As the name suggests, the flat bridge is flat in appearance, and the internal structure is a single-row array three-dimensional type, so the internal four chips are in the same horizontal line, so the design of the shape is flat. There are many packages using flat Bridges, and the familiar ones are KBP, KBL, KBU, KBJ, GBJ, RBV, DSB, RS and so on. So the package adopts the shape of the flat bridge naturally has its own charm, and its advantage is to facilitate the external installation of the heat sink, and the flat bridge is posted on the heat sink, which is very easy and fast.