Texas Instruments INA190A5IRSWT

Overview

INA190A5IRSWT from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier with 500 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 draws only 65 µA quiescent current, enabling microamp-level current measurement in high-side or low-side configurations for battery-powered systems.

For engineers reviewing the INA190A5IRSWT datasheet, INA190A5IRSWT pinout, INA190A5IRSWT application, or INA190A5IRSWT equivalent, this device supports precision bidirectional sensing in portable electronics, server PSUs, and battery test equipment where low input bias current (0.5 nA typ), rail-to-rail output swing, and enable-controlled shutdown are critical selection criteria.

Technical Context

The INA190A5IRSWT 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 sensing across shunts at bus voltages up to +40 V independent of its 1.7–5.5 V supply. Its zero-drift design maintains ±15 µV max offset and 80 nV/°C max drift over –40°C to +125°C.

This variant implements a fixed 500 V/V gain with ±0.4% max gain error and 27 kHz small-signal bandwidth (C_LOAD = 10 pF). The ENABLE pin (Pin 7) allows digital control of operation, reducing supply current to 100 nA max in shutdown while placing OUT in high-impedance state - essential for power-gated monitoring in energy-constrained designs.

Key Specifications

Pinout & Package

INA190A5IRSWT is packaged in a 10-pin UQFN (RSW) with 1.80 mm × 1.40 mm body size and wettable flank terminations for automated optical inspection. Pin 1 marked via top-side dot; exposed thermal pad (Pin 11) must be soldered to PCB ground plane for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA219BIDR and MAX4008AASA+, the INA190A5IRSWT uniquely combines 40 V common-mode range, ENABLE pin, REF-based bidirectionality, and ultra-low bias current in a 10-pin UQFN - making it the sole choice for high-accuracy, low-power, analog-output current monitoring in demanding industrial and portable applications.

Availability

INA190A5IRSWT is available at Aetrix Electronics and suitable for smartphone battery management, server PSU telemetry, and industrial battery test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for INA190A5IRSWT 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-constrained, battery-sensitive applications - emphasizing zero-drift performance, wide common-mode tolerance, and enable-controlled energy efficiency.

FAQ

What is the maximum common-mode voltage the INA190A5IRSWT can handle?

The INA190A5IRSWT 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 industrial buses or 48-V server rails without external level-shifting circuitry. The specification is validated across –40°C to +125°C and applies to both IN+ and IN− pins simultaneously.

How does the ENABLE pin function on the INA190A5IRSWT?

The ENABLE pin (Pin 7) on the INA190A5IRSWT controls device power state: driving it to VS activates normal operation (65 µA quiescent current), while driving it to GND places the device in shutdown mode (≤100 nA supply current, OUT in high-impedance state). This pin is exclusive to DDF and RSW packages - not present in SC70 variants - and must be actively driven, not left floating.

Can the INA190A5IRSWT perform bidirectional current sensing?

Yes, the INA190A5IRSWT supports bidirectional current sensing via its REF pin. Applying a mid-supply voltage (e.g., 2.5 V at 5 V VS) to REF centers the output voltage, so positive differential inputs (IN+ > IN−) raise V_OUT above REF and negative differentials lower it below REF. This enables single-supply measurement of charge/discharge current in battery systems without dual supplies or op-amp level-shifting stages.

What is the gain error specification for the INA190A5IRSWT?

The INA190A5IRSWT has a maximum gain error of ±0.4% across temperature (–40°C to +125°C) and supply voltage (1.7–5.5 V). At 25°C, typical gain error is ±0.08%. This error directly impacts current measurement accuracy - for example, with a 10 mΩ shunt and 500 V/V gain, ±0.4% gain error translates to ±0.2 A error at 50 A full-scale - making it suitable for precision PSU and BMS applications where calibration is minimized.

Does the INA190A5IRSWT require external filtering for EMI immunity?

The INA190A5IRSWT's ultra-low 0.5 nA input bias current allows effective use of RC filters (e.g., 1 kΩ + 10 nF) on IN+ and IN− without introducing significant offset or gain errors - unlike conventional current-sense amplifiers where filter resistors degrade accuracy. Such filtering suppresses high-frequency switching noise from DC-DC converters while preserving µA-level resolution, as confirmed in TI's SBOS863D application curves (Figures 20–22).