The OPA391 and OPA2391 ( OPAx391) feature a unique combination of high bandwidth (1 MHz) along with very-low quiescent current (24 µA) in high-precision amplifiers. These features combined with rail-to-rail input and output make these devices an exceptional choice in high-gain, low-power applications. Ultra-low input bias current of 10 fA, only 45 µV of offset (maximum), and 1.2 µV/°C of drift over temperature help maintain high precision in ratiometric and amperometric sensor front ends that have demanding low-power requirements.

The OPAx391 use Texas Instrument’s proprietary e‑trim™ operational amplifier technology, enabling a unique combination of ultra-low offset and low input offset drift without the need for any input switching or auto-zero techniques. The CMOS-based technology platform also features a modern, robust output stage design that is tolerant of high output capacitance, alleviating stability problems that are common in typical low-power amplifiers.

• Low IQ: 24 µA

• Gain bandwidth product: 1 MHz

• Low input bias current: 10 fA

• Low offset voltage: ±45 µV (maximum)

• Low drift: ±1.2 µV/°C

• Low supply voltage operation: 1.7 V to 5.5 V

• Input common mode range ±100 mV beyond rail

• Fast slew rate: 1 V/µs

• High load capacitance drive

• High output current drive: 60 mA

• Rail-to-rail output

• EMI/RFI filtered inputs

• Small package options: SC-70, DSBGA