Texas Instruments OPA4227UA

Overview

OPA4227UA from Texas Instruments is a quad, high-precision, low-noise operational amplifier with 3 nV/√Hz input voltage noise, 8 MHz gain bandwidth, 2.3 V/µs slew rate, and ±2.5 V to ±18 V dual-supply operation. It delivers precision DC performance and wide AC bandwidth for instrumentation-grade signal conditioning in professional audio and data acquisition systems.

For engineers reviewing the OPA4227UA datasheet, OPA4227UA pinout, OPA4227UA application, or OPA4227UA equivalent, key selection criteria include its unity-gain stability, 75 µV max input offset voltage, 138 dB CMRR, 160 dB open-loop gain, and SO-14 package compatibility with space-constrained multichannel designs.

Technical Context

The OPA4227UA implements a fully differential, bipolar-input op amp architecture optimized for unity-gain stability and minimal phase reversal risk. Its internal compensation ensures stable operation at G = 1 without external components while maintaining 5 µs 0.1% settling time for 10 V steps.

It supports rail-to-rail output swing within 2 V of supplies (±2.5 V to ±18 V), features matched input bias currents (<10 nA), and maintains 120 dB CMRR over –40°C to 85°C - enabling high-fidelity analog front-ends where common-mode rejection and thermal drift control are critical.

Key Specifications

Pinout & Package

OPA4227UA is housed in a 14-pin SOIC (SO-14) package measuring 8.65 mm × 3.91 mm, optimized for surface-mount assembly and thermal performance (θ_JA = 65°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA4228UA and AD8628ARZ-REEL, the OPA4227UA uniquely balances 8 MHz bandwidth, unity-gain stability, and 3 nV/√Hz noise - making it optimal for multichannel audio and mid-bandwidth instrumentation where both precision and speed matter.

Availability

OPA4227UA is available at Aetrix Electronics and suitable for professional audio equipment, geophysical data acquisition, vibration analysis systems, and active filter banks requiring stable component supply across extended production lifecycles.

Supply support for OPA4227UA 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The OPAx22x product line was designed specifically for high-fidelity signal conditioning in applications demanding simultaneous precision DC accuracy and wide AC bandwidth - such as test equipment, medical instrumentation, and professional audio.

FAQ

What is the maximum capacitive load the OPA4227UA can drive without instability?

The OPA4227UA drives up to 100 pF directly without external compensation, as verified in Figure 26 of the SBOS110B datasheet. For loads >100 pF, a series resistor (typically 10–50 Ω) placed between the output and capacitive load restores phase margin. This behavior is consistent across all four channels of the OPA4227UA and applies under ±15 V supply conditions.

Does the OPA4227UA require external offset nulling components?

No, the OPA4227UA does not provide offset trim pins - unlike the single OPA227 or dual OPA2227 variants. Its ±75 µV maximum input offset voltage is factory trimmed and stable over temperature, eliminating need for external potentiometers or calibration circuitry in most precision applications using the OPA4227UA.

Can the OPA4227UA operate from a single 5 V supply?

Yes, the OPA4227UA supports single-supply operation with V+ = 5 V and V– = 0 V (i.e., 5 V total supply), meeting its ±2.5 V minimum requirement. Input common-mode range extends from (V–)+2 V to (V+)-2 V, so with 0 V/5 V rails, usable input range is 2 V to 3 V. Output swings to within 2 V of each rail, delivering 1 V to 4 V for load resistances ≥10 kΩ.

How does channel separation performance impact multichannel OPA4227UA designs?

OPA4227UA achieves 0.2 µV/V (110 dB) DC channel separation, meaning a 1 V signal on channel A induces only 0.2 µV of error on channel D's output. This enables true simultaneous sampling in 4-channel data loggers without hardware isolation, reducing PCB area and cost versus discrete op amp solutions - a key advantage confirmed in the device's functional description section.

Is the OPA4227UA pin-compatible with other quad op amps like the LM324?

No, the OPA4227UA uses a non-standard SO-14 pinout optimized for signal integrity and thermal performance - differing from LM324's DIP-14/SO-14 layout. Pin 1 is Out A (not V–), and V+ is on Pin 4 (not Pin 4 in LM324). Direct replacement would require PCB redesign; however, the OPA4227UA replaces industry-standard OP-27-based quad designs like the LT1014 in high-performance applications.