The AD8539ARZ from Analog Devices is a Power Operational Amplifier with Supply Voltage 2.7 to 5.5 V, Input Offset Voltage 0.005 to 0.03 mV, Input Bias Current 15 to 1000 pA, Input Offset Current 20 to 400 pA, Input Offset Voltage Drift 0.03 to 0.1 µV/°C. Tags: Surface Mount, Precision Op Amp. More details for AD8539ARZ can be seen below.