Texas Instruments INA199B3QDCKRQ1

Overview

INA199B3QDCKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive current-sense amplifier with zero-drift architecture, 200 V/V fixed gain, ±150 μV max offset voltage, and –0.1 V to 26 V common-mode input range. It operates from 2.7 V to 26 V supply, draws ≤100 μA quiescent current, and supports bidirectional low-side or high-side shunt monitoring in body control modules and brake systems.

For engineers reviewing the INA199B3QDCKRQ1 datasheet, INA199B3QDCKRQ1 pinout, INA199B3QDCKRQ1 application, or INA199B3QDCKRQ1 equivalent, key selection criteria include its 200 V/V gain accuracy (±1.5% over –40°C to +125°C), 0.5 μV/°C max offset drift, SC70-6 package footprint, and functional safety documentation support for ISO 26262 ASIL-B–capable designs.

Technical Context

The INA199B3QDCKRQ1 implements a zero-drift chopper-stabilized topology to achieve ±150 μV max input offset and 0.5 μV/°C max drift across –40°C to +125°C. Its differential input stage rejects common-mode voltages up to 26 V independent of supply, enabling direct sensing on 12-V or 24-V automotive rails.

With fixed 200 V/V gain set by internal 5-kΩ/1-MΩ resistor network, it delivers 14 kHz bandwidth and 0.4 V/μs slew rate while maintaining 100 dB min CMRR and ±1.5% gain error over temperature. The REF pin allows output level shifting for single-supply ADC interfacing without external op-amps.

Key Specifications

Pinout & Package

Package: 6-pin SC70 (2.00 mm × 1.25 mm body size), surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA199B3QDCKRQ1, INA240A3QDRQ1 offers better offset but reduced common-mode range, while MAX40056ATA+T extends voltage rating but omits AEC-Q100 and functional safety support-making INA199B3QDCKRQ1 the only option qualified for ASIL-B–rated automotive body electronics.

Availability

INA199B3QDCKRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, brake system ECUs, and electric window actuators requiring stable component supply with guaranteed long-term availability and AEC-Q100 compliance.

Supply support for INA199B3QDCKRQ1 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 IC design expertise and broad AEC-Q100 product portfolio.

The INA199-Q1 product line was designed specifically for high-precision, low-power current sensing in automotive body electronics-including mirrors, seats, brakes, and HVAC-where zero-drift performance and functional safety support are mandatory.

FAQ

What is the maximum common-mode voltage supported by the INA199B3QDCKRQ1?

The INA199B3QDCKRQ1 supports a common-mode input voltage range of –0.1 V to 26 V, enabling direct connection to 12-V or 24-V automotive battery rails in either high-side or low-side configurations. This specification is guaranteed over the full –40°C to +125°C operating temperature range and is independent of the 2.7-V to 26-V supply voltage applied to the V+ pin. Sustained operation above 26 V may cause permanent damage.

Does the INA199B3QDCKRQ1 require external calibration for offset or gain errors?

No, the INA199B3QDCKRQ1 does not require external calibration. Its zero-drift architecture ensures ±150 μV maximum input offset and 0.5 μV/°C maximum offset drift across –40°C to +125°C, while the fixed 200 V/V gain has ±1.5% maximum error over temperature. These specifications are factory-tested and guaranteed, eliminating need for system-level trimming or software compensation in production automotive applications.

Can the INA199B3QDCKRQ1 be used in bidirectional current sensing applications?

Yes, the INA199B3QDCKRQ1 supports bidirectional current sensing. By connecting the REF pin to mid-supply (e.g., V+/2), the output swings symmetrically around that reference voltage-producing positive voltage for current in one direction and negative relative to REF for reverse current. This configuration enables accurate measurement of motor direction and regenerative braking current in applications like power seats and EGR valves.

What is the purpose of the REF pin on the INA199B3QDCKRQ1?

The REF pin on the INA199B3QDCKRQ1 sets the output common-mode voltage level. When grounded, it produces a unipolar 0-V to (V+)–0.2-V output; when tied to V+/2, it yields a bipolar output centered at V+/2, enabling bidirectional current sensing. It also serves as a high-impedance reference point for differential ADC sampling, allowing cancellation of REF-path impedance effects when both OUT and REF are digitized.

Is functional safety documentation available for the INA199B3QDCKRQ1?

Yes, functional safety documentation is available for the INA199B3QDCKRQ1. Texas Instruments provides a functional safety FIT report, failure mode effects and diagnostic analysis (FMEDA), and safety manual supporting ISO 26262 ASIL-B system-level development. This documentation aids in integrating the INA199B3QDCKRQ1 into safety-critical automotive subsystems such as brake control and seat occupancy detection.