Texas Instruments INA199A3DCKT

Overview

INA199A3DCKT 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, –0.3 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 INA199A3DCKT datasheet, INA199A3DCKT pinout, INA199A3DCKT application, or INA199A3DCKT equivalent, key selection criteria include its 200 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 INA199A3DCKT 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 (R3 = 5 kΩ, R4 = 1 MΩ) to set its fixed 200 V/V gain, delivering rail-to-rail output swing (within 50 mV of V+ and 5 mV of GND) into 10-kΩ loads. The REF pin supports programmable output offset from 0 V to V+, enabling bidirectional current measurement with single-supply ADCs.

Key Specifications

Pinout & Package

INA199A3DCKT is housed in a 6-pin SC70 package (2.00 mm × 1.25 mm), optimized for compact portable electronics. Pin functions are validated per TI SBOS469H Rev H (Oct 2023).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3DRCR and MAX40056AUB+, the INA199A3DCKT offers the smallest footprint (SC70-6) and lowest quiescent current (100 µA), making it optimal for space- and power-constrained portable electronics, though with lower common-mode tolerance and higher offset than alternatives.

Availability

INA199A3DCKT is available at Aetrix Electronics and suitable for notebook computers, Qi-compliant wireless charging transmitters, and telecom equipment requiring stable component supply across production lifecycles.

Supply support for INA199A3DCKT 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 over 50 years of innovation in precision signal conditioning and power management ICs.

The INA199 series was designed specifically for high-accuracy, low-power current sensing in portable and battery-operated systems, emphasizing zero-drift performance, wide common-mode operation, and minimal PCB area consumption.

FAQ

What is the maximum common-mode voltage supported by the INA199A3DCKT?

The INA199A3DCKT 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 specification applies specifically to the INA199A version, as confirmed in Section 6.5 of the SBOS469H datasheet. It enables direct high-side sensing on 24-V industrial rails or Li-ion battery packs without external level-shifting circuitry.

Does the INA199A3DCKT require an external reference voltage?

No, the INA199A3DCKT does not require an external reference voltage. Its REF pin accepts any voltage from 0 V to V+ to set the output common-mode level, allowing flexible configuration for unidirectional or bidirectional current sensing. When tied to mid-supply (e.g., V+/2), the device outputs centered around that voltage-enabling full-scale positive and negative current representation with single-supply ADCs.

What is the gain error specification for the INA199A3DCKT over temperature?

The INA199A3DCKT has a maximum gain error of ±1.5% over the full operating temperature range of –40°C to +125°C, as specified for the 'A' grade version in Section 1 and Table 6-5 of the SBOS469H datasheet. This includes contributions from both initial tolerance and temperature-induced drift (10 ppm/°C max), ensuring predictable scaling for precision current measurement in thermally varying environments.

Can the INA199A3DCKT be used in bidirectional current sensing applications?

Yes, the INA199A3DCKT supports bidirectional current sensing through its REF pin. By applying a reference voltage (e.g., V+/2) to REF, the output swings symmetrically above and below that level in response to current flow direction. This capability is explicitly documented in the device description and functional block diagram of SBOS469H, enabling accurate charge/discharge monitoring in battery management systems without additional op-amps.

What package type is used for the INA199A3DCKT and what are its key mechanical dimensions?

INA199A3DCKT uses the SC70-6 (DCK) package, with nominal body dimensions of 2.00 mm × 1.25 mm and a maximum height of 0.9 mm. This ultra-small outline package is optimized for space-constrained portable electronics and is distinct from the 10-pin UQFN option offered in the INA199 family. Pin compatibility and thermal characteristics (RθJA = 227.3°C/W) are fully specified in Section 13 of SBOS469H.