Texas Instruments INA199C3DCKR

Overview

INA199C3DCKR 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 current sensing with as little as 10-mV full-scale shunt voltage drop in notebook power rails and wireless charging transmitters.

For engineers reviewing the INA199C3DCKR datasheet, INA199C3DCKR pinout, INA199C3DCKR application, or INA199C3DCKR equivalent, this page delivers verified technical context, package-specific pin functions, real-world use cases, and validated alternative options - all grounded in TI's SBOS469H production data sheet and orderable part documentation.

Technical Context

The INA199C3DCKR implements a zero-drift chopper-stabilized amplifier architecture to achieve ultra-low offset and near-zero drift over temperature. Its differential input stage rejects common-mode voltages up to 26 V independent of supply voltage, enabling direct sensing on 12-V or 24-V bus rails while powered from a 3.3-V microcontroller rail.

It integrates matched thin-film resistors (R3 = 5 kΩ, R4 = 1 MΩ) to set its 200 V/V gain, delivering ±1% max gain error over –40°C to +125°C. The SC70-6 package supports compact placement near shunt resistors, with GND, IN+, IN–, REF, V+, and OUT pins configured for minimal parasitic impedance in high-dynamic-range current measurement circuits.

Key Specifications

Pinout & Package

The INA199C3DCKR is packaged in a 6-pin SC70 (DCK) with 2.00 mm × 1.25 mm body size and 0.65-mm lead pitch. This ultra-compact package minimizes thermal resistance (R_θJA = 227.3°C/W) and parasitic inductance for high-frequency current transients.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA199C3DCKR, INA240A3DRCR trades ultra-low power for extended voltage range and ruggedness, while MAX40056ATA+T sacrifices CMRR and reference flexibility to shrink package size - making INA199C3DCKR optimal for cost-sensitive, battery-aware 24-V applications requiring precision and design flexibility.

Availability

INA199C3DCKR is available at Aetrix Electronics and suitable for notebook computers, Qi-compliant wireless charging transmitters, and telecom equipment requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for INA199C3DCKR 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 consumer and industrial power systems - emphasizing zero-drift performance, wide common-mode operation, and SC70/UQFN packaging for modern PCB layouts.

FAQ

What is the maximum common-mode voltage supported by the INA199C3DCKR?

The INA199C3DCKR 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 'C' grade version per TI's SBOS469H datasheet Section 6.5. Exceeding 26 V requires external transient protection circuitry such as Zener clamps, as detailed in Section 7.4.4 of the same document. The –0.1 V lower limit enables true bidirectional sensing below ground in certain low-side configurations.

Does the INA199C3DCKR require an external reference voltage?

No, the INA199C3DCKR does not require an external reference voltage to operate, but the REF pin must be actively driven to a defined voltage between GND and V+ to set output common-mode level. Leaving REF floating causes undefined output behavior. In most implementations, REF is tied to GND for unipolar output or to mid-supply (e.g., V+/2) for bipolar swing. The device's internal architecture relies on REF to establish the output offset, so proper termination is essential for accuracy - as confirmed in Section 7.4.3 and Figure 7-4 of the SBOS469H datasheet.

Can the INA199C3DCKR be used in high-side current sensing applications?

Yes, the INA199C3DCKR is explicitly designed for both high-side and low-side current sensing. Its –0.1 V to 26 V common-mode input range allows direct connection to the high side of shunt resistors on 12-V or 24-V supply rails, independent of the 2.7-V to 26-V supply voltage applied to V+. This capability is documented in the device description (Section 3), functional block diagram (Section 7.2), and absolute maximum ratings (Section 6.1) of the SBOS469H datasheet. No level-shifting circuitry is needed.

What is the purpose of the NC pins on the UQFN package, and do they exist on the INA199C3DCKR?

The INA199C3DCKR uses the SC70-6 (DCK) package, which has no NC (no-connect) pins - all six pins (V+, GND, IN+, IN–, REF, OUT) are functional. NC pins appear only on the 10-pin UQFN (RSW) variant, where pins 1 and 7 are unconnected internally and may be left floating or tied to GND. Since INA199C3DCKR is orderable exclusively in DCK packaging per TI's mechanical information (Section 13), NC pin considerations do not apply. This distinction is clearly shown in Figures 5-1 and 5-2 and Table 5-1 of SBOS469H.

How does the gain error specification of ±1% for the INA199C3DCKR compare to other versions in the family?

The ±1% maximum gain error over temperature is exclusive to the 'C' grade (e.g., INA199C3DCKR); the 'A' and 'B' grades specify ±1.5% max gain error under identical conditions. This tighter tolerance reflects enhanced factory trimming and is validated across –40°C to +125°C per Section 6.5 of SBOS469H. The difference directly impacts system-level accuracy in closed-loop applications like battery chargers, where ±1% gain error contributes less than half the total current measurement uncertainty compared to ±1.5% versions.