OPA810 Single-Channel Operational Amplifiers Texas Instruments OPA810 Single-Channel Operational Amplifiers offer a field-effect transistor (FET)-input, voltage-feedback, and bias current in the picoampere (pA) range. The OPA810 Op Amp is unity-gain stable with a small signal and a unity-gain bandwidth of 140MHz and provides excellent DC precision and dynamic AC performance at a low quiescent current (IQ) of 3.7mA per channel.