Texas Instruments INA233AIDGST

Overview

INA233AIDGST from Texas Instruments is a 16-bit ultra-precise current, voltage, power, and energy monitor IC with I²C/SMBus/PMBus interface, supporting high-side or low-side shunt sensing across 0V–36V bus voltages. It delivers 0.1% max gain error, 10µV max shunt offset, and integrated power accumulator for energy metering - deployed in server power rails and telecom power supplies.

For engineers reviewing the INA233AIDGST datasheet, INA233AIDGST pinout, INA233AIDGST application, or INA233AIDGST equivalent, key selection criteria include its 16-bit ΔΣ ADC accuracy, programmable averaging (1–1024 samples), independent alert thresholds for current/voltage/power, 1.8V–5.5V digital interface compliance, and VSSOP-10 package thermal performance (R_θJA = 171.4°C/W).

Technical Context

The INA233AIDGST integrates a multiplexed 16-bit delta-sigma ADC that interleaves shunt voltage (IN+, IN−) and bus voltage (VBUS) measurements to minimize timing skew in power calculation. Its internal multiplier and calibration register enable direct readout of current in amperes and power in watts without host-side computation.

It supports continuous or triggered conversion modes, programmable conversion times (140µs–8.24ms), and power-down mode (2µA typical). The ALERT pin reports simultaneous overcurrent, overpower, bus over/undervoltage, and ADC overflow events via PMBus-standard status registers.

Key Specifications

Pinout & Package

INA233AIDGST is housed in a 10-pin DGS (VSSOP) package measuring 3.00mm × 4.90mm, optimized for thermal dissipation (R_θJA = 171.4°C/W) and PCB space-constrained power rail monitoring.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current/voltage/power monitoring applications.

Compared with INA226AIDRCT and MAX34451ETL+, the INA233AIDGST uniquely combines 16-bit precision, integrated energy accumulation, and 1.8V digital compatibility in a VSSOP-10 package - making it optimal for space-constrained, high-accuracy server and telecom power metering where autonomous Wh reporting is critical.

Availability

INA233AIDGST is available at Aetrix Electronics and suitable for server power management, telecom rectifier modules, and industrial DIN-rail power supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for INA233AIDGST 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 sensing and power management ICs.

The INA233AIDGST belongs to TI's high-accuracy current-sense monitor product line, designed specifically for real-time, multi-parameter power telemetry in mission-critical infrastructure where reliability, metrology-grade accuracy, and digital bus interoperability are mandatory.

FAQ

What is the maximum bus voltage the INA233AIDGST can measure?

The INA233AIDGST supports a bus voltage input range of 0V to 36V on the VBUS pin. Although the internal ADC scaling accommodates up to 40.96V full-scale, the absolute maximum rating for VBUS is 40V, and operational use above 36V violates recommended conditions. This makes the INA233AIDGST ideal for 12V, 24V, and 36V industrial and telecom power systems without external attenuation.

Does the INA233AIDGST support energy metering, and how is it implemented?

Yes, the INA233AIDGST implements energy metering via an integrated hardware power accumulator accessible through the READ_EIN PMBus command. It records total accumulated power (in µJ) and corresponding sample count, enabling direct Wh calculation without host-side integration. This eliminates firmware complexity and timing errors associated with software-based energy summation, making the INA233AIDGST suitable for UL-certifiable metering applications.

Can the INA233AIDGST operate with a 1.8V I²C bus, and what are the voltage thresholds?

Yes, the INA233AIDGST is fully compliant with 1.8V I²C/SMBus/PMBus interfaces. Its digital pins (SDA, SCL, ALERT, A0, A1) accept VIH ≥ 1.4V and VIL ≤ 0.4V, ensuring reliable communication with 1.8V logic families. This eliminates the need for external level shifters when interfacing with low-voltage FPGAs or application processors, simplifying design and improving signal integrity.

How does the INA233AIDGST handle high-noise environments like switch-mode power supplies?

The INA233AIDGST mitigates noise through programmable conversion times (140µs–8.24ms) and averaging (1–1024 samples), leveraging its delta-sigma ADC architecture with inherent 500kHz sampling rejection. Combined with 126dB CMRR and independent shunt/bus measurement interleaving, it maintains accuracy even in noisy 100kHz–1MHz SMPS environments - verified in TI's typical characteristics plots for offset vs. temperature and gain error vs. common-mode voltage.

What is the thermal performance of the INA233AIDGST in its VSSOP-10 package?

The INA233AIDGST in the DGS (VSSOP-10) package has a junction-to-ambient thermal resistance (R_θJA) of 171.4°C/W, junction-to-board (R_θJB) of 91.8°C/W, and junction-to-case (top) (R_θJC(top)) of 42.9°C/W. These values are measured per JEDEC JESD51 standards and confirm suitability for compact, thermally constrained layouts - especially when paired with 2oz copper pours under the exposed pad (GND) for enhanced heat dissipation.