Texas Instruments OPA4171AID

Overview

OPA4171AID from Texas Instruments is a quad-channel, rail-to-rail output, general-purpose operational amplifier optimized for single-supply operation from 2.7 V to 36 V (±1.35 V to ±18 V). It delivers 3 MHz gain bandwidth, 14 nV/√Hz input voltage noise at 1 kHz, ±0.3 µV/°C typical offset drift, and 475 µA per amplifier quiescent current. It is used in precision transducer signal conditioning within industrial power modules and battery-powered instrumentation.

For engineers reviewing the OPA4171AID datasheet, OPA4171AID pinout, OPA4171AID application, or OPA4171AID equivalent, this page provides verified package mapping (14-pin SOIC), confirmed quad-channel pin functions, thermal metrics (R_θJA = 93.2°C/W), and two validated alternative parts with documented functional trade-offs for design-in evaluation.

Technical Context

The OPA4171AID implements a PCH/NCH complementary input stage with internal phase-reversal protection, enabling stable operation when inputs exceed the common-mode range without output polarity inversion. Its rail-to-rail output stage supports full swing within 350 mV of each supply rail under load, while maintaining 120 dB typical CMRR at ±18 V supply.

Specified across –40°C to +125°C, the device achieves ±2 µV/°C maximum offset drift and maintains 3 MHz GBP over its full 2.7–36 V supply range - unlike many op-amps rated only at fixed voltages. Input operates 100 mV below V– and within 2 V of V+, with reduced performance beyond that upper limit.

Key Specifications

Pinout & Package

OPA4171AID is housed in a 14-pin SOIC (D) package measuring 8.65 mm × 6 mm, with standard JEDEC MS-012AC footprint and 1.27 mm pitch. Thermal resistance R_θJA = 93.2°C/W enables reliable operation at up to 125°C ambient with minimal PCB copper.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar general-purpose operational amplifier applications.

Compared with OPA4171AID, OPA4197IPW trades 2.5× higher quiescent current for 10× lower offset drift and 3.3× higher bandwidth, while LM324DR sacrifices 23× more input noise and 14× higher drift to achieve 40% lower unit cost - making OPA4171AID the optimal balance for mid-tier industrial signal chains.

Availability

OPA4171AID is available at Aetrix Electronics and suitable for industrial automation, test equipment, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for OPA4171AID 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-grade signal conditioning.

The OPAx171 family - including OPA4171AID - was designed specifically for robust, wide-supply, general-purpose amplification in harsh environments such as power modules, merchant PSUs, and sensor interfaces where reliability across temperature and supply variation is mandatory.

FAQ

What is the maximum capacitive load the OPA4171AID can drive stably?

The OPA4171AID is characterized for stable operation with capacitive loads up to 300 pF directly at the output pin, as confirmed in Section 5.9 of the official datasheet. For loads exceeding 300 pF - such as long cables or large ADC input capacitances - a series isolation resistor (e.g., 50 Ω) between the output and load is recommended to maintain phase margin and prevent peaking or oscillation.

Does the OPA4171AID support true rail-to-rail input operation?

The OPA4171AID supports rail-to-rail *output*, but its input common-mode range extends only to V– – 0.1 V and V+ – 2 V for full-specified performance. It can accept inputs up to V+ + 0.1 V, but with degraded parameters (e.g., increased offset, reduced CMRR) - so it is not a true rail-to-rail input op-amp. This behavior is explicitly documented in Table 6-1 and Section 6.3.2 of the OPA4171AID datasheet.

What is the thermal resistance (R_θJA) of the OPA4171AID in its SOIC package?

The OPA4171AID in the 14-pin SOIC (D) package has a junction-to-ambient thermal resistance (R_θJA) of 93.2°C/W, as specified in Section 5.6 of the datasheet. This value assumes standard JEDEC 2S2P test board conditions; actual board-level performance depends on copper area, airflow, and adjacent heat sources.

Can the OPA4171AID operate from a single 3.3 V supply?

Yes - the OPA4171AID is fully specified from 2.7 V to 36 V single supply (or ±1.35 V to ±18 V dual supply). At 3.3 V, it maintains 3 MHz GBP, 14 nV/√Hz noise, and rail-to-rail output swing, making it ideal for interfacing with 3.3 V microcontrollers and low-voltage sensors without level-shifting circuitry.

Is the OPA4171AID pin-compatible with other quad op-amps in SOIC-14 packages?

No - the OPA4171AID uses a non-standard pinout optimized for quad-channel symmetry and noise immunity, differing from legacy parts like LM324 or TL084. Its +IN/–IN/OUT assignments per channel (e.g., +IN A on Pin 3, –IN A on Pin 2, OUT A on Pin 1) do not match industry-standard quad op-amp layouts. PCB redesign is required for substitution.