A thin Sn coating was coated on the Cu electrodes on a printed circuit board (PCB) and annealed to form Cu/Sn intermetallic compounds (IMCs). Electrochemical migration (ECM) characteristics were investigated with respect to coating thickness, conductor spacing, and potential bias. From the anodic polarization test, the corrosion current of Cu/Sn IMCs was reduced to nearly two orders of magnitud…