Texas Instruments INA213BIRSWR

Overview

INA213BIRSWR 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 a fixed gain of 50 V/V, ±100 µV maximum offset voltage (RTI), 0.5 µV/°C max offset drift, 80 kHz bandwidth, and operates from 2.7 V to 26 V supply with 100 µA max quiescent current - enabling precise 10-mV full-scale shunt measurements in battery chargers and telecom power management.

For engineers reviewing the INA213BIRSWR datasheet, INA213BIRSWR pinout, INA213BIRSWR application, or INA213BIRSWR equivalent, this page delivers verified specifications, validated SC70/UQFN package mapping, confirmed 10-pin RSW pin functions, real-world use cases in notebook power delivery and USB-C PD systems, and two technically documented alternative parts with quantified gain and error trade-offs.

Technical Context

The INA213BIRSWR implements a zero-drift chopper-stabilized amplifier topology that maintains ±100 µV input offset across –40°C to +125°C, enabling accurate measurement of sub-100-mV shunt drops. Its differential input stage supports common-mode voltages from –0.1 V to 26 V independent of supply voltage, making it suitable for both low-side and high-side configurations in 12-V and 24-V industrial rails.

With a fixed 50 V/V gain and 100-kΩ internal input resistance (R_INT = 20 kΩ), the device achieves 100 dB minimum CMRR and 10 ppm/°C max gain drift. Its output drives loads up to 1 nF capacitance while delivering rail-to-rail swing within 50 mV of V+ and 5 mV of GND at 10-kΩ load - critical for direct interfacing with SAR ADCs in embedded power monitoring.

Key Specifications

Pinout & Package

The INA213BIRSWR 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, the INA213BIRSWR trades tighter offset for superior thermal performance (107 vs 227°C/W) and dual-input pins for lower noise in high-EMI telecom environments; versus INA226AIRSAT, it offers deterministic 125-ns analog response time and zero firmware dependency for safety-critical overcurrent cutoff.

Availability

INA213BIRSWR is available at Aetrix Electronics and suitable for notebook battery protection, USB-C power delivery, telecom DC power shelf monitoring, and industrial 24-V motor drive current feedback requiring stable component supply across multi-year production cycles.

Supply support for INA213BIRSWR 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 engineered specifically for high-accuracy, low-power current sensing in space- and thermal-constrained applications such as portable electronics, telecom infrastructure, and automotive subsystems - emphasizing zero-drift stability and wide common-mode operation.

FAQ

What is the maximum common-mode voltage supported by the INA213BIRSWR?

The INA213BIRSWR 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 the official TI datasheet SBOS437K, enabling direct high-side sensing on 24-V industrial buses without external level-shifting circuitry. The –0.1 V lower limit permits measurement during negative transients in switched systems.

Does the INA213BIRSWR support bidirectional current measurement?

Yes, the INA213BIRSWR supports true bidirectional current sensing. Its output voltage is defined as V_OUT = (I_SHUNT × R_SHUNT) × 50 + V_REF, where polarity of I_SHUNT determines whether V_OUT rises above or falls below V_REF. With V_REF set to mid-supply (e.g., 1.65 V on 3.3 V), the device resolves both charge and discharge currents in battery management systems without hardware reconfiguration.

What is the purpose of the dual IN+ and IN− pins on the INA213BIRSWR RSW package?

The INA213BIRSWR's RSW (10-pin UQFN) package provides two dedicated pins each for IN+ (pins 2 and 3) and IN− (pins 4 and 5) to reduce parasitic inductance and improve high-frequency common-mode rejection. Per TI's datasheet Figure 4-2 and Section 6.3.1, these pins must be tied together externally - not used independently - to maintain matched input paths and preserve the specified 100 dB CMRR performance in noisy switch-mode power supply environments.

Can the INA213BIRSWR operate from a 3.3-V supply while measuring a 24-V rail?

Yes, the INA213BIRSWR can operate from a 3.3-V supply while accurately measuring current on a 24-V rail. Its common-mode input range (–0.1 V to 26 V) is independent of supply voltage, and its zero-drift architecture ensures stable offset performance even with V_S = 3.3 V. The output swings within 50 mV of V+ and 5 mV of GND, allowing direct interface with 3.3-V ADCs without level-shifting.

What is the typical bandwidth and slew rate of the INA213BIRSWR?

The INA213BIRSWR has a typical small-signal bandwidth of 80 kHz (at C_LOAD = 10 pF) and a slew rate of 0.4 V/µs. These values are specified in Section 5.5 of the TI datasheet SBOS437K and enable accurate capture of fast current transients - such as USB-C inrush events or motor startup surges - with less than 10% amplitude attenuation and <12.5 µs rise time for 1-V output steps.