IEC TR 61188-8 pdf – Circuit boards and circuit board assemblies – Design and use – Part 8: 3D shape data for CAD component library
1Scope
This part of lEC 61188 describes the configuration of part shape data of semiconductor devicesand electrical components registered in the CAD library.
This document mainly describes the configuration of 2D and 3D parts shape data.
Normative references
There are no normative references in this document.
3 Terms,definitions and abbreviated terms3.1 Terms and definitions
No terms and definitions are listed in this document.
IsO and IEC maintain terminological databases for use in standardization at the followingaddresses:
.IEC Electropedia: available at http://www.electropedia.orgl
.IsO Online browsing platform: available at http://www.iso.orglobp3.2Abbreviated terms
The abbreviations used in this document are shown in Table 1.
4 Classification of component shape data
Classification by technical drawing
4.1 The classifications by technical drawing are the following four patterns. The drawing should be managed by agreement between parts manufacturer and equipment manufacturer.
a) 2D drawing;
b) 2D drawing + 3D shape models;
c) 3D models + simplified 2D drawings;
d) 3D annotated models.
4.2 Classification by the kind of component shape data
4.2.1 General
Component shape data distribution are the following three classes. The usage should be
managed by an agreement between parts manufacturer and equipment manufacturer.
a) master data;
b) design-use data;
c) complement data.
4.2.2 Master data
The data which are positioned original when there was a difference between plural data.
4.2.3 Design-use data
The design-use data are directly measured and are treated as a nominal value.
4.2.4 Complement data
The complement data are needed as a reference when the design-use data are insufficient for
CAD data design.
4.3 Relation between technical drawing and component shape data
The relation between technical drawing and component shape data are shown in Table 2.
5 Configuration data of shape data General
5.1 The configuration data of shape data used in components consists of the factors as listed below. The decision of factors should be managed based on agreement between parts manufacturer and equipment manufacturer.
a) dimensions (see 5.2);
b) material distinction (see 5.3);
c) marking (see 5.4);
d) component identification information (see 5.5);
e) reference point and placement angle (see 5.6);
f) scale (see 5.7);
g) CAD format (see 5.8);
h) component shape levels (see 5.9);
i) other attributes (see 5.10).
5.2 Dimensions
5.2.1 Dimensions of 2D drawing
The dimensions of 2D drawing in all dimensions of the prepared data are basically nominal values.
5.2.2 Dimensions of 3D shape models
The dimensions of 3D shape models are as follows:
a) basically, all dimensions in the data to be prepared should be nominal values;
b) The tolerances with 2D drawing are important to clarify;
c) When the description of the dimension is “1.0+0.3/-0.1”, “1.0” is taken as a nominal value.
5.3 Material distinction
To check locations with resin surface and those with metal surface, it is desirable to distinguish them with different colours.
5.4 Marking
If the component has polarity or orientation markings, the markings should not be omitted in the component shape data. An example of marking is shown in Figure 1.