| 摘要 |
The invention concerns a diac comprising a highly-doped substrate (20) of a first type of conductivity, a lightly-doped epitaxial layer (22) of the second type of conductivity including in the neighbourhood of the substrate (20) a more highly-doped part (21), a highly-doped region (24) of the first type of conductivity on the side of the upper surface of the epitaxial layer, a region (23) of the second type of conductivity more doped than the epitaxial layer beneath the region (24) of the first type of conductivity and not overlapping relative thereto, a channel retaining ring (25) of the second type of conductivity more highly doped than the epitaxial layer, outside the first region, a wall (26) of the first type of conductivity outside said ring, joining the substrate. |
