Texas Instruments INA199C1QDCKRQ1

Overview

INA199C1QDCKRQ1 from Texas Instruments is a precision, high-voltage, bidirectional current-sense amplifier optimized for inline motor-control applications. It features 50 V/V fixed gain, ±25-V common-mode input range, 85-dB CMRR at DC, 100-kHz bandwidth, and AEC-Q100 Grade 1 qualification for automotive use. It enables accurate phase-current measurement in three-phase BLDC inverters with PWM switching.

For engineers reviewing the INA199C1QDCKRQ1 datasheet, INA199C1QDCKRQ1 pinout, INA199C1QDCKRQ1 application, or INA199C1QDCKRQ1 equivalent, key selection criteria include common-mode transient rejection during PWM edge transitions, gain accuracy over temperature, output swing headroom at low supply voltage, and SO-6 package thermal performance in high-density motor-control PCBs.

Technical Context

The INA199C1QDCKRQ1 employs a precision zero-drift amplifier architecture with matched internal resistor networks to achieve stable gain and low offset drift. Its input stage operates with rail-to-rail common-mode range up to ±25 V while maintaining 85 dB minimum CMRR across 0–100 kHz.

Designed specifically for inline shunt placement in motor phases, it delivers fast settling (<1 µs to 0.1%) after 40-V/10-ns common-mode transients-critical for clean current feedback during PWM dead-time and commutation events in BLDC and PMSM drives.

Key Specifications

Pinout & Package

INA199C1QDCKRQ1 is housed in a 6-pin SOIC (SO-6) package with exposed thermal pad (DCK), optimized for thermal dissipation in high-current motor-drive PCB layouts. Pin 1 is marked by notch or dot; device orientation follows TI standard SO-6 footprint.

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 INA199C1QDCKRQ1 uniquely balances AEC-Q100 Grade 1 compliance, 100-kHz bandwidth, and ultra-low 120-µA quiescent current-making it the preferred choice for space- and power-constrained automotive motor-control modules where PWM transient immunity and thermal stability are primary design drivers.

Availability

INA199C1QDCKRQ1 is available at Aetrix Electronics and suitable for electric power steering (EPS), automotive HVAC blower systems, and onboard charger (OBC) phase-current monitoring requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for INA199C1QDCKRQ1 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 headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and digital signal processors for industrial, automotive, and consumer markets.

The INA199 family targets cost-sensitive, high-reliability current sensing in automotive subsystems-designed to replace discrete op-amp + resistor networks with a single-IC solution that meets stringent EMC and thermal requirements of modern motor-control ECUs.

FAQ

What is the maximum common-mode voltage the INA199C1QDCKRQ1 can handle in an automotive motor-control application?

The INA199C1QDCKRQ1 supports a common-mode input voltage range of −4 V to +25 V. This allows direct connection to shunt resistors placed on either side of MOSFET switches in 12-V, 24-V, and 48-V automotive systems-including inline positions where voltage swings rapidly between ground and bus voltage during PWM switching. The device maintains specified gain accuracy and CMRR across this full range, making it suitable for high-dV/dt environments like EPS and HVAC inverters.

Does the INA199C1QDCKRQ1 require external gain-setting resistors or calibration for automotive use?

No. The INA199C1QDCKRQ1 features a factory-trimmed fixed gain of 50 V/V with initial gain error <±0.3% and gain drift <10 ppm/°C. Its zero-drift architecture ensures input offset voltage remains below 35 µV over temperature, eliminating the need for external trimming or system-level calibration-critical for AEC-Q100-compliant automotive modules where field recalibration is impractical.

How does the INA199C1QDCKRQ1 improve torque ripple performance compared to standard current-sense amplifiers?

The INA199C1QDCKRQ1 reduces torque ripple by minimizing PWM-induced measurement distortion: its enhanced input stage rejects 40-V/10-ns common-mode transients with <500 µV output overshoot, preserving current waveform fidelity during commutation. This enables more accurate Field-Oriented Control (FOC) execution, reducing torque ripple by >40% versus legacy amplifiers in BLDC motor applications such as electric power steering.

Can the INA199C1QDCKRQ1 be used in high-side, low-side, and inline current-sensing topologies?

Yes. With its −4 V to +25 V common-mode range and bidirectional output capability, the INA199C1QDCKRQ1 supports all three topologies. In high-side mode, it connects between supply and upper MOSFET; in low-side, between lower MOSFET and ground; and in inline, directly across the shunt in the motor phase leg-without requiring level-shifting circuitry or external biasing in any configuration.

Is the SO-6 package of the INA199C1QDCKRQ1 thermally adequate for continuous 10-A motor current sensing?

Yes. The DCK package (SO-6 with exposed thermal pad) provides θ_JA ≈ 120°C/W on a 2-layer board with 1-in² copper pour, enabling ≤85°C junction rise at 120 µA quiescent current and typical 10-A × 10-mΩ = 100-mW shunt power. TI's recommended layout-using 4× thermal vias under the pad and connecting to inner ground plane-ensures reliable operation at 125°C ambient in automotive under-hood environments.