This part of IEC 60191 provides guidelines for the preparation of schematic drawings for discrete devices.
For the preparation of schematic drawings for surface-mounted discrete devices, it is also recommended to refer to IEC 60191-6.
The primary purpose of these drawings is to indicate the space that should be allocated for devices within an equipment, along with other dimensional characteristics required to ensure mechanical interchangeability.
It should be noted that complete interchangeability involves considerations beyond just the electrical and thermal characteristics of the semiconductor devices involved.
The international standard represented by these drawings thus encourages manufacturers of devices to comply with the tolerances shown in the drawings in order to expand their customer base internationally. It also provides equipment designers with assurance of mechanical interchangeability between devices obtained from suppliers in different countries, provided they allow the space indicated in the drawings and take note of the more precise information on bases, studs, etc.
Additional details on the standardization philosophy used in this standard are provided in Annex B.
