Texas Instruments INA190A4IRSWR

Overview

INA190A4IRSWR from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier with 200 V/V fixed gain, ±0.3% max gain error, ±15 µV max offset voltage, and 132 dB min CMRR. It operates from 1.7 V to 5.5 V supply, supports –0.2 V to +40 V common-mode input range, and features an ENABLE pin for low-power shutdown in its 10-pin UQFN (RSW) package. It is used for high-accuracy microamp-to-amp current monitoring in battery-powered systems.

For engineers reviewing the INA190A4IRSWR datasheet, INA190A4IRSWR pinout, INA190A4IRSWR application, or INA190A4IRSWR equivalent, this page delivers verified specifications, validated pin functions for the RSW package, real-world use cases in bidirectional sensing, and confirmed alternative parts with documented technical and application differences.

Technical Context

The INA190A4IRSWR employs a capacitively coupled front-end architecture that blocks DC common-mode voltage while enabling operation up to +40 V - independent of its 1.7–5.5 V supply rail. Its zero-drift design achieves ±15 µV max offset and 80 nV/°C max drift, supporting accurate microamp-level current measurement with large sense resistors.

It integrates an ENABLE pin (Pin 7) that places the output in high-impedance state and reduces quiescent current to ≤100 nA when driven low. With 200 V/V gain, it delivers 33 kHz bandwidth (C_LOAD = 10 pF), 0.3 V/µs slew rate, and rail-to-rail output swing (GND +1 mV to VS –40 mV), optimized for low-voltage, high-dynamic-range sensing in portable and power-constrained systems.

Key Specifications

Pinout & Package

The INA190A4IRSWR is packaged in a 10-pin UQFN (RSW) with 1.80 mm × 1.40 mm body size and wettable flanks. Thermal resistance is R_θJA = 163.8°C/W and R_θJB = 93.3°C/W, suitable for compact PCB layouts with moderate power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA219BIDR and MAX4008AUA+T, the INA190A4IRSWR uniquely combines 1.7 V operation, ENABLE-controlled shutdown, true bidirectionality via REF, and ±15 µV offset - making it the only option for µA-resolution, low-voltage, duty-cycled, and polarity-agnostic current sensing in space-constrained designs.

Availability

INA190A4IRSWR is available at Aetrix Electronics and suitable for smartphone battery management, server PSU current monitoring, USB-C power delivery analyzers, and industrial IoT sensor nodes requiring stable component supply across long production lifecycles.

Supply support for INA190A4IRSWR 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 INA190 family was designed specifically for high-accuracy, low-power, wide common-mode current sensing in portable, computing, and infrastructure power systems - emphasizing zero-drift performance, microamp input bias, and flexible bidirectional operation.

FAQ

What is the maximum common-mode voltage the INA190A4IRSWR can handle?

The INA190A4IRSWR supports a common-mode input voltage range of –0.2 V to +40 V, independent of its 1.7–5.5 V supply voltage. This allows direct high-side sensing on 12 V, 24 V, or 40 V rails without external level-shifting. The specification is guaranteed across –40°C to +125°C and applies to both IN+ and IN− pins referenced to GND.

Does the INA190A4IRSWR support bidirectional current sensing, and how is it implemented?

Yes, the INA190A4IRSWR supports true bidirectional current sensing via its REF pin. When a reference voltage (e.g., V_S/2) is applied to REF, the output becomes V_OUT = V_REF + 200 × (V_IN+ − V_IN−). Positive differential input yields V_OUT > V_REF; negative yields V_OUT < V_REF. This enables single-supply, single-ended ADC interfacing for both charge and discharge current measurement.

What is the purpose of the ENABLE pin on the INA190A4IRSWR, and what happens when it is pulled low?

The ENABLE pin (Pin 7) controls power state: when driven ≥0.7×V_S, the INA190A4IRSWR operates normally with 65 µA typical quiescent current; when pulled ≤0.3×V_S, it enters shutdown mode - reducing supply current to ≤100 nA and placing the OUT pin in high-impedance state. This feature is essential for battery-powered applications requiring periodic current sampling.

Can the INA190A4IRSWR be used with a 1.8 V supply, and what performance trade-offs occur?

Yes, the INA190A4IRSWR is fully specified down to 1.7 V supply, including 132 dB CMRR, ±15 µV offset, and 33 kHz bandwidth at 1.8 V. Output swing remains rail-to-rail (GND +1 mV to V_S –40 mV), preserving dynamic range. Quiescent current increases slightly to 90 µA max over temperature, but remains compatible with ultra-low-power designs.

What package type does the INA190A4IRSWR use, and why is it suitable for space-constrained designs?

The INA190A4IRSWR uses the 10-pin UQFN (RSW) package with 1.80 mm × 1.40 mm body size and wettable flanks. Its compact footprint, low profile (<0.5 mm height), and thermal metrics (R_θJA = 163.8°C/W) make it ideal for dense PCB layouts in smartphones, wearables, and modular PSUs where area and thermal performance are critical.