Method of producing epoxy resin-encapsulated semiconductor devic

Details Method of producing epoxy resin-encapsulated semiconductor devic Method of producing epoxy resin-encapsulated semiconductor devic

1996-07-22

1997-09-30

Picardat, Kevin

Fishing, trapping, and vermin destroying

437209, 437212, H01L 2160

Patent

active

056725493

ABSTRACT:
In a method of producing a resin-encapsulated semiconductor device, a lead frame having an semiconductor element bonded thereto and wire-bonded thereto is set as an insert into an injection mold. An epoxy resin molding compound is injected into the mold by an injection molding. In this method, an injection pressure of the injection molding machine is gradually increased in such a manner that a maximum pressure of 30 kg/cm.sup.2 to 300 kg/cm.sup.2 is achieved at the time when 80% to 95% of a total amount of the epoxy resin molding compound to be injected is injected into the mold. Subsequently, the remaining epoxy resin molding compound is injected into the mold at an injection pressure of 20 kg/cm.sup.2 to 100 kg/cm.sup.2. A heating cylinder of the injection molding machine is divided into a plurality of zones which are controlled in the temperature independently. The zone nearest to a nozzle of the heating cylinder is controlled to 65.degree. C.-110.degree. C. while that zone nearest to a hopper of the heating cylinder is controlled to the ordinary temperature to 50.degree. C.

REFERENCES:
patent: 5091341 (1992-02-01), Asada et al.
patent: 5179039 (1993-01-01), Ishida et al.
patent: 5367766 (1994-11-01), Burns et al.
patent: 5427938 (1995-06-01), Matsumura et al.
patent: 5474958 (1995-12-01), Djennas et al.
patent: 5525547 (1996-06-01), Matsunaga et al.

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