PCX8240VTPU200EZD3 Atmel, PCX8240VTPU200EZD3 Datasheet - Page 13

• Manufacturer Part Number: PCX8240VTPU200EZD3
• Description: IC MPU 32BIT 200MHZ 352TBGA
• Manufacturer: Atmel

Specifications of PCX8240VTPU200EZD3

• Processor Type: PowerPC 603e 32-Bit RISC
• Speed: 200MHz
• Voltage: 2.5V
• Mounting Type: Surface Mount
• Package / Case: 352-TBGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

Adhesives and Thermal
Interface Materials
2149A–HIREL–05/02
A thermal interface material is recommended at the package lid-to-heat sink interface to
minimize the thermal contact resistance. For those applications where the heat sink is
attached by spring clip mechanism, Figure 7 shows the thermal performance of three
thinsheet thermal-interface materials (silicone, graphite/oil, floroether oil), a bare joint,
and a joint with thermal grease as a function of contact pressure. As shown, the perfor-
mance of these thermal interface materials improves with increasing contact pressure.
The use of thermal grease significantly reduces the interface thermal resistance. That is,
the bare joint results in a thermal resistance approximately 7 times greater than the ther-
mal grease joint.
Heat sinks are attached to the package by means of a spring clip to holes in the printed-
circuit board (see Figure 6). Therefore, the synthetic grease offers the best thermal per-
formance, considering the low interface pressure. Of course, the selection of any
thermal interface material depends on many factors, thermal performance requirements,
manufacturability, service temperature, dielectric properties, cost, etc.
Figure 7. Thermal Performance of Select Thermal Interface Material
1.5
0.5
2
1
0
0
10
20
Contact Pressure (PSI)
30
40
50
Silicone Sheet (0.006 inch)
Bare Joint
Floroether Oil Sheet (0.007 inch)
Graphite/Oil Sheet (0.005 inch)
Synthetic Grease
60
PC8240
70
80
13