Texas Instruments INA215CIRSWT

Overview

INA215CIRSWT from Texas Instruments is a voltage-output, zero-drift current-shunt monitor optimized for bidirectional high- or low-side current sensing in power management systems. It features 75 V/V fixed gain, ±60 µV max input offset voltage (RTI), 0.5 µV/°C max offset drift, –0.1 V to 26 V common-mode input range, and operates from 2.7 V to 26 V supply with ≤100 µA quiescent current. It enables accurate 10-mV full-scale shunt measurements in battery chargers and telecom power rails.

For engineers reviewing the INA215CIRSWT datasheet, INA215CIRSWT pinout, INA215CIRSWT application, or INA215CIRSWT equivalent, this page delivers verified specifications, package mapping to the 10-pin Thin UQFN (RSW), functional pin roles, real-world use cases in power-constrained systems, and two validated alternative parts with documented technical and application differences.

Technical Context

The INA215CIRSWT implements a precision zero-drift chopper-stabilized amplifier architecture with matched internal resistor networks (R_INT = 13.3 kΩ) to achieve high CMRR (105–140 dB) and low gain error (±0.5% max over temperature). Its differential input stage operates independently of supply voltage, allowing measurement of shunt voltages at common-mode potentials up to 26 V while powered from as low as 2.7 V.

It supports bidirectional current sensing via reference voltage (REF) pin biasing, delivers rail-to-rail output swing (within 50 mV of V+ and 5 mV of GND), and maintains 40 kHz bandwidth with 0.4 V/µs slew rate. The device is specified across –40°C to +125°C and exhibits 25 nV/√Hz input-referred voltage noise.

Key Specifications

Pinout & Package

INA215CIRSWT 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 R_θJA = 107.3°C/W, enabling compact placement on thermally constrained PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA215CIRSWT, INA214AIRSWT offers higher gain but reduced low-end resolution, while INA226AIRSAT trades analog simplicity for digital configurability and multi-function integration-neither is pin-compatible, but both serve overlapping current-monitoring roles in power systems.

Availability

INA215CIRSWT is available at Aetrix Electronics and suitable for battery chargers, telecom power supplies, and notebook power management requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for INA215CIRSWT 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 amplifiers and power management ICs.

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

FAQ

What is the maximum common-mode voltage supported by the INA215CIRSWT?

The INA215CIRSWT 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 allows reliable high-side sensing on 24-V industrial rails and low-side sensing near ground potential. Operation beyond 26 V requires external transient protection circuitry per TI's application guidance.

Does the INA215CIRSWT support bidirectional current measurement?

Yes, the INA215CIRSWT supports bidirectional current sensing through its REF pin. By biasing REF to mid-supply (e.g., V+/2), the output centers at that voltage, enabling positive and negative output swings corresponding to forward and reverse current flow across the shunt resistor. This is widely used in battery charge/discharge monitoring applications.

What is the purpose of the dual IN+ and IN− pins on the RSW package of the INA215CIRSWT?

The INA215CIRSWT's 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 differential paths. These pins must be externally tied together to ensure symmetrical layout, minimize phase mismatch, and preserve CMRR-especially critical in noisy power-conversion environments.

How does the gain error specification of ±0.5% for the INA215CIRSWT impact system accuracy?

The ±0.5% maximum gain error (Version C) of the INA215CIRSWT directly contributes to total current measurement uncertainty. At 10-mV full-scale shunt drop, this corresponds to ±50-µV output error-equivalent to ±0.67 mA error for a 75-Ω effective shunt. Combined with ±60-µV offset, total uncalibrated error remains under ±0.1% of full scale, enabling high-fidelity power budgeting without factory trimming.

Can the INA215CIRSWT operate from a 3.3-V supply while measuring a 24-V rail?

Yes-the INA215CIRSWT operates from 2.7 V to 26 V and senses shunt voltages at common-mode potentials up to 26 V independently of its supply voltage. A 3.3-V supply is fully compatible with monitoring a 24-V rail, provided the REF pin is appropriately biased and output loading remains within drive capability (e.g., ≥10 kΩ).