Patent ID: 7361942
Filing Date: 2008-04-22
Classification: H01L

Abstract:
1. A semiconductor die, comprising: a) a semiconductor substrate diffused with a first material to give the substrate a first conductivity type, the substrate having a substrate surface; b) a buried layer selectively formed in the substrate surface and diffused with a second material to give the buried layer the opposite conductivity type as the substrate; c) an epitaxial layer formed on the substrate surface and on the buried layer, the epitaxial layer having the opposite conductivity type as the substrate, the epitaxial layer having an epitaxial surface distal from the substrate surface; d) a first diffused region selectively formed in the epitaxial layer through the epitaxial surface, the first diffused region having the same conductivity type as the epitaxial layer, the first diffused region having a first surface distal from the substrate surface, wherein the first diffused region extends from the first surface to the substrate surface; e) a second diffused region selectively formed in the first diffused region through the first surface thereof, the second diffused region having the opposite conductivity type as the first diffused region, the first diffused region and the second diffused region combine to form a first semiconductor junction; and f) a third diffused region selectively formed in the epitaxial layer through the epitaxial surface remote from the first diffused region, the third diffused region having the opposite conductivity type as the epitaxial layer, the epitaxial layer and the third diffused region forming a second semiconductor junction.