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- W4207066343 abstract "Heterogeneous integration technology makes possible the integration of multiple separately manufactured components into a single higher level assembly with enhanced functionality and improved operating characteristics. Various types of advanced heterogeneous packages are available, including 2.5-D integrated circuit (IC), fan-out chip on substrate (FOCoS) chip-first, and FOCoS chip-last. This study constructs a nonlinear simulation technique (3-D simulation model) to explore the warpage, extreme low-<inline-formula> <tex-math notation=LaTeX>$k$ </tex-math></inline-formula> (ELK) interconnect stress, redistribution layer (RDL) trace stress, and board-level solder joint reliability of all three packages. The validity of the simulation model is confirmed by comparing the numerical results for the in-plane dimensional change of an FOCoS chip-last package with the experimental observations over the temperature range of 30 °C–260 °C. The thermal performance (i.e., junction-to-ambient thermal resistance) of the three packages is then examined and compared. Finally, <inline-formula> <tex-math notation=LaTeX>$2^{5}$ </tex-math></inline-formula> factorial designs with the analysis of variance (ANOVA) are conducted to examine the effects of the main structural design parameters of the FOCoS chip-last package on its thermomechanical reliability under typical thermal loading conditions. It is shown that a thinner polyimide (PI) layer is beneficial in improving the package reliability by minimizing the coefficient of temperature expansion (CTE) mismatch between the PI layer and the RDL trace, respectively." @default.
- W4207066343 created "2022-01-26" @default.
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- W4207066343 date "2022-02-01" @default.
- W4207066343 modified "2023-10-02" @default.
- W4207066343 title "Thermal and Mechanical Characterization of 2.5-D and Fan-Out Chip on Substrate Chip-First and Chip-Last Packages" @default.
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- W4207066343 doi "https://doi.org/10.1109/tcpmt.2022.3145377" @default.
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