View hm8521 hm8522 hm8524 datasheet:

HM8521, HM8522, HM8524 3.4μA, 90kHz, RRIO CMOS Operational Amplifiers General Description The HM8521 (single), HM8522 (dual) and HM8524 (quad) are ultra-low power operational amplifiers that provide 90kHz bandwidth with only 3.4μA quiescent current. These rail-to-rail input and output amplifiers are specifically designed for battery-powered applications. The input common-mode voltage range extends 300mV beyond the power- supply rails and the output swings to only 6mV of the rails, maintaining wide dynamic range. Unlike some micro-power op-amps, these parts are unity-gain stable. The HM852x family features a low input bias current that allows the use of large source and feedback resistors. The HM852x op-amps are specified for single