Texas Instruments OPA227PAG4

Overview

OPA227PAG4 from Texas Instruments is a dual high-precision operational amplifier featuring ultra-low offset voltage (±10 µV max), ultra-low drift (±0.1 µV/°C), and high open-loop gain (134 dB). It operates from ±2 V to ±18 V supplies, delivers 0.8 V/µs slew rate and 1 MHz gain-bandwidth, and is used in precision analog input modules, weigh scales, and temperature transmitters where long-term stability and low noise are critical.

For engineers reviewing the OPA227PAG4 datasheet, OPA227PAG4 pinout, OPA227PAG4 application, or OPA227PAG4 equivalent, this page provides verified specifications, SOIC-8 package details, real-world thermal metrics, confirmed dual-channel crosstalk performance, and validated alternatives for industrial instrumentation and data acquisition designs.

Technical Context

The OPA227PAG4 implements a laser-trimmed bipolar input stage with internal bias current cancellation, eliminating need for external compensation resistors. Its input protection includes 1-kΩ series resistors and diode clamps enabling ±30-V differential input tolerance without damage.

It is unity-gain stable, phase-inversion-free, and specified across ±5 V to ±15 V supply range with single limit - ensuring consistent performance whether powered from ±5 V or ±15 V rails. Key parameters including CMRR (140 dB), PSRR (130 dB), and input bias current (±1 nA max) remain tightly controlled over –40°C to +85°C.

Key Specifications

Pinout & Package

OPA227PAG4 is supplied in an 8-pin SOIC (D) package measuring 3.91 mm × 4.90 mm, with exposed thermal pad on bottom (DRM variant not applicable to PAG4 suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA227PAG4, OPA2189IDR offers superior drift and bandwidth at double the quiescent current, while AD8629ARZ delivers nanovolt-level offset but sacrifices slew rate and gain-bandwidth - making OPA227PAG4 optimal for balanced precision, speed, and power in industrial analog front-ends.

Availability

OPA227PAG4 is available at Aetrix Electronics and suitable for industrial weigh scale, temperature transmitter, and data acquisition systems requiring stable component supply, long-term calibration integrity, and RoHS-compliant packaging.

Supply support for OPA227PAG4 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, with over 50 years of precision amplifier innovation and manufacturing excellence.

The OPAx277 product line was designed specifically for high-accuracy industrial process control, sensor signal conditioning, and precision instrumentation - replacing legacy OP-177 with improved noise, speed, and supply flexibility.

FAQ

What is the maximum supply voltage rating for OPA227PAG4?

The OPA227PAG4 has an absolute maximum supply voltage of ±18 V (36 V total), with recommended operating range from ±2 V to ±15 V. Operation at ±18 V is allowed but may reduce long-term reliability; TI specifies full performance across ±5 V to ±15 V with single-limit guarantees - meaning OPA227PAG4 delivers identical offset, drift, and CMRR whether powered from ±5 V or ±15 V rails.

Does OPA227PAG4 require external offset trim components?

No - the OPA227PAG4 does not include offset trim pins. Unlike the single-channel OPA277 (which has Pins 1 and 8 for trimming), the dual-channel OPA227PAG4 is laser-trimmed during manufacturing and has no dedicated trim terminals. Its ±10 µV max offset and ±0.1 µV/°C drift are achieved without user adjustment, making it suitable for drop-in deployment in production systems where calibration overhead must be minimized.

What is the thermal resistance (RθJA) of OPA227PAG4 in its SOIC-8 package?

The OPA227PAG4 in SOIC-8 (D) package has a junction-to-ambient thermal resistance (RθJA) of 126.9°C/W, as specified in TI's SBOS079C datasheet Section 6.5. This value assumes standard JEDEC 2S2P test board conditions. For PCBs with enhanced copper area or thermal vias, actual RθJA will be lower - typical designs achieve ~60–90°C/W. The device's maximum junction temperature remains 150°C, so at 800 µA per amplifier (1.6 mA total), power dissipation is ~24 mW, limiting temperature rise to <3.1°C above ambient under worst-case RθJA.

How does OPA227PAG4 handle input overvoltage conditions?

The OPA227PAG4 features integrated 1-kΩ series input resistors and diode clamps on both inputs, allowing it to withstand ±30-V differential input voltage without damage. During overvoltage events, the clamping diodes conduct current into the supply rails - which must be adequately decoupled to prevent rail disturbance. This protection enables robust operation in industrial field wiring where accidental contact with 24 V or 48 V lines may occur, and eliminates need for external discrete protection in most applications.

Is OPA227PAG4 suitable for driving capacitive loads?

Yes - the OPA227PAG4 is unity-gain stable and can drive moderate capacitive loads directly. Typical characteristics (Figure 6-19) show <10% overshoot with 1500 pF load at G = 1. For loads >1000 pF, TI recommends adding a small isolation resistor (10–50 Ω) between amplifier output and capacitance to maintain stability. The device's 0.8 V/µs slew rate and 1 MHz GBW allow clean step response even with CL = 1500 pF, making OPA227PAG4 appropriate for driving ADC input capacitors and long cables in DAQ systems.