Texas Instruments OPA2227P

Overview

OPA2227P from Texas Instruments is a dual, high-precision, low-noise operational amplifier in an 8-pin PDIP package. It delivers 3 nV/√Hz input voltage noise, 8 MHz gain bandwidth, 2.3 V/µs slew rate, and ±75 µV max input offset voltage across –40°C to 85°C. It serves as a pin-compatible upgrade to OP-27 in professional audio preamplifiers, precision data acquisition front-ends, and vibration analysis signal conditioning circuits.

For engineers reviewing the OPA2227P datasheet, OPA2227P pinout, OPA2227P application, or OPA2227P equivalent, key selection criteria include its unity-gain stability, dual-channel isolation (0.2 µV/V channel separation), wide ±2.5 V to ±18 V supply range, and guaranteed 138 dB CMRR at DC-critical for low-level sensor signal integrity in noisy industrial environments.

Technical Context

The OPA2227P implements a fully differential input stage with JFET inputs, enabling ultra-low input bias current (±10 nA max) and high common-mode rejection. Its internal compensation ensures unity-gain stability without external components, supporting direct use in transimpedance, active filter, and precision integrator topologies.

It features matched dual amplifiers on a single die with independent power pins per channel, allowing asymmetric supply configurations (e.g., +15 V/–5 V). Input voltage noise remains flat at 3 nV/√Hz from 100 Hz to 1 kHz, and output swing reaches within 2 V of rails at 10 kΩ load-enabling full-scale dynamic range in ±15 V systems.

Key Specifications

Pinout & Package

OPA2227P is housed in an 8-pin plastic dual in-line package (PDIP) with 9.81 mm × 6.35 mm body size and 0.3 inch lead spacing. The package is through-hole mountable and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2227P, the OPA2227UA offers identical precision in a smaller SOIC package ideal for modern layouts, while the LT1028ACN8#PBF trades wider supply range and lower cost for best-in-class noise-making OPA2227P the optimal balance for industrial and audio applications requiring robustness, ease of prototyping, and proven reliability.

Availability

OPA2227P is available at Aetrix Electronics and suitable for professional audio equipment, precision data acquisition systems, and vibration analysis instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA2227P 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 heritage in precision op amp innovation.

The OPAx22x product line was engineered specifically for applications demanding simultaneous high AC fidelity and DC accuracy-including audio, test equipment, and scientific instrumentation-where noise, offset, and stability cannot be compromised.

FAQ

What is the maximum operating temperature range for the OPA2227P?

The OPA2227P is specified for operation from –40°C to +85°C, with absolute maximum junction temperature rated at 150°C. Its electrical characteristics-including offset voltage drift (±0.6 µV/°C max), CMRR (120 dB min), and open-loop gain (132 dB min)-are guaranteed across this full industrial temperature range, making it suitable for deployment in uncontrolled environments like factory floors or outdoor monitoring enclosures.

Does the OPA2227P require external compensation capacitors?

No, the OPA2227P is internally compensated for unity-gain stability and does not require external compensation capacitors. Its design eliminates phase reversal and ensures stable operation with closed-loop gains from G = 1 to G = 100 without added components-reducing bill-of-materials count and layout complexity in precision buffer and active filter applications.

Can the OPA2227P drive capacitive loads directly?

The OPA2227P can drive moderate capacitive loads up to 100 pF stably; beyond that, external isolation resistance (e.g., 100 Ω in series with the output) is recommended to maintain phase margin. Typical overshoot remains below 10% at 1500 pF with G = –1, but for loads >500 pF in high-speed applications, adding a small series resistor preserves settling time integrity and avoids ringing in the OPA2227P output stage.

How does the OPA2227P compare to the OPA227P in terms of pin compatibility and performance?

The OPA2227P and OPA227P are not pin-compatible: OPA2227P is a dual amplifier (8-pin PDIP, pins 1–8 assigned to Channel A and B), while OPA227P is a single amplifier (8-pin PDIP, pins 1/8 for trim, 2/3 for inputs, 6 for output). Electrically, both share identical noise (3 nV/√Hz), GBW (8 MHz), and offset (±75 µV), but OPA2227P provides two independent amplifiers in one package-reducing board area and cost per channel in dual-path systems.

Is the OPA2227P suitable for single-supply operation?

Yes, the OPA2227P supports single-supply operation by biasing inputs and outputs within its common-mode and output voltage ranges. With V– = 0 V and V+ = +30 V, its input common-mode range extends from +2 V to +28 V, and output swings from +2 V to +28 V into 10 kΩ-enabling use in 24 V industrial sensors and PLC analog I/O modules without level-shifting circuitry.