1 Features

• 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

2 Applications

• Portable electronics

• Flow transmitter

• Blood glucose monitor

• Process analytics (pH, gas, force, humidity)

• Temperature transmitter

• Pressure transmitter

• Medical sensor patches

• Building automation

• Wearable fitness and activity monitor

• Gas detector

• Analog security camera

3 Description

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.