Texas Instruments OPA4172IPW

Overview

OPA4172IPW from Texas Instruments is a quad, rail-to-rail output, 36-V operational amplifier with 10-MHz gain bandwidth, ±0.2-mV offset voltage, and 7-nV/√Hz input voltage noise density-designed for precision signal conditioning in industrial sensor interfaces and power module tracking amplifiers.

For engineers reviewing the OPA4172IPW datasheet, OPA4172IPW pinout, OPA4172IPW application, or OPA4172IPW equivalent, key selection criteria include its wide 4.5–36-V supply range, rail-to-rail output swing within 70 mV of rails (at 36 V, 10-kΩ load), low 1.6-mA per-amplifier quiescent current, and operation across –40°C to +125°C for harsh-environment embedded systems.

Technical Context

The OPA4172IPW employs high-voltage CMOS input stage architecture enabling full rail-to-rail input operation (to within 100 mV of V– and 2 V of V+) without phase reversal, and supports single- or dual-supply configurations from ±2.25 V to ±18 V. Its 10-MHz GBP and 10-V/µs slew rate support stable closed-loop operation at unity gain with capacitive loads up to 100 pF.

It delivers 120-dB common-mode rejection and 120-dB power-supply rejection over temperature, with input bias current as low as ±8 pA and offset drift of ±0.3 µV/°C-enabling high-accuracy DC-coupled amplification in bridge and strain gauge circuits where long-term stability and low thermal error are critical.

Key Specifications

Pinout & Package

TSSOP-14 package (4.40 mm × 5.00 mm body size), thermally enhanced for high-density PCB layouts in space-constrained industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4172IPW, OPA4197IPW improves noise and speed at the expense of power and thermal robustness, while AD8604ARUZ trades voltage range and drift performance for lower cost and quiescent current in sub-6-V designs.

Availability

OPA4172IPW is available at Aetrix Electronics and suitable for industrial sensor interfaces, power module tracking amplifiers, and precision bridge measurement systems requiring stable component supply across extended temperature and voltage ranges.

Supply support for OPA4172IPW 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 solutions, with decades of expertise in high-precision op amps and industrial-grade signal chain components.

The OPAx172 family-including OPA4172IPW-is engineered for high-voltage, wide-temperature industrial applications demanding low drift, low noise, and rail-to-rail operation without sacrificing bandwidth or output drive.

FAQ

What is the maximum capacitive load the OPA4172IPW can drive stably?

The OPA4172IPW maintains stability with capacitive loads up to 100 pF when configured as a unity-gain buffer, as verified in TI's SBOS618I datasheet Figure 23–24. For loads exceeding 100 pF, an isolation resistor (e.g., 10–50 Ω) between the output and capacitance is recommended to preserve phase margin. This capability makes OPA4172IPW suitable for driving ADC input capacitors and long PCB traces in data acquisition systems without external compensation.

Does the OPA4172IPW support true rail-to-rail input operation?

Yes-the OPA4172IPW input common-mode range extends from V– – 0.1 V to V+ – 2 V under normal operation, and can tolerate signals up to V+ + 0.1 V (with reduced performance within 2 V of V+). This enables direct interfacing with ground-referenced sensors and single-supply systems without level-shifting circuitry. The OPA4172IPW datasheet confirms this behavior in Section 3 (Description) and Figure 4–5.

What is the typical THD+N performance of the OPA4172IPW at 1 kHz?

At VS = +36 V, G = +1, f = 1 kHz, and VO = 3.5 VRMS, the OPA4172IPW achieves a typical THD+N of 0.00005% (–126 dB), as specified in Section 7.7 of the SBOS618I datasheet. This ultra-low distortion supports high-fidelity signal paths in test equipment and audio-grade sensor interfaces where harmonic artifacts must remain below 16-bit quantization noise floor.

Can the OPA4172IPW operate from a single 5-V supply?

Yes-the OPA4172IPW is fully specified from +4.5 V to +36 V single-supply operation. At 5 V, it delivers rail-to-rail output swing within 20 mV of each rail (RL = 10 kΩ) and maintains 10-MHz GBP and ±0.2-mV offset. This makes OPA4172IPW viable for low-voltage portable instrumentation while retaining compatibility with higher-voltage industrial platforms-a key advantage over legacy 5-V-only op amps.

How does the OPA4172IPW handle input overvoltage conditions beyond the supply rails?

The OPA4172IPW features robust input protection that prevents phase reversal when input signals exceed the supply rails by up to ±0.5 V (per Absolute Maximum Ratings). Unlike many op amps, it continues linear operation without latch-up or output inversion-critical in industrial systems where sensor faults or ESD events may cause transient overvoltage. This behavior is explicitly guaranteed in the device description and confirmed in Figure 37 of the SBOS618I datasheet.