Texas Instruments INA199B3DCKT

Overview

INA199B3DCKT from Texas Instruments is a bidirectional, zero-drift current-shunt monitor optimized for high-accuracy, low-voltage-sense applications in both high-side and low-side configurations. It features 200 V/V fixed gain, ±150 μV maximum offset voltage, 0.5 μV/°C max offset drift, –0.1 V to 26 V common-mode input range, and operates from 2.7 V to 26 V supply. It enables precise sensing of 10-mV full-scale shunt drops in power management and battery charging circuits.

For engineers reviewing the INA199B3DCKT datasheet, INA199B3DCKT pinout, INA199B3DCKT application, or INA199B3DCKT equivalent, this device supports design of compact, low-power current monitoring systems requiring stable gain accuracy (±1.5% over temperature), ultra-low quiescent current (100 μA max), and robust operation across –40°C to +125°C.

Technical Context

The INA199B3DCKT implements a zero-drift chopper-stabilized amplifier architecture with matched internal resistor networks (R3 = 5 kΩ, R4 = 1 MΩ) to achieve 200 V/V gain and <0.5 μV/°C offset drift. Its differential input stage operates independently of supply voltage, allowing accurate sensing at common-mode voltages up to 26 V - exceeding its own 2.7–26 V supply range.

It delivers rail-to-rail output swing (within 50 mV of V+ and 5 mV of GND at 10 kΩ load), supports REF pin biasing from 0 V to V+, and maintains 100 dB minimum CMRR across –40°C to +125°C. Input bias current remains below 28 μA, and PSR exceeds ±0.1 μV/V over 2.7–18 V supply variation.

Key Specifications

Pinout & Package

The INA199B3DCKT 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 wireless power applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3DDBVR and MAX40056AUB+, the INA199B3DCKT uniquely combines 26-V common-mode tolerance, SC70 footprint, and 100 μA quiescent current - making it optimal for compact, wide-input industrial and portable power monitors where supply voltage may exceed 5.5 V.

Availability

INA199B3DCKT is available at Aetrix Electronics and suitable for notebook computers, Qi-compliant wireless charging transmitters, and telecom equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for INA199B3DCKT 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 INA199 series was designed specifically for high-accuracy, low-power current sensing in space-constrained, wide-input-voltage applications - including battery management, wireless power, and industrial power supplies.

FAQ

What is the maximum common-mode voltage the INA199B3DCKT can measure?

The INA199B3DCKT 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 specifically to the INA199Bx version, enabling reliable high-side sensing on 24-V industrial rails and low-side sensing with slight negative headroom, independent of its 2.7–26 V supply voltage.

Does the INA199B3DCKT require external resistors to set gain?

No, the INA199B3DCKT has a fixed 200 V/V gain implemented via internal laser-trimmed resistor networks (R3 = 5 kΩ, R4 = 1 MΩ). No external gain-setting components are needed - simplifying layout, improving temperature stability, and eliminating resistor matching errors that would degrade accuracy in discrete solutions.

Can the INA199B3DCKT be used in bidirectional current sensing applications?

Yes, the INA199B3DCKT supports true bidirectional current sensing. Its differential inputs (IN+ and IN–) allow polarity-reversible connection across the shunt resistor, and its output swings symmetrically around the REF voltage - enabling accurate measurement of both charge and discharge currents in battery systems and USB-C PD implementations.

What is the purpose of the REF pin on the INA199B3DCKT?

The REF pin on the INA199B3DCKT sets the output voltage's common-mode level. When tied to mid-supply (e.g., V+/2), it centers the output swing for optimal dynamic range with single-ended ADCs. It can also be grounded for unidirectional low-side sensing or biased to other voltages to match ADC reference requirements - but must be buffered if driven by high-impedance sources.

How does the zero-drift architecture of the INA199B3DCKT improve measurement accuracy?

The zero-drift chopper-stabilized architecture of the INA199B3DCKT limits offset voltage drift to 0.5 μV/°C maximum over –40°C to +125°C. This enables stable 10-mV full-scale shunt measurements without periodic calibration, reduces thermal-induced gain error, and maintains <1.5% total error across temperature - critical for battery fuel gauging and thermal-safe wireless charging control loops.