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The anti-pyramid stacked chips distribution that can be applied in SIP is reported to have a much better thermal performance comparing to the widely used pyramid distribution. When the package of system is using PCB and LTCC condition, the highest temperature is brought down from 440°K to 417°K and from 326°K to 319°K respectively. In addition, it is also analyzed that the anti-pyramid distribution makes the LTCC packaged system not only has better thermal performance, but also be more reliable. So it is strongly suggested that when the SIP encounter some serious thermal problem, both anti-pyramid stacked chips and LTCC technology should be applied to overcome this problem.