Lead frame

A lead frame, comprising:

• a plurality of unit lead frames arranged in a matrix;
• a plurality of leads aligned along sides of each of the plurality of unit lead frames, a rear surface of the leads being exposed;
• a connecting bar via which the leads of adjacent ones of the plurality of unit lead frames are connected, the connecting bar including a longitudinal connecting bar, a transverse connecting bar and a crossing part at which the longitudinal connecting bar and the transverse connecting bar are crossed;
• a dicing part including the connecting bar and a part of the leads, to be cut along a dicing line;
• a half-etching part formed along the dicing part, and being smaller in width than the dicing part;
• and
• a strength retention part formed in the half-etching part and extended from the crossing part of the connecting bar at least to an end lead located closest to the crossing part among the leads of the unit lead frame adjacent to the crossing part.