Abstract: A switching point, for telephone switching, and a matrix are provided. They use thermoconductor materials i.e. materials capable of a sudden change in conductivity at a certain temperature, as V O.sub.2. The basic switching point comprises a resistive layer with a significant Joule effect, an insulating layer and a layer of V O.sub.2, deposited one on top of the other on the same substrate, using thin layer technology. Two elements connected in series enable a logic inverter to be formed. Three thermoconductive elements enable a telephone wire switching point to be formed between two conductors with a middle point connected to earth.