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INA118U/2K5

TIINA118U/2K5

Texas Instruments
Instrumentation Amplifier 1 Circuit 8-SOIC
Active3,099 in stock
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Overview

The INA118U is a high-accuracy, low-power instrumentation amplifier designed for versatile precision signal conditioning. It operates on a wide supply range from 2.25V to 18V and requires only 350uA of quiescent current, making it suitable for battery-powered systems. The device features internal input protection up to +/-40V beyond the supply rails.

Why Choose This Part

The INA118U allows the gain to be set from 1 to 10000 using a single external resistor, simplifying circuit design. It offers an excellent balance of low power consumption (350uA) and 800kHz bandwidth, while the +/-40V input overvoltage protection ensures reliability in harsh industrial environments.

Applications

Bridge Amplifiers
Ideal for weigh scales and pressure transmitters due to its low 25uV offset voltage and high common-mode rejection.
Medical Instrumentation
Used in ECG and patient monitoring equipment where low noise (10nV/rtHz) and high input impedance are critical.
Industrial Data Acquisition
Serves as a robust analog front-end for DAQ systems and PLC analog input modules.
RTD Temperature Sensors
Provides precise amplification for RTD and thermocouple signals in industrial temperature transmitters.

Key Specifications

Slew Rate 0.9V/us
Mounting Type Surface Mount
-3db Bandwidth 800 kHz
Amplifier Type Instrumentation
Package / Case 8-SOIC (0.154", 3.90mm Width)
Current - Supply 350uA
Number of Circuits 1
Current - Input Bias 1 nA
Operating Temperature -40degC ~ 85degC
Voltage - Input Offset 25 uV
Supplier Device Package 8-SOIC
Current - Output / Channel 12 mA
Voltage - Supply Span (Max) 36 V
Voltage - Supply Span (Min) 2.7 V

Getting Started

To get started, calculate the gain resistor value using the formula Rg = 50k / (G - 1). Ensure a low-impedance path for input bias currents, such as a high-value resistor to ground for AC-coupled applications. Evaluation can be performed using generic SOIC-8 breakout boards or integrated into a precision analog signal chain prototyping area.

Also Consider

INA128UA TITexas Instruments - Offers similar performance but with a different gain equation and power profile for alternative precision requirements.
AD620ARZ Analog Devices - An industry-standard instrumentation amplifier often used in similar bridge-sensing and medical applications.

Categories

Analog ICs > Instrumentation Amplifiers