Mechanical Enabling for the Intel Pentium 4 Processor in the 478-Pin Package

20
Design Effectiveness
Intel
®
Pentium
®
4 Processor in the 478-Pin
Package Clip Design
 Clip design tailored to achieve
target stiffness:
 1100 lb/in
 Mechanical advantage levers
generate preload:
 60 lb minimum
 75 lb nominal
 Performance under shock load
(+z):
 Compressive load between heatsink and
package maintained: no package pull-out
 Solder ball load prevents from excessive
tensile loads, and provides protection to
socket solder joint.
Clip stiffness = 1100 lb/in
Mechanical advantage
levers used to
produce 75 lb preload