Thick film resistor failures are often caused by external environmental factors such as electrical and mechanical stresses and handling issues but seldom occur due to a failure of the resistive element itself. Failures are either classed as a degradation of performance or complete failure (usually as an open rather than a short circuit).
We consider several common causes of thick film resistor failure, many of which may not be immediately obvious to the circuit designer. Failure modes include:
· Mechanical stress