RELIABLE SCREEN PRINTED RESISTORS WITH PHOTODEFINED DIMENSIONS
Original Publication Date: 2000-May-01
Included in the Prior Art Database: 2002-Sep-16
Polymer thick film (PTF) resistors terminated directly to etched copper terminals on a printed circuit board exhibit substantial resistance increase under temperature/humidity stress. The problem becomes acute for low aspect ratio resistors, because the resistance of the copper/carbon paste interface can be of the same order as the bulk resistance.