Switch array circuit and system using programmable via structures with phase change materials

A switch unit array comprising:

• a plurality of programmable via structures, each programmable via structure including a first phase change material via directly contacting a bottom surface of a heating element and a second phase change material via directly contacting an upper surface of said heating element, said programmable via structure further including a first terminal in contact with a first portion of said heating element, a second terminal in contact with a second portion of said heating element, a third terminal in contact with said first phase change material via, and a fourth terminal in contact with said second phase change material via;
• a first circuit block in contact with one of said third and fourth terminals;
• a second circuit block in contact with the third or fourth terminal not contacting said first circuit block;
• a source region of a first field effect transistor in contact with one of said first and second terminals;
• and a drain region of a second field effect transistor in contact with the first or second terminal that is not contacting said source region of said first field effect transistor.