INA141U/2K5G4

Overview

The INA141U/2K5G4 is a precision, low-power instrumentation amplifier manufactured by Texas Instruments. It features fixed internal gain options of 10 V/V or 100 V/V, selectable via external pins. The device operates on a single supply voltage ranging from 3V to 36V. Key electrical specifications include a maximum input offset voltage of 75 µV and a maximum input bias current of 2 nA. It provides a common-mode rejection ratio (CMRR) of 98 dB at G=10 and 110 dB at G=100. The unit is housed in an 8-pin SOIC package and supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Fixed internal gain configuration available at 10 V/V or 100 V/V for simplified circuit design
• High common-mode rejection ratio ensuring accurate signal amplification in noisy environments
• Low power consumption suitable for battery-operated and portable applications
• Single-supply operation capability with wide voltage range support

Applications

• Industrial process control sensor signal conditioning
• Medical equipment data acquisition systems
• Precision measurement instrumentation
• Strain gauge and bridge sensor interfaces

Procurement Notes

Verify the specific gain setting required for your application, as the INA141U/2K5G4 offers fixed gain options. Confirm that the SOIC-8 package aligns with your PCB footprint requirements. Ensure the operating temperature range meets your environmental specifications. Check for RoHS compliance status if mandated by your project regulations. Validate supply voltage constraints against the device's 3V to 36V operational limits.

Selection Notes

Select this component when a fixed gain instrumentation amplifier is preferred over adjustable gain topologies to reduce external component count. It is suitable for applications requiring high CMRR and low power consumption. Consider the fixed gain limitation; if variable gain is needed, alternative models like the INA118 may be more appropriate. Evaluate the input offset voltage and drift characteristics against your precision requirements.

Part Context

The INA141 belongs to Texas Instruments' family of precision instrumentation amplifiers designed for low-power applications. It integrates the reference amplifier and feedback resistors internally, simplifying the design compared to three-op-amp architectures. The U suffix indicates the SOIC package variant, while /2K5 denotes reel packaging quantities. This part serves as a robust solution for industrial and medical sensing interfaces where stability and low power are critical.

Replacement Considerations

The INA118 is a comparable adjustable-gain instrumentation amplifier from Texas Instruments but requires external resistors for gain setting. The INA141UA is the same device in a different package variant. Verify pin compatibility and gain accuracy differences when substituting.