Texas Instruments INA199A2DCKR

Overview

INA199A2DCKR from Texas Instruments is a bidirectional, zero-drift current-shunt monitor optimized for high-accuracy, low-power current sensing in both high-side and low-side configurations. It features 100 V/V fixed gain, ±150 μV max offset voltage, –0.3 V to 26 V common-mode input range, 100 μA max quiescent current, and operates from 2.7 V to 26 V supply. It enables precise 10-mV full-scale shunt measurements in notebook power rails and wireless charging transmitters.

For engineers reviewing the INA199A2DCKR datasheet, INA199A2DCKR pinout, INA199A2DCKR application, or INA199A2DCKR equivalent, key selection criteria include its 100 V/V gain accuracy (±1.5% over temperature), 0.5 μV/°C offset drift, SC70-6 package footprint, and compatibility with low-voltage microcontroller ADCs in space-constrained portable power systems.

Technical Context

The INA199A2DCKR implements a zero-drift chopper-stabilized amplifier architecture to achieve ultra-low offset and near-zero drift over –40°C to +125°C. Its differential input stage rejects common-mode voltages up to 26 V independent of supply voltage, enabling direct sensing on battery or bus rails without level-shifting.

It uses internal precision resistor networks (R1/R2 = 1 MΩ, R3/R4 = 10 kΩ) to set its fixed 100 V/V gain, delivering 10 ppm/°C max gain drift and 100 dB min CMRR. The output is rail-to-rail capable down to GND + 5 mV and within 200 mV of V+, supporting direct interface to 3.3-V or 5-V ADCs.

Key Specifications

Pinout & Package

INA199A2DCKR is packaged in a 6-pin SC70 (2.00 mm × 1.25 mm) surface-mount package, optimized for compact DC/DC converter and portable charger layouts. Pin 1 is REF, Pin 2 is IN+, Pin 3 is V+, Pin 4 is IN−, Pin 5 is GND, and Pin 6 is OUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA210AIDCKR and MAX40056AUT+T, the INA199A2DCKR uniquely balances 26-V common-mode tolerance, true bidirectional capability down to –0.3 V, SC70-6 compatibility, and production-proven reliability in portable power systems-making it the optimal drop-in choice for next-gen USB-C and Qi designs requiring no layout change.

Availability

INA199A2DCKR is available at Aetrix Electronics and suitable for notebook computers, Qi-compliant wireless charging transmitters, and telecom power management systems requiring stable component supply across multi-year production cycles.

Supply support for INA199A2DCKR 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 leadership in precision signal conditioning and power management ICs.

The INA199 series was designed specifically for high-accuracy, low-power current sensing in space-constrained portable and industrial power systems-emphasizing zero-drift stability, wide common-mode operation, and SC70/UQFN packaging for modern DC/DC and battery applications.

FAQ

What is the maximum common-mode voltage supported by the INA199A2DCKR?

The INA199A2DCKR supports a common-mode input voltage range of –0.3 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 low-side sensing with negative transients, without external level-shifting circuitry. The device maintains specified performance even when V_CM exceeds the V+ supply voltage, a critical feature for battery and adapter applications.

Does the INA199A2DCKR require an external reference voltage?

No, the INA199A2DCKR does not require an external reference voltage to operate. Its REF pin can be tied to GND for unipolar output (0 V to V+), to V+/2 for symmetric swing, or left floating if unused. When grounded, the device outputs a voltage proportional to sensed current with 0 V representing zero current-enabling direct interface with single-supply ADCs without additional biasing components.

What is the gain error specification for the INA199A2DCKR over temperature?

The INA199A2DCKR has a maximum gain error of ±1.5% over the full operating temperature range of –40°C to +125°C. This specification applies to the A-grade version (denoted by "A2" in the part number) and includes both initial tolerance and thermal drift effects. The 10 ppm/°C max gain drift contributes predictably to this total error budget, enabling robust system-level calibration strategies in automotive and industrial environments.

Can the INA199A2DCKR be used for bidirectional current sensing?

Yes, the INA199A2DCKR supports true bidirectional current sensing due to its –0.3 V to 26 V common-mode input range and rail-to-rail output stage. When the REF pin is tied to mid-supply (e.g., V+/2), the output swings symmetrically above and below that reference-producing positive voltage for current in one direction and negative voltage for the reverse. This enables accurate charge/discharge monitoring in smart battery packs without polarity-switching circuitry.

What package type is used for the INA199A2DCKR and what are its key mechanical dimensions?

INA199A2DCKR uses the SC70-6 (DCK) package: a 6-pin, surface-mount, leadless plastic package measuring 2.00 mm × 1.25 mm with 0.65-mm pin pitch. Its low profile (<0.9 mm height) and small footprint make it suitable for ultra-thin consumer electronics. The package is RoHS-compliant, halogen-free, and rated for reflow soldering per JEDEC J-STD-020, supporting automated assembly in high-volume manufacturing.