Guide

Intel
®
Celeron
®
D Processor for Embedded Applications Thermal Design Guide 35
Thermal Design Guidelines
4.8 Package and Socket Load Specifications
Refer to the Intel Celeron D Processor Datasheet for additional information.
These load limits shall not be exceeded during heatsink installation, removal, mechanical stress
testing, or standard shipping conditions. For example, when a compressive static load is necessary
to ensure thermal performance of the thermal interface material between the heatsink base and the
IHS, this compressive static load shall not exceed 100 lbf.
The heatsink mass may also add additional dynamic compressive load to the package during a
shock. Amplification factors due to the impact force during shock have to be taken into account in
dynamic load calculations. The total combination of dynamic and static compressive load shall not
exceed 200 lbf during a vertical shock. For example, with a 1 lbm heatsink, an acceleration of 50 g
during an 11 ms shock results approximately in a 100 lbf dynamic load on the processor package.
If, in addition, a 100 lbf static load is applied on the heatsink for thermal performance of the
thermal interface material and/or for mechanical reasons, the processor/heatsink assembly received
a total load of 200 lbf for the package.
Table 5. Package Static and Dynamic Load Specifications
Parameter Minimum Maximum Notes
Static 44 N [20 lbf] 445 N [100 lbf] 1, 2, 3
Dynamic 890 N [200 lbf] 1, 3, 4
Transient 667 N [150 lbf] 1, 3, 5
NOTES:
1. These specifications apply to uniform compressive loading in a direction normal to the processor IHS.
2. This is the maximum force that can be applied by a heatsink retention clip. The clip must also provide the
minimum specified load on the processor package.
3. These specifications are based on limited testing for design characterization. Loading limits are for the
package only and do not include limits of the processor socket.
4. Dynamic loading is defined as an 11 ms duration average load superimposed on the static load
requirement.
5. Transient loading is defined as a 2 second duration peak load superimposed on the static load requirement,
representative of loads experienced in the package during heatsink installation.