Structure and method of packaging a semiconductor device

Details Structure and method of packaging a semiconductor device Structure and method of packaging a semiconductor device

1990-04-11

1992-04-21

Jackson, Jr., Jerome

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

357 72, 361400, 361402, H01L 2328, H01L 2944, H05K 702, H05K 116

Patent

active

051073250

ABSTRACT:
A semiconductor device comprises a semiconductor chip with an active surface having output bonding pads to which a plurality of conductive leads or finger contacts are attached via a TAB method and is packaged onto an insulating substrate having a pattern of conductors on its surface. The active surface of the semiconductor chip is initially coated with a first resin sealant comprising moldable resin agent containing a volatile solvent in the range of about 30% to 80% by volume, the solvent being soluble in the resin agent and having a volatility at a temperature below the thermosetting temperature of the resin agent. The semiconductor device is then mounted on the insulating substrate with the chip leads in aligned relation with at least some of the pattern conductors resulting in a cavity between the active circuit surface coated with the first resin sealant and the substrate surface. The mounted semiconductor device is then is encapsulated relative to its full peripheral extent with a second resin sealant comprising thermosetting epoxy resin having a viscosity permitting the filling of the cavity by capillary action while forming an environmentally impermeable coating. The method of packaging of this invention provides for a substrate mounted semiconductor device of reduced thickness and prevents deterioration due to continued thermal stress applied to the packaged structure during use resulting in finger lead cracking and moisture penetration into the packaged semiconductor device causing corrosive deterioration to that finger leads and their interconnects.

REFERENCES:
patent: 4631820 (1986-12-01), Harada et al.
patent: 4709254 (1987-11-01), Haghiri-Tehrani et al.
patent: 4943843 (1990-07-01), Okinaga et al.
patent: 5008733 (1991-04-01), Mine et al.

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