Texas Instruments INA190A4IRSWT

Overview

INA190A4IRSWT from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier with 200 V/V fixed gain, ±15 µV max offset voltage, and –0.2 V to +40 V common-mode input range. It operates from 1.7 V to 5.5 V supply, draws 65 µA quiescent current (typ), and features an ENABLE pin for low-power shutdown mode. It is used in high-accuracy battery charge monitoring and server PSU current sensing where microamp-level resolution and rail-to-rail output swing are required.

For engineers reviewing the INA190A4IRSWT datasheet, INA190A4IRSWT pinout, INA190A4IRSWT application, or INA190A4IRSWT 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 INA190A4IRSWT employs a capacitively coupled front-end architecture enabling ultra-low input bias current (0.5 nA typ) and high common-mode rejection (132 dB min), critical for accurate microamp-range current measurement across shunt resistors. Its zero-drift design maintains ±15 µV max offset and 80 nV/°C max drift over –40°C to +125°C, supporting stable bidirectional sensing with external REF voltage biasing.

This UQFN-10 device integrates ENABLE functionality - absent in SC70/SOT-23 variants - allowing digital control of operational state: when ENABLE = VS, it delivers 33 kHz bandwidth and rail-to-rail output (GND +1 mV / VS –40 mV); when ENABLE = GND, output enters high-Z state and supply current drops to 100 nA max.

Key Specifications

Pinout & Package

The INA190A4IRSWT is packaged in a 10-pin UQFN (1.80 mm × 1.40 mm, 0.5-mm pitch) with wettable flanks, optimized for space-constrained PCBs and automated optical inspection. Thermal resistance R_θJA is 163.8°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA190A4IRSWT, INA219BIDR trades analog flexibility and low-voltage support for integrated digital telemetry, while MAX4008AUA+T offers higher speed but sacrifices enable control, bidirectionality, and sub-2-V operation - making INA190A4IRSWT optimal for precision, low-power, analog-based current monitoring in compact, wide-input-voltage systems.

Availability

INA190A4IRSWT is available at Aetrix Electronics and suitable for server power supplies, battery charge management systems, telecom baseband units, and smartphone power monitoring requiring stable component supply, long-term lifecycle support, and guaranteed authentic sourcing.

Supply support for INA190A4IRSWT 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 current sensing in space-constrained, wide common-mode applications - targeting server PSUs, battery management, and telecom infrastructure where µA-level resolution and robustness across –40°C to +125°C are essential.

FAQ

What is the maximum common-mode voltage the INA190A4IRSWT can handle?

The INA190A4IRSWT 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 across –40°C to +125°C and is not degraded by supply voltage variations - a key advantage over conventional current-sense amplifiers constrained by VS.

Does the INA190A4IRSWT support bidirectional current sensing, and how is it implemented?

Yes, the INA190A4IRSWT supports true bidirectional current sensing via its REF pin. When a reference voltage (e.g., 2.5 V) is applied to REF, the output becomes V_OUT = 200 × (V_IN+ – V_IN−) + V_REF. A positive differential input produces V_OUT > V_REF; a negative differential input produces V_OUT < V_REF. This enables single-supply, single-ended measurement of both charge and discharge currents - essential for battery gauge and motor control applications.

What is the purpose of the ENABLE pin on the INA190A4IRSWT, and how does it affect power consumption?

The ENABLE pin on the INA190A4IRSWT controls functional state: driving it to ≥0.7×V_S activates normal operation (65 µA quiescent current), while driving it to ≤0.3×V_S places the device in shutdown mode (≤100 nA supply current) and forces the output into high-impedance. This feature is exclusive to DDF and RSW packages - including INA190A4IRSWT - and enables duty-cycled current monitoring to extend battery life in portable systems without sacrificing measurement fidelity.

How does the zero-drift architecture of the INA190A4IRSWT improve measurement accuracy?

The zero-drift architecture of the INA190A4IRSWT achieves ±15 µV max offset voltage and 80 nV/°C max offset drift over –40°C to +125°C. This eliminates calibration drift in thermally varying environments and enables accurate microamp-level current measurement - for example, resolving 75 µA with 100 mΩ shunt and 10-bit ADC. Unlike chopper-stabilized amplifiers, it avoids switching artifacts that could interfere with sensitive analog measurements.

Can the INA190A4IRSWT be used with a 1.8-V supply, and what output swing is guaranteed?

Yes, the INA190A4IRSWT is fully specified for 1.7–5.5 V operation, including 1.8 V. At 1.8 V supply, it guarantees output swing to GND +1 mV and VS –40 mV (i.e., 1.76 V), delivering 1.759 V usable range. This rail-to-rail performance maximizes ADC utilization - especially critical for low-voltage, high-resolution systems like wearables and IoT edge nodes where every millivolt of dynamic range matters.