Texas Instruments OPA4172ID

Overview

OPA4172ID 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. It operates from ±2.25 V to ±18 V supplies and supports precision transducer amplification in industrial sensor signal chains.

For engineers reviewing the OPA4172ID datasheet, OPA4172ID pinout, OPA4172ID application, or OPA4172ID equivalent, this page delivers verified specifications, SOIC-14 package details, real-world THD+N performance at 1 kHz (0.00005%), and validated alternatives for bridge amplifier, strain gauge, and temperature measurement designs.

Technical Context

The OPA4172ID uses high-voltage CMOS process technology to achieve rail-to-rail output swing within 70 mV of either supply rail at ±18 V with 10-kΩ load, while maintaining 120-dB common-mode rejection across –40°C to +125°C. Its input stage operates 100 mV below V– and within 2 V of V+, enabling true single-supply operation without phase reversal.

It integrates EMI/RFI-filtered inputs and delivers 10-V/µs slew rate with 2-µs settling time to 0.1% for 10-V steps-critical for fast-settling precision integrators and tracking amplifiers in power modules where stability under capacitive loads up to 100 pF is required.

Key Specifications

Pinout & Package

OPA4172ID is housed in a 14-pin SOIC package (body size 8.65 mm × 3.91 mm) with standard pin spacing (1.27 mm), compatible with automated PCB assembly and IPC-7351B footprint IPC7351SOIC14_391x865_P127mm_EP.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4172ID, OPA4182IDR improves thermal stability by 15× but increases unit cost by 2.3×, while AD8604ARUZ trades supply flexibility for lower noise in sub-6-V domains-neither matches OPA4172ID's 36-V rail-to-rail capability and industrial temperature range.

Availability

OPA4172ID is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, precision power module monitoring, and 4-channel data acquisition systems requiring stable component supply across extended temperature ranges.

Supply support for OPA4172ID 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 over 50 years of innovation in precision amplifiers and power management ICs.

The OPAx172 family-including OPA4172ID-is designed for high-voltage, low-noise industrial signal chains where rail-to-rail output, EMI robustness, and wide temperature operation are mandatory.

FAQ

What is the maximum capacitive load the OPA4172ID can drive without instability?

The OPA4172ID is characterized to drive up to 100 pF capacitive loads while maintaining ≥45° phase margin, as confirmed in Figure 23–24 of the SBOS618I datasheet. For loads exceeding 100 pF, an isolation resistor (typically 10–50 Ω) between the OPA4172ID output and the capacitor is required to preserve stability-this solution is documented in Section 9.1 of the datasheet. The OPA4172ID's internal compensation does not support direct heavy capacitive loading.

Does the OPA4172ID support true single-supply operation with input signals extending to ground?

Yes-the OPA4172ID's input common-mode range extends to V– – 0.1 V, allowing direct interface with ground-referenced sensors when V– is connected to 0 V. Its rail-to-rail output swings within 70 mV of ground at ±18 V supply, enabling full-scale signal capture in single-supply 36-V systems. This behavior is specified in Section 7.7 (Input Voltage) of the SBOS618I datasheet.

What is the typical THD+N performance of the OPA4172ID at 10 kHz and 10-VPP output?

At 10 kHz and 10-VPP output into 10-kΩ load with ±18 V supplies, the OPA4172ID achieves –102 dB (0.000079%) THD+N, as shown in Figure 16 of the SBOS618I datasheet. This value degrades slightly from the 1-kHz spec (–126 dB) due to increasing harmonic content at higher frequencies but remains sufficient for 16-bit AC-coupled measurement systems.

Can the OPA4172ID be used in a unity-gain stable configuration with 100-kΩ feedback resistors?

Yes-the OPA4172ID is unity-gain stable and fully characterized for G = +1 configurations. Using 100-kΩ feedback resistors introduces negligible parasitic capacitance and maintains phase margin >60°, as verified in Figure 20 (Closed-Loop Gain vs Frequency). However, for optimal noise performance, feedback networks should use metal-film resistors with <0.1-pF shunt capacitance.

How does the OPA4172ID's input bias current compare to JFET-input op amps like TL074?

The OPA4172ID's ±8-pA typical input bias current is 100× lower than TL074's ±200-pA spec, enabling direct connection to >1-GΩ sources such as piezoelectric sensors or high-value RC filters without significant DC error. This advantage stems from its high-voltage CMOS input stage, unlike TL074's bipolar input, which also exhibits higher voltage noise (18 nV/√Hz vs 7 nV/√Hz).