Wafer test and burn-in platform using ceramic tile supports
First Claim
1. A test head structure for testing a plurality of chips on a wafer having a wafer thermal expansion characteristic, said test head structure comprising:
- a support platform formed of a material having a thermal expansion characteristic substantially equal to the wafer thermal expansion characteristic, wherein said support platform has a plurality of openings; and
a plurality of multilayer substrates each formed of a material having a thermal expansion characteristic substantially equal to the wafer thermal expansion characteristic and having a wafer support surface and a back surface, said wafer support surface comprising a plurality of electrical contacts disposed in a pattern, said substrates being mounted on said support platform wherein said back surface of said plurality of multilayer substrates is accessible through said openings.
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Accused Products
Abstract
A plurality of multilayer glass-ceramic substrates are arranged in coplanar relationship in a tile pattern within a support platform. The glass-ceramic substrates and the support platform are both formed of materials having thermal expansion characteristics substantially equal to that of a wafer which is supported by the coplanarly aligned substrates during test and burn-in of the wafer. The present invention effectively solves the problem of providing a single large support member for wafer test and burn-in, which heretofore have been limited in mechanical properties and power capability.
55 Citations
18 Claims
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1. A test head structure for testing a plurality of chips on a wafer having a wafer thermal expansion characteristic, said test head structure comprising:
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a support platform formed of a material having a thermal expansion characteristic substantially equal to the wafer thermal expansion characteristic, wherein said support platform has a plurality of openings; and a plurality of multilayer substrates each formed of a material having a thermal expansion characteristic substantially equal to the wafer thermal expansion characteristic and having a wafer support surface and a back surface, said wafer support surface comprising a plurality of electrical contacts disposed in a pattern, said substrates being mounted on said support platform wherein said back surface of said plurality of multilayer substrates is accessible through said openings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for forming a test head structure for testing a plurality of chips on a wafer having a predefined thermal expansion characteristic, comprising:
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providing a support platform of a material having a thermal expansion characteristic substantially equal to the thermal expansion characteristic of said wafer; providing a plurality of multilayer substrates, said substrates each having a first planar surface and a second planar surface, said second surface opposite said first surface, said substrates having internally disposed electrical circuits for connecting electrically conductive surface features on said first surface with electrically conductive surface features on said second surface, said substrates being formed of a material having a thermal expansion characteristic substantially equal to the thermal expansion characteristic of said wafer; forming said electrically conductive surface features on said first surface and on said second surface of each of said substrates; arranging said substrates in a fixture whereby each of said substrates is arranged in coplanar relationship with other ones of said substrates and at least one defined edge of each of said substrates is disposed in controlled spaced relationship with a respective defined edge of at least one other of said substrates; and mounting said arranged substrates in said support platform whereby the coplanar relationship of the substrates and the controlled spaced relationship of the respective defined edges of the substrates are maintained in fixed relationship by said support platform during subsequent testing and burn-in processing of the wafer. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification