PGA sockets come in many versions

PGA sockets come in many versions Pin-grid-array sockets come in matrix
sizes from 10 x 10 through 25 x 25 with standard 0.100-in. spacing, as
well as in carrier-compatible grid zip sockets for 2- and 2 3/4-in.
2 carriers. Also available are staggered (interstitial) versions
with a 19 x 19 outer matrix and 18 x 18 inner matrix. The sockets are
constructed of polyethersulfone rated to 150oC, or polyamideimide
for up to 175oC. Contacts are beryllium copper or nickel with gold
or nickel boron plating. (Typical price for 150-lead, 150 degreesC-rated,
gold-plated socket, $29.57 ea/1,000; interstitial version, $64 ea/1,
000–available now.) 3M Co., Electronic Products Div. Austin, TX
Product Information 800-225-5373