INA155UA

Overview

The INA155UA is a single-supply, rail-to-rail output CMOS instrumentation amplifier manufactured by Texas Instruments. It operates within a supply voltage range of 2.7 V to 5.5 V and features a 550 kHz bandwidth with a slew rate of 6.5 V/us. The device offers selectable gains of 10 V/V or 50 V/V, achieving a gain error of 0.05%. Key electrical characteristics include a common-mode rejection ratio (CMRR) of 78 dB, an input bias current of 50 pA, and an input offset voltage of 1 mV. It draws 1.7 mA of operating current and functions reliably across temperatures from -40°C to +85°C.

Feature Summary

• Single-supply operation with rail-to-rail output capability for maximum dynamic range in low-voltage systems
• Integrated precision resistors providing fixed gains of 10 V/V or 50 V/V with minimal gain error
• High input impedance CMOS architecture ensuring negligible loading on signal sources

Applications

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

Procurement Notes

Verify the specific package type and temperature grade against the datasheet before procurement. Confirm that the selected variant matches the required gain setting and operational voltage constraints. Ensure compliance with RoHS directives if applicable to the manufacturing environment.

Selection Notes

Select this component when high input impedance and low power consumption are critical alongside moderate bandwidth requirements. The fixed gain options simplify circuit design by eliminating external resistor matching. Consider the rail-to-rail output feature for maximizing signal swing in single-supply applications.

Part Context

This part belongs to the INA155 family of instrumentation amplifiers designed for precision measurement applications. It complements other Texas Instruments amplifiers like the OPA355 series by offering integrated gain settings rather than requiring external feedback networks for basic amplification tasks.

Replacement Considerations

The INA155E/250 serves as a verified alternative within the same product family, sharing identical core specifications and functionality.