The ERF-2030 is a mechanical drop in replacement for the 2SC2166, 2SC1969, and 2SC2312. This means that the ERF-2030 features a TO-220 package with the same pinout configuration as the 2SC2166,2SC1969,and 2SC2312. Therefore, NO mechanical modifications to the ERF-2030 are necessary for most installations. EKL Components manufactures a series of companion parts to the ERF-2030. The EN-1230, EN-369DR, and EN-369FN are available to make radio modifications easier and maximize performance. Although the ERF2030 is a drop in replacement it does need a forward bias voltage on the gate to make them work, and the companion parts EN-1230,EN-369DR and EN-369FN make this possible.