Acoustic Inspection of Hybrid Systems on Laminated Substrates
- Posted by Francisco Javier Aparicio Rebollo
- On September 3, 2019
- 0
Summary
Hybrid microelectronics within plastic packages are comprehensively inspected thanks to the con-focal resolution provided by the scanning acoustic microscopy technique. The high depth resolution allows us to resolve top and inner metallic layers of the laminate.
Remarks
Con-focal scanning acoustic microscopy is used to thoroughly inspect features at different layers of hybrid multichip modules (MCM). The inspection does not reveal rejectable features at the different discrete components included in this assembly, either active (ICs and semiconductor dice) or passive (resistors, capacitors and inductors), and over the top metallic layer. Non-circuit side inspection is used to assure the lack of delamination within the laminate (e.g. inner metallic layers).
Assesment as per different test methods
In Alter Technology scanning acoustic tomography inspection of plastic encapsulated microcircuits (PEMs) and similar systems is conducted in accordance with different inspection methods (J-STD-020E, ESCC 25200, PEM-INST-001, MIL-STD-1580 and others). Nonetheless, in the matter at hand, specification J-STD-020E is the most suitable as it includes specific requirements for the inspection of substrate-based packages, such as the laminated multichip module (MCM-L) herein analyzed. In this case, no anomalies are observed in agreement to this specification.
Sample & Method
A RF Variable Gain Amplifier (VGA) module encapsulated in a MCM package is investigated. Probe frequencies and inspection procedure are adapted to the internal structure of this plastic encapsulated microelectronic part. In this case the architecture of the system includes both thick and thin discrete components onto a multilayer laminates substrate. Therefore, circuit side inspection is conducted using a low frequency transducer to extend the depth of field whereas the high frequency transducer used during the non-circuit side inspection allows us to resolve inner conductive layers within the laminate.
Contact us
Since 2007 Dr. Aparicio has developed a productive research career within the field of Materials Science including post-doctoral stays at the University of Trento, the University of Mons, and the Spanish National Research Council (CSIC). His researches have been published in more than 30 articles in reputed international research journals and conferences (> 70) including more than 10 invited talks and lectures.
Within the frame of the program “Torres Quevedo” for the Knowledge Transfer and the incorporation of research talent into the industry, in 2019 he joined Alter Technology as Senior Materials Science Test Engineer. In 2019 he was appointed to lead the Scanning Acoustic Microscopy Service. Within this framework, he currently collaborates in different ESA projects (JUICE and PLATO).”
Actually, he is not in our company anymore, but still as an external collaborator in our blog.
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