Texas Instruments INA190A1IRSWT

Overview

INA190A1IRSWT from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier with 25 V/V fixed gain, ±15 µV max offset voltage, 132 dB min CMRR, and –0.2 V to +40 V wide common-mode input range. It operates from 1.7 V to 5.5 V supply and supports high-side/low-side sensing in battery-powered portable electronics requiring microamp-level current measurement accuracy.

For engineers reviewing the INA190A1IRSWT datasheet, INA190A1IRSWT pinout, INA190A1IRSWT application, or INA190A1IRSWT equivalent, this page delivers verified specifications, package-validated pin functions, real-world use cases for bidirectional sensing, and two technically documented alternative parts - all aligned to the RSW (10-pin UQFN) variant with ENABLE functionality.

Technical Context

The INA190A1IRSWT uses a capacitively coupled front-end architecture to achieve ultra-low input bias current (0.5 nA typ) and reject DC common-mode voltage shifts, enabling stable operation when VIN+ exceeds VS by up to 38.3 V. Its zero-drift design maintains <80 nV/°C offset drift across –40°C to +125°C, critical for long-term accuracy in thermal-varying environments.

This device integrates an internal difference amplifier stage following the capacitive input, delivering rail-to-rail output swing (GND +1 mV / VS –40 mV) and 35 kHz bandwidth at 25 V/V gain. The ENABLE pin (Pin 7) places OUT in high-impedance state and reduces quiescent current to 100 nA max when driven low - a key enabler for duty-cycled current monitoring in energy-constrained systems.

Key Specifications

Pinout & Package

INA190A1IRSWT is packaged in a 10-pin UQFN (RSW) with 1.80 mm × 1.40 mm body size, 0.4 mm pitch, and wettable flank terminals for automated optical inspection (AOI). Thermal resistance R_θJA = 163.8°C/W enables operation at full spec under 100 mW power dissipation in standard PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA210AIDR and MAX40086AUT#T, the INA190A1IRSWT uniquely combines ENABLE-controlled ultra-low shutdown current (≤100 nA), true bidirectional sensing via REF, and 40 V common-mode capability - making it the only option among the three qualified for precision, low-power, high-voltage bidirectional current monitoring in portable and industrial systems.

Availability

INA190A1IRSWT is available at Aetrix Electronics and suitable for smartphone battery management, server PSU protection, portable medical diagnostics, and industrial IoT sensor node designs requiring stable component supply, long-lifecycle availability, and traceable sourcing.

Supply support for INA190A1IRSWT 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 INA190 product line was designed for high-accuracy, low-power current sensing in space- and energy-constrained applications - including battery-powered consumer electronics, telecom infrastructure, and industrial automation systems requiring microamp-level resolution and 40 V common-mode tolerance.

FAQ

What is the maximum common-mode voltage the INA190A1IRSWT can handle?

The INA190A1IRSWT supports a common-mode input voltage range of –0.2 V to +40 V, independent of its 1.7 V to 5.5 V supply voltage. This allows direct high-side sensing on 36-V bus rails without external level-shifting circuitry. The specification is validated across –40°C to +125°C and applies specifically to the RSW package variant of the INA190A1IRSWT.

Does the INA190A1IRSWT support bidirectional current sensing, and how is it implemented?

Yes, the INA190A1IRSWT supports bidirectional current sensing via its REF pin. Applying a mid-supply voltage (e.g., VS/2) to REF centers the output voltage; positive differential input produces V_OUT > V_REF, negative differential produces V_OUT < V_REF. This function is fully specified for the INA190A1IRSWT and requires no external components beyond the sense resistor and REF decoupling capacitor.

What is the typical quiescent current of the INA190A1IRSWT in enabled and disabled states?

In enabled state, the INA190A1IRSWT draws 50 µA typical quiescent current at 25°C. When the ENABLE pin is driven low, quiescent current drops to 100 nA maximum - confirmed in the Electrical Characteristics table for the RSW package. This ultra-low shutdown current is a defining feature of the INA190A1IRSWT and enables multi-year battery life in duty-cycled applications.

Can the INA190A1IRSWT be used with a 1.8-V supply, and what is its output swing capability at that voltage?

Yes, the INA190A1IRSWT is fully specified down to 1.7 V supply and operates reliably at 1.8 V. At this voltage, its output swings from GND +1 mV to VS –40 mV - i.e., 1.0 mV to 1.76 V - providing >97% of full-scale range for 12-bit ADC interfacing. This rail-to-rail performance is measured and guaranteed for the INA190A1IRSWT in the RSW package.

What is the gain error specification for the INA190A1IRSWT, and how does it impact current measurement accuracy?

The INA190A1IRSWT has a maximum gain error of ±0.2% across temperature and supply voltage. For a 25 V/V device measuring 100 mV across a shunt, this contributes ±0.2 mV absolute error - equivalent to ±8 µA error with a 25 mΩ resistor. This specification is explicitly defined for the A1 variant (INA190A1IRSWT) and dominates total error at full-scale current, unlike offset error which dominates at light loads.