Texas Instruments INA199B3DCKR

Overview

INA199B3DCKR 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 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 with ≤100 μA quiescent current. It enables 10-mV full-scale shunt measurements in notebook power rails and Qi wireless charging transmitters.

For engineers reviewing the INA199B3DCKR datasheet, INA199B3DCKR pinout, INA199B3DCKR application, or INA199B3DCKR equivalent, this page delivers verified electrical specs, SC70-6 package layout, real-world use cases in battery chargers and telecom equipment, and validated alternative parts with documented gain and temperature performance differences.

Technical Context

The INA199B3DCKR implements a zero-drift chopper-stabilized amplifier architecture to achieve ultra-low offset and drift, enabling precise measurement of small differential voltages across shunt resistors under wide common-mode conditions. Its internal matched resistor network (R3 = 5 kΩ, R4 = 1 MΩ) sets the 200 V/V gain without external components.

It supports bidirectional sensing via reference voltage control at the REF pin (0 V to V+), maintains >100 dB CMRR over temperature, and delivers rail-to-rail output swing (within 50 mV of V+ and 5 mV of GND) into 10-kΩ loads - critical for direct interfacing with low-voltage ADCs in space-constrained portable systems.

Key Specifications

Pinout & Package

INA199B3DCKR is housed in a 6-pin SC70 package (2.00 mm × 1.25 mm, 0.95 mm height), optimized for high-density PCB layouts in portable electronics. Pin functions are validated per TI SBOS469H Rev. O (Oct 2023).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA199B3DCKR, INA240A3DRCR offers lower offset in low-voltage systems but lacks 24-V rail compatibility, while MAX40056ATA+T extends common-mode range to 65 V at the cost of 3.3× higher max offset - making INA199B3DCKR optimal for precision 12–24-V portable power applications.

Availability

INA199B3DCKR is available at Aetrix Electronics and suitable for notebook computers, Qi-compliant wireless charging transmitters, and telecom equipment requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for INA199B3DCKR 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 and power management ICs.

The INA199 product line was designed specifically for high-accuracy, low-power current sensing in space-constrained consumer and industrial power systems - emphasizing zero-drift stability, wide common-mode operation, and SC70 packaging for portable electronics.

FAQ

What is the maximum common-mode voltage supported by the INA199B3DCKR?

The INA199B3DCKR supports a common-mode input voltage range of –0.1 V to 26 V across its IN+ and IN– pins, as specified for version B devices over the full –40°C to 125°C operating temperature range. This allows reliable high-side sensing on 24-V industrial rails and low-side sensing near ground without requiring level-shifting circuitry. The –0.1 V lower limit enables accurate measurement even when the shunt is placed below ground potential in certain bidirectional configurations.

Does the INA199B3DCKR require external gain-setting resistors?

No, the INA199B3DCKR does not require external gain-setting resistors. It integrates a precision 5-kΩ and 1-MΩ resistor network internally to deliver a fixed 200 V/V gain, eliminating component count, layout sensitivity, and matching errors associated with discrete resistor networks. This monolithic design ensures guaranteed gain accuracy of ±1.5% over temperature and simplifies PCB layout compared to programmable current-sense amplifiers.

Can the INA199B3DCKR measure bidirectional current flow?

Yes, the INA199B3DCKR supports bidirectional current measurement through its REF pin, which accepts an externally applied reference voltage from 0 V to V+. When REF is set to mid-supply (e.g., V+/2), the output centers at that voltage - positive current produces output above REF, negative current produces output below REF. This eliminates the need for dual-supply operation or additional signal-conditioning circuitry in battery charge/discharge monitoring applications using INA199B3DCKR.

What is the typical quiescent current consumption of the INA199B3DCKR?

The INA199B3DCKR draws a maximum of 100 μA quiescent current at 25°C, with typical consumption of 65 μA under nominal conditions (V_S = 5 V, V_SENSE = 0 mV). This ultra-low power draw remains stable across the full –40°C to 125°C temperature range, making INA199B3DCKR suitable for always-on current monitoring in battery-powered devices such as notebooks and portable chargers without compromising runtime.

Which package type is used for the INA199B3DCKR?

The INA199B3DCKR uses the SC70-6 package (DCK), a surface-mount, 6-pin plastic package measuring 2.00 mm × 1.25 mm with a 0.95-mm maximum height. This compact footprint is optimized for high-density PCB layouts in portable electronics and enables short, low-inductance connections to shunt resistors - critical for maintaining accuracy in high-frequency switching environments where INA199B3DCKR is commonly deployed.