Bottom SMD pads are the conductive leads or pads located on the underside of a SMD component, typically an IC. These pads are specifically designed for installation on a circuit board that has been planned and designed to have corresponding pads for soldered installation of the component. The bottom SMD pads are rectangular or square in shape and are usually silver-colored. They are visible when the IC component is turned over. On the PCB, there will be gold-colored pads of the same size and shape as the terminal on the bottom of the IC chip. These pads are gold-plated.