Tracopower ten 40 series 40w dc dc converters tracopower ten 40 1222 these 40w dc dc converters from the tracopower ten 40 series offer high power density in a 51 x 51 x 10mm metal case with a wide 21 input range these converters provide a high degree of efficiency tracopower ten 40 1222 40w dc dc converter 9 18v dc in 12v dc 18a out