Texas Instruments OPA2171AID

Overview

OPA2171AID from Texas Instruments is a dual-channel, 36V single-supply general-purpose operational amplifier in an 8-pin SOIC package. It delivers rail-to-rail output, 3MHz gain bandwidth, 14nV/√Hz input voltage noise at 1kHz, ±0.3µV/°C typical offset drift, and 475µA per amplifier quiescent current-enabling precision signal conditioning in battery-powered instruments and transducer amplifiers.

For engineers reviewing the OPA2171AID datasheet, OPA2171AID pinout, OPA2171AID application, or OPA2171AID equivalent, key selection criteria include its wide 2.7V–36V supply range, full rail-to-rail input operation beyond V+, RFI-filtered inputs, and stable performance with up to 300pF capacitive loads-critical for high-accuracy analog front-ends in industrial sensing and power module tracking.

Technical Context

The OPA2171AID implements a PCH/NCH complementary input stage with internal phase-reversal protection, enabling robust operation when input signals exceed the common-mode range without output inversion. Its open-loop gain exceeds 110dB over –40°C to +125°C, and CMRR reaches 120dB at ±18V supply with VCM within (V–)–0.1V to (V+)–2V.

It supports true single-supply operation with input range extending 100mV below V– and within 2V of V+, while maintaining rail-to-rail output swing (within 30mV of rails at 5V supply). The device remains stable driving capacitive loads up to 300pF and exhibits no phase reversal under common-mode overvoltage conditions.

Key Specifications

Pinout & Package

OPA2171AID is housed in an 8-pin SOIC (D) package measuring 4.9mm × 6mm, optimized for thermal dissipation (RθJA = 134.3°C/W) and board-level reliability in industrial environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2171AID, OPA2182AID trades higher quiescent current for nanovolt-level stability in metrology-grade systems, while LM2904BDR sacrifices noise, drift, and RFI immunity for commodity-level pricing-making OPA2171AID the optimal choice for industrial-grade precision at moderate power.

Availability

OPA2171AID is available at Aetrix Electronics and suitable for transducer amplifiers, bridge amplifiers, tracking amplifiers, and battery-powered instruments requiring stable component supply across extended temperature and voltage ranges.

Supply support for OPA2171AID 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 for general-purpose precision amplification in industrial, automotive, and test equipment-emphasizing wide supply range, low drift, and robustness in real-world operating conditions.

FAQ

What is the maximum capacitive load the OPA2171AID can drive without instability?

The OPA2171AID is specified stable with capacitive loads up to 300pF across its full operating temperature and supply range. This eliminates the need for series isolation resistors in many ADC driver and active filter applications. For loads exceeding 300pF, a small series resistor (e.g., 50Ω) between the output and load restores phase margin-verified in TI's SBOS516H datasheet Figure 5-23 and Figure 5-24.

Does the OPA2171AID support true rail-to-rail input operation?

Yes, the OPA2171AID supports full rail-to-rail input operation: its common-mode range extends 100mV below V– and up to 100mV beyond V+ (though performance degrades within 2V of V+). This allows direct interfacing with ground-referenced sensors and high-side voltage monitors without external level-shifting circuitry-confirmed in Section 6.3.2 of the SBOS516H datasheet.

What is the typical input offset voltage drift of the OPA2171AID over temperature?

The OPA2171AID has a typical input offset voltage drift of ±0.3µV/°C over –40°C to +125°C, with a maximum of ±2µV/°C. This low drift ensures minimal calibration drift in unattended industrial monitoring systems-validated in Table 5-7 (Electrical Characteristics) and Figure 5-2 of the SBOS516H datasheet.

Can the OPA2171AID operate from a single 3.3V supply?

Yes, the OPA2171AID operates from supplies as low as 2.7V, making it fully compatible with 3.3V single-supply systems. At 3.3V, it maintains rail-to-rail output swing (within ~40mV of rails), 14nV/√Hz noise, and 3MHz gain bandwidth-enabling precision amplification in modern low-voltage IoT sensor nodes and portable medical devices.

How does the OPA2171AID handle input overvoltage conditions that cause phase reversal in other op-amps?

The OPA2171AID incorporates internal phase-reversal protection. When input signals exceed the linear common-mode range, the output saturates toward the appropriate rail instead of inverting polarity-preventing catastrophic control loop failures in safety-critical applications like power supply feedback paths. This behavior is demonstrated in Figure 5-25 ("No Phase Reversal") of the SBOS516H datasheet.