Texas Instruments INA214CIRSWT

Overview

INA214CIRSWT 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 100 V/V fixed gain, ±60 µV maximum input offset voltage (RTI), 0.5 µV/°C max offset drift, ±0.5% max gain error over temperature, and operates from 2.7 V to 26 V supply with 100 µA max quiescent current. It enables precise 10-mV full-scale shunt measurements in battery chargers and telecom power management systems.

For engineers reviewing the INA214CIRSWT datasheet, INA214CIRSWT pinout, INA214CIRSWT application, or INA214CIRSWT equivalent, this page delivers verified specifications, validated SC70/UQFN package mapping, confirmed 10-pin RSW pin functions, real-world use cases in power delivery and embedded monitoring, and two technically documented alternative parts with explicit functional and application-level differences.

Technical Context

The INA214CIRSWT implements a precision zero-drift chopper-stabilized amplifier topology optimized for differential current-sense signal conditioning across shunt resistors. Its input stage rejects common-mode voltages from –0.1 V to 26 V independent of supply, enabling direct measurement on high-voltage rails while powered from low-voltage logic supplies.

It uses internal matched thin-film resistors (R_INT = 10 kΩ) to set its 100 V/V gain and achieves 105 dB minimum CMRR and 25 nV/√Hz input-referred voltage noise. The device supports REF-biased output configuration and includes built-in ESD protection rated at ±3500 V HBM for Versions B/C - matching INA214CIRSWT's specified version grade.

Key Specifications

Pinout & Package

The INA214CIRSWT is packaged in a 10-pin Thin UQFN (RSW) with 1.80 mm × 1.40 mm body size and 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 INA214AIDCKR and MAX40056ATA+T, the INA214CIRSWT uniquely combines ±0.5% gain accuracy, –0.1-V to 26-V common-mode operation, and REF-biased analog output - making it the only option among the three qualified for high-precision, wide-rail, analog-feedback current sensing in industrial and telecom power systems.

Availability

INA214CIRSWT is available at Aetrix Electronics and suitable for battery management systems, telecom power supplies, USB-C PD chargers, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for INA214CIRSWT 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 ICs.

The INA21x product line was engineered for high-accuracy, low-power current sensing in space-constrained, thermally demanding applications - particularly in battery-powered, telecom, and industrial power systems where shunt-based measurement must coexist with wide common-mode voltage ranges and extended temperature operation.

FAQ

What is the maximum common-mode voltage the INA214CIRSWT can measure?

The INA214CIRSWT supports a common-mode input voltage range of –0.1 V to 26 V across its IN+ and IN– pins. This specification applies under recommended operating conditions and enables reliable high-side sensing on 24-V industrial rails or low-side sensing with minor negative transients. The –0.1 V lower limit reflects its Version C rating per TI SBOS437K Rev. November 2023.

Does the INA214CIRSWT require an external reference voltage?

No - the INA214CIRSWT does not require an external reference voltage to operate. Its REF pin is optional and used only to set the output common-mode level; if left unconnected or tied to GND, the output centers at ~0 V. When interfacing with single-ended ADCs, connecting REF to V+/2 provides rail-to-rail output swing. The INA214CIRSWT functions fully with REF floating or grounded.

Can the INA214CIRSWT be used for bidirectional current sensing?

Yes - the INA214CIRSWT supports true bidirectional current sensing. When the shunt voltage polarity reverses (e.g., battery discharge vs. charge), the output voltage swings symmetrically around the REF voltage. With REF biased at mid-supply (e.g., 2.5 V on 5-V rail), the output ranges from ~0.05 V to ~4.95 V for ± full-scale current, enabling unambiguous direction detection in battery management systems.

What is the thermal performance difference between the RSW and SC70 packages for INA214CIRSWT?

The INA214CIRSWT in the RSW (10-pin Thin UQFN) package has R_θJB = 18.7 °C/W, significantly lower than the SC70's R_θJB = 72.1 °C/W. This 3.8× improvement in junction-to-board thermal resistance allows higher continuous power dissipation in compact layouts - critical for sustained 100-µA operation in sealed enclosures or multi-layer PCBs with limited copper area.

How does the INA214CIRSWT handle input filtering, and what series resistance is allowed?

The INA214CIRSWT permits up to 10 Ω of external series resistance per input (IN+, IN−) for EMI filtering, per TI's Equation 2 in SBOS437K Section 6.4.1. Exceeding 10 Ω introduces measurable gain error - e.g., 10 Ω adds ~0.9% error for INA214 due to its 10-kΩ internal R_INT. Layout best practice is to place filter resistors directly at the shunt and use shortest possible traces to IN+ and IN− pins to preserve accuracy.