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Full or partial passivation of the termination contacts on a multilayer ceramic capacitor is provided by the formation of layers of chemical vapor deposited (CVD) glass or sputtered quartz.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
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Passivation of Multilayer Ceramic Capacitors
Full or partial passivation of the termination contacts on a multilayer ceramic
capacitor is provided by the formation of layers of chemical vapor deposited
(CVD) glass or sputtered quartz.
In the fabrication of multilayer ceramic capacitors, con- tacts to the capacitor
plates are provided by a series of metal stripes formed on one surface of the
capacitor body. An array of solder balls is then formed to provide contact to the
device on which the capacitor is mounted. This method passivates or isolates
the metal stripes, providing a structure to aid in the formation of the solder balls.
Referring to Fig. 1, a series of metal stripes 1 is formed on a capacitor body
2, e.g., by deposition through a metal mask. The stripes 1 provide contact to
selected parallel plates (not shown) in the capacitor body 2. In Fig. 2, a blanket
layer 3 of an insulator such as CVD glass or sputtered quartz is formed on the
body 2 covering the metal stripes 1. Contact holes 4 in the desired pattern are
formed in layer 3 by conventional photolitho- graphy, as shown in Fig. 3. A full
"solder dam" is thus provided for the formation of solder balls in the contact
A partial solder dam may be formed as shown in Figs. 4 and 5. The metal
stripes 1 are formed as above by deposition through a metal mask 5, shown in
Fig. 4. The mask 5 is then shifted so that the metal stripes 1 are covered and the
regions between the stripes are uncovered. The CVD...