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

13
Design Effectiveness
Processor Package Pull-Out - 1
 Both vertical and lateral shock
conditions can produce pull-out
 Pull-out occurs when heatsink moves up
or shifts laterally excessively during shock
 Primary factors
 Heatsink mass
 TIM adhesion
 Package Integrated Heat Spreader (IHS) area
 Package pin geometry
 Socket retention force

Current solution approach:
 Compressive preload
 Stiff retention clip
Socket
Heatsink
Inertial
Load
Socket
Heatsink
Inertial
Load
Package pull-out in
vertical shock
Clip
Load