1 Features

• Low IQ: 24μA

• Gain bandwidth product: 1MHz

• Low input bias current: 10fA

• Low offset voltage: ±45μV (maximum)

• Low drift: ±1.2μV/°C

• Low supply voltage operation: 1.7V to 5.5V

• Input common mode range ±100mV beyond rail

• Fast slew rate: 1V/μs

• High load capacitance drive

• High output current drive: 60mA

• Rail-to-rail output

• EMI and 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, OPA2391, and OPA4391 (OPAx391)

devices feature a unique combination of high

bandwidth (1MHz) along with very-low quiescent

current (24μA) in high-precision amplifiers. These

features combined with rail-to-rail input and output

make these devices an exceptional choice in highgain,

low-power applications. Ultra-low input bias

current of 10fA, only 45μV of offset (maximum), and

1.2μV/°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 Instruments' 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.