INA155EA/250

Overview

The INA155EA/250 is a single-channel, single-supply instrumentation amplifier manufactured by Texas Instruments. It features rail-to-rail CMOS output and operates within a supply voltage range of 2.7 V to 5.5 V. Key electrical specifications include a gain bandwidth product of 550 kHz, a slew rate of 6.5 V/us, and a common-mode rejection ratio (CMRR) of 78 dB. The device offers fixed gains of 10 V/V or 50 V/V with a gain error of 0.05%. It has an input bias current of 50 pA, input offset voltage of 1 mV, and operates from -40°C to +85°C in an 8-pin VSSOP package.

Feature Summary

• Single-supply operation with rail-to-rail CMOS output capability
• Fixed internal gain options of 10 V/V or 50 V/V
• High input impedance with low input bias current
• Low power consumption suitable for battery-operated systems

Applications

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

Procurement Notes

Verify the specific suffix 'G4' for lead-free compliance when ordering. Confirm the exact gain configuration required (10 V/V or 50 V/V) as this is determined by the part number variant. Ensure the VSSOP-8 package matches the PCB footprint design. Check humidity sensitivity levels for proper storage and handling procedures during assembly.

Selection Notes

Select this component for applications requiring high input impedance and low power consumption in a small form factor. The fixed gain options simplify circuit design by eliminating external precision resistors. Consider the 550 kHz bandwidth and 78 dB CMRR for moderate-speed, noise-sensitive signals. Verify that the rail-to-rail output swing meets the dynamic range requirements of the subsequent ADC or processing stage.

Part Context

The INA155 belongs to Texas Instruments' family of single-supply instrumentation amplifiers designed for low-power applications. It integrates precision matched resistors internally to provide stable fixed gains. The VSSOP-8 package allows for compact board layouts compared to traditional DIP packages. This series targets cost-sensitive and space-constrained designs where external gain-setting components are undesirable.

Replacement Considerations

Check for other INA155 variants with different gain settings or packaging options. Verify compatibility with alternative single-supply instrumentation amplifiers offering similar bandwidth and CMRR if pin-out differences are acceptable.