Texas Instruments INA190A5QDDFRQ1

Overview

INA190A5QDDFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive current-sense amplifier optimized for bidirectional microamp-level current monitoring in high-side or low-side configurations. It delivers 500 V/V fixed gain, ±15 µV max offset voltage, 132 dB min CMRR, and operates from 1.7 V to 5.5 V supply across –40°C to +125°C - enabling precise battery leakage detection in BMS and eCall power rails.

For engineers reviewing the INA190A5QDDFRQ1 datasheet, INA190A5QDDFRQ1 pinout, INA190A5QDDFRQ1 application, or INA190A5QDDFRQ1 equivalent, this page provides verified functional context, validated pin functions for the DDF (SOT-23-8) package, confirmed bidirectional sensing behavior with REF pin biasing, and two rigorously cross-checked alternative parts for automotive current measurement systems.

Technical Context

The INA190A5QDDFRQ1 uses a capacitively coupled front-end architecture to achieve ultra-low input bias current (500 pA typ) and reject DC common-mode voltage shifts - critical for stable operation at 40 V bus voltages while powered from 1.8 V. Its zero-drift design maintains ±15 µV offset and 80 nV/°C drift over temperature, enabling accurate sub-millivolt differential sensing.

This device implements true bidirectional sensing via externally applied REF voltage (GND to VS), where IN+–IN– > 0 yields OUT > VREF and IN+–IN– < 0 yields OUT < VREF. The ENABLE pin (DDF-only) reduces quiescent current to ≤100 nA and places OUT in high-impedance state, supporting duty-cycled monitoring in telematics control units.

Key Specifications

Pinout & Package

INA190A5QDDFRQ1 is packaged in an 8-pin SOT-23 (DDF) variant measuring 1.60 mm × 2.90 mm, with thermal resistance R_θJA = 164.6°C/W. This package includes the ENABLE pin - absent in the SC70 variant - enabling system-level power gating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A5QDRQ1 and MAX40056ATA+T, the INA190A5QDDFRQ1 uniquely combines AEC-Q100 Grade 1 operation, 500 pA input bias, ENABLE functionality, and REF-based bidirectionality - making it the only option qualified for microamp-level leakage detection in safety-critical automotive BMS and eCall subsystems.

Availability

INA190A5QDDFRQ1 is available at Aetrix Electronics and suitable for body control modules, telematics control units, and battery management systems requiring stable component supply across automotive production lifecycles.

Supply support for INA190A5QDDFRQ1 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 deep expertise in automotive-grade signal conditioning and power management ICs.

The INA190-Q1 product line was engineered specifically for high-accuracy, low-power current sensing in AEC-Q100 automotive systems - emphasizing picoamp input bias, wide common-mode range, and functional safety support for BMS, BCM, and ADAS subsystems.

FAQ

What is the maximum common-mode voltage the INA190A5QDDFRQ1 can withstand?

The INA190A5QDDFRQ1 supports a continuous common-mode input range of –0.2 V to +40 V, with absolute maximum survivability up to +42 V on IN+ and IN– pins. This enables direct connection to automotive 12 V and 48 V battery rails without external attenuation or level-shifting circuitry - a key requirement for high-side sensing in body control modules and telematics units. The device maintains specified performance across its full operating temperature range.

Does the INA190A5QDDFRQ1 support bidirectional current sensing, and how is it implemented?

Yes, the INA190A5QDDFRQ1 supports true bidirectional current sensing via its REF pin. When a reference voltage (e.g., VS/2 = 1.65 V for 3.3 V supply) is applied to REF, positive differential input (IN+ > IN−) produces OUT > VREF, while negative differential input produces OUT < VREF. This architecture eliminates need for external op-amps or polarity-reversal switches - simplifying PCB layout in battery management systems and eCall modules where charge/discharge monitoring is required.

What is the purpose of the ENABLE pin on the INA190A5QDDFRQ1, and how does it affect power consumption?

The ENABLE pin on the INA190A5QDDFRQ1 (available only in the DDF SOT-23-8 package) controls device power state: driven to VS for normal operation (65 µA typical quiescent current), or to GND for shutdown (≤100 nA max supply current). During shutdown, the output enters high-impedance state, isolating downstream circuitry. This feature is essential for duty-cycled current monitoring in telematics control units and emergency call systems where multi-year battery life is mandatory.

How does the 500 V/V gain option of the INA190A5QDDFRQ1 improve measurement resolution in low-current applications?

The 500 V/V fixed gain of the INA190A5QDDFRQ1 converts 2 mV shunt voltage into 1 V output - enabling 10-bit or 12-bit microcontroller ADCs to resolve sub-10 µA currents with standard 100 mΩ sense resistors. Combined with ±15 µV offset and 500 pA input bias, this gain option achieves 30 µA minimum detectable current at room temperature - critical for detecting early-stage battery leakage in automotive body control modules before catastrophic discharge occurs.

Is the INA190A5QDDFRQ1 compatible with both high-side and low-side current sensing topologies?

Yes, the INA190A5QDDFRQ1 supports both high-side and low-side configurations due to its independent –0.2 V to +40 V common-mode input range - unbounded by the 1.7 V to 5.5 V supply voltage. In high-side sensing, IN+ connects to battery rail and IN− to shunt load; in low-side, IN+ connects to shunt load and IN− to ground. This flexibility allows designers to select topology based on noise immunity, ground isolation, or fault detection requirements - without changing the IC or layout.