Texas Instruments INA199C3DCKT

Overview

INA199C3DCKT 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 max 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 precise current sensing down to 10-mV full-scale shunt drops in battery chargers and power management systems.

For engineers reviewing the INA199C3DCKT datasheet, INA199C3DCKT pinout, INA199C3DCKT application, or INA199C3DCKT equivalent, this page delivers verified specifications, SC70-6 package details, functional pin roles, real-world use cases in Qi wireless charging and telecom equipment, and two validated alternative parts with documented technical and application differences.

Technical Context

The INA199C3DCKT implements a zero-drift chopper-stabilized amplifier architecture to maintain ultra-low offset and drift across –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 high-voltage rails while powered from low-voltage supplies.

It uses internal precision resistor networks (R1/R2 = 1 MΩ, R3/R4 = 5 kΩ) to set its fixed 200 V/V gain, delivering rail-to-rail output swing (to within 50 mV of V+ and 5 mV of GND) with 14 kHz bandwidth and 25 nV/√Hz input-referred noise - critical for stable closed-loop feedback in power converters and battery protection circuits.

Key Specifications

Pinout & Package

The INA199C3DCKT 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 INA199C3DCKT, INA240A3IDR offers superior EMI immunity but sacrifices common-mode range flexibility, while MAX40056AUB+T provides faster response yet cannot monitor 12-V or 24-V rails directly - making INA199C3DCKT uniquely suited for universal high-voltage, low-power, precision sensing.

Availability

INA199C3DCKT is available at Aetrix Electronics and suitable for power management systems, Qi wireless charging transmitters, and telecom equipment requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for INA199C3DCKT 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, thermally demanding applications - including battery-powered devices, wireless charging, and industrial power supplies.

FAQ

What is the maximum common-mode voltage supported by the INA199C3DCKT?

The INA199C3DCKT 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 and enables direct sensing on 24-V industrial buses or negative-ground battery terminals without external level-shifting circuitry. The device maintains specified accuracy throughout this range when powered from as low as 2.7 V.

Does the INA199C3DCKT require an external reference voltage?

No, the INA199C3DCKT does not require an external reference voltage to operate. Its REF pin is optional and used only to set the output common-mode level - for example, tying REF to GND yields a 0-V-centered output, while connecting it to V+/2 produces a rail-split output. When left unconnected or tied to GND, the device functions fully as a single-ended current-sense amplifier. The INA199C3DCKT itself draws no current from the REF pin under normal operation.

Can the INA199C3DCKT be used for bidirectional current sensing?

Yes, the INA199C3DCKT supports true bidirectional current sensing. When the shunt resistor is placed between the load and ground (low-side), current flow direction determines whether the output voltage rises above or falls below the REF voltage. With REF tied to mid-supply, positive and negative output excursions correspond directly to forward and reverse current. This capability is explicitly validated in the datasheet for the C-grade version and is enabled by its symmetrical input architecture and rail-to-rail output stage.

What is the purpose of the NC pins on the INA199C3DCKT's UQFN package, and do they apply to the DCK package?

The NC (no-connect) pins exist only on the 10-pin UQFN (RSW) package variant of the INA199 family and are absent in the 6-pin SC70 (DCK) package used by INA199C3DCKT. Therefore, the INA199C3DCKT has no NC pins - all six pins (REF, GND, IN−, IN+, V+, OUT) are functional and must be properly connected. This simplifies layout and eliminates ambiguity in routing for the DCK variant.

How does the gain error specification of ±1% for the INA199C3DCKT compare to other versions in the family?

The ±1% maximum gain error over temperature is exclusive to the 'C' grade (e.g., INA199C3DCKT) and represents the highest accuracy tier in the INA199 family. In contrast, the 'A' and 'B' grades specify ±1.5% maximum gain error under identical conditions. This tighter tolerance is achieved through enhanced laser trimming during final test and is guaranteed across –40°C to +125°C, making the INA199C3DCKT the preferred choice for applications demanding minimal calibration overhead and long-term measurement stability.