SEMICONDUCTOR DEVICE

摘要

Disclosed is a semiconductor device wherein characteristic fluctuation of an analog circuit that requires trimming adjustment is suppressed small in long-term storage after package sealing and reflow. On an embedded oxide film (13) of a semiconductor substrate (44), an analog circuit having a trimming mechanism for output adjustment is formed. A trench structure is formed to surround at least one of elements constituting the analog circuit, and the trench structure is provided with an insulating oxide layer (11) having a hollow structure (12).