High-power resistors come in TO-220/247 pkgs

The TR series of 20- to 50-W resistors come in TO-220 packages. They are also available in 100-W versions in a TO-247 package. For both types, the power rating is with a heat sink; without a heat sink, the power rating is about 3.5 W. The non-inductive and RoHS-compliant devices are available with tolerances from 0.5% to ±10%, TCR as low as 50 ppm, and rated voltage is 350 Vdc.

The resistors are power de-rated from 25°C to zero watts at 150°C or 175°C case temperature. TR30/35/50H/100 versions have a single-screw mounting hole. An example part number is the 50-W TR50JBC22R0 22-Ω, ±5%, 50-ppm TCR device in a TO-220 package. This resistor costs $1.66 ea/1,000.