Texas Instruments INA332AIDGKRG4

Overview

INA332AIDGKRG4 from Texas Instruments is a rail-to-rail output, low-power CMOS instrumentation amplifier in an 8-pin VSSOP (DGK) package, configured with fixed gain of 5 V/V and supporting external gain adjustment up to 1000 V/V. It delivers 2.0 MHz bandwidth, 5 V/µs slew rate, 73 dB DC CMRR, ±0.5 pA input bias current, and operates from +2.7 V to +5.5 V single supply - ideal for precision sensor signal conditioning in battery-powered industrial and medical systems.

For engineers reviewing the INA332AIDGKRG4 datasheet, INA332AIDGKRG4 pinout, INA332AIDGKRG4 application, or INA332AIDGKRG4 equivalent, key selection criteria include its 415 µA quiescent current per channel, –55°C to +125°C operating range, shutdown mode drawing only 0.01 µA, and MSOP-8 footprint compatibility with space-constrained PCB layouts.

Technical Context

The INA332AIDGKRG4 implements a modified three-op-amp architecture with internal 5 V/V gain stage and externally programmable gain via R2/R1 resistors using G = 5 + 5(R2/R1). Its CMOS input stage enables ultra-low input bias current (±0.5 pA typical), while rail-to-rail output swing (to within 25 mV of rails at G ≥ 10) supports direct interfacing with SAR and sigma-delta ADCs.

Designed for single-supply operation, it maintains high common-mode rejection (73 dB DC, 50 dB at 45 kHz) and power-supply rejection (±250 µV/V max) across –55°C to +125°C. The REF pin defines output zero level and directly influences common-mode input range, requiring low-impedance connection to preserve CMRR.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 2.30 mm × 2.00 mm, 0.65 mm pitch, exposed thermal pad (not electrically connected), RoHS-compliant, MSL Level-2-260°C-1 year.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA333AIDGKR, the INA332AIDGKRG4 trades offset precision for lower cost and wider temperature qualification (–55°C to +125°C vs –40°C to +85°C); versus AD8221ARMZ, it provides single-supply flexibility and 0.01 µA shutdown but sacrifices maximum gain-bandwidth product.

Availability

INA332AIDGKRG4 is available at Aetrix Electronics and suitable for industrial sensor amplifiers, physiological signal acquisition, and A/D converter signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for INA332AIDGKRG4 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 over 90 years of innovation in precision signal chain solutions.

The INA332 family was designed for low-cost, low-power instrumentation in harsh environments - targeting industrial process control, portable medical devices, and battery-operated test equipment where rail-to-rail output, wide temp range, and shutdown capability are critical.

FAQ

What is the maximum gain achievable with INA332AIDGKRG4?

The INA332AIDGKRG4 supports externally programmable gain from 5 V/V up to 1000 V/V using the equation G = 5 + 5(R2/R1). At G = 1000, bandwidth reduces to ~10 kHz, and stability requires careful layout and feedback capacitor selection per Figure 8 in the SBOS216B datasheet. The internal 5 V/V gain stage remains fixed and cannot be disabled.

Does INA332AIDGKRG4 require external resistors for basic operation?

No - the INA332AIDGKRG4 operates at its default gain of 5 V/V with RG pin left open. External resistors R1 and R2 are only needed to achieve gains above 5 V/V. For G = 5, no external components are required beyond standard supply decoupling (0.1 µF ceramics on V+ and V– pins).

Can INA332AIDGKRG4 drive ADCs directly without a buffer?

Yes - the INA332AIDGKRG4's rail-to-rail output and 2.0 MHz bandwidth enable direct driving of capacitive-input ADCs like the ADS7818, provided load capacitance stays ≤100 pF and gain ≥10. For heavier capacitive loads (>500 pF) or low-impedance ADCs, an OPA340 buffer is recommended per Figure 5 in SBOS216B.

What is the function of the REF pin on INA332AIDGKRG4?

The REF pin sets the output voltage zero level and directly affects common-mode input range. It must be driven by a low-impedance source (<160 Ω) to maintain 73 dB CMRR. Applying a correction voltage to REF adds directly to VOUT with unity gain, enabling offset trimming - as shown in Figure 6 of the INA332 datasheet.

How does shutdown mode affect output behavior in INA332AIDGKRG4?

When the Shutdown pin is pulled below 0.8 V (at 5 V supply), the INA332AIDGKRG4 enters sleep mode within nanoseconds, reducing quiescent current to 0.01 µA. Output impedance rises significantly, placing the output in high-Z state - making it suitable for multiplexed sensor arrays where channel isolation is required during inactive periods.