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OPA991 ACTIVE Single, 40-V, 4.5-MHz, low-power operational amplifier Rail-to-rail I/O, wider supply range (2.7 V to 40 V), higher GBW (4.5 MHz), lower offset voltage (0.75 mV), lower noise (10.8 nV/√Hz)

Product details

Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 36 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 2.7 Rail-to-rail In to V-, Out GBW (typ) (MHz) 3 Slew rate (typ) (V/µs) 1.5 Vos (offset voltage at 25°C) (max) (mV) 1.8 Iq per channel (typ) (mA) 0.475 Vn at 1 kHz (typ) (nV√Hz) 14 Rating Catalog Operating temperature range (°C) -40 to 125 Offset drift (typ) (µV/°C) 0.3 Features EMI Hardened, Small Size Input bias current (max) (pA) 15 CMRR (typ) (dB) 120 Iout (typ) (A) 0.025 Architecture CMOS Input common mode headroom (to negative supply) (typ) (V) -0.1 Input common mode headroom (to positive supply) (typ) (V) -2 Output swing headroom (to negative supply) (typ) (V) 0.03 Output swing headroom (to positive supply) (typ) (V) -0.35
Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 36 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 2.7 Rail-to-rail In to V-, Out GBW (typ) (MHz) 3 Slew rate (typ) (V/µs) 1.5 Vos (offset voltage at 25°C) (max) (mV) 1.8 Iq per channel (typ) (mA) 0.475 Vn at 1 kHz (typ) (nV√Hz) 14 Rating Catalog Operating temperature range (°C) -40 to 125 Offset drift (typ) (µV/°C) 0.3 Features EMI Hardened, Small Size Input bias current (max) (pA) 15 CMRR (typ) (dB) 120 Iout (typ) (A) 0.025 Architecture CMOS Input common mode headroom (to negative supply) (typ) (V) -0.1 Input common mode headroom (to positive supply) (typ) (V) -2 Output swing headroom (to negative supply) (typ) (V) 0.03 Output swing headroom (to positive supply) (typ) (V) -0.35
SOIC (D) 8 29.4 mm² 4.9 x 6 SOT-23 (DBV) 5 8.12 mm² 2.9 x 2.8 SOT-5X3 (DRL) 5 2.56 mm² 1.6 x 1.6
  • Supply range: 2.7 to 36 V, ±1.35 V to ±18 V
  • Low noise: 14 nV/√Hz
  • Low offset drift: ±0.3 µV/°C (typical)
  • RFI filtered inputs
  • Input range includes the negative supply
  • Input range operates to positive supply
  • Rail-to-rail output
  • Gain bandwidth: 3 MHz
  • Low quiescent current: 475 µA per amplifier
  • High common-mode rejection: 120 dB (typical)
  • Low-input bias current: 8 pA
  • Industry-standard packages:
    • 8-pin SOIC
    • 8-pin MSOP
    • 14-pin TSSOP
  • Micro packages:
    • Single in SOT-553
    • Dual in VSSOP-8
  • Supply range: 2.7 to 36 V, ±1.35 V to ±18 V
  • Low noise: 14 nV/√Hz
  • Low offset drift: ±0.3 µV/°C (typical)
  • RFI filtered inputs
  • Input range includes the negative supply
  • Input range operates to positive supply
  • Rail-to-rail output
  • Gain bandwidth: 3 MHz
  • Low quiescent current: 475 µA per amplifier
  • High common-mode rejection: 120 dB (typical)
  • Low-input bias current: 8 pA
  • Industry-standard packages:
    • 8-pin SOIC
    • 8-pin MSOP
    • 14-pin TSSOP
  • Micro packages:
    • Single in SOT-553
    • Dual in VSSOP-8

The OPA171, OPA2171, and OPA4171 (OPAx171) are a family of 36-V, single-supply, low-noise operational amplifiers with the ability to operate on supplies ranging from 2.7 V (±1.35 V) to 36 V (±18 V). 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 2.7 to 36 V. Input signals beyond the supply rails do not cause phase reversal. The OPAx171 family is stable with capacitive loads up to 300 pF. The input can operate 100 mV below the negative rail and within 2 V of the top rail during normal operation. These devices can operate with full rail-to-rail input 100 mV beyond the top rail, but with reduced performance within 2 V of the top rail.

The OPAx171 series of operational amplifiers are specified from –40°C to +125°C.

The OPA171, OPA2171, and OPA4171 (OPAx171) are a family of 36-V, single-supply, low-noise operational amplifiers with the ability to operate on supplies ranging from 2.7 V (±1.35 V) to 36 V (±18 V). 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 2.7 to 36 V. Input signals beyond the supply rails do not cause phase reversal. The OPAx171 family is stable with capacitive loads up to 300 pF. The input can operate 100 mV below the negative rail and within 2 V of the top rail during normal operation. These devices can operate with full rail-to-rail input 100 mV beyond the top rail, but with reduced performance within 2 V of the top rail.

The OPAx171 series of operational amplifiers are specified from –40°C to +125°C.

