Texas Instruments INA132UA

Overview

INA132UA from Texas Instruments is a low-power, unity-gain precision difference amplifier optimized for single-supply operation (2.7V to 36V), delivering ±0.075% max gain error, 90dB typical CMRR, and 175µA quiescent current. It integrates laser-trimmed resistors and an internal op amp with rail-to-rail common-mode input range extending to the negative supply - enabling accurate differential signal conditioning in industrial instrumentation, optical modules, and PLC analog input stages.

For engineers reviewing the INA132UA datasheet, INA132UA pinout, INA132UA application, or INA132UA equivalent, key selection criteria include its guaranteed CMRR over temperature, low offset drift (±1 µV/°C), stable operation with up to 10,000 pF capacitive load, and SOIC-8 packaging compatible with automated assembly and industrial thermal cycling requirements.

Technical Context

The INA132UA implements a monolithic difference amplifier architecture with on-die laser-trimmed thin-film resistor network (40kΩ ratio-matched pairs) and a precision op amp core. Its input stage supports common-mode voltages down to V–, enabling true single-supply operation without level-shifting circuitry.

Gain is fixed at unity (G = 1) with laser-trimmed resistor ratios ensuring <0.001% nonlinearity and maintaining ≥76dB CMRR across –40°C to +85°C. The device exhibits stable small-signal bandwidth of 300kHz and slew rate of 0.1–0.25 V/µs depending on chip site origin (SHE/TID), with overload recovery under 7µs.

Key Specifications

Pinout & Package

INA132UA is housed in an industry-standard SOIC-8 (D package), 4.9mm × 6mm body size, RoHS-compliant with NiPdAu lead finish and MSL Level-3 moisture sensitivity rating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar difference amplifier applications.

Compared with INA133UA and AD629ARZ, the INA132UA uniquely balances ultra-low quiescent current (175µA), guaranteed CMRR over temperature, and fully integrated laser-trimmed gain - making it the preferred choice for space-constrained, battery-aware, and thermally variable industrial signal chains where 300kHz bandwidth suffices.

Availability

INA132UA is available at Aetrix Electronics and suitable for optical module monitoring, PLC analog input modules, and lab instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC-8 packaging.

Supply support for INA132UA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision amplifiers and signal-conditioning ICs.

The INA132 product line was designed specifically for industrial and instrumentation applications demanding low-power, high-accuracy differential signal acquisition in single-supply systems - emphasizing laser-trimmed resistor stability, wide supply flexibility, and robust ESD performance.

FAQ

What is the maximum common-mode input voltage range for INA132UA?

The INA132UA supports a common-mode input voltage range from V– to 2×V+ – 2V. At ±15V supplies, this extends from –15V to +28V; at +5V single supply, it covers 0V to +8V. This rail-to-negative-supply input capability enables direct interfacing with ground-referenced sensors without external biasing networks - a key enabler for single-supply industrial designs using the INA132UA.

Does INA132UA require external trimming for offset voltage?

No, the INA132UA does not require external offset trimming. It is factory laser-trimmed to achieve ±75µV maximum input offset voltage (INA132 grade) and ±1 µV/°C maximum drift over –40°C to +85°C. Most applications operate within specification without adjustment; however, Pin 1 (Ref) supports optional external nulling via a low-impedance buffered voltage source if sub-µV residual offset is required in metrology-grade systems using the INA132UA.

Can INA132UA drive a 10kΩ load at ±15V supply?

Yes, the INA132UA delivers full linear output swing into a 10kΩ load at ±15V supply: positive swing reaches (V+) – 0.8V = +14.2V, and negative swing reaches (V–) + 0.25V = –14.75V. This 28.95V total swing exceeds standard 16-bit DAC or ADC input ranges. The device maintains ±0.075% gain accuracy under these conditions, making it suitable for driving precision data converters directly - a verified operating condition documented in the INA132UA datasheet.

What is the significance of the 'A' suffix in INA132UA?

The 'A' suffix in INA132UA denotes the enhanced-grade version with tighter initial offset voltage (±75µV max vs. ±150µV for standard INA132U) and improved CMRR (76dB min vs. 70dB min). It also specifies operation over the full industrial temperature range (–40°C to +85°C) and RoHS-compliant NiPdAu lead finish. All INA132UA units are manufactured in either CSO:SHE or CSO:TID fabrication flows, with electrical specs guaranteed across both - confirming consistent performance for production use of the INA132UA.

Is INA132UA pin-compatible with INA132U?

Yes, INA132UA is pin-compatible with INA132U - both use identical SOIC-8 (D) packaging and share identical pin functions, thermal characteristics, and PCB footprint. The 'A' variant adds tighter specifications and RoHS compliance but requires no layout changes. However, note that INA132U is marked obsolete in TI's packaging addendum, while INA132UA/2K5.B remains active - making INA132UA the recommended production part for new designs requiring long-term supply assurance and enhanced precision.