Rework Fixture for Surface-Mounted Components
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
The Multilayer Ceramic Surface Solder (MLCSS) is a ceramic component with up to 196 very high melt solder balls beneath it. The solder balls are attached to the card and to the component with solder paste that has a lower melting point than the solder balls. During a rework operation reflowing the solder beneath the center of the component that connects the card and the component to the high melt solder balls requires a special fixture, as shown in Fig. 1. The fixture mounts onto tooling already in use with a surface- mounted rework machine. The fixture features an inside and outside baffle to allow the hot air to be directed at the area requiring reflow without exposing the component to excessive and unnecessary heat. The head, as shown in Figs. 1 and 2, consists of four compartments through which air can flow.