Texas Instruments INA2191A5IYBJR

Overview

INA2191A5IYBJR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier in a 12-pin DSBGA package, featuring 500 V/V fixed gain, ±0.25% max gain error, ±12 µV max offset voltage, and 100 pA typical input bias current. It operates from 1.7 V to 5.5 V supply and supports common-mode voltages from –0.2 V to +40 V, enabling high-side and low-side microamp-level current monitoring in battery-powered power management systems.

For engineers reviewing the INA2191A5IYBJR datasheet, INA2191A5IYBJR pinout, INA2191A5IYBJR application, or INA2191A5IYBJR equivalent, key selection criteria include bidirectional sensing capability via dual REF pins, dual-channel independent enable control (ENABLE1/ENABLE2), zero-drift architecture for µA-range accuracy, and thermal performance validated up to +125°C in the YBJ package.

Technical Context

The INA2191A5IYBJR implements a zero-drift, capacitively coupled input stage followed by a difference amplifier output stage-enabling 100 pA typical input bias current and 0.13 µV/°C max offset drift. Its dual-channel architecture includes independent ENABLE1/ENABLE2 inputs and REF1/REF2 pins, allowing fully independent bidirectional current measurement per channel with externally set reference offsets.

Each channel delivers 500 V/V gain with 27 kHz bandwidth and 0.3 V/µs slew rate, while maintaining 132–150 dB CMRR over –0.1 V to 40 V common-mode range. The device draws 96–130 µA quiescent current when both channels are enabled and only 20–200 nA when both enables are low-supporting ultra-low-power system wake-up and sleep-state current profiling.

Key Specifications

Pinout & Package

INA2191A5IYBJR is housed in a 1.17 mm × 1.53 mm, 12-pin DSBGA (YBJ) package with 0.4-mm pitch and bottom-side solder balls. Thermal resistance is R_θJA = 94.1°C/W and R_θJB = 23.8°C/W, supporting high-density PCB layouts with efficient board-level heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional current sensing applications.

Compared with INA2290AIRGTR and MAX40056AUB+, the INA2191A5IYBJR uniquely delivers dual-channel analog bidirectional sensing at 40 V with 100 pA bias and 500 V/V gain-enabling compact, low-power, high-accuracy current audit across multiple rails without ADC overhead or external offset circuitry.

Availability

INA2191A5IYBJR is available at Aetrix Electronics and suitable for battery fuel gauging, USB-C power delivery monitoring, and industrial sensor node power audit requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for INA2191A5IYBJR 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 INAx191 product line was designed for ultra-low-power, high-accuracy current sensing in space-constrained, battery-sensitive applications-including portable electronics, medical devices, and energy-harvesting systems-where µA-level resolution and 40 V common-mode capability are mandatory.

FAQ

What is the maximum common-mode voltage supported by the INA2191A5IYBJR?

The INA2191A5IYBJR supports a common-mode input voltage range of –0.2 V to +40 V, independent of its 1.7–5.5 V supply voltage. This allows direct monitoring of 12 V, 24 V, or 40 V power rails while powered from a low-voltage microcontroller rail-eliminating the need for level-shifting circuitry in high-side sensing applications.

How does the REF1 and REF2 pin enable bidirectional current sensing in the INA2191A5IYBJR?

In the INA2191A5IYBJR, REF1 and REF2 pins set the DC offset for OUT1 and OUT2 respectively. When REFx = VS/2, the output centers at VS/2, so positive current yields OUTx > VS/2 and negative current yields OUTx < VS/2-enabling full-scale bidirectional measurement per channel without external op-amps or level translators.

What is the quiescent current of the INA2191A5IYBJR when both channels are enabled versus disabled?

The INA2191A5IYBJR draws 96–130 µA quiescent current when both ENABLE1 and ENABLE2 are high (VS), and only 20–200 nA when both are driven low (GND). This ultra-low shutdown current makes it ideal for battery-powered systems requiring periodic current sampling without compromising standby battery life.

Can the INA2191A5IYBJR accurately measure sub-microamp currents?

Yes-the INA2191A5IYBJR's 100 pA typical input bias current and ±12 µV max offset voltage, combined with 500 V/V gain, enable reliable detection of currents down to ~20 µA using a 100 mΩ shunt. Its zero-drift architecture ensures this resolution remains stable across –40°C to +125°C without recalibration.

What package type and dimensions does the INA2191A5IYBJR use?

The INA2191A5IYBJR uses a 12-pin DSBGA (YBJ) package measuring 1.17 mm × 1.53 mm with 0.4-mm ball pitch. Its small footprint and low thermal resistance (R_θJA = 94.1°C/W) support high-density PCB layouts in portable and wearable electronics where space and thermal performance are critical.