Systems having advanced pre-formed planar structures

Details Systems having advanced pre-formed planar structures Systems having advanced pre-formed planar structures

1995-12-29

1998-06-23

Thomas, Tom

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

Housing or package

With contact or lead

257774, 257778, 257786, H01L 2304

Patent

active

057708894

ABSTRACT:
An electronic system utilizing at least one semiconductor die having raised conductive bumps on its surface for connecting to other devices or systems is disposed on a face of a preformed planar structure (interposer) having through holes. Solder joints with conductive bumps on an underlying substrate are formed in the through holes. In one embodiment, the interposer is dissolvable. In another embodiment, the through holes are at least partially filled with a conductive material for electrically connecting to the die. In another embodiment, the through holes are angled so that the interposer acts as a pitch spreader or adapter. In another embodiment, ball bumps are disposed on a side of the interposer away from the die. In the electronic system, a semiconductor die may be disposed on a side of an optically transmissive preformed planar structure (interposer), and an optical element is disposed on an opposite side of the interposer. The interposer may be provided with through holes extending at least partially into the die side, and electrical probes in the through holes, for making contact to raised conductive bumps on the die. The interposer may be provided with raised portions for locating the optical element at a predetermined distance away from the die. The interposer may be provided with darkened areas for preventing light from impacting selected areas of the die. Various other embodiments are directed to multi-tier flip-chip arrays employing preformed planar structures between tiers.

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