is 50 u03c9 and the resistance value of each diode element when conductive is 8 u03c9 as will be understood from table 1 and fig5 in case of the no diode circuit configuration shown in fig4 a the entire applied esd current i esd flows through the mr element as mr current i mr in case of the conventional circuit configuration shown in fig4 b the mr current i mr will exceed 20 ma and the pin inversion will occur when the esd current i esd becomes larger than about 150 ma whereas in case of the circuit configuration shown in fig4 c with the two diode elements 41 and 42 connected toward one direction in parallel with the mr element until the esd current i esd becomes larger than about 270 ma the mr current i mr never exceeds 20 ma and thus pin inversion due to the esd current never occurs also in case of the circuit configuration shown in fig4 d with the three diode elements 41 u2013 43 connected toward one direction in parallel with the mr element even when the esd current i esd becomes larger than about 300 ma the mr current i mr never exceeds 20 ma and.