pga - Computer Definition
(3) (Pin Grid Array) A square chip package with a high density of pins (200 pins can fit in 1.5" square), enabling it to support a large amount of I/O. PGAs are typically ceramic (CPGA), but plastic cases are also used (PPGA). The underside of a PGA package looks like a "bed of nails." In a staggered PGA (SPGA), the pins do not line up in perfect rows and columns. See ZIF socket.