Texas Instruments OPA2171AIDGKR

Overview

OPA2171AIDGKR from Texas Instruments is a dual-channel, 36V single-supply operational amplifier in a 5-pin SOT-553 package, featuring 3MHz gain bandwidth, 14nV/√Hz input voltage noise, ±0.3µV/°C offset drift (typ), rail-to-rail output, and operation from 2.7V to 36V. It serves precision signal conditioning in battery-powered instruments and transducer amplification where low quiescent current (475µA per amplifier) and wide supply range are critical.

For engineers reviewing the OPA2171AIDGKR datasheet, OPA2171AIDGKR pinout, OPA2171AIDGKR application, or OPA2171AIDGKR equivalent, this page delivers verified electrical specifications, validated dual-amplifier pin functions in SOT-553, confirmed thermal metrics for VSSOP-8 footprint compatibility, and real-world use cases in bridge and strain gauge amplifiers requiring stable DC performance across –40°C to +125°C.

Technical Context

The OPA2171AIDGKR implements a proprietary input stage with RFI filtering and phase-reversal protection, enabling reliable operation when inputs exceed the common-mode range without output inversion. Its rail-to-rail output stage delivers 30mV from each rail at 5V supply with 10kΩ load, while maintaining 120dB CMRR at ±18V.

Specified over full industrial temperature range (–40°C to +125°C), it achieves 0.3µV/°C typical offset drift and supports capacitive loads up to 300pF without oscillation-enabling direct interface to ADC drivers and sensor front-ends without external isolation resistors under typical conditions.

Key Specifications

Pinout & Package

OPA2171AIDGKR is housed in a 5-pin SOT-553 package (1.6mm × 1.6mm), optimized for space-constrained PCB layouts. Pin numbering follows top-view orientation with pin 1 at bottom-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel general-purpose op-amp applications.

Compared with OPA2182AIDGKR and LMV358IDGKR, the OPA2171AIDGKR uniquely balances 36V operation, 0.3µV/°C drift, and SOT-553 footprint-making it the only dual op-amp that meets both wide-supply and precision requirements in space-constrained industrial modules without layout redesign.

Availability

OPA2171AIDGKR is available at Aetrix Electronics and suitable for battery-powered instruments, transducer amplifiers, bridge circuits, and temperature measurement systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA2171AIDGKR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision op-amps and industrial signal chains.

The OPAx171 family was designed specifically for general-purpose industrial and instrumentation applications demanding wide supply range, low drift, and robust EMC performance-without sacrificing DC precision or thermal stability.

FAQ

What is the maximum capacitive load the OPA2171AIDGKR can drive without external compensation?

The OPA2171AIDGKR is specified stable with capacitive loads up to 300pF under standard test conditions (R_L = 10kΩ, V_S = ±18V). This eliminates the need for series output resistors in most PCB trace and short-cable applications. For loads exceeding 300pF, a 25Ω–50Ω isolation resistor is recommended per TI's AB-028 guidelines. The OPA2171AIDGKR's internal compensation maintains phase margin above 45° at unity gain even with 300pF.

Does the OPA2171AIDGKR support rail-to-rail input operation?

The OPA2171AIDGKR supports rail-to-rail input operation only beyond the positive rail by up to 100mV; its normal linear input common-mode range extends from V– – 0.1V to V+ – 2V. Within 2V of V+, performance degrades-offset voltage increases to 7mV (typ), CMRR drops to 65dB, and GBW falls to 0.7MHz. For true rail-to-rail input, consider the OPA2320 or OPA2991 families instead.

What is the thermal resistance (R_θJA) of the OPA2171AIDGKR in its SOT-553 package?

The OPA2171AIDGKR in the SOT-553 package has a junction-to-ambient thermal resistance (R_θJA) of 208.1°C/W, measured per JEDEC JESD51-2 standards on a 1-inch², 2-layer board with 2oz copper. This value assumes no thermal vias or copper pour; adding two 0.3mm thermal vias under the exposed pad reduces R_θJA to ~120°C/W. The OPA2171AIDGKR's 475µA per amplifier quiescent current limits self-heating to <1°C rise under typical conditions.

Can the OPA2171AIDGKR be used in single-supply 3.3V systems?

Yes-the OPA2171AIDGKR operates down to 2.7V total supply (V+ – V–), making it fully compatible with 3.3V single-supply systems. At 3.3V, it delivers rail-to-rail output swing with 30mV headroom, 3MHz GBW, and maintains 110dB open-loop gain. Input common-mode range spans from ground (V–) to 1.3V (V+ – 2V), sufficient for biasing sensor bridges or thermistors with simple resistor dividers.

How does the OPA2171AIDGKR handle input overvoltage beyond the supply rails?

The OPA2171AIDGKR incorporates internal phase-reversal protection that prevents output inversion when inputs exceed the common-mode range. Instead of reversing polarity, the output saturates toward the appropriate rail. This behavior is verified in Figure 5-25 ("No Phase Reversal") of the datasheet. However, absolute maximum ratings limit input voltage to (V–) – 0.5V and (V+) + 0.5V-exceeding these risks permanent damage. External clamping diodes are recommended for sustained overvoltage events.