Texas Instruments INA223AIDSKT

Overview

INA223AIDSKT from Texas Instruments is a voltage-output, zero-drift current shunt and bus voltage monitor with integrated analog multiplier for instantaneous power calculation. It operates from 2.7 V to 5.5 V supply, supports 0 V to 26 V common-mode input range, delivers ±0.25% shunt voltage gain error (max), ±0.15% bus voltage gain error (max), and 1.25% power measurement error (max), and is used in precision power management of portable electronics and telecom power rails.

For engineers reviewing the INA223AIDSKT datasheet, INA223AIDSKT pinout, INA223AIDSKT application, or INA223AIDSKT equivalent, key selection criteria include programmable shunt voltage gains (20/128/300 V/V), selectable bus voltage attenuations (0.1/0.2/0.4 V/V), two-wire interface configurability, shutdown current ≤1 µA, and SON-10 package thermal performance (θJA = 47.5°C/W).

Technical Context

The INA223AIDSKT implements a zero-drift amplifier architecture with 0.3 µV/°C max offset drift and 50 ppm/°C max gain drift, enabling accurate low-side and high-side current sensing down to 10 mV full-scale shunt drop. Its analog multiplier core computes instantaneous power by multiplying scaled shunt voltage and attenuated bus voltage signals before outputting a single-ended analog voltage on VOUT.

Configuration is performed via a two-wire (SMBus-compatible) interface controlling an internal multiplexer, gain-select registers (GSV0/GSV1, GBV0/GBV1), and enable/disable state. The device supports four output modes - bus voltage, shunt voltage, supply power, and load power - each requiring valid linear-range inputs to ensure measurement integrity.

Key Specifications

Pinout & Package

INA223AIDSKT is housed in a 3 mm × 3 mm, 10-pin SON (Small Outline No-lead) package with exposed thermal pad (DSK suffix). The package supports high-density PCB layouts and provides low thermal resistance (θJB = 21.5°C/W) for stable operation under continuous load conditions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current shunt and bus voltage monitoring applications.

Compared with INA226AIDGST and INA219AIDR, the INA223AIDSKT uniquely delivers analog instantaneous power output with zero-drift stability, enabling deterministic response time and eliminating host processor dependency - essential for closed-loop power control in embedded systems.

Availability

INA223AIDSKT is available at Aetrix Electronics and suitable for notebook computers, telecom equipment, and industrial power management systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for INA223AIDSKT 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 INA223 belongs to TI's high-accuracy current-sense amplifier product line, designed specifically for real-time power telemetry in space-constrained, thermally demanding applications where analog immediacy and drift-free performance are mandatory.

FAQ

What is the maximum common-mode voltage the INA223AIDSKT can measure?

The INA223AIDSKT supports a common-mode input range of 0 V to +26 V, independent of its 2.7 V to 5.5 V supply voltage. This allows direct monitoring of 12 V and 24 V bus rails without level-shifting circuitry. The specification is guaranteed across the full operating temperature range (–40°C to +105°C) and applies to both VIN+ and VIN− pins simultaneously.

How does the two-wire interface configure the INA223AIDSKT output signal?

The two-wire (SMBus-compatible) interface of the INA223AIDSKT controls a configuration register that selects the output signal via bits OUT1/OUT0: 00 = bus voltage, 01 = shunt voltage, 10 = supply power, 11 = load power. The default power-on state is supply power mode. Configuration persists through power cycles unless overwritten.

Can the INA223AIDSKT accurately measure power with a 1 mΩ shunt resistor at 5 A load?

Yes. With 5 A through a 1 mΩ shunt, the differential voltage is 5 mV. Using the INA223AIDSKT's 300 V/V shunt gain setting yields a 1.5 V output - well within its linear range and above noise floor. Combined with 0.2 V/V bus attenuation on a 12 V rail, power accuracy remains within ±1.25% FSR per datasheet specifications.

What is the purpose of the dual VIN+ and VIN− pins on the INA223AIDSKT?

The INA223AIDSKT features two VIN+ pins (9 and 10) and two VIN− pins (1 and 2) to support true Kelvin (4-wire) shunt connections. This minimizes errors from PCB trace resistance and contact impedance, preserving the ±100 µV max offset and enabling accurate sub-millivolt differential measurements critical for low-value shunts.

Does the INA223AIDSKT require external components for stable operation?

Yes. A 0.1 µF ceramic bypass capacitor must be placed between VS and GND, as close as possible to the device pins, to ensure stability and noise immunity. Additionally, SCL and SDA lines require a 4.7 kΩ pull-up resistor to VS. No external gain-setting resistors or compensation networks are needed - all configuration is internal and programmable.