1 Features
• Low offset voltage: ±5 μV
• Low offset voltage drift: ±0.1 μV/°C
• Low noise: 15 nV/√ Hz at 1 kHz
• High common-mode rejection: 140 dB
• Low bias current: ±5 pA
• Rail-to-rail input and output
• Wide bandwidth: 2.5-MHz GBW
• High slew rate: 5 V/μs
• Low quiescent current: 140 μA per amplifier
• Wide supply: ±2.25 V to ±18 V, 4.5 V to 36 V
• EMI/RFI filtered inputs
• Differential input voltage range to supply rail
• High capacitive load drive capability: 1 nF
• Industry standard packages:
– Single in SOIC-8, SOT-5, and VSSOP-8
– Dual in SOIC-8 and VSSOP-8
– Quad in SOIC-14, TSSOP-14, and WQFN-16

2 Applications
• Analog input module
• Mixed module (AI, AO, DI, DO)
• Data acquisition (DAQ)
• Source measurement unit (SMU)
• Pressure transmitter
• Train control and management systems
• Lab and field instrumentation

3 Description
The OPAx191 family (OPA191, OPA2191, and
OPA4191) is a new generation of 36-V, e-trim™
operational amplifiers.
These devices offer outstanding dc precision and
ac performance, including rail-to-rail input/output, low
offset voltage (±5 μV, typ), low offset drift (±0.2 μV/°C,
typ), and 2-MHz bandwidth.
Unique features, such as differential input-voltage
range to the supply rail, high output current (±65 mA),
high capacitive load drive of up to 1 nF, and high
slew rate (5 V/μs), make the OPAx191 a robust, highperformance
operational amplifier for high-voltage
industrial applications.
The OPAx191 family of op amps is available in
standard packages and is specified from –40°C to
+125°C.