Texas Instruments INA190A3IRSWT

Overview

INA190A3IRSWT from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier with 100 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 delivers 35 kHz bandwidth with 50 µA typical quiescent current - used in high-accuracy battery charge monitoring and server PSU overcurrent protection.

For engineers reviewing the INA190A3IRSWT datasheet, INA190A3IRSWT pinout, INA190A3IRSWT application, or INA190A3IRSWT equivalent, this page provides verified functional context, validated package mapping (UQFN-10), confirmed enable-pin behavior, and real-world design implications for microamp-level current sensing in high-side/low-side configurations.

Technical Context

The INA190A3IRSWT employs 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+ reaches +40 V while VS remains as low as 1.7 V. Its zero-drift core maintains ±80 nV/°C max offset drift across –40°C to +125°C.

With dedicated ENABLE pin (Pin 7), the device enters shutdown mode drawing ≤100 nA, placing OUT in high-impedance state. The REF pin (Pin 8) enables bidirectional sensing by offsetting the output baseline - critical for applications requiring current direction detection without polarity reversal.

Key Specifications

Pinout & Package

INA190A3IRSWT 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 INA190A3IRSWT, INA219BIDR trades analog flexibility for digital integration and reduced BOM count, while MAX40016AUB+ sacrifices offset and CMRR for bandwidth - making INA190A3IRSWT optimal for high-accuracy, enable-controlled, wide common-mode analog current sensing.

Availability

INA190A3IRSWT is available at Aetrix Electronics and suitable for server power supplies, USB-C PD chargers, and industrial IoT sensor nodes requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for INA190A3IRSWT 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 focused on 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 management, server PSUs, and portable electronics where microamp-level resolution and wide common-mode range are essential.

FAQ

What is the maximum common-mode voltage the INA190A3IRSWT can handle?

The INA190A3IRSWT 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 level-shifting circuitry. The specification is guaranteed across –40°C to +125°C and applies to both IN+ and IN– pins referenced to GND.

Does the INA190A3IRSWT require external components for stable operation?

Yes - the INA190A3IRSWT requires a 0.1 µF ceramic bypass capacitor between VS and GND, placed within 1 mm of the pins. For noise-sensitive applications, a 100-pF capacitor may be added across the IN+/IN– inputs. No external gain-setting resistors are needed since INA190A3IRSWT has fixed 100 V/V gain internally.

How does the ENABLE pin function on the INA190A3IRSWT?

The ENABLE pin (Pin 7) controls power state: driven to VS for normal operation (50 µA IQ), driven to GND for shutdown (≤100 nA IQ, OUT in high-impedance). It is not internally pulled - must be actively driven or tied to VS if unused. This pin is only available in DDF and RSW packages, including INA190A3IRSWT.

Can the INA190A3IRSWT measure bidirectional current without external op-amps?

Yes - the INA190A3IRSWT supports true bidirectional sensing via its REF pin. Applying a mid-supply voltage (e.g., 2.5 V on 5-V system) establishes a zero-current output baseline. Positive IN+–IN– yields OUT > VREF; negative yields OUT < VREF - all within single-supply operation and without external components.

What is the typical output swing capability of the INA190A3IRSWT?

The INA190A3IRSWT provides rail-to-rail output swing: minimum high-level output is VS – 40 mV, and minimum low-level output is GND + 1 mV (at TA = –40°C to +125°C, RL = 10 kΩ). This maximizes dynamic range when interfacing with low-voltage MCUs - e.g., delivering 1.76 V full-scale swing on a 1.8-V supply.