Texas Instruments INA212CIRSWT

Overview

INA212CIRSWT from Texas Instruments is a voltage-output, bidirectional, zero-drift current-shunt monitor optimized for high-side or low-side sensing in power management systems. It features 1000 V/V fixed gain, ±35 µV max offset voltage, 0.5 µV/°C max offset drift, 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 INA212CIRSWT datasheet, INA212CIRSWT pinout, INA212CIRSWT application, or INA212CIRSWT equivalent, this device delivers verified high-accuracy current sensing at extended common-mode voltages (–0.1 V to 26 V), supports SC70 and thin UQFN packages, and integrates reference-input flexibility for differential ADC interfacing without external level-shifting.

Technical Context

The INA212CIRSWT uses a zero-drift chopper-stabilized architecture to achieve ±35 µV max input offset and 0.5 µV/°C max drift over –40°C to +125°C, directly enabling 10-mV full-scale shunt operation. Its 1000 V/V gain and 4 kHz bandwidth support fast transient response in closed-loop current control.

It accepts common-mode inputs from –0.1 V to 26 V independent of supply voltage, with CMRR ≥105 dB and PSRR ≥120 dB, allowing accurate sensing on noisy, high-voltage rails such as 12-V telecom supplies or 24-V industrial buses while powered from a low 2.7-V rail.

Key Specifications

Pinout & Package

INA212CIRSWT 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 supports high-density PCB layouts and offers improved thermal performance (θ_JA = 107.3°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 INA212CIRSWT, INA213AIRSWT trades gain and bandwidth for relaxed offset constraints, while MAX4008AUB+ sacrifices zero-drift precision for wider supply and speed - making INA212CIRSWT optimal for ultra-low-shunt, high-accuracy DC and slow-transient applications.

Availability

INA212CIRSWT is available at Aetrix Electronics and suitable for telecom power supplies, battery charger management, industrial motor control, and optical transceiver power monitoring requiring stable component supply and long-term production continuity.

Supply support for INA212CIRSWT 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 series was designed specifically for high-accuracy, wide common-mode current sensing in power conversion, battery systems, and industrial control - emphasizing zero-drift stability, low quiescent power, and robust ESD performance (±3500-V HBM).

FAQ

What is the maximum common-mode voltage supported by the INA212CIRSWT?

The INA212CIRSWT 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 specifically to Version C devices like INA212CIRSWT and enables direct sensing on 24-V industrial rails or negative-bias circuits without external level-shifting components. The –0.1 V lower limit permits operation slightly below ground in certain fault-tolerant configurations.

Does the INA212CIRSWT require an external reference voltage?

No, the INA212CIRSWT does not require an external reference voltage to function. Its REF pin can be tied to GND for unidirectional sensing or to any voltage between 0 V and V+ to set output common-mode level - including V+/2 for bidirectional operation. When left unconnected, REF defaults to internal bias, but TI recommends explicit connection for predictable output swing and noise immunity. The device itself generates no internal reference; REF is purely an input.

What is the purpose of the two IN+ and two IN− pins on the INA212CIRSWT RSW package?

The INA212CIRSWT's 10-pin thin UQFN (RSW) package provides two dedicated 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 are internally bonded together, so both IN+ pins must be shorted externally with equal-length traces, and both IN− pins likewise - forming a Kelvin connection to the shunt resistor. This layout minimizes layout-induced gain error and preserves the device's specified 105-dB CMRR.

Can the INA212CIRSWT measure bidirectional current, and how is it configured?

Yes, the INA212CIRSWT supports true bidirectional current measurement by setting the REF pin to a mid-supply voltage (e.g., V+/2). When configured this way, OUT = 1000 × (V_IN+ – V_IN−) + V_REF, producing a ratiometric output centered at V+/2 - positive current yields output above V+/2, negative current yields output below. This configuration requires a differential or ratiometric ADC input and is explicitly validated in TI's INA21x datasheet for INA212CIRSWT.

What is the typical output voltage swing for the INA212CIRSWT at 125°C?

At 125°C, the INA212CIRSWT output swings from (V+) – 0.2 V down to GND + 0.05 V under 10-kΩ load conditions, per the datasheet's Electrical Characteristics table. For example, with V+ = 12 V, the guaranteed output range is 0.05 V to 11.8 V. This rail-to-rail capability ensures compatibility with 12-bit ADCs having 0–12 V input ranges, and the 0.05-V headroom above GND avoids clipping near zero-current conditions in high-precision applications.