Composite coating structure in an implantable electronic device

Purpose - The purpose of this paper is to investigate the influence of composite coating structure on the reliability of adhesive flip chip joints. The need for conformal coating is considered, especially for medical applications, and medical sterilization is also considered.Design methodology appro...

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Published inSoldering & surface mount technology Vol. 21; no. 3; pp. 24 - 29
Main Authors Kokko, Kati, Harjunpää, Hanna, Heino, Pekka, Kellomäki, Minna
Format Journal Article
LanguageEnglish
Published Bradford Emerald Group Publishing Limited 26.06.2009
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Abstract Purpose - The purpose of this paper is to investigate the influence of composite coating structure on the reliability of adhesive flip chip joints. The need for conformal coating is considered, especially for medical applications, and medical sterilization is also considered.Design methodology approach - Two test lots were assembled and one of them was sterilized using gamma sterilization. Both test lots were coated first with epoxy and then with Parylene C, resulting in a composite coating structure. The reliability was studied using a constant humidity test and the failure analysis was performed with cross-sections and scanning electron microscopy analysis. These results were compared to earlier research results on conformal coatings.Findings - The reliability of both test lots proved to be good. The composite coating structure shields the joints from humidity and improves the reliability compared to non-coated test samples. When the conformal coating was compared to the pure Parylene C coated test lot, the reliability was almost the same. This leads to the conclusion that the epoxy layer in the composite coating structure has no value when long-term reliability is considered. Gamma sterilization does not greatly affect reliability. The epoxy coating under the Parylene C layer cracked during reliability testing.Originality value - The paper shows the influence of composite coating structure on the reliability of adhesive flip chip joints, particularly important in medical applications.
AbstractList Purpose - The purpose of this paper is to investigate the influence of composite coating structure on the reliability of adhesive flip chip joints. The need for conformal coating is considered, especially for medical applications, and medical sterilization is also considered. Design-methodology-approach - Two test lots were assembled and one of them was sterilized using gamma sterilization. Both test lots were coated first with epoxy and then with Parylene C, resulting in a composite coating structure. The reliability was studied using a constant humidity test and the failure analysis was performed with cross-sections and scanning electron microscopy analysis. These results were compared to earlier research results on conformal coatings. Findings - The reliability of both test lots proved to be good. The composite coating structure shields the joints from humidity and improves the reliability compared to non-coated test samples. When the conformal coating was compared to the pure Parylene C coated test lot, the reliability was almost the same. This leads to the conclusion that the epoxy layer in the composite coating structure has no value when long-term reliability is considered. Gamma sterilization does not greatly affect reliability. The epoxy coating under the Parylene C layer cracked during reliability testing. Originality-value - The paper shows the influence of composite coating structure on the reliability of adhesive flip chip joints, particularly important in medical applications.
Purpose The purpose of this paper is to investigate the influence of composite coating structure on the reliability of adhesive flip chip joints. The need for conformal coating is considered, especially for medical applications, and medical sterilization is also considered. Designmethodologyapproach Two test lots were assembled and one of them was sterilized using gamma sterilization. Both test lots were coated first with epoxy and then with Parylene C, resulting in a composite coating structure. The reliability was studied using a constant humidity test and the failure analysis was performed with crosssections and scanning electron microscopy analysis. These results were compared to earlier research results on conformal coatings. Findings The reliability of both test lots proved to be good. The composite coating structure shields the joints from humidity and improves the reliability compared to noncoated test samples. When the conformal coating was compared to the pure Parylene C coated test lot, the reliability was almost the same. This leads to the conclusion that the epoxy layer in the composite coating structure has no value when longterm reliability is considered. Gamma sterilization does not greatly affect reliability. The epoxy coating under the Parylene C layer cracked during reliability testing. Originalityvalue The paper shows the influence of composite coating structure on the reliability of adhesive flip chip joints, particularly important in medical applications.
Author Kellomäki, Minna
Kokko, Kati
Harjunpää, Hanna
Heino, Pekka
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Cites_doi 10.1109/TCAPT.2003.817640
10.1016/j.microrel.2008.10.016
10.1016/j.sna.2004.11.021
10.1109/TBME.1977.326115
10.1109/MMB.2006.251543
10.1108/09540910610717884
10.1109/TNSRE.2003.810431
10.1016/j.snb.2005.11.010
10.1109/HDP.2005.251392
10.1108/09540910910989376
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Issue 3
Keywords Coatings technology
Adhesives
Flipchips
Joining materials
Scanning electron microscopy
Failure analysis
Electronic component
Adhesive joint
Flip-chip
Durability
Reliability
Coatings
Medical application
Composite material
Coated material
Crack
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SubjectTerms Adhesives
Applied sciences
Coatings technology
Design. Technologies. Operation analysis. Testing
Electronics
Environmental protection
Epoxy coatings
Exact sciences and technology
Failure analysis
Flipchips
Humidity
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Integrated circuits
Joining
Joining materials
Medical equipment
Physics
Polymers
Protective coatings
Radiation
Scanning probe microscopes, components and techniques
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Semiconductors
Silicones
Studies
Temperature
Testing, measurement, noise and reliability
Title Composite coating structure in an implantable electronic device
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