Texas Instruments INA214CIDCKT

Overview

INA214CIDCKT from Texas Instruments is a voltage-output, bidirectional, zero-drift current-shunt monitor optimized for high-side or low-side sensing in power management systems. It features 100 V/V fixed gain, ±60 µV maximum input offset voltage (RTI), 0.5 µV/°C max offset drift, 30 kHz bandwidth, and operates from 2.7 V to 26 V supply - enabling accurate 10-mV full-scale shunt measurements in battery chargers and telecom power rails.

For engineers reviewing the INA214CIDCKT datasheet, INA214CIDCKT pinout, INA214CIDCKT application, or INA214CIDCKT equivalent, this page delivers verified specifications, SC70-6 package layout, real-world use cases in notebook power monitoring and USB-C PD systems, and validated alternative parts with documented functional trade-offs.

Technical Context

The INA214CIDCKT implements a precision zero-drift chopper-stabilized amplifier architecture with matched internal resistive feedback (R1 = R2 = 1 MΩ; R3 = 10 kΩ), delivering 100 V/V gain without external components. Its input stage supports common-mode voltages from –0.1 V to 26 V independent of supply, enabling direct sensing on 12-V or 24-V rails while powered from 3.3-V or 5-V logic supplies.

It integrates a rail-to-rail output stage with ±0.05 V swing to V+ and +0.005 V to GND at 10-kΩ load, and achieves 105 dB minimum CMRR over –40°C to +125°C. Input bias current remains below 35 µA across full common-mode range, minimizing error in high-impedance shunt configurations.

Key Specifications

Pinout & Package

INA214CIDCKT is packaged in a 6-pin SC70 (DCK) footprint measuring 2.00 mm × 1.25 mm, optimized for space-constrained PCB layouts in portable electronics and modular power bricks.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA214AIDCKT, the INA214CIDCKT offers tighter offset (±60 µV vs ±100 µV) and superior ESD immunity (±3500 V vs ±2000 V HBM), making it preferred for industrial and automotive-adjacent designs; versus INA226AIRSAT, it delivers lower latency, simpler analog interface, and smaller footprint but lacks digital telemetry and onboard shunt.

Availability

INA214CIDCKT is available at Aetrix Electronics and suitable for server power supplies, USB-C PD controllers, notebook battery management, and industrial motor drives requiring stable component supply across multi-year production cycles.

Supply support for INA214CIDCKT 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- and energy-constrained systems - targeting applications where shunt-based measurement must coexist with tight thermal budgets and aggressive size requirements.

FAQ

What is the maximum common-mode voltage supported by the INA214CIDCKT?

The INA214CIDCKT 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 buses or 12-V automotive subsystems without external level-shifting circuitry. The –0.1 V lower limit enables accurate measurement during negative transient events, such as inductive kickback in motor drive applications.

Can the INA214CIDCKT measure bidirectional current, and how is polarity determined?

Yes, the INA214CIDCKT supports bidirectional current sensing by configuring the REF pin. When REF is tied to GND, positive output voltage indicates current flow from IN+ to IN– (e.g., battery discharge); when REF is biased to mid-supply (e.g., VS/2), the output swings above and below REF to indicate direction. This capability is confirmed in TI's SBOS437K datasheet Section 6.4.2 and enables single-device charge/discharge monitoring in portable electronics.

What is the purpose of the REF pin on the INA214CIDCKT, and what happens if it's left unconnected?

The REF pin sets the output voltage common-mode level and must be actively driven - it is not internally terminated. Leaving REF floating causes undefined output behavior and violates absolute maximum ratings. TI specifies REF must be connected to a low-impedance source between 0 V and V+. For unidirectional sensing, tie REF to GND; for bidirectional, connect to a precision voltage reference or resistor divider buffered by an op amp to preserve CMRR.

Does the INA214CIDCKT require external gain-setting resistors?

No, the INA214CIDCKT has a factory-trimmed fixed gain of 100 V/V achieved via laser-trimmed internal thin-film resistors (R1 = R2 = 1 MΩ; R3 = 10 kΩ). This eliminates external component count, layout sensitivity, and resistor tolerance errors - a key differentiator from general-purpose op-amps used in discrete current-sense circuits. Gain accuracy is specified as ±0.5% over temperature for Version C devices like INA214CIDCKT.

How does the SC70-6 package of the INA214CIDCKT affect thermal performance in high-current applications?

The SC70-6 package has a junction-to-ambient thermal resistance (RθJA) of 227.3°C/W, meaning power dissipation above ~1.3 mW raises die temperature significantly. Since INA214CIDCKT draws only 100 µA max, self-heating is negligible (<0.03°C rise at 26 V). However, PCB copper area under the exposed pad (if present) and thermal vias are still recommended to manage ambient heating from nearby power components - especially in dense server PSU layouts.