Active solid-state devices (e.g. – transistors – solid-state diode – Lead frame
Reexamination Certificate
2006-09-27
2008-12-02
Williams, Alexander O (Department: 2826)
Active solid-state devices (e.g., transistors, solid-state diode
Lead frame
C257SE23037, C257SE23046, C257SE21504, C257SE21505, C257S669000, C257S670000, C257S671000, C257S672000, C257S674000, C257S695000, C257S696000, C257S676000
Reexamination Certificate
active
07459770
ABSTRACT:
A lead frame structure is provided, which includes a die pad having a first mounting portion and a second mounting portion separated from the first mounting portion by a gap. The first and second mounting portions are formed with corresponding blocking surfaces bordering the gap, so as to allow a flow rate of an encapsulating resin flowing through the gap during a molding process to be reduced by the blocking surfaces, such that different portions of the encapsulating resin respectively flowing above, in and below the die pad can have substantially the same flow rate, thereby preventing bonding wires from being deformed to cause short circuit and avoiding formation of voids. A semiconductor package with the lead frame structure is also provided.
REFERENCES:
patent: 6677665 (2004-01-01), Huang
patent: 7012325 (2006-03-01), Ahn et al.
patent: 2002/0113305 (2002-08-01), Huang
patent: 2002/0121680 (2002-09-01), Ahn et al.
patent: 2003/0151123 (2003-08-01), Huschka et al.
patent: 2006/0097371 (2006-05-01), Kawasaki et al.
patent: 2007/0040249 (2007-02-01), Kajiwara et al.
patent: 2007/0252247 (2007-11-01), Kim et al.
Chiang Lien-Chen
Lin Ming Cheng
Liu Hung-Wen
Tsai Wen-Shan
Wei Chien-Feng
Birch & Stewart Kolasch & Birch, LLP
Siliconware Precision Industries Co. Ltd.
Williams Alexander O
LandOfFree
Lead frame structure having blocking surfaces and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Lead frame structure having blocking surfaces and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lead frame structure having blocking surfaces and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4046808