Active solid-state devices (e.g. – transistors – solid-state diode – Combined with electrical contact or lead – Solder wettable contact – lead – or bond
Patent
1996-06-05
1998-07-14
Arroyo, Teresa M.
Active solid-state devices (e.g., transistors, solid-state diode
Combined with electrical contact or lead
Solder wettable contact, lead, or bond
257735, 257783, H01L 2348, H01L 2352, H01L 2940, H01L 2312
Patent
active
057809313
ABSTRACT:
A surface mounting semiconductor device or a mounting component includes a metallic carbonate coating on a mounting surface which may be a plated layer of a metal easy to solder on which an outer lead or the like is to be mounted so that the oxidation of the mounting surface of the outer leads during storage is reliability prevented. Upon mounting the semiconductor device to the circuit board with solder, the heat added causes the metallic carbonate coating to decompose, to evolve CO.sub.3, and leave active metal, significantly improving solder wettability, so that a reliable solder joint is obtained. Since CO.sub.3 is evolved in the gaseous state, it does not stay on the metal surface, eliminating the need for cleaning after the treatment. Because solder wettability is significantly improved, molten solder cannot flow from the side of the soldered joint to bridge outer leads and terminals.
REFERENCES:
patent: 3665590 (1972-05-01), Percival
patent: 4711026 (1987-12-01), Swiggett et al.
patent: 4859807 (1989-08-01), Swiggett et al.
patent: 5235139 (1993-08-01), Bengston et al.
patent: 5492235 (1996-02-01), Crafts et al.
patent: 5607609 (1997-03-01), Sakuyama et al.
Kurokawa Hiroshi
Okajima Toshihiro
Shimoda Hiroshi
Arroyo Teresa M.
Mitsubishi Denki & Kabushiki Kaisha
LandOfFree
Surface mounting semiconductor device and semiconductor mounting does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Surface mounting semiconductor device and semiconductor mounting, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface mounting semiconductor device and semiconductor mounting will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1885046