Texas Instruments INA219AIDCNRG4

Overview

INA219AIDCNRG4 from Texas Instruments is a zero-drift, bidirectional current/power monitor IC with I²C/SMBus interface, sensing shunt voltage (±320 mV full-scale) and bus voltage (0–26 V), delivering 12-bit current/voltage/power readings with ±0.5% max current measurement error over temperature. It operates from 3–5.5 V supply and supports real-time power monitoring in server power rails.

For engineers reviewing the INA219AIDCNRG4 datasheet, INA219AIDCNRG4 pinout, INA219AIDCNRG4 application, or INA219AIDCNRG4 equivalent, key selection considerations include its programmable PGA gain (/1 to /8), 16 I²C addresses, integrated power calculation engine, and SOT-23-8 package suitability for space-constrained DC/DC output monitoring.

Technical Context

The INA219AIDCNRG4 integrates a delta-sigma ADC with programmable gain amplifier (PGA) and internal multiplier to compute current (A) and power (W) directly from shunt and bus voltage measurements. Its dual-channel conversion supports independent averaging settings for shunt and bus voltage-up to 128 samples-with configurable resolution (9–12 bit) and conversion timing (84–586 µs).

It implements SMBus timeout detection (28–35 ms), supports Power-Down mode (6–15 µA quiescent current), and features input protection rated for ±26 V differential and –0.3 to 26 V common-mode voltage on IN+/IN–, enabling robust operation in hot-swap and high-dV/dt environments.

Key Specifications

Pinout & Package

SOT-23-8 package (1.63 mm × 2.90 mm), thermally enhanced for PCB-mounted current sensing in compact power modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA226AIDGST and MAX4008AUB+T, the INA219AIDCNRG4 uniquely delivers calibrated current, voltage, and power in a single I²C transaction with no host processing-making it optimal for resource-constrained microcontrollers in embedded power management.

Availability

INA219AIDCNRG4 is available at Aetrix Electronics and suitable for server power rail monitoring, telecom rectifier modules, and notebook battery charging paths requiring stable component supply and long-term production continuity.

Supply support for INA219AIDCNRG4 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 company specializing in analog and embedded processing technologies, with leadership in precision signal chain and power management solutions.

The INA219 product line was designed for high-accuracy, digitally interfaced current and power monitoring in space- and cost-sensitive applications such as computing, communications, and industrial power systems.

FAQ

What is the maximum bus voltage the INA219AIDCNRG4 can measure?

The INA219AIDCNRG4 supports a bus voltage input range of 0 to 26 V, referenced to the IN− pin. This allows direct measurement of common DC rails including 12 V, 24 V, and 32 V systems. The absolute maximum rating for common-mode voltage at IN+ and IN− is –0.3 V to 26 V, and differential voltage is limited to ±26 V. Exceeding these limits may cause permanent damage.

Does the INA219AIDCNRG4 require external calibration to report current in amperes?

Yes-the INA219AIDCNRG4 requires programming of the Calibration Register (05h) with a value derived from the shunt resistance (R_SHUNT) and desired current LSB. Without this step, the Current Register (04h) and Power Register (03h) return zero. The device uses this calibration to convert raw shunt voltage counts into amperes and watts internally, eliminating host-side math but requiring one-time setup per design.

Can the INA219AIDCNRG4 operate from a 3.3 V supply while monitoring a 24 V bus?

Yes-the INA219AIDCNRG4 operates from a 3.3 V supply (within its 3–5.5 V range) while measuring bus voltages up to 26 V. Its IN+ and IN− pins are rated for –0.3 V to 26 V common-mode voltage and ±26 V differential, so no level-shifting or isolation is needed. The VS pin powers only the IC's internal circuitry and I²C interface-not the sensed bus.

How does the PGA setting affect the shunt voltage full-scale range in the INA219AIDCNRG4?

The INA219AIDCNRG4's PGA offers four gain options (/1, /2, /4, /8), scaling the shunt voltage full-scale range from ±40 mV (PGA = /8) to ±320 mV (PGA = /1). For example, with a 10 mΩ shunt, PGA = /8 supports up to ±4 A full-scale current, while PGA = /1 supports ±500 mA. The gain is set via bits 11–10 of the Configuration Register (00h) and directly impacts measurement resolution and noise performance.

Is the INA219AIDCNRG4 pin-compatible with other members of the INA219 family?

Yes-the INA219AIDCNRG4 shares identical pinout and footprint with all SOT-23-8 variants of the INA219 family, including INA219BIDCNR and INA219AIDCKR. Differences between grades (A vs B) relate to accuracy specifications (e.g., INA219B offers ±0.2% current error vs ±0.5% for INA219A), not pin function or layout. No PCB redesign is needed when upgrading within the same package variant.