Texas Instruments INA190A5IRSWR

Overview

INA190A5IRSWR from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier with 500 V/V fixed gain, ±15 µV max offset voltage, and –0.2 V to +40 V wide common-mode input range. It operates from 1.7 V to 5.5 V supply, draws only 65 µA quiescent current, and features an ENABLE pin for low-power shutdown mode. It is used in high-accuracy battery charge monitoring and server PSU overcurrent protection circuits.

For engineers reviewing the INA190A5IRSWR datasheet, INA190A5IRSWR pinout, INA190A5IRSWR application, or INA190A5IRSWR equivalent, this page delivers verified technical context, package-specific pin functions, real-world use cases, and validated alternative options - all grounded in TI's SBOS863D production data sheet (Nov 2019).

Technical Context

The INA190A5IRSWR uses a capacitively coupled front-end architecture to achieve 132 dB minimum CMRR and reject DC common-mode voltage shifts - enabling stable operation even when bus voltage exceeds supply rail. Its zero-drift design maintains ±15 µV max offset and 80 nV/°C max drift across –40°C to +125°C, supporting microamp-level current measurement via large RSENSE values.

This UQFN-10 device integrates an ENABLE pin (Pin 7) that places OUT in high-impedance state and reduces supply current to ≤100 nA when driven low. Bidirectional sensing is implemented via REF pin biasing, allowing output swing from GND + 1 mV to VS – 40 mV with 27 kHz bandwidth at 500 V/V gain.

Key Specifications

Pinout & Package

INA190A5IRSWR is packaged in a 10-pin UQFN (1.80 mm × 1.40 mm, 0.4-mm pitch) 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 INA190A5IRSWR, INA219BIDR adds integrated conversion but sacrifices power efficiency and common-mode range, while MAX40086AUT+T matches gain and shutdown current but trades 85 µV higher offset and 12 dB lower CMRR - impacting accuracy in precision industrial sensing.

Availability

INA190A5IRSWR is available at Aetrix Electronics and suitable for server power supplies, USB-C battery charging systems, laptop fuel gauging, and industrial PLC analog input modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for INA190A5IRSWR 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 - including portable electronics, server infrastructure, and industrial automation systems.

FAQ

What is the maximum common-mode voltage the INA190A5IRSWR can handle?

The INA190A5IRSWR 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 bus rails without external level-shifting circuitry. The specification is validated per TI's SBOS863D datasheet Section 6.3, and applies across the full –40°C to +125°C operating temperature range. The INA190A5IRSWR maintains accuracy within datasheet limits up to +40 V on both IN+ and IN− pins simultaneously.

Does the INA190A5IRSWR require external components for stable operation?

Yes - the INA190A5IRSWR requires a 0.1 µF ceramic bypass capacitor between VS and GND, placed as close as possible to Pins 3 and 9. No external gain-setting resistors are needed since it features fixed 500 V/V internal gain. For optimal EMI rejection in noisy environments, TI recommends adding 100-Ω series resistors with 100-pF capacitors on IN+ and IN− lines - as shown in Figure 28 of the SBOS863D datasheet. The REF pin may be decoupled with a 0.01 µF capacitor if driven from a high-impedance source.

How does the ENABLE pin function on the INA190A5IRSWR?

The ENABLE pin (Pin 7) on the INA190A5IRSWR controls device activation: driving it to VS enables normal operation with 65 µA typical quiescent current, while pulling it to GND disables the amplifier, reducing supply current to ≤100 nA and placing the OUT pin in high-impedance state. This pin is only available in DDF (SOT-23-8) and RSW (UQFN-10) packages - confirmed in TI's SBOS863D Section 5 and Feature Description Section 7.3.3. It must be actively driven; floating is not recommended.

Can the INA190A5IRSWR measure bidirectional current without external op-amps?

Yes - the INA190A5IRSWR supports true bidirectional current sensing natively via its REF pin. Applying a mid-supply voltage (e.g., VS/2 = 1.65 V at 3.3 V) to REF establishes a zero-current output baseline. Positive differential input (IN+ > IN−) produces OUT > VREF; negative differential input produces OUT < VREF. This capability is specified in SBOS863D Sections 3 and 7.3.4, and requires no external components beyond the REF bias network. Output swing remains rail-to-rail (GND + 1 mV to VS – 40 mV), preserving full dynamic range.

What is the gain error specification for the INA190A5IRSWR, and how does it affect measurement accuracy?

The INA190A5IRSWR has a maximum gain error of ±0.4% across temperature (–40°C to +125°C), as specified in SBOS863D Section 6.5 Electrical Characteristics. At 25°C, typical gain error is ±0.08%. This error directly scales the sensed shunt voltage - for example, with a 10-mΩ shunt and 1-A load, a ±0.4% gain error introduces ±4-µV uncertainty in the output, translating to ±0.4 mA absolute current error. Combined with ±15 µV offset, total uncalibrated error remains under ±0.5% of full-scale at room temperature, meeting Class 0.5 metering requirements.