Texas Instruments INA216A1RSWR

Overview

INA216A1RSWR from Texas Instruments is a unidirectional, high-side current shunt monitor IC with fixed 25V/V gain, ±30μV max input offset voltage, 20kHz bandwidth, and operation from +1.8V to +5.5V supply. It senses shunt voltage drops as low as 10mV full-scale in power management circuits for notebook computers and battery chargers.

For engineers reviewing the INA216A1RSWR datasheet, INA216A1RSWR pinout, INA216A1RSWR application, or INA216A1RSWR equivalent, key selection criteria include common-mode range (+1.8V to +5.5V), quiescent current (13μA), gain error (±0.2% max), and thermal performance in ThinQFN-10 package.

Technical Context

The INA216A1RSWR uses zero-drift auto-zero architecture to achieve ±30μV max input offset voltage and 0.06μV/°C drift, enabling accurate low-voltage shunt sensing down to 10mV full-scale. Its buffered voltage output eliminates need for external op-amp buffering.

It operates without dedicated V_CC pin-power is derived from IN+-so minimum common-mode voltage is constrained to +1.8V. The device supports unidirectional current measurement only and features 90dB CMRR and PSRR over its full common-mode range.

Key Specifications

Pinout & Package

INA216A1RSWR is packaged in a 10-pin UQFN (ThinQFN-10) package with wettable flanks, 2.0mm × 2.0mm footprint, 0.5mm pitch, and exposed thermal pad. This package supports automated optical inspection (AOI) and provides low θ_JA = 114.9°C/W for thermally constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA216A1RSWR, INA210A1IDCKR extends common-mode range to 26V but sacrifices thermal stability, while MAX4080TASA+ trades gain accuracy and offset for ultra-high voltage operation-neither is pin-compatible, requiring layout revision and recalibration.

Availability

INA216A1RSWR is available at Aetrix Electronics and suitable for notebook computer power management, battery charging control, and telecom equipment power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for INA216A1RSWR 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 INA216 product line delivers ultra-low-offset, low-power current sensing for space-constrained, battery-sensitive applications-designed specifically for high-side monitoring in 1.8V–5.5V systems where accuracy, size, and quiescent current are critical.

FAQ

What is the maximum common-mode voltage supported by the INA216A1RSWR?

The INA216A1RSWR supports a common-mode input voltage range of +1.8V to +5.5V. This is defined by its internal power architecture-since it draws supply from the IN+ pin, voltages below +1.8V cannot sustain proper operation. Exceeding +5.5V risks damage; absolute maximum rating is +7V, but operation above +5.5V is not functional or guaranteed. The INA216A1RSWR is therefore optimized for low-voltage, high-side sensing in modern portable and embedded systems.

Does the INA216A1RSWR require an external power supply pin?

No, the INA216A1RSWR does not have a dedicated V_CC or supply pin. It derives operating power directly from the IN+ input pin, which serves as both the noninverting input and the internal power rail. This architecture eliminates the need for a separate supply connection but constrains the minimum common-mode voltage to +1.8V. As a result, the INA216A1RSWR cannot be used in low-side configurations or applications requiring common-mode voltages below +1.8V.

What is the purpose of the NC pins on the INA216A1RSWR ThinQFN-10 package?

The INA216A1RSWR ThinQFN-10 package includes six NC (no-connect) pins-pins 3 and 5 through 10-each corresponding to an unused bump pad with no internal silicon connection. These pins are electrically isolated and require no routing, grounding, or thermal ties. They may be left floating or connected to GND for mechanical stability, but doing so provides no electrical benefit. Their presence reflects package reuse across the INA216 family and simplifies die assembly, not functionality.

Can the INA216A1RSWR accurately measure bidirectional current flow?

No, the INA216A1RSWR is strictly a unidirectional current shunt monitor. Its architecture and specification-such as single-supply operation, rail-referenced output swing, and absence of bipolar offset trimming-support current flow in one direction only (from IN+ to IN−). Attempting to measure reverse current results in output saturation near GND and invalid readings. For bidirectional sensing, TI recommends the INA226 or INA240 families, which feature true zero-center output and symmetric offset specifications.

How does the zero-drift architecture of the INA216A1RSWR improve measurement accuracy?

The zero-drift (auto-zero) architecture of the INA216A1RSWR actively cancels input offset voltage and its drift over time and temperature. This achieves ±30μV max offset and ≤0.06μV/°C drift-enabling accurate measurement of shunt voltages as low as 10mV full-scale with ≤0.3% error. Unlike conventional amplifiers, this architecture maintains stability across –40°C to +125°C without external calibration, making the INA216A1RSWR ideal for applications demanding long-term accuracy in thermally variable environments.