1 Features
1• Low offset voltage: 10 μV (maximum)
• Zero drift: 0.001 μV/°C
• Low noise: 15 nV/√Hz
• PSRR: 160 dB
• CMRR: 140 dB
• AOL: 160 dB
• Quiescent Current: 100 μA
• Wide supply voltage: ±2.25 V to ±18 V
• Rail-to-rail output operation
• Input includes negative rail
• Low bias current: 100 pA (typical)
• EMI filtered inputs
• Microsize packages

2 Applications
• Analog input module
• Mixed module (AI, AO, DI, DO)
• Flow transmitter
• Pressure transmitter
• Test and measurement
• Semiconductor test
• Semiconductor manufacturing
• Process analytics (pH, gas, concentration, force,
and humidity)

3 Description
The OPAx187 series operational amplifiers use autozeroing
techniques to simultaneously provide lowoffset
voltage (1 μV), and near zero drift over time
and temperature. These miniature, high-precision,
low-quiescent current amplifiers offer high-input
impedance and rail-to-rail output swing within 5 mV of
the rails into high-impedance loads. The input
common-mode range includes the negative rail.
Either single or dual supplies can be used in the
range of 4.5 V to 36 V (±2.25 V to ±18 V).
The single version OPAx187 device is available in
microsize 8-pin VSSOP, 5-pin SOT-23, and 8-pin
SOIC packages. The dual version is offered in 8-pin
VSSOP and 8-pin SOIC packages. The quad version
is offered in 14-pin SOIC, 14-pin TSSOP, and 16-pin
WQFN packages. All versions are specified for
operation from –40°C to +125°C.