Definition

Sheet resistivity measures the resistance of a thin conductive film, expressed in ohms per square (Ω/□). To calculate an embedded resistor: R = sheet resistivity × (length ÷ width). Example: with 100 Ω/□ material, a resistor 2mm long and 0.5mm wide gives 100 × (2 ÷ 0.5) = 400Ω. A square resistor (length = width) always equals the sheet resistivity regardless of size. Available Ohmega-Ply materials range from 25 to 250 Ω/□. Choose higher sheet resistivity for large values in small areas, but note this reduces current handling capacity.