Patent ID: 6930870
Filing Date: 2005-08-16
Classification: H01L,H03K

Abstract:
1. A semiconductor device with protective functions having two semiconductor device components inserted between a power source and a load, in each of which an electric current flowing between a first main terminal and a second main terminal is controlled in accordance with a control voltage applied between a control terminal and said second main terminal, said second main terminals of said two semiconductor device components being commonly connected to each other, said control terminals of said two semiconductor device components being commonly connected to each other, and each of said semiconductor device components comprising: a main transistor of a voltage driven type which is turned to ON or OFF in accordance with said control voltage, said main transistor being inserted between said first main terminal and said second main terminal; a protective transistor of a voltage driven type inserted between a control electrode of said main transistor and a reference electrode of said main transistor; a protective circuit which protects said main transistor by said protective transistor when abnormality is detected thereby, said protective circuit betng inserted between said first main terminal and said second main terminal; a detecting transistor of a voltage driven type which is turned to ON or OFF in accordance with said control voltage, said detecting transistor being inserted between said first main terminal and said protective circuit; an impedance element inserted between said protective transistor and a junction connecting said control terminal to a control electrode of said detecting transistor; and a non-return diode inserted between said second main terminal and a junction connecting said protective circuit to a reference electrode of said protective transistor, in such a manner that said non-return diode has polarity to prevent a current from flowing from said second main terminal to said protective transistor and said protective circuit.