Texas Instruments INA194AQDBVRQ1

Overview

INA194AQDBVRQ1 from Texas Instruments is an automotive-grade current shunt monitor IC with voltage output, designed for high-side and low-side bidirectional current sensing in systems with common-mode voltages from –16 V to +80 V. It delivers 50 V/V gain, ±2% total output error over temperature, 300 kHz bandwidth, and operates from a single 2.7–18 V supply. It is used in HEV/EV powertrain battery monitoring and body control modules where wide common-mode range and functional safety support are required.

For engineers reviewing the INA194AQDBVRQ1 datasheet, INA194AQDBVRQ1 pinout, INA194AQDBVRQ1 application, or INA194AQDBVRQ1 equivalent, this page provides verified technical context, validated pin functions, confirmed automotive operating conditions (–40°C to 125°C), real-world accuracy behavior across V_SENSE and V_CM regions, and two documented alternative parts with explicit functional and application differences.

Technical Context

The INA194AQDBVRQ1 uses a patented dual-amplifier front-end architecture that converts differential input voltage into a current through an internal 5 kΩ resistor, enabling –16 V to +80 V common-mode operation independent of supply voltage. Its 50 V/V fixed gain is implemented via precision internal resistors and buffered output stage.

It supports bidirectional current sensing in both positive and negative common-mode regimes: amplifier A2 dominates above V_S, A1 activates below 0 V, with seamless transition between modes. Input bias current remains within ±23 μA across full common-mode range, and output swing reaches within 200 mV of V+ and 50 mV above GND under 100 kΩ load.

Key Specifications

Pinout & Package

INA194AQDBVRQ1 is housed in a 5-pin SOT-23 (DBV) package, measuring 2.90 mm × 1.60 mm, optimized for space-constrained automotive PCB layouts and thermal performance (R_θJA = 221.7°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current sensing applications.

Compared with INA194AIDBVR, the INA194AQDBVRQ1 adds AEC-Q100 qualification, extended temperature support, and functional safety artifacts-justifying its use in automotive powertrain. Compared with MAX40056ATA+T, it trades bandwidth for guaranteed –16 V to +80 V operation and integrated 50 V/V gain, simplifying design in high-voltage battery systems.

Availability

INA194AQDBVRQ1 is available at Aetrix Electronics and suitable for HEV/EV powertrain, body control modules, and telecom power shelf designs requiring stable component supply, long-term automotive lifecycle support, and traceable sourcing.

Supply support for INA194AQDBVRQ1 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 solutions.

The INA19xA-Q1 product line was developed specifically for robust, high-accuracy current sensing in automotive power systems-including battery management, motor control, and load diagnostics-where wide common-mode range and functional safety compliance are mandatory.

FAQ

What is the exact gain and tolerance of INA194AQDBVRQ1?

The INA194AQDBVRQ1 has a nominal gain of 50 V/V, with ±1% gain error at 25°C and ±2% over the full –40°C to +125°C operating range. This is a factory-trimmed, fixed-ratio transfer function; no external resistors are required to set gain, and the value is specified in Section 6.5 of the SBOS366E datasheet.

Does INA194AQDBVRQ1 support bidirectional current sensing?

Yes, the INA194AQDBVRQ1 supports bidirectional current sensing across its full –16 V to +80 V common-mode range. When current flows in either direction across the shunt, the output voltage changes polarity relative to mid-supply-enabling detection of charge/discharge states in battery systems without additional circuitry.

What is the minimum shunt voltage required for accurate measurement with INA194AQDBVRQ1?

For guaranteed accuracy per datasheet specifications, the INA194AQDBVRQ1 requires V_SENSE ≥ 20 mV. Below 20 mV, output error increases significantly-especially in the 0 V ≤ V_CM ≤ V_S region-where V_OUT may deviate up to 1 V from ideal. For low-current applications, select INA195AQDBVRQ1 (100 V/V) to improve resolution.

Can INA194AQDBVRQ1 operate with V+ = 3.3 V while measuring an 80-V bus?

Yes. The INA194AQDBVRQ1's input stage is fully isolated from its supply rail: V+ may be 3.3 V while VIN+ and VIN– sit at +80 V or –16 V. However, the output voltage swing is constrained by V+, so with V+ = 3.3 V, V_OUT ranges from ~50 mV to ~3.1 V-requiring compatible ADC input range.

Is INA194AQDBVRQ1 pin-compatible with other devices in the INA19xA-Q1 family?

No. The INA194AQDBVRQ1 belongs to the INA193A–INA195A pinout group (VIN+ on Pin 3, VIN– on Pin 4), which differs from the INA196A–INA198A group (VIN+ on Pin 4, VIN– on Pin 5). Swapping packages without layout revision will cause incorrect connections and measurement failure.