INA2128UA/1K

Overview

The INA2128UA/1K is a dual-channel, low-power instrumentation amplifier manufactured by Texas Instruments. It features a universal three-op-amp architecture with laser-trimmed precision, offering a maximum input offset voltage of 50µV and drift of 0.5µV/°C. The device provides a gain bandwidth product of 1.3MHz and a slew rate of 4V/µs. Gain is adjustable from 1V/V to 10,000V/V via a single external resistor. Internal input protection withstands ±40V without damage. It operates on supply voltages ranging from ±2.25V to ±18V, consuming only 700µA per channel. The component is housed in a 16-SOIC package and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Dual-channel low-power instrumentation amplifier design
• High precision with laser-trimmed low offset voltage and drift
• Internal input protection against high common-mode voltages
• Single-resistor programmable gain capability

Applications

• Sensor signal conditioning for thermocouples and RTDs
• Medical instrumentation systems
• Multi-channel data acquisition systems
• Battery-powered measurement devices

Procurement Notes

Verify the specific suffix '1K' indicates tape-and-reel packaging when ordering. Confirm RoHS compliance status as manufacturing processes may evolve. Ensure the 16-SOIC footprint matches the target PCB layout. Cross-reference the manufacturer part number with authorized distributors to avoid obsolete variants like the G4 suffix which may have different availability or specifications.

Selection Notes

Select this component for applications requiring dual channels with high accuracy and low power consumption. The wide gain range suits various sensor interfaces. Consider the 16-pin SOIC package constraints for board space. Verify that the required bandwidth exceeds 200kHz at higher gains if speed is critical. Ensure supply voltage limits accommodate the system's rail voltages.

Part Context

This part belongs to the INA2128 family of instrumentation amplifiers. It shares architectural similarities with the single-channel INA128 but offers two independent circuits in one package. The device is designed for general-purpose use where precision and low power are prioritized over ultra-high speed. It complements other TI instrumentation amplifiers in the portfolio for scalable system designs.

Replacement Considerations

The INA2128UA/1KG4 is an equivalent variant often listed as a manufacturer-recommended substitute. Verify pinout compatibility and electrical specifications before substitution. Check for any changes in packaging or moisture sensitivity levels between the standard and G4 suffix versions.