Texas Instruments INA199A1DCKT

Overview

INA199A1DCKT 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, 50 V/V fixed gain, –0.3 V to 26 V common-mode input range, and operates from 2.7 V to 26 V supply. It enables 10-mV full-scale shunt measurements in notebook power management and wireless charging transmitters.

For engineers reviewing the INA199A1DCKT datasheet, INA199A1DCKT pinout, INA199A1DCKT application, or INA199A1DCKT equivalent, key selection criteria include its guaranteed offset drift (≤0.5 μV/°C), gain error (±1.5% over temperature), SC70-6 package footprint, and compatibility with low-voltage microcontroller ADC inputs in battery-powered systems.

Technical Context

The INA199A1DCKT implements a zero-drift chopper-stabilized amplifier architecture to maintain precision 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 12-V or 24-V rails while powered from 3.3-V or 5-V logic supplies.

It delivers 50 V/V fixed gain with 80-kHz bandwidth and 0.4 V/μs slew rate, supporting fast transient detection in overcurrent protection circuits. Input bias current remains below 28 μA, and quiescent current is capped at 100 μA - critical for always-on battery monitoring applications.

Key Specifications

Pinout & Package

INA199A1DCKT is packaged in a 6-pin SC70 (2.00 mm × 1.25 mm) surface-mount package with wettable flanks, optimized for automated optical inspection (AOI) and space-constrained portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA219AIDR, INA199A1DCKT provides superior offset drift control (0.5 vs. 2 μV/°C) and analog bandwidth (80 kHz vs. 10 kHz), making it more suitable for closed-loop power control. Against MAX40056AUT+T, it trades CMR headroom for significantly lower quiescent power and tighter temperature coefficient - optimal for portable 12-V/24-V applications.

Availability

INA199A1DCKT 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 INA199A1DCKT 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 leadership 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 - targeting portable computing, wireless power, and industrial power conversion systems.

FAQ

What is the maximum common-mode voltage the INA199A1DCKT can handle?

The INA199A1DCKT supports a common-mode input voltage range of –0.3 V to 26 V across its IN+ and IN– pins, independent of supply voltage. This allows direct high-side sensing on 24-V rails even when powered from a 3.3-V supply. The specification is guaranteed over the full –40°C to +125°C operating temperature range for the INA199A1DCKT variant.

Does the INA199A1DCKT require an external reference voltage?

No - the INA199A1DCKT does not require an external reference. Its REF pin is optional and used only to set output common-mode level; it can be tied to GND for 0-V-referenced output or to V+/2 for rail-to-rail centered output. The device functions fully with REF grounded, and no external reference IC is needed for basic current sensing in the INA199A1DCKT.

Can the INA199A1DCKT measure bidirectional current?

Yes - the INA199A1DCKT supports true bidirectional current measurement. When the shunt resistor is placed between load and ground (low-side), current direction is determined by polarity of the voltage at OUT relative to REF. For high-side placement, the same principle applies: positive OUT indicates current flowing toward load, negative indicates reverse flow - confirmed in INA199A1DCKT datasheet Figure 8-2.

What is the gain error specification for the INA199A1DCKT over temperature?

The INA199A1DCKT has a maximum gain error of ±1.5% over the full –40°C to +125°C temperature range, as specified in Section 6.5 of the official datasheet. This includes contributions from both initial tolerance and temperature-induced drift (≤10 ppm/°C). The value is distinct from the tighter ±1% spec of the C-grade variant and is explicitly validated for the A1 version.

Is the SC70-6 package of the INA199A1DCKT compatible with standard reflow profiles?

Yes - the INA199A1DCKT in SC70-6 (DCK) package is rated for standard lead-free reflow per JEDEC J-STD-020. Its moisture sensitivity level (MSL) is 1, meaning unlimited floor life at ≤30°C/60% RH. Peak reflow temperature is 260°C, and the package supports automated optical inspection (AOI) due to wettable flank geometry - verified in TI's INA199A1DCKT packaging documentation.