Texas Instruments INA190A2IDDFT

Overview

INA190A2IDDFT from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier with 50 V/V fixed gain, ±0.3% max gain error, ±15 µV max offset voltage, and 132 dB min CMRR. It operates from 1.7 V to 5.5 V supply, supports –0.2 V to +40 V common-mode input range, and features an ENABLE pin for low-power shutdown in SOT-23-8 (DDF) package - used in battery test equipment and merchant server PSUs for microamp-level current monitoring.

For engineers reviewing the INA190A2IDDFT datasheet, INA190A2IDDFT pinout, INA190A2IDDFT application, or INA190A2IDDFT equivalent, this page delivers verified specifications, validated pin functions, confirmed bidirectional sensing capability, real-world use cases in high-side/low-side configurations, and two technically documented alternative parts with explicit functional and application differences.

Technical Context

The INA190A2IDDFT uses a capacitively coupled front-end architecture to achieve 132 dB minimum common-mode rejection and enable operation with input common-mode voltages up to +40 V - independent of its 1.7–5.5 V supply rail. Its zero-drift design maintains ±15 µV max offset and 80 nV/°C max drift across –40°C to +125°C.

This device implements bidirectional sensing via external REF pin biasing, delivering rail-to-rail output swing (VS – 40 mV / GND + 1 mV) and 37 kHz small-signal bandwidth at 50 V/V gain. The ENABLE pin (Pin 2 in DDF package) reduces quiescent current to 100 nA max in shutdown mode while placing OUT in high-impedance state.

Key Specifications

Pinout & Package

SOT-23-8 (DDF) package: 1.60 mm × 2.90 mm body, 0.65 mm pitch, moisture sensitivity level 1, rated for –40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA190A2IDDFT, INA219BIDR trades analog output and ENABLE functionality for integrated I²C communication and tighter gain accuracy, while MAX4008AASA+ extends common-mode range but sacrifices bidirectionality, low bias current, and power-gating capability - making INA190A2IDDFT optimal for precision, low-power, bidirectional analog current monitoring in 1.7–5.5 V systems.

Availability

INA190A2IDDFT is available at Aetrix Electronics and suitable for server power supply monitoring, battery test equipment, smartphone charger IC feedback, and baseband unit (BBU) power management requiring stable component supply across industrial temperature grades and long production lifecycles.

Supply support for INA190A2IDDFT 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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, power management, and signal chain solutions.

The INA190 product line delivers ultra-low-input-bias, zero-drift current-sense amplifiers for high-accuracy, low-power, bidirectional current monitoring in battery, computing, and telecom infrastructure applications.

FAQ

What is the maximum common-mode voltage supported by the INA190A2IDDFT?

The INA190A2IDDFT 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 telecom rails without external level-shifting circuitry. The specification is guaranteed across –40°C to +125°C and is validated per TI's SBOS863D datasheet Section 6.3.

Does the INA190A2IDDFT support bidirectional current sensing, and how is it implemented?

Yes, the INA190A2IDDFT supports bidirectional current sensing via its REF pin. Applying a mid-supply voltage (e.g., VS/2) to REF centers the output at that voltage; positive differential input (IN+ > IN−) drives OUT above REF, while negative differential input drives OUT below REF. This enables accurate charge/discharge current measurement in battery systems without polarity-switching circuitry.

What is the function of the ENABLE pin on the INA190A2IDDFT, and what happens when it is grounded?

The ENABLE pin (Pin 2 in DDF package) controls power state: driven to VS for normal operation (65 µA IQ), grounded to enter shutdown mode (≤100 nA IQ). In shutdown, the output enters high-impedance state and internal biasing is disabled. This feature is critical for duty-cycled current monitoring in portable devices - and is exclusive to DDF and RSW packages per TI SBOS863D Revision D.

What is the typical input bias current of the INA190A2IDDFT, and why does it matter for low-current applications?

The INA190A2IDDFT has a typical input bias current of 0.5 nA, with max 3 nA across temperature. This ultra-low value enables accurate microamp-range current measurement using high-value sense resistors (e.g., 1 kΩ), minimizing self-heating and power loss while preserving signal integrity - a key differentiator versus conventional current-sense amplifiers with >100 nA bias.

How does the zero-drift architecture of the INA190A2IDDFT improve measurement accuracy over temperature?

The zero-drift architecture of the INA190A2IDDFT limits offset voltage drift to 80 nV/°C max and maintains ±15 µV max offset across –40°C to +125°C. This eliminates the need for periodic recalibration in thermally varying environments - such as server PSUs or outdoor telecom BBUs - and ensures consistent accuracy whether measuring 1 mA or 10 A through the same shunt resistor.