A4 Conference proceedings

Acoustic detection of cracks and delamination in Multilayer Ceramic Capacitors


Publication Details
Authors: Levikari Saku, Kärkkäinen Tommi, Silventoinen Pertti, Andersson Caroline, Tamminen Juha
Publication year: 2017
Language: English
Title of parent publication: 2017 IEEE 11th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED)
Start page: 622
End page: 627
Number of pages: 6
ISBN: 978-1-5090-0410-2
eISBN: 978-1-5090-0409-6
JUFO-Level of this publication: 1
Open Access: Not an Open Access publication

Abstract

Multilayer Ceramic Capacitors (MLCC) are the most widely used capacitor
type in the electronics industry. However, the brittle ceramic
dielectric makes MLCCs prone to mechanical damage. Manufacturing defects
or damage during board assembly may cause a capacitor to prematurely
fail during its operational life. Here, we demonstrate fast and
non-destructive acoustic screening of MLCCs. Soldered 2220-sized MLCCs
were subjected to AC voltage frequency sweeps, causing them to vibrate
mechanically. Acoustic responses of the capacitors were measured before
and after subjecting the test circuit board to severe bending. The
results show that cracks and delaminations caused by bending induce
characteristic changes in the capacitors' acoustic response.


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Last updated on 2018-19-10 at 07:55