64-LQFP — rework-friendly footprint
The STM32L433RCT6: Housed in a 64-LQFP (10x10 mm) with 0.5 mm pitch, this package is a rework tech's friend. The gull-wing leads are visible under magnification, so you can inspect every joint after reflow. No hot-air risk to adjacent passives — a standard fine-tip iron or hot-air pencil lifts the part cleanly if the board needs a swap.
ROHS3 compliant, so it passes European and global material restrictions without an exemption.
The MCU integrates a CANbus controller for industrial fieldbus, a USB full-speed device/host, Quad-SPI for high-speed serial Flash or RAM expansion, and an SAI audio interface.
How it compares to the STM32L151CBU6A
The STM32L151CBU6A is an earlier Cortex-M3 part from the STM32L1 series, running at 32 MHz with a similar peripheral set (I²C, SPI, UART, USB) and the same 12-bit ADC/DAC resolution. The L433RCT6 more than doubles the core clock to 80 MHz and adds a floating-point unit, which matters for DSP or sensor-fusion algorithms. The L151 has fewer I/O (37 vs 52) and lacks the QSPI and SAI interfaces. If your code fits within the 32 MHz budget and you don't need the FPU, the L151 is a cost-optimized alternative; for higher throughput or audio/display work, the L433 is the right pick.