Texas Instruments INA190A4IDCKT

Overview

INA190A4IDCKT from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier with 200 V/V fixed gain, ±15 µV max offset voltage, and 132 dB min common-mode rejection ratio. It operates from 1.7 V to 5.5 V supply, supports –0.2 V to +40 V input common-mode range, and delivers rail-to-rail output swing - enabling accurate microamp-level current measurement in high-side or low-side configurations for battery-powered systems.

For engineers reviewing the INA190A4IDCKT datasheet, INA190A4IDCKT pinout, INA190A4IDCKT application, or INA190A4IDCKT equivalent, this device is selected for ultra-low-power, high-accuracy current monitoring where input bias current (0.5 nA typ), gain error (±0.3% max), and temperature drift (80 nV/°C max offset drift) directly impact system-level power budgeting, shunt resistor sizing, and dynamic range in portable electronics and server PSUs.

Technical Context

The INA190A4IDCKT uses a capacitively coupled front-end architecture to achieve high common-mode rejection (132 dB min) independent of supply voltage, allowing operation with bus voltages up to +40 V while powered from as low as 1.7 V. Its zero-drift design maintains ±15 µV max offset over –40°C to +125°C, enabling stable microamp-range sensing without calibration.

It features an enable-controlled shutdown mode (100 nA max quiescent current) and bidirectional capability via external REF pin biasing. The SC70-6 package lacks ENABLE functionality - confirming that pin 7 is NC for INA190A4IDCKT, unlike DDF/RSW variants.

Key Specifications

Pinout & Package

INA190A4IDCKT is housed in a 6-pin SC70 package (2.00 mm × 1.25 mm body size) with no ENABLE pin - consistent with TI's documentation stating ENABLE is available only in DDF (SOT-23-8) and RSW (UQFN-10) packages. Pin 7 is NC for this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA210A4IDCKT and MAX40010FAUT#X, INA190A4IDCKT delivers superior offset stability, higher CMRR, and native bidirectional support in the same footprint - making it optimal for battery analytics, precision PSU telemetry, and energy-harvesting systems demanding sub-microamp resolution.

Availability

INA190A4IDCKT is available at Aetrix Electronics and suitable for smartphone battery management, server PSU telemetry, USB-C PD validation, industrial IoT node power profiling, and high-side motor driver current monitoring requiring stable component supply across automotive-grade temperature ranges and multi-year production cycles.

Supply support for INA190A4IDCKT 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 for high-accuracy, low-power current sensing in space- and energy-constrained applications - including portable electronics, datacenter power supplies, and battery-powered industrial sensors - where zero-drift performance and wide common-mode range are essential.

FAQ

Does INA190A4IDCKT support bidirectional current sensing?

Yes, INA190A4IDCKT supports bidirectional current sensing via its REF pin. Applying a reference voltage (e.g., VS/2) to REF centers the output voltage; positive IN+–IN− produces output above REF, and negative differential input yields output below REF. This enables single-supply measurement of charge/discharge currents without external level-shifting circuitry.

What is the maximum common-mode voltage for INA190A4IDCKT?

The maximum common-mode voltage for INA190A4IDCKT is +40 V, with a minimum of –0.2 V. This range is independent of the supply voltage (1.7 V to 5.5 V), allowing direct high-side sensing on 12 V, 24 V, or 40 V rails - such as in server PSUs or industrial motor drives - without external attenuators or isolation.

Is the ENABLE pin available on INA190A4IDCKT?

No, the ENABLE pin is not available on INA190A4IDCKT. This SC70-6 variant has no ENABLE functionality; pins 1–6 are REF, GND, VS, IN+, IN−, and OUT respectively, with no pin 7 connection. ENABLE is only present in DDF (SOT-23-8) and RSW (UQFN-10) package variants of the INA190 family.

What shunt resistor value is recommended for 1 A full-scale measurement with INA190A4IDCKT?

For 1 A full-scale measurement, a 1 mΩ shunt resistor is recommended with INA190A4IDCKT. At 200 V/V gain, 1 A × 1 mΩ = 1 mV differential input → 200 mV output. This stays well within the device's output swing (GND +1 mV to VS –40 mV) and avoids saturation while maximizing SNR and minimizing I²R loss.

How does the zero-drift architecture improve long-term accuracy in INA190A4IDCKT?

The zero-drift architecture in INA190A4IDCKT reduces offset drift to 80 nV/°C max and holds offset voltage to ±15 µV over –40°C to +125°C. This eliminates thermal-induced errors during temperature cycling and prevents baseline drift over time - critical for battery capacity estimation, energy metering, and closed-loop power control where calibration intervals exceed months or years.