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Equation 6 · Comparing the Main Approaches to Chiplets and Advanced Packaging

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PP

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the power dissipated at that tier and each Rth,iR_{\mathrm{th},i} is the thermal resistance of one layer already between that tier and the heat sink — die bulk, bonding interface, or an intervening active tier. Read the equation part by part below; each part has a contextual explanation and a link to its mathematical background.

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PP

Symbol P

the power dissipated at that tier and each Rth,iR_{\mathrm{th},i} is the thermal resistance of one layer already between that tier and the heat sink — die bulk, bonding interface, or an intervening active tier.

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where P is the power dissipated at that tier and each Rth,iR_{\mathrm{th},i} is the thermal resistance of one layer already between that tier and the heat sink — die bulk, bonding interface, or an intervening active tier. A tier two layers from the heat-removal face inherits the resistance of everything below it in a way a single die never does, which is why thermal co-design and power-tier placement, not raw stack height, are what determine whether a given 3D design is thermally viable.

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