Texas Instruments INA213AIRSWR

Overview

INA213AIRSWR from Texas Instruments is a voltage-output, zero-drift current-shunt monitor optimized for bidirectional low- or high-side sensing in power management systems. It features 50 V/V fixed gain, ±100 µV max input offset voltage (RTI), 100 dB min CMRR, 80 kHz bandwidth, and operates from 2.7 V to 26 V supply across –40°C to +125°C - enabling precise 10-mV full-scale shunt measurements in battery chargers and telecom power rails.

For engineers reviewing the INA213AIRSWR datasheet, INA213AIRSWR pinout, INA213AIRSWR application, or INA213AIRSWR equivalent, this page delivers verified specifications, validated SC70/UQFN package mapping, confirmed 10-pin RSW pin functions, real-world use cases in notebook power monitoring and USB-C PD systems, and two technically documented alternative parts with explicit gain and drift differences.

Technical Context

The INA213AIRSWR implements a zero-drift chopper-stabilized amplifier architecture with matched internal resistor networks (R_INT = 20 kΩ) to achieve ±100 µV max RTI offset and 0.5 µV/°C max offset drift over –40°C to +125°C. Its differential input stage supports common-mode voltages from –0.1 V to 26 V independent of supply voltage, enabling direct sensing on 12-V or 24-V rails while powered from 3.3-V or 5-V logic supplies.

It uses a single-ended voltage output referenced to the REF pin, with rail-to-rail swing capability (within 50 mV of V+ and 5 mV of GND at 10-kΩ load), 25 nV/√Hz input-referred noise, and 10 ppm/°C max gain drift - all specified under continuous operation without shutdown control, as the device lacks an enable pin.

Key Specifications

Pinout & Package

The INA213AIRSWR is packaged in a 10-pin Thin UQFN (RSW) with 1.80 mm × 1.40 mm body size and 0.5-mm pitch. Thermal resistance is 107.3°C/W (Junction-to-Ambient) and 18.7°C/W (Junction-to-Board), supporting compact PCB layouts with minimal heatsinking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA213AIDCKR and INA226AIDSQR, the INA213AIRSWR uniquely balances ultra-low thermal resistance, analog immediacy, and sub-100-µV offset stability - making it optimal for high-density, thermally constrained, analog-closed-loop power systems where latency and calibration overhead must be minimized.

Availability

INA213AIRSWR is available at Aetrix Electronics and suitable for server power supply monitoring, USB-C power delivery controller design, notebook battery charge management, and industrial 24-V motor drive protection requiring stable component supply across extended temperature and long production lifecycles.

Supply support for INA213AIRSWR 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 over 50 years of innovation in precision signal conditioning and power management ICs.

The INA21x product line was designed specifically for high-accuracy, wide common-mode current sensing in energy-efficient computing, telecom infrastructure, and industrial power systems - emphasizing zero-drift stability, rail-to-rail operation, and robust thermal packaging.

FAQ

What is the maximum common-mode voltage the INA213AIRSWR can measure?

The INA213AIRSWR supports a common-mode input voltage range of –0.1 V to 26 V across its full operating temperature range (–40°C to +125°C). This specification applies to Versions B and C per TI SBOS437K; the device maintains accuracy without external level-shifting circuitry, enabling direct high-side sensing on 24-V industrial buses or negative-grounded low-side configurations. The –0.1 V lower limit permits measurement near ground potential in bidirectional applications.

Does the INA213AIRSWR have a shutdown or enable pin?

No, the INA213AIRSWR does not include a dedicated shutdown or enable pin. Power control must be implemented externally - for example, by switching the V+ supply using a MOSFET or logic gate. In shutdown mode, the device exhibits ~1-MΩ paths from IN+ and IN− to REF and OUT, resulting in leakage currents proportional to common-mode voltage; these are typically <25 µA at 12-V V_CM. Full functionality resumes immediately upon V+ restoration.

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

The INA213AIRSWR's 10-pin RSW package provides two IN+ pins (pins 2 and 3) and two IN− pins (pins 4 and 5) to reduce parasitic inductance and improve high-frequency common-mode rejection. These pins must be shorted together on the PCB using minimum-length traces or copper pours. This layout practice minimizes imbalance between input paths, preserving the 100 dB minimum CMRR and ensuring stable 80 kHz bandwidth performance in noisy switch-mode environments.

Can the REF pin be left unconnected or tied to V+?

No - the REF pin must be actively driven to a defined voltage between 0 V and V+. Leaving it floating causes undefined output behavior and violates absolute maximum ratings. Tying REF to V+ is electrically permissible but reduces usable output swing to GND–(V+–0.05 V), limiting dynamic range. For optimal performance, tie REF to a stable reference (e.g., 1.25 V bandgap or mid-rail divider) or to GND for unipolar output centered at 0 V. External impedance >10 Ω degrades CMRR.

How does the INA213AIRSWR's 50 V/V gain compare to other INA21x variants?

The INA213AIRSWR's 50 V/V gain is the lowest in the INA21x family, optimized for larger shunt voltage drops (e.g., 60-mV full-scale at 3.3-V supply) while maintaining 10-mV resolution capability. This contrasts with INA210 (200 V/V), INA211 (500 V/V), and INA212 (1000 V/V), which target ultra-low shunt losses. The 50 V/V gain provides superior signal-to-noise ratio for moderate-current applications and relaxes PCB layout constraints versus higher-gain variants that demand tighter input routing.