Integrated shield for a no-lead semiconductor device package
View Patent ↗The present invention integrates a shield on a flat, no-lead (FN) semiconductor package, which has multiple rows of contact pads along any side. The FN semiconductor package will have at least one inner row and one outer row of contact pads on at least one side. The inner and outer rows of contact pads and a die attach pad form the foundation for the FN semiconductor package. A die is mounted on the die attach pad and connected by wirebonds to certain contact pads of the inner rows of contact pads. An overmold body is formed over the die, die attach pad, wirebonds, and inner row of contact pads, and substantially encompasses each contact pad of the outer row of contact pads. A conformal coating is applied over the overmold body, including the exposed surfaces of the contact pads of the outer row of contact pads, providing a shield.
1. A method for manufacturing a semiconductor device package comprising:
providing a lead frame comprising a die attach pad, an outside row of contact pads, and an inside row of contact pads between the die attach pad and the outside row of contact pads;
securing a die on the die attach pad;
forming a plurality of wire bonds coupling a plurality of bond pads on the die to a plurality of the inside row of contact pads;
forming an overmold body covering the die attach pad, the die, the wire bonds, and the inside row of contact pads to form a semiconductor device package having an upper portion and a bottom surface, wherein at least an exposed portion of the outside row of contact pads is not covered by the overmold body; and
forming a conformal coating substantially covering the upper portion of the semiconductor device package and in electrical contact with the exposed portion of at least a plurality of the outside row of contact pads.
2. The method of claim 1 wherein the die attach pad, the die, the wire bonds, the inside row of contact pads, and the outside row of contact pads are held together by the overmold body.
3. The method of claim 1 wherein a portion of the inside row of contact pads and a portion of the outside row of contact pads are exposed on the bottom surface of the semiconductor device package.
4. The method of claim 1 wherein the conformal coating is formed from a process comprising electroless plating to form a seed layer of conductive material over the upper portion of the semiconductor device package and in electrical contact with the exposed portion of at least a plurality of the outside row of contact pads, electrolytic plating to form a conductive layer on the seed layer, and electrolytic plating to form a metallic layer on the conductive layer.
5. The method of claim 1 wherein the conformal coating is formed from a process comprising spraying a conductive material over the upper portion of the semiconductor device package and in electrical contact with the exposed portion of at least a plurality of the outside row of contact pads.
6. The method of claim 1 wherein the upper portion comprises a top surface and at least one side surface of the semiconductor device package.
7. The method of claim 1 wherein the conformal coating is in contact with each of the outside row of contact pads.
8. The method of claim 1 wherein the conformal coating is in contact with a majority of the outside row of contact pads.
9. The method of claim 1 wherein the inside row of contact pads comprises a plurality of rows of contact pads.
10. The method of claim 1 wherein the conformal coating contacts a top surface of the outside row of contact pads.
11. The method of claim 1 wherein the conformal coating contacts an outer side surface of the outside row of contact pads.