INA132U

Overview

The INA132U is a low-power, single-supply difference amplifier manufactured by Texas Instruments. It integrates a precision operational amplifier with an internal laser-trimmed resistor network to provide a fixed unity 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 specifications include a -3dB bandwidth of 300kHz, a slew rate of 100mV/µs, and a maximum input offset voltage of 75µV. It delivers an output current of 12mA per channel with a typical quiescent current of 160µA. The component functions within an extended industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrates a precision op amp with laser-trimmed internal resistors for accurate unity gain and high common-mode rejection without external components.
• Features an internal operational amplifier with a common-mode range extending to the negative rail, optimizing suitability for single-supply applications.
• Provides excellent temperature stability through superior tracking of the internal resistor temperature coefficients (TCR), maintaining gain accuracy and CMRR across varying thermal conditions.

Applications

• Current sensing circuits utilizing shunt resistors
• Isolated signal transmission systems
• Data acquisition front-ends requiring differential-to-single-ended conversion

Procurement Notes

Verify the specific ordering suffix when purchasing, as variations such as /2K5 indicate tape-and-reel packaging while standard suffixes may denote tube packaging. Confirm that the required package type matches the target PCB footprint. Ensure the selected variant meets the necessary humidity sensitivity level requirements for the intended manufacturing process. Cross-reference the manufacturer part number against official datasheets to validate pinout compatibility and functional specifications before integration.

Selection Notes

Select the INA132U when a fixed unity gain differential amplifier is required for low-power applications. This component is appropriate for designs needing high common-mode rejection in single-supply environments where external precision resistor matching is undesirable. Consider this part for cost-sensitive solutions that still demand precise gain accuracy and stable performance over the extended industrial temperature range.

Part Context

The INA132U belongs to the INA132 family of difference amplifiers designed to simplify circuit design by eliminating the need for discrete matched resistor networks. Manufactured by Texas Instruments, this series provides a compact alternative to traditional discrete differential amplifier configurations. The U suffix identifies the SOIC-8 surface-mount package variant, offering a space-efficient solution for modern electronic assemblies compared to larger through-hole packages.

Replacement Considerations

Check for direct equivalents within the same product family or other TI difference amplifiers if pinout compatibility is critical. Verify that any substitute maintains the required unity gain configuration and single-supply operation capabilities. Ensure the replacement component supports the necessary bandwidth and common-mode voltage range for the specific application context.