a temperature detector circuit using a mos transistor capable of reducing manufacture variation of a mobility and realizing stable output characteristics which are not affected by temperature dependency may be offered . in one example , the temperature detector circuit includes a pair of depression type transistors to output a voltage which is proportional to temperature from a connecting point of a sauce of a first transistor and a drain of a second transistor . the transistors are the same conducted type of current and are formed in different channel size , which are connected between power supplies in series , and have a configuration in which first transistor &# 39 ; s gate and sauce are connected each other and a first transistor &# 39 ; s drain is connected with a second power supply and second transistor &# 39 ; s gate and drain are connected each other and a second transistor &# 39 ; s sauce is connected with a first power supply .