Lead frame and semiconductor device made by using it

A lead frame comprising:

• a first elongated side frame;
• a second elongated side frame extending in parallel to the first elongated side frame;
• section bars connecting the first side frame and the second side frame at predetermined intervals for allowing the first side frame and the second side frame to be shifted relative to each other longitudinally thereof;
• a plurality of first lead terminals arranged at predetermined intervals and extending from the first side frame toward the second side frame, each first lead terminal including a base portion and an enlarged semiconductor-mounting free end portion;
• and
• a plurality of second lead terminals arranged in corresponding relationship to the plurality of first lead terminals and extending from the second side frame toward the first side frame, each second lead terminal including a base portion and a free end portion, the free end portion of each said second lead overlapping the free end portion of a corresponding first lead terminal when the first side frame and the second side frame are shifted relative to each other longitudinally thereof;
• wherein each said first lead terminal is formed with a weakening hole between the base portion and the free end portion of each said first lead terminal.

A lead frame comprising:

• a first elongated side frame;
• a second elongated side frame extending in parallel to the first elongated side frame;
• section bars connecting the first side frame and the second side frame at predetermined intervals for allowing the first side frame and the second side frame to be shifted relative to each other longitudinally thereof;
• a plurality of first lead terminals arranged at predetermined intervals and extending from the first side frame toward the second side frame, each first lead terminal including a base portion and an enlarged semiconductor-mounting free end portion;
• and
• a plurality of second lead terminals arranged in corresponding relationship to the plurality of first lead terminals and extending from the second side frame toward the first side frame, each second lead terminal including a base portion and a free end portion, the free end portion of each said second lead overlapping the free end portion of a corresponding first lead terminal when the first side frame and the second side frame are shifted relative to each other longitudinally thereof;
• wherein at least part of the free end portion of each said second lead terminal is considerably narrower than the base portion of each said second lead terminal.

A lead frame comprising:

• a first elongated side frame;
• a second elongated side frame extending in parallel to the first elongated side frame;
• section bars connecting the first side frame and the second side frame at predetermined intervals for allowing the first side frame and the second side frame to be shifted relative to each other longitudinally thereof;
• a plurality of first lead terminals arranged at predetermined intervals and extending from the first side frame toward the second side frame, each first lead terminal including a base portion and an enlarged semiconductor-mounting free end portion;
• and
• a plurality of second lead terminals arranged in corresponding relationship to the plurality of first lead terminals and extending from the second side frame toward the first side frame, each second lead terminal including a base portion and a free end extremity, only the free end extremity of each said second lead overlapping the free end portion of a corresponding first lead terminal when the first side frame and the second side frame are shifted relative to each other longitudinally thereof;
• wherein each said second lead terminal is formed with a weakening hole at a position other than the free end extremity.

A lead frame comprising:

• a first elongated side frame;
• a second elongated side frame extending in parallel to the first elongated side frame;
• section bars connecting the first side frame and the second side frame at predetermined intervals for allowing the first side frame and the second side frame to be shifted relative to each other longitudinally thereof;
• a plurality of first lead terminals arranged at predetermined intervals and extending from the first side frame toward the second side frame, each first lead terminal including a base portion and an enlarged semiconductor-mounting free end portion;
• and
• a plurality of second lead terminals arranged in corresponding relationship to the plurality of first lead terminals and extending from the second side frame toward the first side frame, each second lead terminal including a base portion and a free end portion, the free end portion of each said second lead overlapping the free end portion of a corresponding first lead terminal when the first side frame and the second side frame are shifted relative to each other longitudinally thereof;
• wherein at least two of the second lead terminals are connected to each other at their base portions by means of a connection bar extending in parallel to the second side frame, the connection bar being connected to the second side frame by means of a bridging member, the connection bar and the bridging member functioning as a weakening portion.