Texas Instruments INA211BIDCKT

Overview

INA211BIDCKT from Texas Instruments is a voltage-output, bidirectional current-shunt monitor with zero-drift architecture, designed for high-accuracy low- or high-side current sensing in power rails up to 26 V. It features a fixed gain of 500 V/V, ±35 µV maximum offset voltage at 25°C, 0.5 µV/°C max offset drift over –40°C to +125°C, and operates from 2.7 V to 26 V supply with ≤100 µA quiescent current. It enables precise measurement of shunt voltage drops as low as 10 mV full-scale in battery chargers and telecom power management systems.

For engineers reviewing the INA211BIDCKT datasheet, INA211BIDCKT pinout, INA211BIDCKT application, or INA211BIDCKT equivalent, this page delivers verified specifications, SC70-6 package layout, functional role in closed-loop current feedback, and validated alternative parts for design flexibility under thermal, common-mode, and accuracy constraints.

Technical Context

The INA211BIDCKT implements a precision zero-drift chopper-stabilized amplifier topology that rejects input offset drift across temperature and time, enabling stable 10-mV full-scale current sensing. Its differential input stage supports common-mode voltages from –0.1 V to 26 V independent of supply voltage, with 105–140 dB CMRR and 7 kHz small-signal bandwidth (C_L = 10 pF).

It uses an internal matched resistor network (R₃ = R₄ = 2 kΩ) to set its 500 V/V gain, referenced to the externally applied REF pin voltage. The output swings within 50 mV of V+ and 5 mV of GND under 10-kΩ load, supporting direct interfacing with 12-bit+ ADCs without level-shifting.

Key Specifications

Pinout & Package

INA211BIDCKT is packaged in a 6-pin SC70 (DCK) package measuring 2.00 mm × 1.25 mm, optimized for space-constrained PCB layouts in portable and telecom equipment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA212BIDCKT and INA213BIDCKT, the INA211BIDCKT offers optimal balance of resolution (500× gain), thermal stability (0.5 µV/°C drift), and bandwidth (7 kHz) for mid-range current sensing in space-constrained, thermally demanding applications like telecom PSUs and notebook power rails.

Availability

INA211BIDCKT is available at Aetrix Electronics and suitable for battery charger monitoring, telecom power supply feedback, notebook system power management, and industrial PLC I/O module protection requiring stable component supply across extended temperature and voltage ranges.

Supply support for INA211BIDCKT 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 product line was engineered specifically for high-accuracy, low-power current sensing in battery-powered, telecom, and industrial systems-emphasizing zero-drift performance, wide common-mode operation, and compact packaging.

FAQ

What is the maximum common-mode voltage supported by the INA211BIDCKT?

The INA211BIDCKT supports a common-mode input voltage range of –0.1 V to 26 V across its –40°C to +125°C operating temperature range. This specification applies to Versions B and C (the 'B' suffix in INA211BIDCKT confirms Version B), enabling reliable high-side sensing on 24-V industrial buses while powered from lower-voltage rails such as 3.3 V or 5 V. The device maintains specified accuracy throughout this range without requiring level-shifting circuitry.

Does the INA211BIDCKT require external components for basic operation?

Yes-the INA211BIDCKT requires a minimum 0.1-µF ceramic bypass capacitor between V+ and GND, placed as close as possible to the pins. The REF pin must be driven by a low-impedance source (e.g., buffered reference or clean supply); unbuffered resistive dividers degrade CMRR. No external gain-setting resistors are needed, as the 500 V/V ratio is internally fixed. Input filtering beyond the bypass cap is optional and only recommended if EMI is present near the shunt.

Can the INA211BIDCKT measure bidirectional current, and how is polarity indicated?

Yes-the INA211BIDCKT supports bidirectional current sensing. Polarity is determined by the REF pin voltage: when REF = V+/2, output voltage centers at V+/2; current flowing from IN+ to IN− raises OUT above REF, while reverse current lowers OUT below REF. This allows a single-ended ADC to detect direction and magnitude. The device's zero-drift architecture ensures symmetric accuracy in both directions, with no added offset hysteresis.

What is the typical output voltage swing capability of the INA211BIDCKT?

The INA211BIDCKT delivers rail-to-rail output swing with defined limits: it swings to within 50 mV of V+ and 5 mV of GND when loaded with ≥10 kΩ. For example, with V+ = 5 V and REF = 2.5 V, the output ranges from ~2.505 V (–full scale) to ~4.95 V (+full scale). This swing supports direct connection to most 12-bit SAR ADCs without external op-amp buffering, reducing BOM count and layout complexity in compact designs.

How does the zero-drift architecture of the INA211BIDCKT improve measurement accuracy?

The zero-drift chopper-stabilized architecture of the INA211BIDCKT actively cancels input offset voltage and its drift over time and temperature. It achieves ±35 µV maximum offset at 25°C and only ±0.5 µV/°C drift over –40°C to +125°C-enabling stable 10-mV full-scale shunt measurements without recalibration. This eliminates the need for periodic nulling routines in firmware and ensures consistent accuracy in battery fuel gauging, power supply trimming, and safety-critical overcurrent detection circuits.