July 2012
Intermediate to advanced
360 pages
11h 50m
English
Content preview from Green Electronics Manufacturing
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55Fatigue Characterization of Lead-Free Solders
Copper density is γ = 8,920 kg/m
3
. Let us now calculate 1 oz. copper layer
thickness h.
Suppose that the copper weight number has unlimited precision
(idealization) (Figure3.6).
It is supposed that 1 oz. of copper per square foot corresponds to 35-μm
copper thickness. Let us calculate the so-called sheet resistivity of a 1-oz.
copper layer. Sheet resistivity is the resistivity of a square pattern of given
thickness. The resistance of a rectangular pattern may be calculated as
follows:
R
l
S
l
hb
h
l
b
=ρ
=ρ
⋅
=
ρ
⋅
(3.8)
where
L is length [m]
B is width [m]
H is thickness [m]
S is cross-sectional area [m
2
] (perpendicu ...
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