The
Plastic Pin
Grid Array,
or PPGA,
is
a square-shaped plastic package whose pins or leads are arranged in a
square array at the bottom of the package body. The PPGA is just
one of several types of the PGA package. Because of the array
arrangement of the leads in a PGA package, it can provide much higher
lead counts than other packages. This is the reason why the PGA is a popular choice for devices
with high I/O counts such as microprocessors.
Typical PPGA's have
pin counts that range from 68 to 503, although PPGA's with more pins do exist. The pins in a PPGA are usually spaced 100 mils
(approx. 2.5 mm) or 50 mils (1.25 mm) apart.
The PPGA can either be directly
soldered onto a through-hole PCB or used with a PGA socket.
Table 1.
Properties of Some PPGA's
|
No. of Pins |
Body
Size |
Body Thickness |
Pad Pitch |
|
68 |
28.2 mm x
28.2 mm |
3 mm |
2.5 mm |
|
120 |
35.1 mm x
35.1 mm |
3 mm |
2.5 mm |
|
156 |
42.7 mm x
42.7 mm |
3 mm |
2.5 mm |
|
296 |
49.5 mm x
49.5 mm |
3 mm |
2.5 mm |
|
411 |
52.8 mm x
52.8 mm |
3 mm |
2.5 mm |
|
503 |
57.9 mm x
57.9 mm |
3 mm |
2.5 mm |
