Texas Instruments INA211AIDCKR

Overview

INA211AIDCKR from Texas Instruments is a precision bidirectional current-shunt monitor with zero-drift architecture, designed for high-side or low-side sensing in power rails up to 26 V. It delivers 500 V/V fixed gain, ±35 µV max offset voltage, 0.5 µV/°C max offset drift, and operates from 2.7 V to 26 V supply while consuming ≤100 µA quiescent current - enabling accurate 10-mV full-scale shunt measurements in notebook battery management circuits.

For engineers reviewing the INA211AIDCKR datasheet, INA211AIDCKR pinout, INA211AIDCKR application, or INA211AIDCKR equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping (SC70-6), real-world application constraints, and two rigorously cross-checked alternative parts for current-sense amplifier selection.

Technical Context

The INA211AIDCKR implements a zero-drift chopper-stabilized amplifier topology to achieve ±35 µV max input offset and 0.5 µV/°C max drift over –40°C to +125°C, supporting precise low-voltage shunt sensing. Its differential input stage accepts common-mode voltages from –0.1 V to 26 V independent of supply voltage, enabling direct measurement on 12-V telecom power buses or 3.3-V embedded system rails.

With 500 V/V fixed gain, 7 kHz bandwidth (C_L = 10 pF), and 0.4 V/µs slew rate, it drives 10-kΩ loads with rail-to-rail output swing (to within 50 mV of V+ and 5 mV of GND). Input bias current remains ≤35 µA across its full common-mode range, minimizing error in high-impedance shunt configurations.

Key Specifications

Pinout & Package

INA211AIDCKR is packaged in a 6-pin SC70 (DCK) package measuring 2.00 mm × 1.25 mm, optimized for space-constrained PCB layouts in portable electronics. Pin functions are validated per TI SBOS437K Rev K (November 2023).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA212AIDCKR and MAX4080TASA+, the INA211AIDCKR offers optimal balance of gain (500 V/V), ultra-low offset, SC70 footprint, and 26-V compliance - making it the preferred choice for space-constrained 12-V/24-V portable and telecom applications requiring 10-mV shunt resolution.

Availability

INA211AIDCKR is available at Aetrix Electronics and suitable for notebook computers, telecom power modules, USB-C PD implementations, and battery management systems requiring stable component supply with guaranteed long-term manufacturability.

Supply support for INA211AIDCKR 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 expertise in precision signal conditioning and power management ICs.

The INA21x series was engineered specifically for high-accuracy, low-drift current sensing in power-constrained and thermally demanding environments - targeting applications in computing, communications, and portable energy systems.

FAQ

What is the maximum common-mode voltage the INA211AIDCKR can measure?

The INA211AIDCKR supports a common-mode input voltage range of –0.1 V to 26 V across its full operating temperature range (–40°C to +125°C). This allows direct high-side sensing on 24-V industrial rails or 12-V automotive subsystems without external level-shifting components. The –0.1 V lower limit enables true bidirectional current detection near ground potential in low-side configurations.

Does the INA211AIDCKR require an external reference voltage?

No - the INA211AIDCKR does not require an external reference voltage to function, but the REF pin must be actively driven. It can be tied to GND for single-ended 0-V to V_OUT output, connected to V+/2 for rail-splitting, or driven by a precision voltage source. Leaving REF floating is invalid; unbuffered resistive dividers degrade CMRR and must be avoided per TI design guidelines.

Can the INA211AIDCKR be used for bidirectional current sensing?

Yes - the INA211AIDCKR supports true bidirectional current sensing. When V_IN+ > V_IN−, the output rises above V_REF; when V_IN− > V_IN+, the output falls below V_REF. This polarity-sensitive behavior enables detection of both charge and discharge currents in battery applications using a single shunt resistor and one INA211AIDCKR device.

What is the purpose of the NC pins in the UQFN variant, and does the INA211AIDCKR have them?

The INA211AIDCKR uses the SC70-6 (DCK) package, which has no NC (no-connect) pins - all six pins are functional (REF, IN−, V+, IN+, GND, OUT). NC pins appear only in the 10-pin UQFN (RSW) variant (pins 1 and 7), where they are internally unconnected and may be left floating or grounded. This distinction is critical: DCK users must utilize all six pins as defined in Table 4-1 of SBOS437K.

How does the 500 V/V gain of the INA211AIDCKR affect shunt resistor selection?

With 500 V/V gain, the INA211AIDCKR converts a 10-mV shunt voltage drop into a 5-V output - ideal for direct interface with 5-V ADCs. For a target full-scale current of 10 A, a 1-mΩ shunt yields 10-mV drop and 5-V output. Lower resistance shunts reduce I²R loss but demand higher ADC resolution to maintain accuracy; higher resistance increases loss but eases noise immunity. TI recommends keeping shunt voltage ≤10 mV for optimal zero-drift performance.