thyristor

1. (electronics) A semiconductor diode having an extra "gate" terminal to switch it on.Examples: "In calling it a "Thyristor", Mr. Warder was following a growing practice which takes account of the fact that in years to come the controlled rectifier may be made of other materials than silicon."; "Figure 1.4 shows a modern thyristor encapsulated in a presspack housing and Figure 1.5 illustrates a typical interdigitated gate geometry in a high-power thyristor; the black areas indicate silicon ( Si0₂ ) and the white areas the Al metallisation."