Texas Instruments INA332AIDGKT

Overview

INA332AIDGKT from Texas Instruments is a rail-to-rail output, low-power CMOS instrumentation amplifier optimized for single-supply sensor signal conditioning. It delivers 2.0MHz bandwidth, 5V/µs slew rate, 73dB DC CMRR, ±0.5pA input bias current, and 415µA quiescent current per channel - enabling high-precision bridge, RTD, and ECG amplification in battery-powered industrial and medical systems.

For engineers reviewing the INA332AIDGKT datasheet, INA332AIDGKT pinout, INA332AIDGKT application, or INA332AIDGKT equivalent, this page provides verified technical context, gain configuration guidance, shutdown behavior, rail-to-rail output limits, and real-world use cases with design-meaning specifications - all confirmed against TI SBOS216B (Oct 2006) and official ordering documentation.

Technical Context

The INA332AIDGKT implements a modified two-op-amp instrumentation architecture with an integrated third gain stage, enabling fixed G = 5 internal gain plus externally programmable gain via R₂/R₁ resistors using G = 5 + 5(R₂/R₁). Its CMOS input stage achieves ±0.5pA bias current and 10¹³Ω input impedance, supporting high-impedance sensors without loading error.

It operates from +2.7V to +5.5V single supply, features a dedicated REF pin defining output zero level, and enters sub-1µA shutdown mode when the Shutdown pin drops below 0.8V (at V_S = 5V). Output swings to within 25mV of rails at G ≥ 10 into ≥10kΩ loads, and maintains 50dB CMRR up to 45kHz for line-noise rejection in noisy environments.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3.0mm × 3.0mm, 0.65mm pitch, thin-profile surface-mount package optimized for space-constrained PCB layouts in portable and modular instrumentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA333AIDGKT, the INA332AIDGKT trades minor gain accuracy and noise for lower unit cost and identical footprint - making it preferred for volume industrial sensor nodes. Against AD8221ARMZ, the INA332AIDGKT delivers 3.5× lower quiescent current and integrated shutdown, but requires single-supply operation and accepts lower bandwidth demands.

Availability

INA332AIDGKT is available at Aetrix Electronics and suitable for industrial sensor amplifiers, portable medical devices, and low-power data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for INA332AIDGKT 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 signal chain solutions.

The INA332 family was designed specifically for cost-sensitive, low-power instrumentation applications - delivering rail-to-rail output, micropower shutdown, and high CMRR in miniature MSOP/VSSOP packages for space-constrained sensor front-ends.

FAQ

What is the maximum gain achievable with INA332AIDGKT?

The INA332AIDGKT supports externally programmable gain from 5V/V to 1000V/V using the equation G = 5 + 5(R₂/R₁). With R₂ = 190kΩ and R₁ = 10kΩ, G = 100 is achieved; R₂ = 100kΩ and R₁ = 100Ω yields G = 5005 - though stability and bandwidth degrade above G = 100. The datasheet specifies 5–1000V/V as the functional range.

Does INA332AIDGKT support true rail-to-rail input common-mode range?

No. The INA332AIDGKT has a limited input common-mode range: at V_S = 5V, it is 0.55V to 3.8V (i.e., 1.2V below V+ and above V–). The upper limit is constrained by the second-stage amplifier's headroom. Operation outside this range causes reduced CMRR and increased distortion - the REF pin voltage directly affects usable input range per the equation V_OA1 = 5/4 V_CM – 1/4 V_REF.

How does the REF pin affect INA332AIDGKT performance?

The REF pin defines the output's zero-reference level and directly impacts common-mode input range, CMRR, and offset trimming. A series impedance >160Ω degrades CMRR to 50dB. Applying a correction voltage to REF adds +1× gain to offset - enabling precise trimming. For single-supply operation, REF is typically set to V_S/2 (e.g., 2.5V on 5V rail) to maximize output swing.

Can INA332AIDGKT drive capacitive loads like ADC inputs?

Yes, but with limitations. The INA332AIDGKT can directly drive capacitive loads ≤100pF while maintaining stability and 0.1% settling in 1.7µs. For larger loads (e.g., 1000pF ADC inputs), external compensation (e.g., feedback capacitor C_F satisfying R_IN·C_IN = R_F·C_F) is required to prevent overshoot and ensure monotonic settling - as shown in Figure 8 of SBOS216B.

What is the thermal resistance (θ_JA) of the INA332AIDGKT package?

The INA332AIDGKT in VSSOP-8 (DGK) package has a specified junction-to-ambient thermal resistance θ_JA of 150°C/W under standard JEDEC test conditions (2-layer board, 1in² copper). This value assumes no additional copper pour or thermal vias; adding 2–4 thermal vias beneath the exposed pad (if present) can reduce θ_JA by 20–30°C/W in production layouts.