Texas Instruments INA213CIRSWR

Overview

INA213CIRSWR 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 common-mode. It features a fixed gain of 50 V/V, ±100 µV maximum input offset voltage (RTI), 0.5 µV/°C max offset drift, 10 ppm/°C max gain drift, and operates from 2.7 V to 26 V supply with ≤100 µA quiescent current. It is used in precision battery charging and telecom power management where 10-mV full-scale shunt drops are required.

For engineers reviewing the INA213CIRSWR datasheet, INA213CIRSWR pinout, INA213CIRSWR application, or INA213CIRSWR equivalent, this page delivers verified electrical specifications, SC70/UQFN package mapping, functional pin roles, real-world use cases in power delivery systems, and two validated alternative parts with documented technical and application differences.

Technical Context

The INA213CIRSWR implements a zero-drift chopper-stabilized amplifier topology enabling stable DC accuracy 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, allowing direct sensing on high-voltage rails while powered from low-voltage logic supplies.

It delivers 80 kHz small-signal bandwidth and 0.4 V/µs slew rate with 25 nV/√Hz input-referred voltage noise. The REF pin accepts 0 V to V+ reference voltage, enabling offset-adjusted output scaling - critical for ADC interfacing in closed-loop current control circuits.

Key Specifications

Pinout & Package

INA213CIRSWR is available in the RSW (10-pin Thin UQFN) package, measuring 1.80 mm × 1.40 mm with 0.5-mm pitch. This thermally enhanced, space-constrained package supports high-density PCB layouts and provides improved thermal resistance (R_θJB = 18.7 °C/W) versus SC70.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA213CIRSWR, INA213AIDCKR offers identical electrical performance in a thermally inferior SC70 package, while MAX40056ASA+T trades wide common-mode and REF flexibility for lower offset in narrow-supply applications - making the RSW-packaged INA213CIRSWR optimal for 12–24 V industrial and telecom current monitoring.

Availability

INA213CIRSWR is available at Aetrix Electronics and suitable for telecom power supplies, battery charger feedback loops, and industrial PLC analog input modules requiring stable component supply with guaranteed long-term manufacturability.

Supply support for INA213CIRSWR 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 specializing in analog and embedded processing technologies, with leadership in precision signal chain and power management solutions.

The INA21x product line was engineered for high-accuracy, low-power current sensing in space- and thermal-constrained applications - targeting server VRMs, battery management, and industrial power conversion where shunt-based measurement replaces costly isolation.

FAQ

What is the maximum common-mode voltage supported by the INA213CIRSWR?

The INA213CIRSWR 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 specifically to Version C devices like the INA213CIRSWR and enables direct high-side sensing on 24-V industrial buses or 12-V automotive rails without external level-shifting circuitry. The device maintains specified accuracy within this range independent of its 2.7–26 V supply voltage.

Does the INA213CIRSWR require an external reference voltage?

No, the INA213CIRSWR does not require an external reference voltage - the REF pin can be tied to GND, V+, or any voltage between them to set output offset. When left unconnected, REF defaults to GND internally, yielding V_OUT = 50×(V_IN+ – V_IN−). For ratiometric ADC interfacing, connecting REF to a precision voltage divider improves measurement accuracy by eliminating supply-voltage dependence in the output equation.

Can the INA213CIRSWR measure bidirectional current with a single shunt resistor?

Yes, the INA213CIRSWR measures bidirectional current using a single shunt resistor by interpreting polarity of the differential input voltage (V_IN+ – V_IN−). With REF set to mid-supply (e.g., 1.65 V on 3.3 V), positive current yields output above REF and negative current yields output below REF. Its zero-drift architecture ensures symmetric accuracy for both directions - critical for battery charge/discharge monitoring in the INA213CIRSWR.

What is the purpose of the dual IN+ and IN− pins on the RSW package of the INA213CIRSWR?

The RSW package provides two IN+ pins (2 and 3) and two IN− pins (4 and 5) to reduce parasitic impedance and improve high-frequency matching between inputs. These pins must be externally tied together to ensure equal trace lengths and minimize imbalance-induced CMRR degradation. This layout practice preserves the INA213CIRSWR's specified 100 dB minimum CMRR and prevents gain errors caused by unequal series resistance in PCB routing.

How does the gain error specification of ±0.5% for the INA213CIRSWR relate to actual current measurement accuracy?

The ±0.5% gain error (Version C) is the maximum deviation in amplification factor over –40°C to +125°C and defines worst-case scaling uncertainty in the output equation V_OUT = 50×(V_IN+ – V_IN−) + V_REF. Combined with ±100 µV offset and 0.5 µV/°C drift, it contributes directly to total unadjusted error - e.g., at 100-mV shunt drop, ±0.5% gain error equals ±0.5 mA absolute current error for a 1-A full-scale system using the INA213CIRSWR.