We discuss the opportunities for Nanoelectronic devices based on reson
ant tunneling to impact integrated circuit (IC) technology. We believe
that resonant tunneling diodes (RTDs) integrated with conventional co
mpound semiconductor transistors will be the first opportunity for pro
ducts. The development of silicon heterostructure technology should pe
rmit RTDs to augment CMOS ICs by permitting novel circuit applications
that will have speed and functional density advantages. In our view,
the most promising avenue for downscaling to exist beyond CMOS will be
Quantum Dot IC technology. Numerous challenges for nanotechnology exi
st along each step of these paths.