A new approach to the synthesis of a serial-to-parallel converter (SPC) based on the 0.25 μm GaAs D-mode pHEMT process is presented. Evolutionary algorithms application to solve SPC synthesis problem is shown. Solution, that have same structure as designer solution but with less power consumption, propagation delay and theoretically less total area is obtained. Its operability has been proved by comparison between simulated and measured data. Synthesis process takes up to 12 hours.