INA129 Instrumentation Amplifier Module

The INA129 Instrumentation Amplifier Module is a high-precision, low-power differential amplifier designed for accurate measurement of small signals in noisy environments. Based on the advanced INA129 IC from Texas Instruments, this module offers high input impedance, low offset voltage, and excellent Common Mode Rejection Ratio (CMRR) — making it ideal for sensor signal conditioning, biomedical instrumentation, and industrial automation applications.

With its versatile design, the module is compatible with Arduino and Accessories, Raspberry Pi, and other microcontroller platforms. It’s an essential component for projects involving load cells, bridge sensors, strain gauges, and temperature sensors.

⚙️ Technical Information

• Model: INA129 Instrumentation Amplifier Module

• Input Voltage Range: ±2.25V to ±18V

• Input Offset Voltage: 50µV typical

• Drift: 0.5µV/°C

• Gain Range: 1 to 10,000 (set by external resistor RG)

• Common Mode Rejection Ratio (CMRR): Up to 120dB

• Input Impedance: >10⁹Ω

• Noise: 8nV/√Hz (G=1)

• Operating Temperature: -40°C to +85°C

• Package: DIP module for easy prototyping

• Output Type: Single-ended analog signal

The INA129 uses a three-op-amp internal architecture to provide exceptional accuracy and stability. The gain is easily set using a single resistor between the RG pins, calculated by:

This makes it flexible for applications that require fine control over amplification levels.

⚡ Key Features

✅ High precision and stability
✅ Single resistor gain control
✅ High input impedance and low noise
✅ Wide operating voltage range
✅ Ideal for bridge amplifiers and data acquisition systems
✅ Compatible with Arduino and other microcontrollers
✅ Compact and easy to integrate design

💡 Applications

• Load cell and weight measurement systems

• Bridge sensor signal conditioning

• ECG and biomedical signal amplification

• Industrial monitoring and automation

• Thermocouple and RTD signal amplification

• Data acquisition systems and analog front-ends for Electronics Components

• Smart sensor development for IoT projects using NodeMCU

⚠️ Precautions & Usage Tips

• Choose the correct RG resistor to set the desired gain value.

• Ensure power supply polarity is correct to prevent IC damage.

• Keep analog signal paths short to minimize noise pickup.

• Use decoupling capacitors near power supply pins.

• Avoid exceeding input protection limits (±40V max).

• When using with Arduino boards, ensure the output voltage is within ADC range (0–5V or 0–3.3V).

📺 YouTube Tutorial

Watch this video to learn how to interface the INA129 Instrumentation Amplifier Module with Arduino and sensors:
🔗 https://www.youtube.com/watch?v=RbUuFW0g4fM

🧩 Compatible Categories

• Arduino and Accessories

• Electronics Components

• Tools and Accessories

• IC’s

🧠 Product Summary

The INA129 Instrumentation Amplifier Module is the perfect solution for precision signal amplification in sensor-based projects. With its high accuracy, low noise, and adjustable gain, it’s ideal for engineers, students, and developers working on advanced data acquisition, medical electronics, and industrial automation projects. Its easy integration with Arduino, Raspberry Pi, and other microcontrollers makes it a must-have for both professionals and hobbyists.