INA2128UA/1KG4

Overview

The INA2128UA/1KG4 is a dual-channel, low-power instrumentation amplifier manufactured by Texas Instruments. It features a standard three-op-amp architecture with laser-trimmed precision, offering a maximum input offset voltage of 50 µV and drift of 0.5 µV/°C. The device provides a gain bandwidth product of 1.3 MHz and a slew rate of 4 V/µs. It operates on supply voltages ranging from 4.5 V to 36 V (±2.25 V to ±18 V) with a total quiescent current of 1.4 mA for both channels. The unit is housed in a 16-SOIC package and supports an operating temperature range of -40°C to +85°C.

Feature Summary

• Dual-channel configuration within a single compact package
• High precision with laser-trimmed low offset voltage and drift
• Internal input protection capable of withstanding ±40V without damage
• Low power consumption suitable for battery-operated systems

Applications

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

Procurement Notes

Verify the specific suffix 'G4' against the manufacturer's current active part list, as this designation may indicate a legacy or discontinued variant compared to the standard 'INA2128UA/1K'. Confirm RoHS compliance status and moisture sensitivity level (MSL 3) prior to procurement. Ensure the source documentation explicitly lists this exact part number as available or recommended, rather than relying on generic family listings.

Selection Notes

Select this component when dual-channel instrumentation is required in a space-constrained design. It is appropriate for applications demanding high accuracy with minimal external components due to internal trimming. Consider the 1.3 MHz bandwidth and 4 V/µs slew rate for signal integrity requirements. Verify that the 16-SOIC footprint matches the PCB layout constraints and that the ±40V input protection meets the system's fault tolerance needs.

Part Context

This device belongs to the INA2128 family of general-purpose instrumentation amplifiers. It shares the core three-op-amp topology with other members like the INA2126 but offers higher speed and precision characteristics. The 'UA' indicates the surface-mount SOIC package, while '/1K' typically denotes tape-and-reel packaging. The 'G4' suffix often relates to environmental compliance or manufacturing revision history within Texas Instruments' nomenclature.

Replacement Considerations

Texas Instruments recommends the INA2128UA/1K as a direct substitute for the INA2128UA/1KG4. Both parts share identical electrical specifications and pinouts. Verify that the replacement part number is currently in production and available in the required packaging format.