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Conventionally, post-temperature cycling reliability tests, polyimide based Print Circuit Board (PCB) offer better solder ball joint reliability than FR4 based PCB. This paper illustrates that for FR4 materials, by applying suitable PCB stack & solder mask design, 1.5 to 2X increase in solder ball joint reliability can be achieved. Reliability improvement is supported by correlation of theoretical...
The Ball grid array (BGA) product fixed on the PCB under Highly Accelerated Stress Test (HAST) reliability test and its relevant corrosion phenomenon are reported. In this article, BGA performed HAST with the socket which individually interconnect between BGA device and PCB test board is subjected to provide moisture path and transfer the applied bias to the PCB. Oxidation and corrosion are found...
After HAST of WLCSP devices mounted on PCB, several short and leakage failures were observed. Non-destructive technique, lock-in thermography (LIT) was applied to localize the fault on PCB. Thereafter, physical failure analysis (PFA) was performed. It revealed solder contamination between the solder bumps of PCB as cause of the failures.
We present a fast and high-throughput sample preparation method for FA (failure analysis) of Cu pillar FCQFN package. Our method facilitates simultaneous decapsulation of multiple devices, and with reduced number of package decapsulation steps. Further, throughput-time (TPT) for sample preparation is reduced from 90 min to 30 min.
We report investigation about three types of conductive carbon particles viz. pure carbon particles, SiO2 filler mixed carbon particles, and SiO2@C core-shell particles in epoxy encapsulations of IC. SEM, EDX, FIB voltage contrast imaging, and Raman spectroscopy are used to characterize conductive carbon particles, and to identify their potential origin.
The purpose of this study is to develop a patient-specific dosimetry estimation system in nuclear medicine examination using a SimSET-based Monte Carlo code. We added a dose deposition routine to store the deposited energy of the photons during their flights in SimSET and developed a user-friendly interface for reading PET and CT images. Dose calculated on ORNL phantom was used to validate the accuracy...
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