Browse Prior Art Database

Device Locator

IP.com Disclosure Number: IPCOM000082425D
Original Publication Date: 1974-Dec-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Gabric, JA: AUTHOR [+2]

Abstract

Described is a tool that allows precise alignment positioning of face down integrated circuit chips, by aligning the chips with respect to the perimeter of their solder pads using a channel having stepped shoulders.

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Device Locator

Described is a tool that allows precise alignment positioning of face down integrated circuit chips, by aligning the chips with respect to the perimeter of their solder pads using a channel having stepped shoulders.

Prior art alignment techniques use a rib that passes between selected pads on the chip. This rib may result in damage to the chips, due to silicon particles puncturing or scratching the surface of the chip as the chip moves over the rib. The present tool, by eliminating the locating rib and using shoulders in the channel, results in a decrease in damage to the surface of the device, thus significantly increasing the reliability and yield of the chips.

The tool 10 is shown in Figs. 1 and 2 and comprises a U-shaped channel 11 having a wide mouth 12 which narrows to a width W, just sufficient to permit the passage of a semiconductor chip 13 therethrough. As the mouth 12 of channel 11 constricts there is provided a pair of shoulders 15 and 16, which shoulders are separated by a width w which is equal to the width of the pads 14 on the chip 13. These shoulders align the chip 13 in a precise location with respect to the perimeter of the pads 14, as the chip moves into the channel 11. The chip 13 is supported by pads 14 in channel W. A pickup. not shown, may then be used to pickup the chip and transport it to subsequent operating positions. The ability to locate the chips 13 from the edges of the pads 14, rather than by utilizing a locating ri...