Texas Instruments INA199B1QDCKRQ1

Overview

INA199B1QDCKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive current-sense amplifier with bidirectional capability, zero-drift architecture, and fixed 50 V/V gain. It operates from 2.7 V to 26 V supply, supports common-mode input range from –0.1 V to 26 V, delivers ±150 μV max offset voltage, and achieves ±1.5% max gain error over –40°C to +125°C - enabling precise low-side or high-side shunt monitoring in brake systems and body control modules.

For engineers reviewing the INA199B1QDCKRQ1 datasheet, INA199B1QDCKRQ1 pinout, INA199B1QDCKRQ1 application, or INA199B1QDCKRQ1 equivalent, this page provides verified functional context, validated pin-level design meaning, confirmed automotive-grade performance boundaries, and real-world alternative selection guidance for safety-critical current sensing.

Technical Context

The INA199B1QDCKRQ1 implements a zero-drift chopper-stabilized topology to maintain ±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 voltage, supporting both low-side and high-side configurations without external level-shifting circuitry.

It features a factory-trimmed 50 V/V gain set by internal 20-kΩ resistors (R3/R4), delivers 80-kHz bandwidth, and maintains output swing within 50 mV of rails at 10-kΩ load. Quiescent current remains ≤100 μA, enabling always-on monitoring in power-constrained automotive subsystems.

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 INA240A1QDRQ1 and MAX40056ATA+T, the INA199B1QDCKRQ1 offers optimal balance of automotive qualification, fixed-gain simplicity, ultra-low power, and proven integration in cost-sensitive body electronics - making it the preferred choice for production-grade brake, seat, and window modules where layout efficiency and qualification traceability are critical.

Availability

INA199B1QDCKRQ1 is available at Aetrix Electronics and suitable for brake systems, power seats, and body control modules requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.

Supply support for INA199B1QDCKRQ1 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 specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and power management ICs.

The INA199-Q1 product line was designed specifically for high-accuracy, low-power current sensing in automotive body electronics - targeting applications where zero-drift performance, AEC-Q100 qualification, and small SC70 packaging are mandatory.

FAQ

What is the maximum common-mode voltage the INA199B1QDCKRQ1 can handle?

The INA199B1QDCKRQ1 supports a common-mode input voltage range of –0.1 V to 26 V. This specification is validated across the full operating temperature range (–40°C to +125°C) and enables direct connection to 12-V and 24-V automotive battery rails without external attenuation. Sustained operation above 26 V may cause permanent damage per TI's absolute maximum ratings.

Does the INA199B1QDCKRQ1 support bidirectional current sensing?

Yes, the INA199B1QDCKRQ1 supports bidirectional current sensing through its differential input architecture (IN+ and IN–). When the REF pin is biased at mid-supply (e.g., V+/2), the output voltage centers at that reference, allowing positive and negative shunt voltage drops to produce corresponding above- and below-reference outputs - essential for reversible motor control in power seats and electric windows.

What is the gain configuration of the INA199B1QDCKRQ1?

The INA199B1QDCKRQ1 has a factory-trimmed fixed gain of 50 V/V, implemented using internal 20-kΩ precision resistors (R3/R4). This eliminates external gain-setting components, reduces layout sensitivity, and ensures ±1.5% max gain error over temperature - making it ideal for production systems where calibration overhead and component count must be minimized.

Can the INA199B1QDCKRQ1 be used in high-side or low-side shunt configurations?

Yes, the INA199B1QDCKRQ1 is explicitly designed for both high-side and low-side current sensing. Its wide –0.1 V to 26 V common-mode range and rail-to-rail output swing allow direct connection to either side of the shunt resistor. In high-side use, IN+ connects to battery rail and IN– to shunt output; in low-side use, IN+ connects to shunt output and IN– to ground - no reconfiguration required.

Is the INA199B1QDCKRQ1 qualified for automotive applications?

Yes, the INA199B1QDCKRQ1 is AEC-Q100 qualified for automotive applications (Grade 1: –40°C to +125°C ambient temperature). It also includes functional safety documentation to support ISO 26262 system-level development, and is packaged in a moisture-sensitive, Pb-free SC70-6 package compliant with automotive reflow profiles and long-term reliability requirements.