Texas Instruments INA190A5IDDFR

Overview

INA190A5IDDFR 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 features an ENABLE pin for low-power shutdown (100 nA max), enabling microamp-level current measurement in high-side or low-side configurations for battery-powered systems.

For engineers reviewing the INA190A5IDDFR datasheet, INA190A5IDDFR pinout, INA190A5IDDFR application, or INA190A5IDDFR equivalent, key selection criteria include its 500 V/V gain accuracy (±0.4% max), 27 kHz bandwidth, rail-to-rail output swing (GND + 1 mV / VS – 40 mV), and SOT-23-8 (DDF) package compatibility with high-density PCB layouts requiring bidirectional sensing and ultra-low quiescent current.

Technical Context

The INA190A5IDDFR uses a capacitively coupled front-end architecture to achieve 150 dB typical CMRR and reject DC common-mode shifts - critical for stable operation when sensing across shunts on noisy 40 V bus rails. Its zero-drift design maintains ±80 nV/°C max offset drift over –40°C to +125°C, ensuring accuracy in thermal-varying environments like server PSUs or battery test equipment.

This device implements bidirectional sensing via external REF pin biasing (0 V to VS), allowing output polarity to indicate current direction relative to the sense resistor. The ENABLE pin (Pin 2) controls functional state: logic-high enables full operation (65 µA IQ typ); logic-low disables output (high-Z) and reduces supply current to ≤100 nA - essential for duty-cycled monitoring in portable electronics.

Key Specifications

Pinout & Package

SOT-23-8 (DDF) package: 1.60 mm × 2.90 mm body, 0.95 mm height, surface-mount, moisture-sensitive level 1. Pin 1 marked by dot; pin 1–8 arranged counterclockwise from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA219BIDR and MAX40086AUT#T, the INA190A5IDDFR uniquely combines 40 V common-mode range, ENABLE-controlled ultra-low shutdown current (100 nA), and analog voltage output - making it the only option for battery-constrained, high-voltage, analog-feedback systems requiring precise bidirectional sensing.

Availability

INA190A5IDDFR is available at Aetrix Electronics and suitable for server power supply monitoring, battery charge/discharge control, industrial motor drive phase sensing, and portable medical device battery safety requiring stable component supply and long-term production continuity.

Supply support for INA190A5IDDFR 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, thermally demanding applications - including computing, telecom, and portable electronics - where traditional amplifiers fail due to CMRR limitations or excessive quiescent current.

FAQ

What is the maximum common-mode voltage the INA190A5IDDFR can handle?

The INA190A5IDDFR 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 40 V bus rails without level-shifting circuitry. The specification is validated across –40°C to +125°C and applies to both IN+ and IN− pins simultaneously, as confirmed in Section 6.3 of the SBOS863D datasheet.

Does the INA190A5IDDFR support bidirectional current sensing, and how is it implemented?

Yes, the INA190A5IDDFR supports bidirectional current sensing via its REF pin. Applying a reference voltage (e.g., VS/2) to REF establishes the zero-current output level; positive differential input (IN+ > IN−) produces OUT > VREF, while negative differential input produces OUT < VREF. This analog polarity encoding enables single-supply ADC interfacing for battery charge/discharge monitoring without external op-amps.

What is the ENABLE pin functionality on the INA190A5IDDFR, and what happens when it is grounded?

When the ENABLE pin (Pin 2) of the INA190A5IDDFR is driven low (≤0.3×VS), the device enters shutdown mode: output goes high-impedance, and supply current drops to ≤100 nA. This state is fully specified in the Electrical Characteristics table (Section 6.5) and enables ultra-low-power duty-cycled current monitoring in battery-operated devices.

What is the typical bandwidth and settling time of the INA190A5IDDFR at its 500 V/V gain setting?

At 500 V/V gain, the INA190A5IDDFR has a typical small-signal bandwidth of 27 kHz and settles to within 1% of final value in 30 µs after a current step. These values are measured with CLOAD = 10 pF and are specified in the Electrical Characteristics table (Section 6.5) - critical for closed-loop current control in switching power supplies and motor drives.

How does the zero-drift architecture of the INA190A5IDDFR improve measurement accuracy over temperature?

The zero-drift architecture of the INA190A5IDDFR limits offset voltage drift to ±80 nV/°C max over –40°C to +125°C. This ensures that offset-induced error remains below ±10 µV across the full temperature range - significantly tighter than conventional amplifiers - preserving accuracy in thermally unstable environments like server chassis or automotive under-hood modules.