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Technical documentation

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Type Title Date
* Data sheet OPAx171 36-V, Single-Supply, SOT-553, General-Purpose Operational Amplifiers datasheet (Rev. G) PDF | HTML 22 May 2020
Application note Using An Op Amp for High-Side Current Sensing (Rev. A) PDF | HTML 07 Dec 2021
Technical article What is an op amp? 21 Jan 2020
Circuit design Noninverting amplifier circuit (Rev. A) PDF | HTML 31 Jan 2019
Technical article How to lay out a PCB for high-performance, low-side current-sensing designs 06 Feb 2018
Technical article Low-side current sensing for high-performance cost-sensitive applications 22 Jan 2018
Technical article Voltage and current sensing in HEV/EV applications 22 Nov 2017
E-book The Signal e-book: A compendium of blog posts on op amp design topics 28 Mar 2017
Application note OPA171 EMI Immunity Performance 29 Mar 2016
More literature Precision Amplifier Quickstart Kit brochure (Rev. A) 13 Jan 2015
Application note Compensate Transimpedance Amplifiers Intuitively (Rev. A) 30 Mar 2005

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

DIP-ADAPTER-EVM — DIP adapter evaluation module

Speed up your op amp prototyping and testing with the DIP adapter evaluation module (DIP-ADAPTER-EVM), which provides a fast, easy and inexpensive way to interface with small surface-mount ICs. You can connect any supported op amp using the included Samtec terminal strips or wire them (...)

User guide: PDF
Not available on TI.com
Evaluation board

DIYAMP-EVM — Universal do-it-yourself (DIY) amplifier circuit evaluation module

The DIYAMP-EVM is an evaluation module (EVM) family that provides engineers and do it yourselfers (DIYers) with real-world amplifier circuits, enabling you to quickly evaluate design concepts and verify simulations. It is available in three industry-standard packages (SC70, SOT-23 and SOIC) (...)

User guide: PDF | HTML
Simulation model

OPAy171 Family PSpice Model (Rev. B)

SBOM440B.ZIP (14 KB) - PSpice Model
Simulation model

OPAy171 Family TINA-TI Reference Design (Rev. C)

SBOM442C.TSC (357 KB) - TINA-TI Reference Design
Simulation model

OPAy171 Family TINA-TI Spice Model (Rev. B)

SBOM441B.ZIP (9 KB) - TINA-TI Spice Model
Calculation tool

ANALOG-ENGINEER-CALC — Analog engineer's calculator

The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)
Design tool

CIRCUIT060013 — Inverting amplifier with T-network feedback circuit

This design inverts the input signal, VIN, and applies a signal gain of 1000 V/V or 60 dB. The inverting amplifier with T-feedback network can be used to obtain a high gain without a small value for R4 or very large values for the feedback resistors.
Design tool

CIRCUIT060015 — Adjustable reference voltage circuit

This circuit combines an inverting and non-inverting amplifier to make a reference voltage adjustable from the negative of the input voltage up to the input voltage. Gain can be added to increase the maximum negative reference level.
Design tool

CIRCUIT060022 — Noninverting amplifier circuit

This design amplifies the input signal, Vi, with a signal gain of 10 V/V. The input signal may come from a high-impedance source (for example, MΩ) because the input impedance of this circuit is determined by the extremely high input impedance of the op amp (for example, GΩ). The (...)
Design tool

CIRCUIT060074 — High-side current sensing with comparator circuit

This high-side, current sensing solution uses one comparator with a rail-to-rail input common mode range to create an over-current alert (OC-Alert) signal at the comparator output (COMP OUT) if the load current rises above 1 A. The OC-Alert signal in this implementation is active low. So when the (...)
Design tool

SBOC493 Simulation for Noninverting Amplifier Circuit

Supported products & hardware

Supported products & hardware

Products
General-purpose op amps
OPA171 Single, 36-V, 3-MHz, low-power operational amplifier
Precision op amps (Vos<1mV)
OPA191 Low-Power, Precision, 36-V, e-trim CMOS Amplifier
Hardware development
Design tool
CIRCUIT060022 Noninverting amplifier circuit
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
Reference designs

TIDC-EVSE-WIFI — Wi-Fi Enabled Level 1 and Level 2 Electric Vehicle Service Equipment Reference Design

The TIDC-EVSE-Wi-Fi® verified reference design details how to implement J1772-compliant level 1 and level 2 electric vehicle service equipment (EVSE) with added Wi-Fi functionality. The CC3100 network processor enables highly-embedded devices like the EVSE to easily connect to an existing (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDC-EVSE-NFC — NFC Authentication for an EV Charging Station (Pile) Reference Design

The TIDC-EVSE-NFC reference design showcases a straightforward integration of TI’s NFC technology with an existing EVSE platform to enable user authentication. The NFC standard comprises many different sub-technologies and working groups, making integration into a specific system (...)
Design guide: PDF
Schematic: PDF
Package Pins Download
SOIC (D) 8 View options
SOT-23 (DBV) 5 View options
SOT-5X3 (DRL) 5 View options

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