Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making electrical device
Patent
1995-03-07
1997-05-27
McPherson, John A.
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making electrical device
430311, 324765, 438 17, G01R 3126
Patent
active
056331223
ABSTRACT:
An improved test fixture for testing unpackaged semiconductor die and a method for forming the test fixture are provided. The test fixture includes a base formed of a material such as silicon. The base includes a pattern of contact pads corresponding to a pattern of contact locations on the die (e.g., bumped bond pads). The contact pads are connectable via external contacts to external test circuitry. In addition, the test fixture includes an alignment member adapted to align the die on the base. The alignment member includes an alignment opening adapted to cradle the die and form a fluid tight seal. During a test procedure an enclosed cavity is formed between the die held in the alignment opening and the base. The alignment opening is in fluid communication with a vacuum source. Upon application of a vacuum to the cavity, a force is exerted on the die. This places the contact locations on the die in temporary electrical contact with the contact pads on the base.
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Gratton Stephen A.
McPherson John A.
Micro)n Technology, Inc.
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