Circuitized substrate for fixing solder beads on pads

Active solid-state devices (e.g. – transistors – solid-state diode – Combined with electrical contact or lead – Ball or nail head type contact – lead – or bond

Reexamination Certificate

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Details

C257S779000, C174S261000, C361S743000, C361S767000, C361S772000, C361S808000

Reexamination Certificate

active

07045902

ABSTRACT:
A circuitized substrate has contact pads for mounting a Surface Mount Device (SMD). First and second contact pads are located on a surface of the substrate corresponding to a first terminal and a second terminal of the SMD. The first and the second contact pads have a plurality of expanded portion or diminished portions to form bead receptacles at the facing corners thereof. When solder paste is reflowed to electrically connect the SMD, solder beads formed from the solder paste can be fixed on the bead receptacles. Therefore, there is no free solder bead on the substrate causing short circuit for semiconductor packages.

REFERENCES:
patent: 5453581 (1995-09-01), Liebman et al.
patent: 5838070 (1998-11-01), Naruse et al.
patent: 6060778 (2000-05-01), Jeong et al.
patent: 6259608 (2001-07-01), Berardinelli et al.
patent: 6657133 (2003-12-01), Chee
patent: 6667557 (2003-12-01), Alcoe et al.
patent: 6707680 (2004-03-01), Schaper
patent: 6959489 (2005-11-01), Beroz et al.
patent: 472367 (2002-01-01), None

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