Texas Instruments INA199C1DCKR

Overview

INA199C1DCKR 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 ±150 μV maximum offset voltage, 100 V/V fixed gain, ±1% maximum gain error over temperature, –0.1 V to 26 V common-mode input range, and 100 μA max quiescent current - enabling precise 10-mV full-scale shunt measurements in battery-powered power management systems.

For engineers reviewing the INA199C1DCKR datasheet, INA199C1DCKR pinout, INA199C1DCKR application, or INA199C1DCKR equivalent, this device supports critical design tasks including overcurrent protection in Qi wireless chargers, precision battery charge current monitoring in notebooks, and closed-loop feedback in telecom DC/DC converters - all with minimal PCB footprint and thermal overhead.

Technical Context

The INA199C1DCKR implements a zero-drift chopper-stabilized amplifier architecture to achieve 0.5 μV/°C max offset drift and 10 ppm/°C max gain drift across –40°C to +125°C. Its differential input stage operates independently of supply voltage, allowing accurate sensing at common-mode voltages up to 26 V while powered from as low as 2.7 V.

It uses internal matched thin-film resistors (R1 = R2 = 1 MΩ, R3 = R4 = 10 kΩ) to set its fixed 100 V/V gain, delivering 80 dB minimum CMRR and 30 kHz bandwidth with 10 pF load. The REF pin supports user-defined output offset, enabling bidirectional current measurement referenced to any voltage between GND and V+.

Key Specifications

Pinout & Package

The INA199C1DCKR is housed in a 6-pin SC70 package (2.00 mm × 1.25 mm), optimized for space-constrained PCB layouts in portable electronics and compact power modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA199C1DCKR, INA219AIDR adds digital functionality but sacrifices analog flexibility and voltage range, while MAX4080TASA+ extends common-mode capability at the cost of power efficiency and SC70 compactness - making INA199C1DCKR optimal for space- and power-constrained 24-V embedded systems requiring analog output fidelity.

Availability

INA199C1DCKR is available at Aetrix Electronics and suitable for notebook power management, Qi wireless charging transmitters, and telecom DC/DC converters requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for INA199C1DCKR 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 family was designed specifically for high-accuracy, low-power current sensing in space-constrained, thermally demanding applications - targeting battery-powered consumer electronics, wireless power infrastructure, and industrial power conversion systems.

FAQ

What is the maximum common-mode voltage supported by the INA199C1DCKR?

The INA199C1DCKR supports a common-mode input voltage range of –0.1 V to 26 V across its full operating temperature range of –40°C to +125°C. This specification applies specifically to the 'C' grade version (INA199Cx), as confirmed in Section 6.5 of the SBOS469H datasheet. The –0.1 V lower limit enables true low-side sensing near ground, while the 26 V upper limit permits direct high-side monitoring on 24-V system rails without level-shifting circuitry.

Does the INA199C1DCKR require external gain-setting resistors?

No, the INA199C1DCKR does not require external gain-setting resistors. It integrates precision thin-film resistors internally to provide a fixed 100 V/V gain, as specified for the 'x2' variant in the device comparison table (Section 4). The internal resistor network (R1 = R2 = 1 MΩ, R3 = R4 = 10 kΩ) is laser-trimmed during manufacturing to ensure ±1% gain error over temperature - eliminating variability from external components and simplifying layout for high-accuracy current sensing.

Can the INA199C1DCKR measure bidirectional current?

Yes, the INA199C1DCKR supports bidirectional current measurement via its REF pin. When REF is connected to a defined voltage (e.g., V+/2 or a precision 1.25-V reference), the output becomes centered at that voltage - producing outputs above REF for positive current and below REF for negative current. This capability is explicitly documented in the Functional Block Diagram (Section 7.2) and Application Information (Section 8.1), enabling true ±I sensing with a single-ended ADC or differential receiver without additional amplification stages.

What is the purpose of the REF pin on the INA199C1DCKR?

The REF pin on the INA199C1DCKR sets the output common-mode voltage level and enables flexible current-sensing configurations. It serves as the reference for the output stage, allowing unidirectional sensing (REF = GND), bidirectional sensing (REF = mid-supply), or offset-adjusted measurement (REF = external voltage). As detailed in Section 7.4.3, REF impedance must be low (<10 Ω) or buffered to preserve CMRR; direct connection to stable references or power rails is recommended to avoid gain error and noise coupling.

Is the INA199C1DCKR pin-compatible with other variants in the INA199 family?

Yes, the INA199C1DCKR shares identical pinout and SC70-6 packaging with all other DCK-packaged INA199 variants (e.g., INA199A1DCKR, INA199B2DCKR), as confirmed in Figure 5-1 and Table 5-1 of the datasheet. All SC70 versions use the same 6-pin topology: Pin 1 = REF, Pin 2 = IN−, Pin 3 = V+, Pin 4 = IN+, Pin 5 = GND, Pin 6 = OUT. This allows direct substitution between gain variants (x1/x2/x3) and grade versions (A/B/C) without PCB redesign - provided system-level gain, offset, and temperature requirements are verified.