Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1982-04-13
1984-06-05
Hearn, Brian E.
Metal working
Method of mechanical manufacture
Assembling or joining
29576S, 29591, 26427217, 174 52PE, 174 52FP, 357 70, 428572, H01L 2156, H01L 2158
Patent
active
044519737
ABSTRACT:
A method for manufacturing a plastic encapsulated semiconductor device is provided which comprises the steps of: clamping by upper and lower molds at least external leads and strips of a semiconductor device assembly formed using a lead frame which has a first connecting band connected to the external leads extending from one side of a substrate support further used as a heat sink, and a second connecting band connected to the strips having portions of small cross-sectional areas and of a predetermined length and extending from the other side of the substrate support, the cross sections being perpendicular to an extending direction of the strips, so that the substrate support may float in a cavity formed by the upper and lower molds and parts of the portions of small cross-sectional areas may be disposed in the cavity and the remaining parts thereof may be disposed between the upper and lower molds; injecting a plastic into the cavity; and cutting the portions of small cross-sectional areas of the strips which extend outside a plastic encapsulating housing along the end face of the plastic encapsulating housing and cutting a connecting portion between the external leads and the first connecting band.
Also provided is a lead frame having the strips as described above.
A plastic layer of desired thickness can be formed on the rear surface of the substrate support. Cutting of the strips from the plastic encapsulating housing is easy and reliable.
REFERENCES:
patent: 3574815 (1971-04-01), Segerson
patent: 3716764 (1973-02-01), Birchler et al.
patent: 4003544 (1977-01-01), Bliven et al.
Fujii Hiroyuki
Katoh Michio
Nishikawa Mikio
Tateno Kenichi
Wada Fujio
Hearn Brian E.
Matsushita Electronics Corporation
Schiavelli Alan E.
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