1 Features
• Ultra-low offset voltage: 10 μV
• Ultra-low drift: ±0.1 μV/°C
• High open-loop gain: 134 dB
• High common-mode rejection: 140 dB
• High power-supply rejection: 130 dB
• Low bias current: 1-nA maximum
• Wide supply range: ±2 V to ±18 V
• Low quiescent current: 800 μA/amplifier
• Single, dual, and quad versions
• Replaces OP-07, OP-77, and OP-177
• For similar performance with ±40-V overvoltage
protection, see the OPA2206

2 Applications
• Analog input module
• Weigh scale
• Temperature transmitter
• Pressure transmitter
• Data acquisition (DAQ)
• Lab and field instrumentation
• Battery test

3 Description
The OPAx277 series of precision operational
amplifiers replace the industry standard OP-177. The
OPAx277 devices offer improved noise, wider output
voltage swing, and are twice as fast with half the
quiescent current. Features include ultra-low offset
voltage and drift, low bias current, high commonmode
rejection, and high power supply rejection.
The OPAx277 operate from ±2-V to ±18-V supplies
with excellent performance. Unlike most op amps that
are specified at only one supply voltage, the OPAx277
series is specified for real-world applications; a single
limit applies over the ±5-V (10-V) to ±15-V (30-V)
supply range. High performance is maintained as the
amplifiers swing to the specified limits. Because the
initial offset voltage (±20 μV, maximum) is so low,
user adjustment is usually not required. However, the
single version (OPA277) provides external trim pins
for special applications.
The OPAx277 are easy to use and free from phase
inversion and the overload problems found in some
other op amps. These devices are unity-gain stable
and provide excellent dynamic behavior over a wide
range of load conditions. Dual and quad versions
feature completely independent circuitry for lowest
crosstalk and freedom from interaction, even when
overdriven or overloaded.