| 摘要 |
PURPOSE:To eliminate the unevenness of gate-trigger currents by a simple structure by forming the fifth n layer of which the fourth n layer is extended under a gate electrode. CONSTITUTION:A p2 layer between an n2 layer 4 and an n4 layer 6 is surrounded, the n4 layer is extended so as to contact with an end section of a gate electrode 7, and the fifth n layer (n5) 10 is formed. Thus, gate currents A flowing through the p2 layer just under the n2 layer are utilized for the ignition of an SCR of p1-n1-p2-n5. According to this constitution, gate-trigger currents in the case when gate electrode potential is negative and the second main electrode potential is positive can be reduced as compared to the case when only gate currents flowing through the p2 layer just under the n4 layer contribute to the ignition of the first SCR as seen in conventional triacs. Trigger currents are also uniformalized. |
