Texas Instruments INA211CIDCKT

Overview

INA211CIDCKT from Texas Instruments is a precision current-sense amplifier optimized for inline motor-control current sensing, featuring 80-dB CMRR at 50 kHz, ±0.5% gain error (max), and 120-ns propagation delay. It operates from a 2.7-V to 26-V supply, supports common-mode voltages up to +26 V, and delivers rail-to-rail output swing. It is used in three-phase BLDC motor control feedback loops to enable accurate phase-current measurement under high dV/dt PWM switching.

For engineers reviewing the INA211CIDCKT datasheet, INA211CIDCKT pinout, INA211CIDCKT application, or INA211CIDCKT equivalent, key selection criteria include its 80-dB CMRR at 50 kHz, ±0.5% max gain error over temperature, 120-ns propagation delay, 2.7-V to 26-V supply range, and ability to reject fast common-mode transients in inline shunt configurations.

Technical Context

The INA211CIDCKT employs a proprietary zero-drift chopper-stabilized architecture with enhanced PWM rejection, enabling stable differential amplification while suppressing common-mode transients up to 40 V with 10-ns edge rates. Its input stage is designed for high-speed settling (<150 ns) and low offset drift (±0.1 µV/°C).

Unlike standard current-sense amplifiers, the INA211CIDCKT integrates matched internal resistors for fixed 20-V/V gain, eliminating external resistor matching errors and reducing PCB layout sensitivity to parasitic coupling in high-noise motor-drive environments.

Key Specifications

Pinout & Package

The INA211CIDCKT is housed in a 6-pin SC70 (DCK) package with 0.65-mm pitch, optimized for space-constrained motor-control PCBs and thermally efficient shunt placement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1IDR and MAX40016AUT+T, the INA211CIDCKT uniquely balances SC70-6 size, ±0.5% gain error, 120-ns latency, and 80-dB CMRR at 50 kHz-making it optimal for compact, high-fidelity 24-V motor-control designs where board area and PWM fidelity are co-constrained.

Availability

INA211CIDCKT is available at Aetrix Electronics and suitable for industrial servo drives, electric power steering modules, and robotics joint controllers requiring stable component supply and guaranteed long-term manufacturability.

Supply support for INA211CIDCKT 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, specializing in analog, embedded processing, and digital signal technologies for industrial, automotive, and communications markets.

The INA211CIDCKT belongs to TI's precision current-sense amplifier product line, engineered specifically for high-fidelity inline current measurement in PWM-driven motor-control systems where common-mode transient rejection and gain stability are critical.

FAQ

What is the maximum common-mode voltage the INA211CIDCKT can handle?

The INA211CIDCKT supports an input common-mode voltage range from –0.3 V to +26 V. This allows direct connection to shunt resistors placed on the high-side of motor phase legs in 24-V industrial inverters. Operation beyond +26 V common-mode is not supported and may cause permanent damage to the INA211CIDCKT.

Does the INA211CIDCKT require external gain-setting resistors?

No, the INA211CIDCKT features a factory-trimmed fixed gain of 20 V/V. This eliminates external resistor matching, layout sensitivity, and thermal drift errors associated with discrete gain networks. The internal precision resistor network ensures ±0.5% gain error over temperature-no external components are needed for basic operation of the INA211CIDCKT.

Can the INA211CIDCKT be used in automotive EPS systems?

Yes, the INA211CIDCKT is qualified for automotive-grade temperature range (–40°C to +125°C) and supports common-mode transients typical of 12-V EPS H-bridges. Its 80-dB CMRR at 50 kHz and 120-ns propagation delay meet functional requirements for torque-loop feedback in ASIL-B–level EPS subsystems when paired with appropriate system-level fault handling-verified in INA211CIDCKT reference designs.

What is the purpose of the REF pin on the INA211CIDCKT?

The REF pin on the INA211CIDCKT sets the output voltage baseline, allowing level-shifting of the amplified signal. For example, tying REF to 1.65 V enables bipolar output swing (0–3.3 V) for 3.3-V ADCs. This flexibility avoids external op-amp level-shift stages and preserves signal integrity-especially valuable in noise-sensitive motor-control applications using the INA211CIDCKT.

How does the INA211CIDCKT compare to the INA240 in terms of PWM rejection?

The INA211CIDCKT and INA240 both target PWM-heavy motor applications, but the INA240 offers higher CMRR (120 dB vs. 80 dB) and wider common-mode range (–4 V to +80 V). The INA211CIDCKT prioritizes compact SC70-6 packaging and tighter gain error (±0.5% vs. ±1%) at lower cost-making it preferred for space-constrained 24-V systems where +26 V common-mode suffices and the INA211CIDCKT's 120-ns latency meets loop timing.