The
Ceramic Leadless Chip
Carrier,
or CLCC or LCC,
is
a square or rectangular surface-mount ceramic package that has no leads.
For electrical connection to the outside world, the LCC instead uses
flat metal contacts
(or metallized castellations) known as pads
around the four sides of the package bottom.
Typical LCC's have
pad counts that range from 8 to 84, although LCC's with 100 or more pads
do exist. An LCC's pad pitch (distance between pads) is typically either
50
mils or 40 mils.
The LCC can either be directly soldered
onto the PCB or operated using a socket.
Table 1.
Properties of Some LCC's
|
No. of Pads |
Body
Size |
Body Thickness |
Pad Pitch |
|
8 |
200 mils x
200 mils |
60 mils |
50 mils |
|
20 |
290 mils x
430 mils |
60 mils |
50 mils |
|
28 |
450 mils x
450 mils |
70 mils |
50
mils |
|
32 |
450 mils x
550 mils |
70 mils |
50
mils |
|
44 |
650 mils x 650
mils |
80 mils |
50
mils |
