Texas Instruments INA212BIDCKR

Overview

INA212BIDCKR 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 1000 V/V, ±35 µV maximum offset voltage (over temperature), 0.5 µV/°C max offset drift, and operates from 2.7 V to 26 V supply with ≤100 µA quiescent current. It enables 10-mV full-scale shunt measurements in battery chargers and telecom power management systems.

For engineers reviewing the INA212BIDCKR datasheet, INA212BIDCKR pinout, INA212BIDCKR application, or INA212BIDCKR equivalent, this page delivers verified specifications, SC70-6 package details, functional pin roles, real-world use cases in power delivery monitoring, and two validated alternative parts with documented technical and application differences.

Technical Context

The INA212BIDCKR implements a precision zero-drift chopper-stabilized amplifier topology to achieve ultra-low input offset and near-zero thermal drift. Its differential input stage supports common-mode voltages from –0.1 V to 26 V independent of supply voltage, enabling direct sensing on high-side 12-V or 24-V rails while powered from a 3.3-V or 5-V domain.

It delivers 1000 V/V fixed gain with ±0.5% max gain error (Version C) over –40°C to +125°C, 4-kHz bandwidth, and 25 nV/√Hz input-referred voltage noise. The REF pin allows output level shifting, supporting single-supply ADC interfacing without level-shifting circuitry.

Key Specifications

Pinout & Package

INA212BIDCKR is packaged in a 6-pin SC70 (DCK) package with nominal body size 2.00 mm × 1.25 mm and 0.65-mm pitch. This RoHS-compliant, surface-mount package supports high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA212BIDCKR, INA213BIDCKR trades gain and offset for bandwidth and dynamic range, while MAX40056AUT+T offers speed at the cost of common-mode and supply voltage range-making INA212BIDCKR the optimal choice for precision 24-V rail monitoring where low drift and wide CMR are critical.

Availability

INA212BIDCKR is available at Aetrix Electronics and suitable for power supply monitoring, battery charge management, telecom power shelf supervision, and industrial motor drive protection requiring stable component supply and long-term production continuity.

Supply support for INA212BIDCKR 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 specializing in analog and embedded processing technologies, with leadership in precision amplifiers, power management, and signal chain solutions.

The INA21x product line was engineered for high-accuracy, low-power current sensing in space-constrained, thermally demanding environments such as notebook adapters, telecom rectifiers, and battery-powered instrumentation.

FAQ

What is the maximum common-mode voltage supported by the INA212BIDCKR?

The INA212BIDCKR supports a common-mode input voltage range of –0.1 V to 26 V across the full operating temperature range (–40°C to +125°C). This specification applies to Version B and C devices, and enables reliable high-side sensing on 24-V industrial rails without external level-shifting circuitry. The INA212BIDCKR maintains 105 dB minimum CMRR within this range, ensuring robust noise immunity in noisy power environments.

Does the INA212BIDCKR require an external reference voltage?

No, the INA212BIDCKR does not require an external reference voltage to operate. Its REF pin is optional and used only to set the output common-mode level: grounding REF yields a 0-V to V+ output swing, while connecting REF to mid-supply enables bipolar output centered at that voltage. The device contains no internal reference; all output scaling is determined by gain and shunt voltage, making it fully functional with REF tied to GND or left unconnected in basic configurations.

Can the INA212BIDCKR measure bidirectional current?

Yes, the INA212BIDCKR supports true bidirectional current measurement. When the REF pin is grounded, a positive differential input (IN+ > IN−) produces a positive output voltage, and a negative differential input (IN− > IN+) produces a negative output voltage relative to GND-provided the output stage remains within its rail-to-rail swing limits. This capability is explicitly confirmed in TI's SBOS437K datasheet Section 3 and enables charge/discharge monitoring in battery systems without polarity-switching circuitry.

What is the typical bandwidth and slew rate of the INA212BIDCKR?

The INA212BIDCKR has a typical small-signal bandwidth of 4 kHz (at C_LOAD = 10 pF) and a slew rate of 0.4 V/µs. These values are measured under standard conditions (V_S = 12 V, V_IN+ = 12 V, V_REF = V_S/2) and enable accurate capture of load-step transients up to ~1 kHz. The 4-kHz bandwidth is intentionally optimized for DC–low-frequency current monitoring rather than high-speed signal acquisition, aligning with its target applications in power management and battery systems.

Is the INA212BIDCKR pin-compatible with other INA21x variants in SC70-6 package?

Yes, all INA21x devices-including INA210, INA211, INA212, INA213, INA214, and INA215-in the SC70-6 (DCK) package share identical pinout and footprint. Pin assignments (V+, GND, IN−, IN+, REF, OUT) are functionally consistent across the family, allowing direct substitution based on gain and accuracy requirements without PCB layout changes. However, gain-specific internal resistor networks mean electrical performance (e.g., bandwidth, input impedance) differs per variant, so system-level validation is required after substitution.