An electrical connector includes a seat having a signal contact receiving slot and a grounding contact receiving slot, and a signal contact and a grounding contact retained therein. For a serialized data transmission, the comparator receives the serialized transmission and a shift register serially coupled to the comparator to hold the data pattern. The alloy film for the metal separator for the fuel cell according to the invention is excellent in the corrosion resistance, has low contact resistance, can maintain the low contact resistance for a long time even in a corrosive environment, and is excellent further in the productivity.