Texas Instruments INA190A3IRSWR

Overview

INA190A3IRSWR from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier with 100 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 mode. It is used in high-accuracy battery charge monitoring and server PSU current protection circuits.

For engineers reviewing the INA190A3IRSWR datasheet, INA190A3IRSWR pinout, INA190A3IRSWR application, or INA190A3IRSWR equivalent, this page delivers verified electrical specifications, package-specific terminal functions, real-world use cases for bidirectional sensing, and validated alternative parts for design flexibility under microamp-level current measurement constraints.

Technical Context

The INA190A3IRSWR uses a capacitively coupled front-end architecture to achieve ultra-low input bias current (0.5 nA typ) and high common-mode rejection (132 dB min), enabling accurate microamp-range current sensing without degrading accuracy via input filtering. Its zero-drift design maintains ±15 µV max offset and 80 nV/°C max drift across –40°C to +125°C.

This device supports both high-side and low-side configurations independent of supply voltage - common-mode range extends from –0.2 V to +40 V while VS can be as low as 1.7 V. The ENABLE pin (pin 7) places OUT in high-impedance state and reduces quiescent current to 100 nA max when driven to GND.

Key Specifications

Pinout & Package

INA190A3IRSWR is housed in a 10-pin UQFN (RSW) package measuring 1.80 mm × 1.40 mm with wettable flanks, optimized for space-constrained PCB layouts and automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA190A3IRSWR, INA219BIDR trades analog simplicity and enable control for digital integration and higher baseline accuracy, while MAX4008AASA+ offers tighter gain tolerance but sacrifices bidirectionality, wide common-mode range, and low-voltage operation - making INA190A3IRSWR uniquely suited for 1.7–5.5 V, ±40 V, microamp-to-amp bidirectional sensing.

Availability

INA190A3IRSWR is available at Aetrix Electronics and suitable for server power supplies, battery management systems, industrial PLCs, and telecom baseband units requiring stable component supply with guaranteed long-term manufacturability.

Supply support for INA190A3IRSWR 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 applications - targeting battery-powered devices, server PSUs, and industrial control systems demanding microamp-level resolution and 40-V common-mode robustness.

FAQ

What is the maximum common-mode voltage supported by the INA190A3IRSWR?

The INA190A3IRSWR 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 48-V rails without external level-shifting circuitry, and ensures reliable operation even during bus transients up to 40 V. The specification is guaranteed across the full –40°C to +125°C temperature range.

Does the INA190A3IRSWR support bidirectional current sensing, and how is it implemented?

Yes, the INA190A3IRSWR supports true bidirectional current sensing via its REF pin. When a reference voltage (e.g., VS/2) is applied to REF, positive differential input (IN+ > IN−) produces an output above VREF, while negative differential input produces an output below VREF. This enables single-supply detection of charge and discharge currents in battery applications without polarity-reversal circuitry - a core function confirmed in the device's functional block diagram and Electrical Characteristics table.

What is the purpose of the ENABLE pin on the INA190A3IRSWR, and what happens when it is grounded?

When the ENABLE pin (pin 7) of the INA190A3IRSWR is driven to GND, the device enters shutdown mode: output goes high-impedance, and quiescent current drops to ≤100 nA. This feature is essential for battery-operated systems requiring periodic current sampling. The ENABLE pin is only available in DDF (SOT-23-8) and RSW (UQFN-10) packages - confirmed in the Pin Configuration section and Feature Description of the official datasheet.

Can the INA190A3IRSWR operate from a 1.8-V supply, and what performance metrics are specified at that voltage?

Yes, the INA190A3IRSWR is fully specified down to 1.7 V supply and operates reliably at 1.8 V. At VS = 1.8 V, key parameters include: 65 µA typical quiescent current, ±15 µV max offset voltage, 132 dB min CMRR, 35 kHz bandwidth (A3 gain), and rail-to-rail output swing (GND + 1 mV to VS – 40 mV). These values are explicitly listed in the Recommended Operating Conditions and Electrical Characteristics tables of SBOS863D.

How does the ultra-low input bias current of 0.5 nA benefit system-level design with the INA190A3IRSWR?

The 0.5 nA typical input bias current of the INA190A3IRSWR minimizes voltage error across high-value sense resistors, enabling accurate microamp-range current measurement - e.g., 1 µA through a 10 kΩ shunt yields only 5 nV error. It also allows RC input filtering without accuracy degradation and supports larger shunts that reduce power loss in high-efficiency designs. This behavior is directly attributable to the device's capacitively coupled front-end architecture, as detailed in Section 7.3.2 of the datasheet.