90 kHz CMOS op-amp for low-frequency sensor conditioning
The ROHM BU7421SG-TR is a single-channel CMOS operational amplifier designed for applications where power consumption and signal fidelity at low frequencies matter more than raw speed. The 8.5 µA supply current per channel keeps the power budget tight, and the rail-to-rail output swing lets you drive an ADC input directly without an extra gain stage.
Input bias and offset — DC accuracy for precision loops
With a 1 pA typical input bias current and 1 mV input offset voltage, the BU7421SG-TR handles high-impedance sources like pH probes or piezoelectric sensors without loading the signal. The 8 mA output drive per channel is enough to swing a small relay or drive a 2 kΩ load to the rails, but not intended for heavy capacitive loads — keep the load capacitance under a few hundred picofarads unless you add a series resistor.