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SEMI G2-94 © SEMI 1994 7 METHOD #1 METHOD #2 REF PLANE Figure 4 Twist St rip Using surface plate, establish a ref erence plane the wh ole length of the frame strip. Place frame strip, eith er method 1 or 2, w hichev er m…
SEMI G2-94 © SEMI 1994 6
Figure 1
Bow
Figure 2
Camber
Figure 3
Stamped Leadframe Terminology
SEMI G2-94 © SEMI 19947
METHOD #1
METHOD #2
REF PLANE
Figure 4
Twist Strip
Using surface plate, establish a reference plane the whole length of the frame strip. Place frame strip, either method
1 or 2, whichever method gives a 3 point contact with reference plane A, using thickness gauges to determine height
between reference plane and 4th point noted as t. This measurement will determine frame twist over entire length.
Figure 5
Standoff Lead Length
SEMI G2-94 © SEMI 1994 8
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