US 5,204,287 A · Integrated circuit device having improved post for surface-mount package

Abstract

An electronic device (10) includes a package (16) having two posts (30) suitable for insertion in PCB holes. Package (16) presents a lengthwise molding plane (32) along which the upper portion (42) and bottom portion (44) of package (16) are mated during the molding process. Posts (30) are disposed substantially exclusively in bottom portion (44) so that posts (30) are asymmetric about lengthwise molding plane (32). Thus, even if a top mold (42a) and a bottom mold (44a) are misaligned there will be no effect on the dimensional tolerance of posts (30) and thus the tolerance of post (30) can be closely matched with a PCB hole (20) tolerance to insure a snug fit. Thus, device (10) is mounted edgewise on a PCB (18) by insertion of posts (30) into PCB holes (20) so that tips (24) of lead fingers (14) can be connected to PCB (18) by surfacing-mounting techniques or the like.

Claims2

Dependent claims

A method of manufacturing an integrated circuit device or the like, the method comprising the steps of:

forming a package encapsulating a semiconductor die, said package including a plurality of posts integral therewith and extending from at least one edge of said package, said package presenting a lengthwise molding plane;
and
connecting a plurality of lead fingers to said die, said lead fingers extending from at least one edge of said package,
at least one of said posts only on one side of said lengthwise molding plane so as to fit into holes in a printed circuit board for mechanically positioning and supporting said package when said lead fingers are affixed to the printed circuit board.

1 more element

Dependencies are inferred from the claim text.

Integrated circuit device having improved post for surface-mount package

Life of this patent

Integrated circuit device having improved post for surface-mount package

Life of this patent

Abstract

Claims2