Texas Instruments INA199A2DCKT

Overview

INA199A2DCKT 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 a 100 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 sensing with as little as 10-mV full-scale shunt voltage drop in notebook power rails and wireless charging transmitters.

For engineers reviewing the INA199A2DCKT datasheet, INA199A2DCKT pinout, INA199A2DCKT application, or INA199A2DCKT equivalent, key selection criteria include its guaranteed ±1.5% gain error over temperature, 0.5-μV/°C offset drift, SC70-6 package footprint, and compatibility with 2.7-V minimum supply-critical for battery-powered and space-constrained embedded systems.

Technical Context

The INA199A2DCKT implements a zero-drift chopper-stabilized amplifier architecture to achieve ultra-low offset and near-zero drift across –40°C to +125°C. Its differential input stage rejects common-mode voltages up to 26 V independent of supply, enabling direct sensing on high-voltage rails while powered from low-voltage logic supplies.

It uses internal precision resistor networks (R1/R2 = 1 MΩ, R3/R4 = 10 kΩ) to set its fixed 100 V/V gain, delivering 100 dB minimum CMRR and 30 kHz small-signal bandwidth. The REF pin supports user-defined output offset, allowing bidirectional current measurement referenced to any voltage between GND and V+.

Key Specifications

Pinout & Package

INA199A2DCKT is housed in a 6-pin SC70 package (2.00 mm × 1.25 mm), optimized for space-constrained PCB layouts. Pin functions are validated per TI SBOS469H datasheet Figure 5-1 and Table 5-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA199A2DCKT, INA210AIDCKR offers lower offset but half the gain-requiring larger shunt resistors for equivalent resolution-while MAX4005EUT+T trades common-mode range and supply flexibility for lower unit cost in narrow-voltage applications.

Availability

INA199A2DCKT is available at Aetrix Electronics and suitable for notebook computers, Qi-compliant wireless charging transmitters, telecom equipment, and USB-C PD power delivery systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for INA199A2DCKT 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, power management, and signal chain solutions.

The INA199 series is part of TI's high-accuracy current-sense amplifier portfolio, designed specifically for bidirectional, low-shunt-voltage, wide common-mode applications in portable, industrial, and power infrastructure systems.

FAQ

What is the maximum common-mode voltage supported by the INA199A2DCKT?

The INA199A2DCKT supports a common-mode input voltage range of –0.3 V to 26 V across its full operating temperature range of –40°C to +125°C. This specification applies specifically to the INA199A version per SBOS469H datasheet Section 6.5, enabling direct sensing on negative rails or 24-V industrial buses without external level-shifting circuitry. The device maintains accuracy and stability within this range when powered from as low as 2.7 V.

Does the INA199A2DCKT require an external reference voltage?

No, the INA199A2DCKT does not require an external reference voltage to function, but the REF pin must be connected to a defined voltage between GND and V+ to establish output common-mode level. When left unconnected, output behavior is undefined. For bidirectional current sensing, REF is typically tied to mid-supply (e.g., V+/2); for unidirectional use, it may be grounded. The internal circuitry does not generate a reference-it relies entirely on the externally applied REF voltage.

What is the gain accuracy of the INA199A2DCKT over temperature?

The INA199A2DCKT has a maximum gain error of ±1.5% over the full operating temperature range of –40°C to +125°C, as specified for all INA199A variants in SBOS469H datasheet Section 6.5. This includes contributions from initial tolerance, temperature drift (10 ppm/°C max), and linearity error (±0.01%). The 100 V/V gain is set by internal laser-trimmed thin-film resistors, ensuring stability without external components.

Can the INA199A2DCKT be used in high-side current sensing configurations?

Yes, the INA199A2DCKT is explicitly designed for both high-side and low-side current sensing. Its –0.3 V to 26 V common-mode input range allows the IN+ and IN– pins to operate at voltages far exceeding the 2.7–26 V supply rail. In high-side configurations, IN+ connects to the power rail (e.g., 12 V or 19 V), IN– connects to the shunt resistor load side, and the device remains fully functional-even when VCM exceeds V+-due to its proprietary input stage architecture.

What package type and dimensions does the INA199A2DCKT use?

The INA199A2DCKT uses the SC70-6 package (also designated DCK), with nominal body dimensions of 2.00 mm × 1.25 mm and a maximum height of 0.9 mm. This surface-mount package features gull-wing leads, is RoHS-compliant, and is optimized for automated placement in high-density PCB assemblies. Pin configuration follows TI's standardized SC70 layout with V+, IN+, IN–, GND, OUT, and REF assigned to pins 3, 4, 5, 2, 6, and 1 respectively.