Texas Instruments INA211CIDCKR

Overview

INA211CIDCKR from Texas Instruments is a precision voltage-output current-shunt monitor optimized for bidirectional, low- or high-side sensing in power management systems. It features 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 across –40°C to +125°C - enabling accurate 10-mV full-scale shunt measurements in battery chargers and telecom equipment.

For engineers reviewing the INA211CIDCKR datasheet, INA211CIDCKR pinout, INA211CIDCKR application, or INA211CIDCKR equivalent, this page delivers verified specifications, SC70-6 package layout, zero-drift architecture context, and validated alternatives for current-sense amplifier selection in space-constrained, high-common-mode industrial and portable designs.

Technical Context

The INA211CIDCKR implements a zero-drift chopper-stabilized amplifier topology with matched internal resistor networks (R3 = 2 kΩ, R4 = 2 kΩ) to achieve ±35 µV max input offset and 0.5 µV/°C max drift over –40°C to +125°C. Its differential input stage supports common-mode voltages from –0.1 V to 26 V independent of supply voltage, enabling direct sensing on 24-V rails while powered from 3.3 V.

With 500 V/V gain, 7 kHz bandwidth (C_L = 10 pF), and 0.4 V/µs slew rate, it delivers fast, stable output response to current transients. Input bias current remains ≤35 µA across common-mode range, and PSRR exceeds 100 dB at DC, ensuring robust operation in noisy power-supply environments.

Key Specifications

Pinout & Package

INA211CIDCKR is packaged in a 6-pin SC70 (DCK) footprint measuring 2.00 mm × 1.25 mm, optimized for high-density PCB layouts and automated assembly. The package is RoHS-compliant and rated for extended temperature operation (–40°C to +125°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA211CIDCKR, INA212AIDCKR offers double the gain for sub-10-mV sensing but demands stricter noise mitigation, while MAX40056ASA+T trades precision and size for enhanced ruggedness and integrated diagnostics - neither matches the combination of 500 V/V, ±35 µV, and 2.0 mm × 1.25 mm footprint.

Availability

INA211CIDCKR is available at Aetrix Electronics and suitable for battery charger monitoring, telecom power shelf supervision, USB-C power delivery, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for INA211CIDCKR 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 designed specifically for high-accuracy, low-power current sensing in space-constrained applications - targeting battery management, telecom infrastructure, and industrial automation where shunt-based measurement dominates.

FAQ

What is the maximum common-mode voltage supported by the INA211CIDCKR?

The INA211CIDCKR 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 specification applies to Version C devices like INA211CIDCKR and enables direct high-side sensing on 24-V systems without external level-shifting circuitry. The –0.1 V lower limit also permits limited negative-rail monitoring in fault-detection applications.

Does the INA211CIDCKR require external gain-setting resistors?

No, the INA211CIDCKR does not require external gain-setting resistors. It integrates a precision 500 V/V gain ratio via internal laser-trimmed thin-film resistors (R3 = R4 = 2 kΩ), eliminating resistor tolerance, thermal drift, and layout-induced errors. This fixed-gain architecture simplifies design, reduces BOM count, and guarantees gain error ≤±0.5% over temperature - a key advantage over programmable current-sense amplifiers.

Can the INA211CIDCKR be used for bidirectional current sensing?

Yes, the INA211CIDCKR supports true bidirectional current sensing. Its differential input architecture accepts both positive and negative differential voltages (VIN+ – VIN–) across the shunt resistor. When the shunt voltage polarity reverses - indicating reverse current flow - the output voltage swings below the REF pin voltage. With REF tied to mid-supply (e.g., V+/2), the output linearly tracks bidirectional current with 500× scaling in both directions.

What is the purpose of the REF pin on the INA211CIDCKR?

The REF pin on the INA211CIDCKR sets the output voltage's common-mode level. The output is defined as V_OUT = 500 × (V_IN+ – V_IN–) + V_REF. Tying REF to ground yields a unipolar 0–V_OUT(max) output; connecting it to V+/2 enables bipolar output for bidirectional sensing; and referencing it to an external precision voltage improves ADC compatibility and noise rejection in differential acquisition systems.

Is the INA211CIDCKR compatible with low-voltage microcontrollers (e.g., 1.8-V or 3.3-V ADCs)?

Yes, the INA211CIDCKR is fully compatible with low-voltage microcontrollers. Its output swings within 0.005 V of GND and up to (V+) – 0.2 V, so with a 3.3-V supply, it delivers 0.005–3.1 V output - well-suited for direct connection to 3.3-V SAR or delta-sigma ADCs. For 1.8-V ADCs, use REF = 0.9 V and ensure V+ ≥ 2.7 V; output then ranges from 0.9 V – 0.005 V to 0.9 V + 3.1 V, requiring level-shifting or ratiometric scaling only if full 0–1.8 V range is mandatory.