Tracopower ten 40 series 40w dc dc converters tracopower ten 40 1231 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 1231 40w dc dc converter 9 18v dc in 5v 6a12v 04a out