back with a firm offer. For prototype quantities or a single reel, same process — just note the volume.