| 257 / | HD | ACTIVE SOLID-STATE DEVICES (E.G., TRANSISTORS, SOLID-STATE DIODES) |
| 107 | DF | REGENERATIVE TYPE SWITCHING DEVICE (E.G., SCR, COMFET, THYRISTOR) {19} |
| 133 | DF | .~ Combined with field effect transistor {3} |
| 139 | DF | .~.~ With extended latchup current level (e.g., COMFET device) {6} |
| 144 | | .~.~.~ Cathode emitter or cathode electrode feature |