Guide

Thermal and Mechanical Design
26 Intel® Xeon® Processor E7 2800/4800/8800 v2 Product Family
Thermal/ Mechanical Specifications and Design Guide
2.1.2.4.9 Contact Load-Deflection Curve
The contact shall be designed with an appropriate spring rate and deflection range, as
illustrated in Figure 2-12, to ensure adequate contact normal force in order to meet
EOL performance at all contact locations. The load-deflection curve is not necessary to
be linear between the minimum and maximum deflection points. The LGA contact
working range is defined as the difference of contact deflection at the minimum contact
load and the maximum contact deflection. Minimum contact normal force should be
15 gf (gram force). The deflection (working) range shall be no less than 0.25 mm from
nominal contact free height.
Figure 2-11. Contact Wiping Direction
Figure 2-12. Contact Force versus Contact Deflection Range
Contact deflection
Contact force
Deflection range
Max deflection
Minimum Contact
Normal Force
Contact deflection
Contact force
Deflection range
Max deflection
Minimum Contact
Normal Force
Deflection (Working) Range
(At nominal
free height)