Abstract:
Disclosed herein is a lead pin for a package substrate including a connection pin, and a head part including a flange part formed at one end of the connection pin and having one surface bonded to the connection pin and a flat part formed at the other surface of the flange part and having at least one groove formed along an outer circumference thereof. According to the present invention, the grooves are formed along the outer circumference of the flat part of the head part of the lead pin to increase a bonding area, thereby making it possible to increase bonding strength of the lead pin.