Texas Instruments INA214AIRSWT

Overview

INA214AIRSWT from Texas Instruments is a voltage-output, bidirectional current-shunt monitor with zero-drift architecture, designed for high-accuracy low- or high-side current sensing in power rails up to 26 V. It features 100 V/V fixed gain, ±60 µV maximum input offset voltage (RTI), 0.5 µV/°C max offset drift, 30 kHz bandwidth, and operates from 2.7 V to 26 V supply with ≤100 µA quiescent current. It enables precise 10-mV full-scale shunt measurements in battery chargers and telecom power management.

For engineers reviewing the INA214AIRSWT datasheet, INA214AIRSWT pinout, INA214AIRSWT application, or INA214AIRSWT equivalent, this page delivers verified technical context, package-specific pin functions, real-world use cases, and validated alternative options - all grounded in TI's SBOS437K production data sheet and RSW-package characterization.

Technical Context

The INA214AIRSWT implements a zero-drift chopper-stabilized amplifier topology to achieve ultra-low offset and drift, enabling accurate measurement of small differential voltages across shunts at common-mode voltages from –0.1 V to 26 V. Its internal matched resistor network (R_INT = 10 kΩ) sets the 100 V/V gain without external components.

It supports both unidirectional and bidirectional current sensing via configurable REF pin biasing, and its rail-to-rail output swings within 50 mV of V+ and 5 mV of GND under 10-kΩ load. The device is specified across –40°C to +125°C and exhibits 105 dB minimum CMRR and 25 nV/√Hz input-referred voltage noise density.

Key Specifications

Pinout & Package

INA214AIRSWT is packaged in a 10-pin Thin UQFN (RSW) with 1.80 mm × 1.40 mm body size and 0.5-mm pitch. The package includes dual IN+ and dual IN– pins for improved layout symmetry and reduced parasitic impedance mismatch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-sense amplifier applications.

Compared with INA214AIDCKR, the INA214AIRSWT offers superior thermal performance and layout robustness via dual-input pins; compared with INA226AIDGST, it delivers lower latency, deterministic analog output, and better DC precision for closed-loop analog control.

Availability

INA214AIRSWT is available at Aetrix Electronics and suitable for power management systems, telecom DC distribution, battery charging circuits, and industrial motor drive feedback requiring stable component supply and guaranteed long-term sourcing.

Supply support for INA214AIRSWT 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 INA21x family was engineered specifically for high-accuracy, low-drift current sensing in space- and power-constrained applications - targeting battery, telecom, computing, and industrial power systems demanding <100-µV offset stability.

FAQ

What is the maximum common-mode voltage supported by the INA214AIRSWT?

The INA214AIRSWT supports a common-mode input voltage range of –0.1 V to 26 V across the full operating temperature range (–40°C to +125°C). This specification applies to Versions B and C per TI SBOS437K; the –0.1 V lower limit enables reliable low-side sensing even with small negative transients, while the 26 V upper limit supports direct monitoring of 24-V industrial and telecom power rails. The INA214AIRSWT maintains specified accuracy throughout this range without external level-shifting circuitry.

Does the INA214AIRSWT support bidirectional current sensing?

Yes, the INA214AIRSWT supports bidirectional current sensing through configuration of the REF pin. When REF is tied to GND, the output voltage scales linearly with current direction: positive current yields positive V_OUT, negative current yields negative V_OUT (within output swing limits). When REF is biased to mid-supply (e.g., V_S/2), the output centers at that voltage and swings above/below it based on current polarity. This flexibility makes the INA214AIRSWT suitable for battery charge/discharge monitoring and H-bridge current feedback.

What is the purpose of the dual IN+ and IN– pins on the INA214AIRSWT RSW package?

The dual IN+ (Pins 2 & 3) and dual IN– (Pins 4 & 5) terminals on the INA214AIRSWT are electrically connected internally and must be tied together externally. Their purpose is to reduce parasitic impedance imbalance between the two input paths, improving common-mode rejection and minimizing layout-induced gain errors. This design enhances measurement accuracy in high-noise environments and supports symmetric PCB routing - a key advantage over the single-pin SC70 variant (INA214AIDCKR).

Can the INA214AIRSWT operate from a 3.3-V supply while measuring a 24-V rail?

Yes, the INA214AIRSWT can operate from a 3.3-V supply while accurately measuring current on a 24-V rail. Its wide 2.7-V to 26-V supply range and –0.1 V to 26 V common-mode input range are independent specifications. As long as V+ = 3.3 V and the shunt is placed on the 24-V rail (high-side or low-side), the device functions correctly - delivering a scaled analog output referenced to its own supply. No level-shifting or isolation is required, simplifying system architecture.

What is the typical output voltage swing limitation of the INA214AIRSWT?

The INA214AIRSWT output swings to within 50 mV of V+ and 5 mV of GND when driving a 10-kΩ load, per TI SBOS437K Electrical Characteristics. For example, with V+ = 5 V, the usable output range is approximately 0.005 V to 4.95 V. This rail-to-rail capability ensures maximum dynamic range for ADC interfacing. Loading below 10 kΩ degrades swing margin; for heavier loads, buffer amplification or reduced gain staging is recommended to preserve linearity.