1 Features
• Supply range: 2.7V to 36V, ±1.35V to ±18V
• Low noise: 14nV/√ Hz
• Low offset drift: ±0.3μV/°C (Typical)
• RFI filtered inputs
• Input range includes the negative supply
• Input range operates to positive supply
• Rail-to-rail output
• Gain bandwidth: 3MHz
• Low quiescent current: 475μA per amplifier
• High common-mode rejection: 120dB (typical)
• Low-input bias current: 8pA
• Industry-standard packages:
– 5-pin SOT-23
– 8-pin SOIC
– 14-pin TSSOP
• microPackages:
– Single in SOT-553
– Dual in VSSOP-8

2 Applications
• Tracking amplifier in power modules
• Merchant power supplies
• Transducer amplifiers
• Bridge amplifiers
• Temperature measurements
• Strain gauge amplifiers
• Precision integrators
• Battery-powered instruments
• Test equipment

3 Description
The OPA171, OPA2171, and OPA4171 (OPAx171)
are a family of 36V, single-supply, low-noise
operational amplifiers with the ability to operate on
supplies ranging from 2.7V (±1.35V) to 36V (±18V).
These devices are available in micro-packages
and offer low offset, drift, and bandwidth with low
quiescent current. The single, dual, and quad versions
all have identical specifications for maximum design
flexibility.
Unlike most operational amplifiers, which are
specified at only one supply voltage, the OPAx171
family is specified from 2.7V to 36V. Input signals
beyond the supply rails do not cause phase reversal.
The OPAx171 family is stable with capacitive loads
up to 300pF. The input can operate 100mV below
the negative rail and within 2V of the top rail during
normal operation. These devices can operate with full
rail-to-rail input 100mV beyond the top rail, but with
reduced performance within 2V of the top rail.
The OPAx171 series of operational amplifiers are
specified from –40°C to +125°C.