The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 1993
Filed:
Mar. 27, 1991
Bruno R Aimi, Williston, VT (US);
Ralph F Antonucci, Newburgh, NY (US);
Ferdinand D Dimaria, Wappingers Falls, NY (US);
Hamid R Torabi, Essex Junction, VT (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An apparatus for conducting burn-in tests of circuit chips in which frangible connections are made between contact points of a reusable carrier and a chip to be tested. At the end of the burn-in test, shear force is imparted such that the frangible connections are broken without causing damage to the chip or the carrier. The carrier has at least one lead line or pad made of solder wettable material such as copper for making electrical connections with solder balls of the chip. The lead line is covered with an overlay which is made of non-wettable material to which solder will not adhere. Holes are provided in the overlay such that a restricted connection may be made between the solder balls and the underlaying lead line when the solder is reflowed. At the end of the test, linear shear force is imparted such that the connections between the solder balls and the lead line are broken. The solder balls are then reflowed to reshape them for subsequent use.