The Microchip ATMEGA8L-8AU is an 8-bit AVR MCU from the ATmega family, clocked at 8 MHz.
Peripheral set and I/O count for a control board
Twenty-three general-purpose I/O lines break out from the 32-TQFP package, enough to handle a small keypad, a few LEDs, and a serial interface simultaneously.
Housed in a 32-TQFP (7x7 mm) with 0.8 mm pitch, the package is hand-solderable and rework-friendly. The exposed paddle is not present — all heat dissipates through the leads, so keep copper pours on the inner layers for thermal relief if the MCU drives a heavy peripheral load continuously.
Microchip lists the ATMEGA8L-8AU as Active. For dual-sourcing resilience, the pin-compatible ATmega8A-AU runs at up to 16 MHz and carries the same footprint — a drop-in alternative if the line needs a speed bump.