INA155U

Overview

The Texas Instruments INA155U is a single-channel, precision instrumentation amplifier featuring CMOS input technology and rail-to-rail output capability. It operates on a single supply voltage ranging from 2.7 V to 5.5 V with a typical operating current of 1.7 mA. Key electrical specifications include a gain bandwidth product of 550 kHz, a slew rate of 6.5 V/µs, and a common-mode rejection ratio (CMRR) of 78 dB. The device offers low input bias current of 50 pA and an input offset voltage of 1 mV. It is available in an SOIC-8 surface-mount package and supports fixed gains of 10 V/V and 50 V/V.

Feature Summary

• Single-supply operation with rail-to-rail output swing for maximum dynamic range
• CMOS input stage providing high input impedance and low power consumption
• Precision performance with low input offset voltage and bias current

Applications

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

Procurement Notes

Verify the specific ordering suffix (e.g., /2K5) against the manufacturer's datasheet to confirm packaging type and reel quantity requirements. Ensure the selected variant matches the required temperature range and pinout configuration for your PCB layout. Cross-reference the manufacturer part number with distributor listings to confirm availability and authenticity before procurement.

Selection Notes

Select this component when a cost-effective, single-supply instrumentation amplifier with rail-to-rail output is required. It is suitable for applications needing moderate bandwidth (550 kHz) and precision (1 mV Vos). Consider the SOIC-8 package for standard surface-mount assembly. Evaluate if the fixed gain options meet system requirements or if external gain setting is needed.

Part Context

The INA155U belongs to the INA155 family of instrumentation amplifiers designed for general-purpose precision applications. This series emphasizes low power consumption and ease of use in single-supply environments. The U suffix typically denotes the SOIC-8 package variant within the Texas Instruments linear integrated circuit portfolio.

Replacement Considerations

Check for direct pin-compatible alternatives such as the INA155EA or INA155E variants if different packaging (VSSOP-8) or tape-and-reel quantities are preferred. Verify that substitute parts maintain the same gain options and electrical characteristics.