Hybrid Soldering 2.3D Assembly with High Reliability and Low Cost

Han Wen Hu, Yu Wei Huang, Yi Chieh Tsai, Meng Kai Shih, Kuan Neng Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


In this study, an advanced 2.3D solution was proposed to integrate RDL interposer and FR-4 substrate using the technique of hybrid soldering, which applies printing of epoxy solder paste to form the hybrid joint. The simulation was performed to evaluate warpage and von Mises stress of different joint structures, indicating that the hybrid joint structure is promising for the reliability of 2.3D assembly. In addition, hybrid soldering 2.3D assembly was successfully demonstrated, followed by SEM analyses, electrical measurements, warpage measurements, and thermal cycling tests for 5000 cycles. The experimental results validate that the packaging can achieve high reliability without the needs of underfill. Thus, this solution paves the way for large area 2.3D integration with low cost, high throughput, and high reliability.

Original languageEnglish
Pages (from-to)791-796
Number of pages6
JournalIEEE Journal of the Electron Devices Society
StatePublished - 2022


  • 2.3D integration
  • hybrid joint
  • hybrid soldering
  • RDL interposer


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