The
Ceramic Package,
or Cerpack,
is a hermetically sealed rectangular ceramic package that has leads extending from both
of its longer sides, thus forming two sets of in-line pins.
It is therefore a type of dual-in-line package (DIP) like the
CerDIP.
|
 |
|
Figure 1. Example of a Cerpack |
Just like the CerDIP, the Cerpack's ceramic body is composed of an upper
part called the 'cap' and a lower part called the 'base'. After
the die has been mounted and wire-bonded inside it, the base is sealed
with the cap using molten seal glass that solidifies into a
moisture-resistant material once it cools down.
The difference between a CerDIP and a Cerpack is that the leads of the
latter are directly attached to the base (lower half) of the package
body. Cerpacks, therefore, no longer need to have a lead frame
attached to the base unlike the CerDIP.
Cerpack lead counts range from 3 to 40. The lead pitch of a
Cerpack package is typically 50 mils. Table 1 shows typical
nominal values for the dimensions of some examples of Carpacks.
Table 1. Properties of
Some Examples of Cerpacks
|
Lead
Count |
Width |
Length |
Thickness |
Lead
Pitch |
|
10
|
241
mils |
270
mils |
70
mils |
50
mils |
|
14
|
250
mils |
390
mils |
70
mils |
50
mils |
|
16
|
250
mils |
390
mils |
70
mils |
50
mils |
|
20
|
266
mils |
540
mils |
75
mils |
50
mils |
