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:
Apr. 21, 1992
Filed:
Feb. 27, 1989
Hitachi, Ltd., Tokyo, JP;
Hitachi VLSI Engineering Corp., Tokyo, JP;
Abstract
A semiconductor device of pin-grid array (PGA) type, which is adapted for surface-mounting on a printed circuit board, has lead pins arranged in a grid and standing perpendicularly on a base of the semiconductor device. In addition, a few pins are provided which are longer than said lead pins in said grid. When the device is placed on the printed circuit board for mounting, the longer pins are inserted into through-holes which are respectively formed in the printed circuit board to correspond to the position of the longer pins of the device. Thus, the tip of the lead pins are accurately positioned on the top of lands on the printed circuit board, respectively, and the lead pins do not get out of position during the mounting operation.