Browse Prior Art Database

Flat Package Using Three-Layer Film

IP.com Disclosure Number: IPCOM000034172D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Kodama, K: AUTHOR [+3]

Abstract

A flat package using a three-layer film is disclosed, which is effective to improve heat dissipation and increase I/O density. As shown in the figure, the three-layer film consists of an upper heat dissipative layer, such as copper, an intermediate insulating base layer, such as polyimide, and a lower conductive layer, such as copper. The conductive layer is patterned to provide leads. The IC chip is mounted on the lower surface of the heat dissipative layer through openings in the conductive layer and the base layer and wire-bonded to the leads. The chip is encapsulated by a plastic material. The base layer extends to the end of the leads to provide mechanical reinforcement and protection for the leads. This enables use of a thinner conductive layer for the leads and facilitates increasing the lead or I/O density.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Flat Package Using Three-Layer Film

A flat package using a three-layer film is disclosed, which is effective to improve heat dissipation and increase I/O density. As shown in the figure, the three-layer film consists of an upper heat dissipative layer, such as copper, an intermediate insulating base layer, such as polyimide, and a lower conductive layer, such as copper. The conductive layer is patterned to provide leads. The IC chip is mounted on the lower surface of the heat dissipative layer through openings in the conductive layer and the base layer and wire-bonded to the leads. The chip is encapsulated by a plastic material. The base layer extends to the end of the leads to provide mechanical reinforcement and protection for the leads. This enables use of a thinner conductive layer for the leads and facilitates increasing the lead or I/O density. The upper layer extends beyond the molded plastic to act as an effective heat dissipator.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]