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Pr oduc t Ch ang e Ov er User Re f eren ce Manu al 4022 591 960 82 6-54 FCM M ult ifle x 02.02 Lea d Gro up A lead gr oup is defined as a numb er o f in -l in e arr a n g e d l e a ds with id entical dim en sions an d id…
4022 591 96082 User Reference Manual
02.02 FCM Multiflex 6-53
Product Change Over
Component Length and Width
Once you have determined the component’s sides definition (see section before),
you have to know what component sides are defined as length respectively width.
See following table for determination.
TABLE 6-22
REMARK: Please note that according to this definition NOT the longest component
side automatically is defined as “ length” !
Component Body and Outline
Depending on the component type, measurements are done component package
body-based or component package outline-based. See FIGURE 6-20.
FIGURE 6-20 Component package’s body versus outline
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LENGTH WEST-EAST X-axis
WIDTH SOUTH-NORTH Y-axis
packag
e
outlin
e
package
bod
y
Product Change Over
User Reference Manual 4022 591 96082
6-54 FCM Multiflex 02.02
Lead Group
A lead group is defined as a number of in-line arranged leads with identical
dimensions and identical pitch; see FIGURE 6-21.
FIGURE 6-21 Lead group definition
Leading Lead (first lead)
To determine what lead from a lead group is defined as the first one, the leading
lead, following approach is valid:
■ First find out what is the component’s Nort side, East side etc. (see before);
■ Looking from West to East, the first lead you “meet” in the lead group(s) is the
leading lead. This goes for the North and the South side;
= leadgroup
4022 591 96082 User Reference Manual
02.02 FCM Multiflex 6-55
Product Change Over
■ Looking from North to South, the first lead you “meet” in the lead group(s) is
the leading lead. This goes for the West and the East side.
FIGURE 6-22 Leading lead determination
6.7.2.3 Package Dimensions Definitions
Depending on the component type, the component’s outline dimensions or its
body dimensions are measured. See table below.
TABLE 6-23
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GHILQH
Symmetric Yes (QFP, SOP, PLCC) Outline Outline
Asymmetric Yes (QFP, SOP, SOT) Body Outline
No (PLCC, SOJ, SOD, R, C) Outline Outline
North
South
West
East
1
1
1
1
1
1