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.