Components that are compatible with surface mount PC board technology. Holes are not used for component mounting. Component leads are soldered to pads on the surface of the PC board (on the same side as the components). For switches, typically defined by surface mount terminations (e.g., JBend. L-Bend, butt, etc.) and compatibility with surface mount soldering (e.g., vapour phase reflow, infrared, etc.) and cleaning processes.