Texas Instruments INA190A2QDDFRQ1

Overview

INA190A2QDDFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive current-sense amplifier optimized for bidirectional microamp-to-amp current monitoring in high-side or low-side configurations. It delivers 50 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 current sensing in BMS and telematics control units.

For engineers reviewing the INA190A2QDDFRQ1 datasheet, INA190A2QDDFRQ1 pinout, INA190A2QDDFRQ1 application, or INA190A2QDDFRQ1 equivalent, key selection criteria include its picoamp input bias current (500 pA typ), enable-controlled shutdown (100 nA max), ±0.3% gain error, rail-to-rail output swing, and DDF 8-pin SOT-23 package with ENABLE functionality.

Technical Context

The INA190A2QDDFRQ1 employs a capacitively coupled front-end architecture that blocks DC common-mode voltages, enabling 132 dB minimum CMRR and operation with input common-mode voltages from –0.2 V to +40 V - independent of its 1.7–5.5 V supply. Its zero-drift topology ensures stable offset performance over temperature (80 nV/°C max drift).

This device supports true bidirectional sensing via the REF pin, where externally applied reference voltage sets the zero-current output level; differential input voltage (IN+–IN–) is amplified by 50 V/V and offset by VREF. The ENABLE pin (DDF package only) places OUT in high-impedance state and reduces supply current to ≤100 nA when driven low.

Key Specifications

Pinout & Package

INA190A2QDDFRQ1 is packaged in an 8-pin thin SOT-23 (DDF) with 1.60 mm × 2.90 mm body size and wettable flank terminations for automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A2QDRQ1 and MAX40010FAUA+, the INA190A2QDDFRQ1 uniquely combines picoamp input bias, ENABLE functionality, bidirectional sensing, and AEC-Q100 Grade 1 operation - making it the only option for low-power, fault-tolerant automotive current monitoring requiring microamp resolution and zero-crossing detection.

Availability

INA190A2QDDFRQ1 is available at Aetrix Electronics and suitable for battery management systems, telematics control units, and emergency call modules requiring stable component supply across automotive production lifecycles.

Supply support for INA190A2QDDFRQ1 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 automotive-grade product development and AEC-Q100 validation expertise.

The INA190-Q1 product line is engineered specifically for high-precision, low-power current sensing in automotive subsystems - targeting applications where microamp-level accuracy, wide common-mode range, and functional safety compliance are mandatory.

FAQ

What is the maximum common-mode voltage the INA190A2QDDFRQ1 can withstand?

The INA190A2QDDFRQ1 supports a continuous common-mode input voltage range of –0.2 V to +40 V, with absolute maximum survivability up to +42 V on IN+ and IN– pins. This allows direct connection to 12-V automotive battery rails in high-side configurations without external level-shifting circuitry, and remains fully operational during ISO 7637-2 load-dump transients.

Does the INA190A2QDDFRQ1 support bidirectional current sensing, and how is it implemented?

Yes, the INA190A2QDDFRQ1 supports bidirectional current sensing via its REF pin. When a reference voltage (e.g., 2.5 V) is applied to REF, the output becomes VOUT = 50 × (IN+ − IN−) + VREF. A positive differential input yields VOUT > VREF; a negative differential yields VOUT < VREF - enabling single-supply detection of charge and discharge currents in battery systems without polarity-reversal circuitry.

What is the purpose of the ENABLE pin on the INA190A2QDDFRQ1, and what happens when it is grounded?

The ENABLE pin on the INA190A2QDDFRQ1 (available only in the DDF SOT-23 package) controls device power state. When driven to VS, the amplifier operates normally with 50 µA typical quiescent current. When pulled to GND, the device enters shutdown mode: supply current drops to ≤100 nA, and the OUT pin transitions to high-impedance - preserving signal integrity and minimizing power loss in always-on automotive modules like eCall subsystems.

How does the 500 pA typical input bias current of the INA190A2QDDFRQ1 improve system-level accuracy?

The 500 pA typical input bias current of the INA190A2QDDFRQ1 minimizes error introduced by current flowing through the sense resistor itself - especially critical when using high-value shunts (>1 kΩ) for microamp-range measurements. It also enables effective RC filtering at the inputs without degrading DC accuracy, unlike conventional current-sense amplifiers with nanoamp-level bias currents that distort filter time constants and introduce gain errors.

What packaging and thermal characteristics define the INA190A2QDDFRQ1's suitability for automotive under-hood applications?

The INA190A2QDDFRQ1 uses the DDF 8-pin thin SOT-23 package (1.60 mm × 2.90 mm) with wettable flanks, qualified to AEC-Q100 Grade 1 (–40°C to +125°C). Its junction-to-board thermal resistance is 84.3°C/W, and it features 164.6°C/W junction-to-ambient rating - enabling reliable operation in compact, thermally constrained automotive ECUs without forced airflow or heatsinking, even at full 125°C ambient.