Texas Instruments INA216A3RSWR

Overview

INA216A3RSWR from Texas Instruments is a unidirectional, high-side current shunt monitor with 100V/V fixed gain, ±20μV max input offset voltage, ±0.2% max gain error, and operation from +1.8V to +5.5V common-mode voltage. It delivers buffered voltage output for direct ADC interfacing in battery-powered power management systems.

For engineers reviewing the INA216A3RSWR datasheet, INA216A3RSWR pinout, INA216A3RSWR application, or INA216A3RSWR equivalent, key selection criteria include its 100V/V gain accuracy at low shunt voltages (≥10mV full-scale), ultra-low quiescent current (13μA), and thermal performance in ThinQFN-10 package for space-constrained portable electronics.

Technical Context

The INA216A3RSWR uses zero-drift auto-zero architecture to maintain ±20μV max offset over –40°C to +125°C, enabling accurate sensing of small differential voltages across shunts. Its common-mode input range (+1.8V to +5.5V) is derived directly from the IN+ pin, eliminating need for separate supply rail.

It features a buffered voltage output stage with 42Ω output impedance, swing to within 100mV of V+ and 1mV of GND, and 5kHz bandwidth (C_L = 10pF). Gain error drift is limited to 0.023 m%/°C, supporting stable performance across industrial temperature extremes.

Key Specifications

Pinout & Package

INA216A3RSWR is packaged in a 10-pin ThinQFN (RSW) with wettable flanks, 2.5mm × 2.5mm footprint, and 0.5mm pitch. Thermal resistance θ_JA = 114.9°C/W supports operation up to 125°C ambient without forced airflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA216A3RSWR, INA210A3IRSWR trades offset performance for wider common-mode capability, while MAX40016ATA+T adds design complexity with external reference dependency-neither offers the same combination of ultra-low offset, single-supply simplicity, and chip-scale integration.

Availability

INA216A3RSWR is available at Aetrix Electronics and suitable for smartphone battery protection, notebook power rail monitoring, USB-C PD charger feedback, and industrial 4–20mA loop diagnostics requiring stable component supply across high-volume production cycles.

Supply support for INA216A3RSWR 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The INA216 series was designed specifically for ultra-low-power, high-accuracy current sensing in space-constrained portable devices-leveraging zero-drift architecture and chip-scale packaging to replace discrete op-amp + reference solutions.

FAQ

What is the maximum common-mode voltage the INA216A3RSWR can tolerate?

The INA216A3RSWR supports a common-mode input range of +1.8V to +5.5V. This range is defined by the voltage applied to the IN+ pin, which also serves as the internal power supply. Exceeding +5.5V risks permanent damage; absolute maximum rating is +7V, but operation above +5.5V requires external transient protection such as dual zener diodes with series resistors as specified in TI's SBOS503C Figure 22.

Does the INA216A3RSWR require an external power supply pin?

No, the INA216A3RSWR does not have a dedicated V_CC or supply pin. It derives power directly from the IN+ pin, which must be held between +1.8V and +5.5V. This architecture eliminates routing complexity but means the device cannot operate below +1.8V common-mode or function as a low-side monitor-its power and signal reference are intrinsically coupled.

What is the output voltage swing capability of the INA216A3RSWR?

The INA216A3RSWR output swings to within 100mV of the positive rail (V_IN+) and to within 1mV of GND under 10kΩ load conditions. This rail-to-rail capability ensures full utilization of 3.3V or 5V ADC input ranges. Output impedance is 42Ω, allowing direct interface to most SAR and delta-sigma ADCs without additional buffering.

Can the INA216A3RSWR be used with a 10mΩ shunt resistor at 10A full-scale current?

Yes. With 10A through a 10mΩ shunt, differential voltage is 100mV. At 100V/V gain, the INA216A3RSWR produces 10V output-but this exceeds its maximum output swing (V_IN+ – 0.1V). For 10A full-scale, use V_IN+ ≥ 10.1V (not supported) or reduce shunt value. A 2mΩ shunt yields 20mV drop → 2V output at 100V/V, staying well within swing limits when V_IN+ = 3.3V or 5V.

How does the zero-drift architecture improve long-term stability in the INA216A3RSWR?

The zero-drift architecture in the INA216A3RSWR continuously corrects input offset voltage using auto-zeroing, limiting drift to 0.03μV/°C typical. This maintains ±20μV max offset across –40°C to +125°C, enabling stable 1000:1 dynamic range without recalibration. Unlike standard amplifiers, it avoids thermal hysteresis and time-dependent drift, critical for battery fuel gauging and industrial metering where baseline accuracy degrades over time.