The ATUC64L4U-D3HR is a 32-bit AVR32 UC3 L microcontroller from Microchip, clocked at 50 MHz with 64 KB of on-chip Flash and 16 KB of SRAM. It is built for low-power, real-time embedded control — the AVR32 single-cycle core delivers deterministic instruction execution, which matters when the interrupt latency budget is tight. The 50 MHz ceiling is the practical limit for the USB full-speed peripheral (12 Mbps) and the 8-channel 12-bit ADC; the DMA controller offloads data movement so the core can stay in sleep longer between events.
48-TLLGA — footprint and assembly notes
No hand-solder rework without hot-air station and flux.
For a BOM that needs this exact package and memory density, the supply channel is standard distribution — no surplus-broker dependency.