Chip Resistor Failure Analysis
The most common resistor failure mechanism seen at SEM Lab, Inc. is the corrosion of the silver thick film conductor at the termination due to atmospheric corrosion by sulfur (e.g. H2S). The corrosion causes the resistance of the chip resistor to increase and ultimately results in an open circuit.
Chip resistor failures and a cross-sectional image of a resistor are shown below. More information about chip resistor corrosion can be found here.
Other device failure analysis information:
chip resistor Failure Analysis
The nickel plating associated with the termination of this chip resistor had peeled back slightly, and the silver thickfilm conductor had corroded open.
Failure at laser trim of a chip resistor. The failure event vaporized alumina, silver conductor, ruthenium oxide resistor material and the cover glass layer.