Electrophoretic coating methodology to improve internal package

Details Electrophoretic coating methodology to improve internal package Electrophoretic coating methodology to improve internal package

1997-12-08

2000-04-04

Monin, Jr., Donald L.

Active solid-state devices (e.g., transistors, solid-state diode

Encapsulated

With specified encapsulant

257787, 438124, 438126, 438127, H01L 2348

Patent

active

060465077

ABSTRACT:
Method for implementing a multi-phase plastic package for electronic components, and packaged electronic components produced according to the method. The principles of the present invention contemplate electrostatically depositing an exceptionally uniform coating on electronic components, especially microchips, and more especially still, on integrated circuits prior to the encapsulation of the electronic components into plastic-packaged components. The coating, for instance applied to a completed leadframe assembly, including die and wire bonds, serves two purposes. It improves adhesion of the molding compound forming the package, thereby reducing the chances for delamination of the package. The coating also isolates the relatively fragile wire bonds, including their attachment points to the chip and the bonding pads and the leads, from chemical and metallurgical attack by the flame retardant found in many molding compounds.

REFERENCES:
patent: 4486945 (1984-12-01), Aigoo
patent: 5208467 (1993-05-01), Yamazaki
patent: 5276351 (1994-01-01), Yamazaki et al.
patent: 5656830 (1997-08-01), Zechman
Robert Kessel, "Taking a Look at a New Topcoat Technology", Home Lighting & Accessories, Clifton, NJ, (printing date unknown).
Jonathan Holland and Robert Berger, Ph.D., "Electrophoretic Deposition: A New Answer to Old Questions", Plating and Surface Finishing, Aug. 1993.
PF Special New Product Report, "Water-Borne Topcoat for Heavy Builds", Product Finishing, Jun. 1994, pp. 136, 156, and 165.
Clearlyte.RTM. HB, Water-Based, Electrophoretic Topcoat For Heavy Build Applications, Enthone-OMI.
UDYLITE.RTM. Technical Data Sheet, .COPYRGT. 1994, Enthone-OMI Inc., pp. 1-12 (minus p. 11, which is a page for taking notes).

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