Heatsink DOx type for TO-202 package. With no added hardware. Trim, low profile, minimum space. Thermal resistance value is based on a 75°C rise in natural convection. HB brand Info, Mechanical Outline Drawing Part# Finish Black Anodize Black DO2 Anodize Black DO3 Anodize DO1 A size Therm. Cross mm resist. (Aavid) (inch) (°C/W) 12.7 24.0 577404b00000 (.5) 9.52 27.2 577304b00000 (.375) 6.35 32.0 576904b00000 (.25) Thermal Curves DO1: DO2 & DO3: