Texas Instruments INA219AIDCNT

Overview

INA219AIDCNT from Texas Instruments is a zero-drift, bidirectional current/power monitor IC with I²C/SMBus interface, sensing bus voltages from 0 to 26 V and shunt drops up to ±320 mV (PGA = /8), delivering 12-bit ADC resolution, ±0.5% current measurement error over temperature, and 1 mA quiescent supply current - deployed in server power rails and telecom equipment for real-time energy telemetry.

For engineers reviewing the INA219AIDCNT datasheet, INA219AIDCNT pinout, INA219AIDCNT application, or INA219AIDCNT equivalent, this page delivers verified pin functions, calibrated accuracy specs across temperature, I²C timing compliance (up to 400 kHz), SOT-23-8 package thermal metrics, and validated alternatives for precision DC power monitoring in industrial and embedded systems.

Technical Context

The INA219AIDCNT integrates a delta-sigma ADC with programmable gain amplifier (PGA) supporting /1, /2, /4, and /8 settings to scale shunt voltage input range from ±40 mV to ±320 mV, while independently configuring bus voltage full-scale ranges of 16 V or 32 V via BRNG bit. Its internal multiplier and calibration register enable direct current (amperes) and power (watts) computation without host-side math.

It operates in continuous or triggered conversion modes, supports 16 I²C addresses via A0/A1 pins, and features Power-Down mode (6–15 μA) with 40 μs wake-up. Input protection tolerates –0.3 V to 26 V common-mode and ±26 V differential, with ESD ratings of ±4 kV HBM and ±750 V CDM.

Key Specifications

Pinout & Package

SOT-23-8 package (1.63 mm × 2.90 mm), thermally optimized for PCB space-constrained DC power monitoring nodes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA219AIDCNT, INA226AIRSAT offers superior resolution and drift performance at higher power and larger footprint, while MAX4008AASA+ trades programmability and power math for lower cost and simpler integration - making INA219AIDCNT the balanced choice for compact, feature-rich DC power telemetry.

Availability

INA219AIDCNT is available at Aetrix Electronics and suitable for server power rail monitoring, telecom rectifier telemetry, and notebook battery charge management requiring stable component supply and long-term production continuity.

Supply support for INA219AIDCNT 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 conditioning and power management ICs.

The INA219 product line was designed specifically for high-accuracy, I²C-enabled DC current and power monitoring in space-constrained, thermally demanding applications such as servers, telecom infrastructure, and portable electronics.

FAQ

What is the maximum bus voltage the INA219AIDCNT can measure?

The INA219AIDCNT supports a bus voltage measurement range of 0 to 26 V, with absolute maximum ratings limiting common-mode voltage to –0.3 V to 26 V and differential voltage to ±26 V. This allows direct connection to 12 V, 24 V, and 48 V telecom rails without external level-shifting circuitry. The device uses the IN– pin as the bus voltage reference point, measuring V_IN– to GND - a key design feature confirmed in TI SBOS448G Section 6 and Figure 13.

Does the INA219AIDCNT require programming before delivering current readings?

Yes, the INA219AIDCNT requires initial programming of the Calibration Register (05h) to report meaningful current (amperes) and power (watts) values. Without calibration, the Current Register (04h) and Power Register (03h) return zero. Calibration depends on the shunt resistance (R_SHUNT) and desired Current_LSB, as defined in Equation 1 of TI SBOS448G Section 8.5.1. Default settings yield raw shunt voltage (10 μV/LSB) and bus voltage (4 mV/LSB) only.

What is the operating temperature range for the INA219AIDCNT?

The INA219AIDCNT is specified to operate from –40°C to +125°C junction temperature, with recommended ambient conditions of –25°C to +85°C per Section 7.3 of TI SBOS448G. Its zero-drift architecture ensures offset drift below 0.1 μV/°C, and current measurement error remains within ±0.5% across the full –25°C to +85°C range - validated in Figures 3 and 4 of the datasheet.

Can the INA219AIDCNT be used with high-side shunt configurations?

Yes, the INA219AIDCNT supports high-side shunt placement due to its 26 V common-mode input range and ability to tolerate –0.3 V to 26 V at both IN+ and IN– pins. It is explicitly designed for compatibility with TI hot-swap controllers like the TPS2490, which use high-side shunts. When paired with a 50 mV full-scale shunt, the PGA can be set to /2 to achieve an 80 mV range - matching the TPS2490's sense threshold as documented in SBOS448G Section 8.3.1.3.

How does the PGA setting affect the shunt voltage full-scale range of the INA219AIDCNT?

The PGA setting directly scales the shunt voltage full-scale range: /1 = ±40 mV, /2 = ±80 mV, /4 = ±160 mV, and /8 = ±320 mV. This allows optimization for different shunt resistor values and expected load currents - for example, a 10 mΩ shunt carrying 32 A yields 320 mV drop, requiring PGA = /8. All PGA settings maintain the same 12-bit ADC resolution and ±0.5% accuracy, as confirmed in Table 1 of TI SBOS448G Section 7.5.