Texas Instruments INA190A1QDDFRQ1

Overview

INA190A1QDDFRQ1 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 25 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 precision battery management and eCall system current supervision.

For engineers reviewing the INA190A1QDDFRQ1 datasheet, INA190A1QDDFRQ1 pinout, INA190A1QDDFRQ1 application, or INA190A1QDDFRQ1 equivalent, key selection criteria include picoamp input bias (500 pA typ), ENABLE-controlled shutdown (100 nA max), ±0.2% gain error, 40-V common-mode range with 42-V survivability, and SOT-23-8 DDF package compatibility with automotive layout constraints.

Technical Context

The INA190A1QDDFRQ1 employs a capacitively coupled front-end architecture to achieve ultra-low input bias current and high DC common-mode rejection (132 dB min). Its zero-drift design maintains offset stability over temperature (80 nV/°C max), while the integrated ENABLE pin enables deterministic power cycling without external circuitry.

This device supports true bidirectional sensing via externally applied REF voltage, allowing output swing above and below reference level. It functions independently of supply voltage across its full –0.2 V to +40 V common-mode range, making it suitable for direct connection to 12-V automotive bus rails with transient tolerance up to 42 V.

Key Specifications

Pinout & Package

INA190A1QDDFRQ1 is packaged in an 8-pin thin SOT-23 (DDF) with 1.60 mm × 2.90 mm body size, optimized for space-constrained automotive PCBs and thermally robust mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and MAX40056ATA+T, the INA190A1QDDFRQ1 uniquely balances picoamp input bias, ENABLE-controlled ultra-low shutdown current, AEC-Q100 Grade 1 compliance, and 42-V fault tolerance - making it the only option meeting all four requirements for automotive battery monitoring and eCall subsystems.

Availability

INA190A1QDDFRQ1 is available at Aetrix Electronics and suitable for body control modules, telematics units, emergency call systems, battery management subsystems, and automotive head units requiring stable component supply across extended production lifecycles.

Supply support for INA190A1QDDFRQ1 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 designed specifically for high-accuracy, low-power current sensing in AEC-Q100-compliant automotive subsystems - emphasizing picoamp bias, wide common-mode operation, and functional safety readiness.

FAQ

What is the maximum common-mode voltage the INA190A1QDDFRQ1 can withstand without damage?

The INA190A1QDDFRQ1 has an absolute maximum common-mode voltage rating of 42 V, meaning it can survive automotive load-dump transients and jump-start events up to this level without permanent damage or parametric shift. Its operational common-mode range remains –0.2 V to +40 V under normal conditions, independent of supply voltage.

Does the INA190A1QDDFRQ1 support bidirectional current sensing, and how is it implemented?

Yes, the INA190A1QDDFRQ1 supports bidirectional current sensing through its dedicated REF pin. Applying a mid-supply voltage (e.g., VS/2) to REF centers the output at that level; positive differential input produces output above REF, and negative differential input produces output below REF. This enables single-supply detection of charge/discharge currents in battery systems.

What is the significance of the ENABLE pin on the INA190A1QDDFRQ1, and how does it affect power consumption?

The ENABLE pin on the INA190A1QDDFRQ1 provides hardware-controlled power gating: driving it low places the device in shutdown mode with ≤100 nA supply current and high-impedance output. This feature is essential for ultra-low-power applications like eCall backup monitoring, where periodic wake-up current sampling must minimize average system drain.

How does the 500 pA typical input bias current of the INA190A1QDDFRQ1 improve measurement accuracy in low-current applications?

The 500 pA typical input bias current of the INA190A1QDDFRQ1 minimizes error introduced by current flowing through the sense resistor itself - especially critical when using high-value resistors (e.g., 100 Ω) to resolve sub-microamp currents. It eliminates the need for complex bias compensation networks and preserves accuracy even at 1 µA load levels.

Is the INA190A1QDDFRQ1 pin-compatible with other devices in the INA190-Q1 family, such as the A2 or A3 variants?

Yes, all INA190-Q1 variants - including INA190A1QDDFRQ1, INA190A2QDDFRQ1, and INA190A3QDDFRQ1 - share identical 8-pin SOT-23 (DDF) packaging and pinout. Gain is factory-set and non-adjustable, so swapping between variants requires only firmware gain-scaling updates and no PCB redesign.