Electricity: conductors and insulators – Conduits – cables or conductors – Preformed panel circuit arrangement
Patent
1991-03-18
1992-10-06
Picard, Leo P.
Electricity: conductors and insulators
Conduits, cables or conductors
Preformed panel circuit arrangement
361402, 174256, 428901, H05K 100
Patent
active
051533855
ABSTRACT:
A transfer molded pad array chip carrier is formed by mounting and wirebonding a semiconductor device (12) on a printed circuit board (10). The bottom side of the printed circuit board may have an array of solderable surfaces (24). A polymer coating (18) is applied over the semiconductor device (12), the wirebonds (16), and the top side of the printed circuit board (10) and cured. The coating (18) is then sputter etched in a partial vacuum to enhance the adhesion of the transfer molding compound (20) to the printed circuit board (10). The semiconductor device is encapsulated by a transfer molding process. The polymer coating (18) also provides a barrier to alpha particle emission, improves the moisture resistance of the completed package and reduces stress at the surface of the device.
REFERENCES:
patent: 4064030 (1977-12-01), Nakai
patent: 4230754 (1980-10-01), Maher
patent: 4736012 (1988-04-01), Shoji et al.
patent: 4826720 (1989-05-01), Wade
patent: 4973645 (1990-11-01), Lee
patent: 4974057 (1990-11-01), Tazima
patent: 4999699 (1991-03-01), Christie et al.
Bernardoni Lonnie L.
Juskey Frank J.
Miles Barry M.
Swirbel Thomas J.
Dorinski Dale W.
Korka Trinidad
Motorola Inc.
Nichols Daniel K.
Picard Leo P.
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