کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
541316 | 1450361 | 2014 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Investigation of pre-bending substrate design in packaging assembly of an IGBT power module Investigation of pre-bending substrate design in packaging assembly of an IGBT power module](/preview/png/541316.png)
• Serious warpage of IGBT power module is induced from assembly processes.
• A pre-bending substrate with a curve opposite the warp is proposed.
• Design is validated by FEA and related actual measurements.
• Increasing DBC thickness of Al2O3 layer reduces warps and bonded solder stresses.
• A thicker base plate is suggested to reduce warping of the entire packaging structure.
Serious warpage and a high level of thermal stress or strain resulting from the heavy coefficients of the thermal extension mismatch between direct bonded copper (DBC) and a copper-base plate are obviously introduced into module structures in the packaging of the power modules of an insulated gate bipolar transistor (IGBT) during multi-temperature cycles of assembly. The aforementioned phenomenon is unfavorable in maintaining the long-term reliability of an IGBT power module because failure modes such as burn-out of connected wires among IGBT chips and growth of cracks in the soldered materials between the DBC and base plate could occur. A pre-bending substrate with a curve opposite the warp direction is proposed in this paper to eliminate warping as well as to achieve suitable co-planarity. The proposed design is found to be effective via finite element method-based simulation validated by experimental measurements. A thick base plate is also recommended to reduce warping of the entire packaging structure based on the predictive results of parametric analyses of the thickness of the Al2O3 and copper-base plates.
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Journal: Microelectronic Engineering - Volume 120, 25 May 2014, Pages 106–113