Browse Prior Art Database

Ultrasonic Chip Removal from Burn-in Substrates

IP.com Disclosure Number: IPCOM000108420D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 1 page(s) / 49K

Publishing Venue

IBM

Related People

Puttlitz, KJ: AUTHOR [+2]

Abstract

This disclosure describes a technique to remove burn-in chips from test substrate that ensures burned-in chips maintain a constant interconnection solder volume after removal from the substrate.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 88% of the total text.

Ultrasonic Chip Removal from Burn-in Substrates

      This disclosure describes a technique to remove burn-in chips
from test substrate that ensures burned-in chips maintain a constant
interconnection solder volume after removal from the substrate.

      As shown in FIG. 1, the test substrate (1) with the burnedin
chip (2) is mounted within substrate mount or fixture (3), which
itself is rigidly attached to a mechanical element (4) capable of
X,Y,Z and O adjustment. The chip (2) is positioned so it can be
coupled to an arm (5) of an ultrasonic horn.  Coupling may be
achieved in a number of ways.  For example, a stud (6) may be
directly affixed to the backside of a chip with glue or adhesive (8).
A preferred method of coupling is to utilize a coupling fixture which
has a key feature: coupling between fixture and chip without a
bonding agent used between them.  For example, such a fixture could
consist of the stud (6) which is attached to a semi-rigid hat (7) by
using a suitable adhesive (8).  The hat (7) is to be configured such
that it contains an opening slightly larger than the chip (2)
dimension.  Accordingly, the chip (2) is to be positioned within the
hat (7), although the inside edges of the hat (7) will contact the
chip sides.  The chip, however, will not be damaged owing to the
flexible properties of the hat (7) material.  Once the chip is
separated from the test substrate (1), which only requires a few
seconds or less, no further processes are neces...