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.