INA132UA

Overview

The INA132UA is a low-power, single-supply difference amplifier manufactured by Texas Instruments. It integrates a precision operational amplifier with a laser-trimmed resistor network to provide a fixed gain of 1 V/V. The device operates on a single supply voltage ranging from 2.7V to 36V or dual supplies from ±1.35V to ±18V. Key electrical parameters include a gain-bandwidth product of 300 kHz, a slew rate of 0.1 V/µs, and an input bias voltage of 75 µV. It features a common-mode rejection ratio of 70 dB and draws 160 µA of operating current. The component is housed in an 8-pin SOIC package and functions within an extended industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrates a precision op amp with a laser-trimmed internal resistor network for accurate gain and high common-mode rejection without external components.
• Operates effectively in single-supply applications due to the internal op amp's common-mode range extending to the negative rail.
• Maintains gain accuracy and common-mode rejection across temperature variations through excellent tracking of the internal resistor temperature coefficients.

Applications

• Current sensing circuits requiring differential voltage measurement.
• Bridge sensor signal conditioning for strain gauges and load cells.
• Isolated amplification in data acquisition systems.

Procurement Notes

Verify the specific ordering suffix to confirm the packaging format, as the /2K5 designation indicates reel packaging. Ensure compatibility with the required surface-mount technology (SMD/SMT) installation style. Confirm that the 8-pin SOIC package dimensions align with the target PCB footprint. Check for moisture sensitivity levels if reflow soldering processes are utilized in the manufacturing workflow.

Selection Notes

Select this component when a fixed unity gain differential amplifier is required for low-power applications. It is suitable for designs needing operation from a single supply down to 2.7V. Consider the 300 kHz bandwidth and 0.1 V/µs slew rate for signal integrity requirements. The 70 dB CMRR is adequate for general-purpose isolation but may require external trimming for higher precision needs compared to dedicated instrumentation amplifiers.

Part Context

The INA132 belongs to a family of low-power difference amplifiers designed to replace discrete resistor networks. This integration simplifies circuit design by providing matched resistors with tight tolerance and temperature tracking. The UA suffix denotes the SOIC-8 surface-mount package variant, distinguishing it from DIP versions. It serves as a cost-effective solution for basic differential signal processing tasks in industrial and consumer electronics.

Replacement Considerations

Direct substitutes include the INA132UAE4 and INA132UAG4 variants, which maintain identical electrical specifications. Verify pinout compatibility and thermal performance when transitioning between these specific part numbers.