Pan Pacific Symposium Conference Proceedings


Author: Mitsuru Mura
Company: Sony Corporation
Date Published: 2/2/1999   Conference: Pan Pacific Symposium

Abstract: Epoxy resin adhesive is an extremely important element for ensuring the reliability of connection in the resin pressure contact flip-chip method. Up to now, it was considered sufficient, for the pressure contact flip-chip method, to use the same epoxy resin adhesive as in the solder-bonding flip-chip attach (FCA) method. In other words, the physical properties of such as epoxy resin adhesive had been examined in order to ease thermal stress generated by the difference in thermal expansion between the chip and the substrate. Accordingly, the coefficient of thermal expansion (CTE) of the epoxy resin adhesive used in the solder-bonding FCA method is designed to be the same as that of the bump solder. However, unlike in the solder-bonding FCA method, a flip-chip bonding method, which uses epoxy resin adhesive, does not bond bumps to the substrate land and retains a connection through contact between bumps and the substrate land. Since the breaking mode in the heat cycle is different between the flip-chip bonding method and the solder-bonding FCA method, effective thermal fatigue life cannot be achieved when the same epoxy resin adhesive as used in the solder-bonding FCA method is used in the flip-chip bonding method.

In this study, the relationship between the adhesive resin’s coefficient of thermal expansion and its thermal fatigue life (heat cycle test) in a resin pressure contact flip chip is investigated.

Keywords: flip chip, pressure contact flip-chip method, heat cycle test.

Members download articles for free:

Not a member yet?

What else do you get when you join SMTA? Read about all of the benefits that go along with membership.

Notice: Sharing of articles is restricted to just your immediate work group. Downloaded papers should not be stored on an external network or shared on the internet.


SMTA Headquarters
6600 City West Parkway, Suite 300
Eden Prairie, MN 55344 USA

Phone +1 952.920.7682
Fax +1 952.926.1819