Texas Instruments OPA2156ID

Overview

OPA2156ID from Texas Instruments is a dual-channel, 36-V, rail-to-rail input/output CMOS precision operational amplifier optimized for high-voltage, low-noise signal conditioning. It delivers 3 nV/√Hz voltage noise at 10 kHz, ±25 µV max offset voltage, and 25-MHz gain bandwidth - enabling high-fidelity analog front-ends in photodiode transimpedance amplifiers and high-resolution ADC drivers.

For engineers reviewing the OPA2156ID datasheet, OPA2156ID pinout, OPA2156ID application, or OPA2156ID equivalent, key selection criteria include ultra-low broadband noise performance, rail-to-rail operation across ±2.25 V to ±18 V supplies, fast 600 ns settling to 0.01%, and validated operation over –40°C to +125°C in SOIC-8 packaging.

Technical Context

The OPA2156ID employs a three-stage architecture with a low-noise PMOS input stage, feed-forward path, and high-current output stage - enabling simultaneous low distortion and wide bandwidth. Its phase-reversal protection prevents output inversion during common-mode overdrive, and its CMOS input delivers ±5 pA bias current with 120 dB CMRR in the linear region.

It operates from single-supply (4.5 V to 36 V) or split-supply (±2.25 V to ±18 V) configurations, supports capacitive loads up to 100 pF with stable phase margin, and maintains 154 dB open-loop gain and 40 V/µs slew rate across full temperature range.

Key Specifications

Pinout & Package

OPA2156ID is packaged in an industry-standard 8-pin SOIC (D package), with 4.90 mm × 3.90 mm body size and standard JEDEC MS-012AC footprint. Pin functions are fully specified per TI SBOS900B datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2156ID, OPA2182ID trades bandwidth and noise for superior DC precision, while ADA4522-2ARZ sacrifices speed and power efficiency for near-zero drift - making OPA2156ID the optimal balance for high-voltage, wideband precision analog systems.

Availability

OPA2156ID is available at Aetrix Electronics and suitable for photodiode transimpedance amplifiers, high-resolution ADC driver amplifiers, and analog input modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA2156ID 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 high-reliability industrial ICs.

The OPA2156ID belongs to TI's OPA2156 family of 36-V rail-to-rail CMOS op amps, engineered specifically for high-voltage, low-noise industrial signal conditioning where speed, accuracy, and robustness coexist.

FAQ

What is the maximum capacitive load the OPA2156ID can drive stably?

The OPA2156ID maintains stable operation with capacitive loads up to 100 pF when properly compensated (e.g., using R_ISO = 25 Ω in series with the output). Phase margin remains >45° across temperature and supply conditions per Figure 28 in the SBOS900B datasheet. For loads >100 pF, external isolation resistance or feedback network adjustment is required to prevent peaking or oscillation in the OPA2156ID.

Does the OPA2156ID support single-supply operation?

Yes, the OPA2156ID supports true single-supply operation from 4.5 V to 36 V. Its rail-to-rail input and output stages allow common-mode and output swing from V– (GND in single-supply) to V+, enabling use in 3.3-V, 5-V, 12-V, and 24-V systems without level-shifting. The OPA2156ID's input common-mode range extends 0.1 V beyond both rails, simplifying biasing in single-ended sensor interfaces.

What is the typical quiescent current per channel of the OPA2156ID?

The OPA2156ID draws 4.4 mA to 5.2 mA per amplifier at 25°C, depending on supply voltage - 4.4 mA at ±2.25 V and 5.2 mA at ±18 V. Over the full –40°C to +125°C range, quiescent current remains within 5.2 mA (SOIC package), ensuring predictable power budgeting in thermally constrained industrial designs using the OPA2156ID.

How does the OPA2156ID handle input overvoltage beyond the common-mode range?

The OPA2156ID features integrated phase-reversal protection that clamps the output to the nearest rail instead of inverting it when inputs exceed the linear common-mode range (e.g., >V+ – 1.25 V in NMOS region). This behavior - verified in Figure 42 of SBOS900B - prevents erroneous control signals in safety-critical sensor interfaces and eliminates need for external clamping diodes in the OPA2156ID design.

Is the OPA2156ID pin-compatible with other TI dual op amps in SOIC-8?

No, the OPA2156ID uses a non-standard pinout optimized for dual-channel symmetry and layout flexibility: OUT A (1), –IN A (2), +IN A (3), V– (4), +IN B (5), –IN B (6), OUT B (7), V+ (8). It is not pin-compatible with legacy TI dual op amps like TL072 or OPA2333. Layout must follow the OPA2156ID-specific pin mapping shown in Figure 3 of SBOS900B.