Texas Instruments INA199B2QDCKRQ1

Overview

INA199B2QDCKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40°C to +125°C) bidirectional current-shunt monitor with zero-drift architecture, 100 V/V fixed gain, ±150 μV max offset voltage, and –0.1 V to 26 V common-mode input range - enabling precise low-side or high-side sensing in automotive body control modules and brake systems.

For engineers reviewing the INA199B2QDCKRQ1 datasheet, INA199B2QDCKRQ1 pinout, INA199B2QDCKRQ1 application, or INA199B2QDCKRQ1 equivalent, key selection criteria include its 100 V/V gain accuracy (±1.5% over temperature), 0.5 μV/°C max offset drift, 100 μA max quiescent current, and SC70-6 package compatibility with space-constrained automotive PCB layouts.

Technical Context

The INA199B2QDCKRQ1 implements a zero-drift chopper-stabilized amplifier topology to achieve ultra-low offset and drift, supporting accurate current measurement with as little as 10-mV full-scale shunt voltage drop. Its differential input stage operates independently of supply voltage, allowing common-mode voltages up to 26 V while powered from as low as 2.7 V.

It features a fixed 100 V/V gain set by internal 10-kΩ/1-MΩ resistor ratio (R3/R1), delivers rail-to-rail output swing (within 50 mV of V+ and 5 mV of GND), and maintains 100 dB minimum CMRR across –40°C to +125°C - critical for rejecting noise in high-dV/dt automotive power domains.

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 INA199B2QDCKRQ1, INA240A1QDRQ1 trades 26-V high-side capability for better EMI immunity and lower offset in 12-V domains, while MAX40016ATA+T extends common-mode tolerance beyond 26 V but lacks AEC-Q100 validation - making INA199B2QDCKRQ1 the only qualified solution for production automotive body electronics requiring both voltage range and functional safety compliance.

Availability

INA199B2QDCKRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, brake system actuators, and electric window anti-pinch circuits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for INA199B2QDCKRQ1 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 company delivering analog and embedded processing solutions for automotive, industrial, and personal electronics markets.

The INA199-Q1 product line was designed specifically for AEC-Q100-compliant automotive current sensing - targeting high-accuracy, low-power, and high-common-mode monitoring in body electronics, chassis systems, and electrified powertrain subsystems.

FAQ

What is the maximum common-mode voltage supported by the INA199B2QDCKRQ1?

The INA199B2QDCKRQ1 supports a common-mode input voltage range of –0.1 V to 26 V, independent of its supply voltage. This allows direct high-side sensing on 12-V or 24-V automotive battery rails. Operation above 26 V risks permanent damage, per Absolute Maximum Ratings - sustained exposure between 26 V and 28 V is not recommended. The INA199B2QDCKRQ1 achieves this using a proprietary zero-drift input stage that isolates common-mode handling from supply constraints.

How does the REF pin function in the INA199B2QDCKRQ1?

The REF pin on the INA199B2QDCKRQ1 sets the output common-mode voltage and enables bidirectional current sensing. When biased at mid-supply (e.g., V+/2), the output swings symmetrically above and below REF - positive current yields OUT > REF, negative current yields OUT < REF. This eliminates need for dual-supply operation. The INA199B2QDCKRQ1's REF input impedance is high (>1 MΩ), but external impedance here degrades CMRR; buffering with an op-amp is recommended if driven through resistive dividers.

Is the INA199B2QDCKRQ1 pin-compatible with other variants in the INA199-Q1 family?

Yes - all INA199-Q1 variants (including INA199B1QDCKRQ1, INA199B2QDCKRQ1, and INA199B3QDCKRQ1) share identical 6-pin SC70 packaging and pinout. Gain is factory-set by internal resistor ratios (20 kΩ/1 MΩ for 50 V/V, 10 kΩ/1 MΩ for 100 V/V, 5 kΩ/1 MΩ for 200 V/V), so no layout change is needed when selecting different gain versions. The INA199B2QDCKRQ1 uses the 100 V/V configuration, matching Pin 1 (REF) to Pin 2 (GND) to Pin 3 (V+) to Pin 4 (IN+) to Pin 5 (IN–) to Pin 6 (OUT) across all variants.

What is the gain error specification for the INA199B2QDCKRQ1 over temperature?

The INA199B2QDCKRQ1 has a maximum gain error of ±1.5% over the full operating temperature range of –40°C to +125°C. This B-version specification is tighter than the C-version (±1%) but looser than the A-version (±0.5%), balancing cost and performance for mainstream automotive applications. Gain drift is limited to 10 ppm/°C, contributing less than 0.13% error over the full temperature span - ensuring stable calibration in under-hood environments without frequent MCU recalibration.

Does the INA199B2QDCKRQ1 support functional safety compliance?

Yes - the INA199B2QDCKRQ1 is explicitly labeled "Functional Safety-Capable" in its official documentation, with safety-related documentation (FIT rate, failure mode analysis, and diagnostic coverage guidance) available from Texas Instruments to support ISO 26262 ASIL-B system development. While the device itself is not ASIL-certified, its design and characterization data enable integration into ASIL-B compliant architectures - for example, in brake-by-wire or seat motor control where redundant current sensing is used for fault detection. The INA199B2QDCKRQ1's AEC-Q100 Grade 1 qualification is foundational to this capability.