Texas Instruments INA333AID Precision Instrumentation Amplifier – SOIC-8

Texas Instruments INA333AID Precision Instrumentation Amplifier – High Accuracy in Compact SOIC-8 Package

Bu INA333AID is a low-power, high-precision instrumentation amplifier from Texas Instruments, specifically designed for applications demanding accurate and stable signal conditioning. It operates with single or dual supplies as low as 1.8 V and as high as 5.5 V, making it compatible with modern low-voltage systems and battery-operated designs.

Equipped with low noise, low offset, and rail-to-rail output capability, the INA333AID simplifies analog front-end design for precision measurement, medical diagnostics, and industrial sensing systems. The device integrates precision trimming and chopper stabilization to deliver unmatched DC performance at a competitive price point.

Why the INA333AID Excels in Precision Analog Designs

For systems requiring accurate measurement of low-level signals in the presence of high common-mode voltages, the INA333AID delivers essential functionality in a small form factor. Its chopper-stabilized architecture eliminates 1/f noise, offset drift, and long-term drift—key factors in ensuring system integrity over time.

The combination of low input offset voltage (25 µV) and low drift (0.1 µV/°C) provides consistent performance even across temperature extremes. This makes the amplifier highly desirable for sensor-based systems such as electrochemical, temperature, pressure, and flow sensors used in harsh environments.

Technical Parameters – INA333AID at a Glance

Why INA333AID is Superior to Conventional Instrumentation Amplifiers

Many conventional instrumentation amplifiers suffer from poor temperature stability or require complex calibration circuits. The INA333AID overcomes these limitations through chopper technology, which actively cancels offset voltage and drift in real time. This means fewer external components, better performance, and faster time to market.

Furthermore, with ultra-low power consumption (50 µA), it can be used in power-sensitive medical or environmental monitoring devices. Its small SOIC-8 footprint reduces PCB area and cost, while still maintaining high isolation and precision.

The gain is easily adjustable using a single external resistor, simplifying BOM management and design flexibility. All these advantages make the INA333AID the first choice for designers targeting **low noise**, **low drift**, and **high input impedance** in their analog front-end systems.

Typical Applications for the INA333AID

• Medical Instrumentation: ECG, EEG, patient monitors, biosignal amplifiers
• Weigh Scales and Strain Gauges: Provides precise signal conditioning from load cells
• Temperature and Pressure Sensors: Delivers accurate amplification in HVAC and industrial environments
• Environmental Sensors: Used in handheld or remote sensing platforms
• Portable Data Acquisition Systems: Ensures low-noise, low-power signal capture

Texas Instruments – Precision and Trust You Can Build On

As a global leader in analog and mixed-signal semiconductors, Texas Instruments continues to innovate in precision signal amplification. The INA333AID draws from TI’s Burr-Brown™ expertise, offering tested and verified performance backed by extensive documentation, simulation models, and application notes.

Trusted by medical OEMs and industrial manufacturers worldwide, TI’s supply chain, long-term product availability, and compliance with quality certifications ensure the INA333AID meets both design and regulatory requirements.

Sıkça Sorulan Sorular (SSS)

1. Can the INA333AID be used with single-supply systems?

Yes, it supports single-supply operation from as low as 1.8 V, making it ideal for low-voltage and battery-powered systems commonly found in portable and medical electronics.

2. How does the chopper-stabilized architecture benefit precision applications?

It reduces low-frequency noise and eliminates input offset drift, improving measurement accuracy over time—especially critical in sensor systems and long-term monitoring applications.

3. What gain setting resistor is needed for G = 10?

The gain is set using the formula G = 1 + (50kΩ / R_G). For a gain of 10, R_G would be approximately 5.56 kΩ.

4. What is the noise performance of the INA333AID?

It offers low input voltage noise density, typically around 50 nV/√Hz at 1 kHz, making it suitable for low-level analog signal amplification in high-resolution systems.

5. Does the INA333AID require any special PCB layout considerations?

For optimal CMRR and noise rejection, ensure short and matched input traces, proper grounding, and placement of the gain resistor close to the device pins.