The MCP639-E/ML from Microchip Technology is a Power Operational Amplifier with Supply Voltage 2.5 to 5.5 V, Input Offset Voltage -8 to 8 mV, Input Bias Current 0.000005 mA, Quiescent Current 1200 to 3600 µA, Input Offset Current -2 to 2 pA. Tags: Surface Mount, General Purpose Op Amp. More details for MCP639-E/ML can be seen below.