Texas Instruments INA190A1IRSWR

Overview

INA190A1IRSWR from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier in a 10-pin UQFN package, featuring 25 V/V fixed gain, ±15 µV max offset voltage, and –0.2 V to +40 V wide common-mode input range. It enables microamp-level current measurement in high-side or low-side configurations with 50 µA typical quiescent current and 100 nA max shutdown current, supporting battery-powered consumer electronics and server power supplies.

For engineers reviewing the INA190A1IRSWR datasheet, INA190A1IRSWR pinout, INA190A1IRSWR application, or INA190A1IRSWR equivalent, this page delivers verified technical context, real-world use cases, validated alternatives, and supply-chain readiness - all grounded in TI's SBOS863D production data sheet (November 2019 revision).

Technical Context

The INA190A1IRSWR employs a capacitively coupled front-end architecture to achieve 132 dB min CMRR and block DC common-mode voltages, enabling accurate sensing across ±0.2 V to +40 V bus rails independent of its 1.7–5.5 V supply. Its zero-drift design maintains 80 nV/°C max offset drift and 7 ppm/°C max gain drift over –40°C to +125°C.

This variant integrates an ENABLE pin (Pin 7) for power-gated operation, reducing supply current to ≤100 nA when disabled and placing OUT in high-impedance state. The 25 V/V gain option targets mid-range current measurements where dynamic range and low noise (75 nV/√Hz) are critical - e.g., smartphone battery charging and BBU current monitoring.

Key Specifications

Pinout & Package

INA190A1IRSWR is housed in a 10-pin ultra-thin UQFN package (1.80 mm × 1.40 mm, 0.5-mm pitch), optimized for space-constrained PCB layouts in mobile and networking equipment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA219BIDR and MAX4008AUB+, the INA190A1IRSWR uniquely combines 40 V common-mode tolerance, ENABLE-controlled ultra-low shutdown current, and true bidirectional analog output - making it the only choice for high-reliability, mixed-signal power monitoring in 5G infrastructure and next-gen portable chargers.

Availability

INA190A1IRSWR is available at Aetrix Electronics and suitable for smartphone battery management, server PSU current protection, and 5G baseband unit power optimization requiring stable component supply across extended product lifecycles.

Supply support for INA190A1IRSWR 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 product line was designed specifically for high-accuracy, low-power current sensing in space- and energy-constrained systems - targeting battery-powered consumer devices, telecom infrastructure, and industrial power supplies demanding ±0.2% gain accuracy and sub-µA shutdown current.

FAQ

What is the maximum common-mode voltage the INA190A1IRSWR can handle?

The INA190A1IRSWR 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 36-V server rails without external level-shifting. The specification is validated per TI SBOS863D Rev D, Section 6.3, and applies across the full –40°C to +125°C operating temperature range. Exceeding +40 V risks permanent damage per Absolute Maximum Ratings.

Does the INA190A1IRSWR support bidirectional current sensing, and how is it implemented?

Yes, the INA190A1IRSWR supports true bidirectional current sensing via its REF pin. When a reference voltage (e.g., VS/2 = 2.5 V) is applied to REF, positive differential input (IN+ > IN–) yields OUT > VREF, while negative differential input yields OUT < VREF. This enables single-supply monitoring of charge/discharge currents in battery systems. The feature is documented in Section 7.3.4 and Figure 1 of SBOS863D.

What is the function of the ENABLE pin on the INA190A1IRSWR, and what happens when it is grounded?

The ENABLE pin (Pin 7) controls power state: driven to VS, the device operates normally (50 µA IQ); driven to GND, it enters shutdown mode with ≤100 nA supply current and places the OUT pin in high-impedance state. This pin is exclusive to DDF and RSW packages - confirmed in Pin Functions table (Section 5) and Feature bullet "ENABLE pin available only in DDF and RSW packages" (page 1).

How does the zero-drift architecture of the INA190A1IRSWR improve measurement accuracy?

The zero-drift architecture achieves <15 µV max offset voltage and 80 nV/°C max offset drift, minimizing temperature-induced errors in long-duration measurements. This allows smaller shunt resistors (reducing power loss) while maintaining accuracy at light loads - e.g., detecting 1 µA through a 1 kΩ shunt. Data is specified in Section 6.5 Electrical Characteristics and validated in Figure 2 (Offset vs Temperature).

Can the INA190A1IRSWR be used with a 1.8-V supply, and what is its output swing capability at that voltage?

Yes, the INA190A1IRSWR operates down to 1.7 V supply; at VS = 1.8 V, its output swings from GND +1 mV to VS –40 mV (i.e., 1.76 V), delivering >97% of full-scale range to 12-bit ADCs. This rail-to-rail performance is specified in Section 6.5 (VSP/VSN parameters) and enables high-resolution current digitization without external op-amp buffering.