AEC-Q200 qualified. PWR220T-20 Series. The PWR220T-20 Series from Bourns® is a TO-220 style power resistor manufactured using thick film on alumina ceramic technology. Product Application Information. TO-220 housing Low inductance Resistor electrically isolated from the backplate High power rating. These power resistors are AEC-Q200 qualified and suitable for automotive applications. Other applications include power supplies, test and measurement, motor drives and rectifiers.