Texas Instruments INA212CIRSWR

Overview

INA212CIRSWR 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 1000 V/V, ±35 µV maximum offset voltage (over temperature), 0.5 µV/°C max offset drift, ±0.5% max gain error (Version C), and operates from 2.7 V to 26 V supply with only 100 µA quiescent current. It enables precise 10-mV full-scale shunt measurements in battery chargers and telecom power management systems.

For engineers reviewing the INA212CIRSWR datasheet, INA212CIRSWR pinout, INA212CIRSWR application, or INA212CIRSWR equivalent, this page delivers verified technical context, package-specific pin functions, real-world design implications of its 1000 V/V gain and –0.1 V to 26 V common-mode range, and validated alternative options for current-sense amplifier selection.

Technical Context

The INA212CIRSWR implements a zero-drift chopper-stabilized amplifier topology to achieve ±35 µV max input offset and 0.5 µV/°C max drift over –40°C to +125°C, enabling accurate low-voltage shunt sensing. Its differential input stage supports common-mode voltages from –0.1 V to 26 V independent of supply voltage, with 105 dB min CMRR and 10 ppm/°C max gain drift.

This device uses a fixed-gain, single-supply configuration with internal precision resistors (R3 = 1 kΩ, R4 = 1 kΩ) defining its 1000 V/V transfer function. The output swings within 50 mV of V+ and 5 mV of GND under 10-kΩ load, and exhibits 4 kHz bandwidth with 0.4 V/µs slew rate and 25 nV/√Hz input-referred voltage noise.

Key Specifications

Pinout & Package

INA212CIRSWR is packaged in a 10-pin Thin UQFN (RSW) with 1.80 mm × 1.40 mm body size and wettable flank terminations for automated optical inspection. Pin functions are validated per TI SBOS437K Rev. K (November 2023).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA212CIRSWR, INA213AIRSWR trades gain and offset precision for extended current range, while INA226AIRSWR replaces analog output with I²C digital interface and adds on-chip ADC and temperature sensing-enabling smarter, software-configurable current monitoring without external signal conditioning.

Availability

INA212CIRSWR is available at Aetrix Electronics and suitable for battery management systems, telecom power supplies, laptop power delivery, and industrial motor drives requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for INA212CIRSWR 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 analog signal chains and power management ICs.

The INA21x family was designed specifically for high-accuracy, low-power current sensing in space-constrained, thermally demanding applications such as portable electronics, telecom infrastructure, and industrial power systems.

FAQ

What is the maximum common-mode voltage supported by the INA212CIRSWR?

The INA212CIRSWR supports a common-mode input voltage range of –0.1 V to 26 V over its full operating temperature range (–40°C to +125°C). This specification applies to Version C devices and enables reliable high-side sensing on 24-V industrial rails while tolerating negative transients during hot-plug events. The –0.1 V lower limit permits measurement near ground potential in low-side configurations without input phase reversal.

Does the INA212CIRSWR require an external reference voltage?

No, the INA212CIRSWR does not require an external reference voltage to operate, but the REF pin must be actively driven to a defined voltage between 0 V and V+. If unused, it should be tied to GND or V+/2 to set output mid-rail. Leaving REF floating causes undefined output behavior. For ratiometric accuracy against system ADC references, TI recommends buffering REF with an op amp when sourced from a resistor divider.

Can the INA212CIRSWR measure bidirectional current?

Yes, the INA212CIRSWR supports true bidirectional current measurement. When the REF pin is set to mid-supply (e.g., V+/2), the output voltage centers at that level: positive load current increases V_OUT above REF, and negative (reverse) current decreases it below REF. This enables single-supply microcontrollers to detect charge/discharge direction in battery applications without polarity-switching circuitry.

What is the purpose of the NC pins on the INA212CIRSWR RSW package?

The two NC pins (pins 1 and 7) on the INA212CIRSWR's 10-pin Thin UQFN package have no internal connection and serve no electrical function. They may be left floating or connected to GND for mechanical stability or thermal relief, but TI documentation confirms no performance benefit or thermal path exists through these pins. Routing traces or vias to them is unnecessary and may compromise solder joint reliability.

How does the INA212CIRSWR's 1000 V/V gain impact shunt resistor selection?

The INA212CIRSWR's 1000 V/V gain allows use of very small shunt resistors-e.g., a 10-mΩ shunt produces 10 mV drop at 1 A, which scales to 10 V output-maximizing ADC resolution while minimizing I²R loss. However, gain also magnifies errors: a 35-µV offset appears as 35-mV output error, equivalent to 3.5-A error on that 10-mΩ shunt. Therefore, optimal shunt value balances power dissipation, noise immunity, and offset-induced inaccuracy for the target current range.