Decapsulation of epoxy packaged devices, such as integrated circuits (IC’s) or potted modules, uses heated acids (nitric and sulfuric) to remove the encapsulant to expose the internal components or silicon die within the package. Opening devices by decapsulation allows inspection of the die, interconnects and other features typically examined during failure analysis. Device failure analysis often relies on the selective etching of polymer encapsulants without compromising the integrity of the wire bonds and device layers.
New integrated circuit packaging technologies have become a challenge to safely decapsulate with acid. Often the strength of the acid required to successfully remove the new high temperature epoxy encapsulants also destroys the bond wires and bond pads. Many cost sensitive designs use copper or copper plated bond wires. To address the limitations of acid decapsulation, Accolade has developed a microwave decapsulation system that selectively removes the encapsulant without harming any of the electrical structures of the part. With a small diameter atmospheric plasma source, selective encapsulant removal is possible and with closed loop process temperature control, the sample is quickly and safely decapsulated. Parts can also be decapsulated while still resident on the printed wiring board to aid in post decapsulation analysis.
One of the most important and often overlooked methods to ensure electronic assembly solder process capability and the quality of printed wiring boards is to perform microsections. For the soldering process, external visual inspection (if possible) is a minimal and superficial technique to evaluate the soldering process. Beyond using a real time X-ray system to evaluate solder volume and voiding, a microsection of the solder attachments can provide more detail of the quality of the soldering process and when coupled with intermetallic measurement and elemental analysis with the SEM/EDS system, the quality of the solder process can be fully characterized and provide guidance for improvement of the soldering process. Printed wiring board suppliers are often selected by price and volume capability but the quality of the received material is usually evaluated for plated through hole inside diameters, twist, warp and external evaluation of silkscreen, soldermask and plating. Performing a microsection with acceptability per IPC-6012, IPC-6013 and your fabrication drawing provides the best evaluation of the printed wiring board fabrication process. When coupled with TMA thermal evaluation of the laminate CTE, Tg and time to delamination, the printed wiring board is fully characterized and while still compliance with IPC standards, different suppliers can be easily compared to find the highest quality supplier.
Accolade Engineering Solutions offers a variety of Testing Applications. Contact us today to discuss your testing needs with someone who can provide you with the expert knowledge to determine the right testing solution for you.
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