SMD Package Chip Resistor Pack (SMT resistor or Chip resistor) of 1206 package is a rectangular-shaped SMD resistor. 1206 SMD package is correlated with its land pattern in inches. Here, 1206 SMD, the “12” means it is 0.12 inches in length and the “06” means it is 0.06 inches in width. So the dimension of 1206 SMD is .12” x .06”(3.2mm x 1.6mm x 0.55mm). It is having a metallic area on both sides of the ceramic body and that metallic end is placed to PCB where it has a pad and soldered. If you want to make your PCB size so small as possible then undoubtedly go for SMD.