Texas Instruments INA216A2RSWT

Overview

INA216A2RSWT from Texas Instruments is a unidirectional, high-side current shunt monitor IC with fixed 50V/V gain, ±20μV max input offset voltage, 13μA quiescent current, and operation from +1.8V to +5.5V common-mode input range. It enables precision low-voltage drop current sensing in battery-powered power management systems.

For engineers reviewing the INA216A2RSWT datasheet, INA216A2RSWT pinout, INA216A2RSWT application, or INA216A2RSWT equivalent, key selection criteria include its 50V/V gain accuracy, zero-drift architecture for sub-10mV full-scale sensing, chip-scale package thermal performance, and compatibility with high-common-mode industrial bus monitoring.

Technical Context

The INA216A2RSWT uses auto-zeroing zero-drift amplifier architecture to achieve ±20μV max input offset voltage and 0.05μV/°C drift, enabling stable 10mV full-scale shunt voltage measurement across –40°C to +125°C. Its common-mode rejection ratio (CMRR) reaches 108dB, matching its power-supply rejection ratio (PSRR), due to shared V_CM and supply reference at the IN+ pin.

This device draws only 13μA quiescent current and delivers buffered voltage output without external op-amp buffering. Its 10kHz small-signal bandwidth and 0.03V/μs slew rate support dynamic load current monitoring in real-time power telemetry applications.

Key Specifications

Pinout & Package

INA216A2RSWT is housed in a 10-pin ThinQFN (RSW) package with wettable flanks, measuring 2.0mm × 2.0mm × 0.4mm, optimized for automated optical inspection and thermal dissipation (θ_JA = 114.9°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA216A2RSWT, INA210A2IDCKR trades ultra-low IQ and zero-drift stability for larger package and higher offset, while MAX4005EUT+T offers broader supply range but sacrifices precision at low currents due to higher offset and absence of auto-zeroing.

Availability

INA216A2RSWT is available at Aetrix Electronics and suitable for battery fuel gauging, USB-C power delivery monitoring, and telecom DC-DC module telemetry requiring stable component supply across extended temperature and long product lifecycles.

Supply support for INA216A2RSWT 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, embedded processing, and high-reliability silicon solutions for industrial, automotive, and communications markets.

The INA216 series was designed specifically for unidirectional, high-side current sensing in space-constrained, low-power systems-emphasizing zero-drift precision, minimal supply current, and direct integration with microcontroller ADCs.

FAQ

What is the maximum common-mode voltage the INA216A2RSWT can tolerate?

The INA216A2RSWT supports a common-mode input range of +1.8V to +5.5V. Its absolute maximum rating is +7V on the IN+ pin, but operation above +5.5V violates specification limits and risks parametric shift or damage. For transient overvoltage protection beyond 5.5V, external zener diodes with series resistors (e.g., 10Ω) are required per TI application guidance. The INA216A2RSWT itself does not include internal overvoltage clamping.

Does the INA216A2RSWT require an external power supply pin?

No, the INA216A2RSWT has no dedicated V_CC pin. It derives power internally from the IN+ pin, which serves simultaneously as the noninverting input and supply node. This architecture eliminates the need for a separate bias rail but binds the supply voltage to the common-mode voltage level. As a result, the device cannot operate below +1.8V common-mode, and the IN+ pin must remain within the +1.8V to +5.5V operating range for guaranteed functionality. The INA216A2RSWT remains fully functional under this constraint.

What is the typical output swing capability of the INA216A2RSWT?

The INA216A2RSWT provides rail-to-rail output swing: it drives as low as (GND + 0.001V) and as high as (V_IN+ – 0.1V) under 10kΩ load conditions. This buffered output eliminates the need for external op-amp followers in most microcontroller ADC interfacing scenarios. The 42Ω output impedance ensures stable driving of moderate capacitive loads up to 750pF. These characteristics are confirmed in the INA216A2RSWT Electrical Characteristics table and Figure 9 of the SBOS503C datasheet.

How does the zero-drift architecture improve low-current measurement accuracy in the INA216A2RSWT?

The zero-drift architecture in the INA216A2RSWT actively cancels input offset voltage and its drift over time and temperature, achieving ±20μV max offset and 0.05μV/°C drift. This enables accurate measurement of shunt voltages as low as 10mV full-scale-critical for detecting sub-mA currents with 2mΩ shunts. Without zero-drift, conventional amplifiers would introduce >1% error at such levels. The INA216A2RSWT's architecture sustains this accuracy across –40°C to +125°C, making it suitable for battery and industrial applications where thermal stability is essential.

Is the INA216A2RSWT pin-compatible with other variants in the INA216 family?

Yes, all INA216 variants-including INA216A1, A2, A3, and A4-in the same RSW (ThinQFN-10) package share identical pinout and footprint. The INA216A2RSWT uses pins IN+, IN−, OUT, and GND identically across gain versions; only the internal gain-setting resistors differ. This allows design reuse and gain optimization without PCB revision. However, bandwidth and noise performance vary by gain (e.g., INA216A2RSWT = 10kHz, INA216A4RSWT = 2.5kHz), so system-level validation is required when swapping variants.