Texas Instruments INA199B2DCKT

Overview

INA199B2DCKT 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 100 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 with ≤100 μA quiescent current. It enables 10-mV full-scale shunt measurements in notebook power management and wireless charging transmitters.

For engineers reviewing the INA199B2DCKT datasheet, INA199B2DCKT pinout, INA199B2DCKT application, or INA199B2DCKT equivalent, this page delivers verified technical context, package-specific pin functions, real-world use-value per application, and validated alternative options - all grounded in TI's SBOS469H production data sheet and official package documentation.

Technical Context

The INA199B2DCKT implements a zero-drift chopper-stabilized amplifier architecture to maintain precision across –40°C to +125°C, achieving ±1.5% max gain error over temperature and 10 ppm/°C gain drift. Its differential input stage rejects common-mode voltages up to 26 V independent of supply voltage, enabling direct sensing on battery rails or DC bus lines.

It uses internal matched thin-film resistors (R3 = 10 kΩ, R4 = 1 MΩ) to set its 100 V/V gain, with input bias currents below 28 μA and CMRR ≥100 dB over temperature. The SC70-6 package supports compact placement near shunt resistors while maintaining thermal resistance of 227.3°C/W (Junction-to-Ambient).

Key Specifications

Pinout & Package

The INA199B2DCKT is housed in a 6-pin SC70 package (2.00 mm × 1.25 mm body), optimized for space-constrained PCB layouts near shunt resistors. Pin functions are validated per TI SBOS469H 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 INA240A2DRCR and MAX40056AUB+, the INA199B2DCKT uniquely balances ultra-low offset, 26-V common-mode operation, SC70-6 size, and 2.7–26-V supply flexibility - making it optimal for space-limited, multi-rail embedded power systems where thermal stability and layout simplicity are prioritized over raw bandwidth.

Availability

INA199B2DCKT is available at Aetrix Electronics and suitable for notebook computers, Qi-compliant wireless charging transmitters, and telecom equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for INA199B2DCKT 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 product line was designed specifically for high-accuracy, low-power current sensing in space-constrained, thermally demanding applications such as portable computing, wireless power, and industrial power conversion.

FAQ

What is the maximum common-mode voltage supported by the INA199B2DCKT?

The INA199B2DCKT 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 is explicitly defined for INA199Bx versions in TI's SBOS469H datasheet Section 6.5, enabling reliable high-side sensing on 24-V industrial rails without level-shifting circuitry. The device maintains functionality even when VIN+ exceeds the V+ supply voltage by up to 26 V.

Does the INA199B2DCKT require external gain-setting resistors?

No, the INA199B2DCKT does not require external gain-setting resistors. It integrates precision thin-film resistors (R3 = 10 kΩ, R4 = 1 MΩ) to deliver a fixed 100 V/V gain, as confirmed in TI's SBOS469H Section 4 Device Comparison Table and Section 7.3.2. This eliminates resistor matching errors and board space usage, ensuring consistent gain accuracy of ±1.5% over temperature without user configuration.

Can the INA199B2DCKT be used for bidirectional current sensing?

Yes, the INA199B2DCKT supports true bidirectional current sensing by biasing the REF pin to a defined voltage (e.g., V+/2). When current flows in either direction across the shunt, the output swings above or below the REF level - enabling detection of charge and discharge currents in battery management systems. This capability is documented in TI's SBOS469H Section 7.4.2 and Figure 7-4.

What is the thermal resistance (θJA) of the INA199B2DCKT in its SC70-6 package?

The INA199B2DCKT in the DCK (SC70-6) package has a junction-to-ambient thermal resistance (θJA) of 227.3°C/W, as specified in TI's SBOS469H Section 6.4 Thermal Information. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves significantly with copper pour and thermal vias beneath the exposed pad (though the SC70-6 has no thermal pad).

How does the zero-drift architecture of the INA199B2DCKT improve measurement accuracy?

The zero-drift architecture of the INA199B2DCKT reduces input offset voltage to ±150 μV maximum and limits offset drift to 0.5 μV/°C over –40°C to +125°C. This enables accurate 10-mV full-scale shunt measurements without calibration, cuts shunt power dissipation by 90% versus conventional 100-mV designs, and maintains stability during thermal cycling - directly improving long-term accuracy in notebook power rails and wireless charging systems.