INA118UB/2K5G4

Overview

The INA118UB/2K5G4 is a precision, low-power instrumentation amplifier manufactured by Texas Instruments. It features a single channel with a common-mode rejection ratio of 107 dB and an input bias current of 5 nA. The device operates on supply voltages ranging from 2.7 V to 36 V while consuming only 350 µA of quiescent current. Key electrical specifications include a 3-dB bandwidth of 800 kHz, a slew rate of 900 mV/µs, and an input offset voltage of 50 µV. It is housed in an 8-SOIC surface-mount package and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Provides high-precision signal amplification with low power consumption suitable for battery-operated systems.
• Delivers high common-mode rejection to accurately amplify small differential signals in noisy environments.
• Features wide single-supply operation capability for flexible integration into various circuit designs.

Applications

• Precision sensor signal conditioning
• Medical instrumentation front-ends
• Industrial process control systems

Procurement Notes

Verify the specific suffix G4 indicates RoHS compliance status as per manufacturer documentation. Confirm the /2K5 designation corresponds to reel packaging quantities. Ensure the UB variant matches the required performance grade for your application. Cross-reference the datasheet revision date to confirm technical parameters have not changed. Validate that the SOIC-8 package dimensions align with your PCB footprint requirements.

Selection Notes

Select this component when high accuracy and low power are critical constraints. The 800 kHz bandwidth supports moderate-speed applications requiring precise gain settings. Consider the 50 µV offset voltage for DC-coupled measurements where drift must be minimized. The wide supply voltage range allows compatibility with both single and dual supply architectures without level shifting.

Part Context

This part belongs to the INA118 family of instrumentation amplifiers known for their unity-gain stability and external resistor gain setting. The UB sub-series typically denotes a specific performance bin or temperature grade within the standard INA118 line. It serves as a direct replacement for older Burr-Brown branded INA118 devices after Texas Instruments acquired the product line.

Replacement Considerations

• INA118U
• INA118UB

FAQ

How is the gain of the INA118UB/2K5G4 configured?

The gain is set externally using a single precision resistor connected between the RG pins, allowing for flexible gain adjustment from 1 V/V to infinity.

What is the maximum input resistance of this amplifier?

The device features a maximum input resistance of 10 GOhms, which minimizes loading effects on high-impedance signal sources.