This part of 60191 gives guidelines on the preparation of outline drawings of discretedevices.NOTE: For preparation of outline drawings of surface mounted discrete devices, IEC 60191-6 should be referred to as well.The primary object of these drawings is to indicate the space which should be allowed for devices in an equipment, together with other dimensional characteristics required to ensure mechanical interchangeability.It should be noted that complete interchangeability involves other considerations such as theelectrical and thermal characteristics of the semiconductor devices concerned.The international standardization represented by these drawings the