Abstract: A design structure embodied in a machine readable medium used in a design process. The design structure includes a first sub-collector formed in an upper portion of a substrate and a lower portion of a first epitaxial layer, and a second sub-collector formed in an upper portion of the first epitaxial layer and a lower portion of a second epitaxial layer. The design structure additionally includes a reach-through structure connecting the first and second sub-collectors, and an N-well formed in a portion of the second epitaxial layer and in contact with the second sub-collector and the reach-through structure. Also, the design structure includes N+ diffusion regions in contact with the N-well, a P+ diffusion region within the N-well, and shallow trench isolation structures between the N+ and P+ diffusion regions.