The CA3440 BiMOS op amp features gate protected PMOS transistors in the input circuit to provide very high input impedance, very low input currents (less than 10pA). This device operates at total supply voltages from 5V to 15V and can be operated over the temperature range from -55oC to 125oC. The virtues are programmability and very low standby power consumption (300nW). This operational amplifier is internally phase compensated to achieve stable operation in the unity gain follower configuration. Terminals are also provided for use in applications requiring input offset voltage nulling. The use of PMOS in the input stage results in common mode input voltage capability down to 0.5V below the negative supply terminals, an important attribute for single supply applications. The output stage uses MOS complementary source follower form which permits moderate load driving capability (10k) at very low standby currents (50nA).