Texas Instruments INA2191A4IYBJR

Overview

INA2191A4IYBJR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier in a 12-pin DSBGA package, featuring 200 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 accurate µA-range current measurement in battery-powered power management systems.

For engineers reviewing the INA2191A4IYBJR datasheet, INA2191A4IYBJR pinout, INA2191A4IYBJR application, or INA2191A4IYBJR equivalent, this page delivers verified specifications, dual-channel bidirectional sensing context, WCSP package layout guidance, and real-world implementation constraints for high-accuracy shunt-based monitoring in space-constrained portable electronics.

Technical Context

The INA2191A4IYBJR implements a zero-drift, capacitively coupled input stage followed by a difference amplifier output stage to achieve 100 pA typical input bias current and 0.13 µV/°C max offset drift. Its dual-channel architecture supports independent enable control (ENABLE1/ENABLE2) and separate reference inputs (REF1/REF2), enabling true bidirectional current sensing per channel with externally applied reference voltages.

It maintains ±0.25% gain error across –40°C to +125°C and delivers 33 kHz bandwidth at 200 V/V gain. The device enters high-impedance output state and draws only 20–200 nA total quiescent current when both enable pins are low, making it suitable for always-on monitoring in energy-sensitive applications.

Key Specifications

Pinout & Package

INA2191A4IYBJR is housed in a 1.17 mm × 1.53 mm, 12-ball DSBGA (YBJ) package with 0.4-mm pitch. The package supports solder reflow per JEDEC J-STD-020 and provides thermal resistance R_θJA = 94.1°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA2191A4IYBJR, INA2290AIRGET offers 15× higher bandwidth but lacks enable control and bidirectional operation, while MAX40010FAUT#T integrates an ADC yet sacrifices 4× higher offset and cannot natively resolve current direction-making INA2191A4IYBJR uniquely suited for precision, low-power, dual-path battery telemetry.

Availability

INA2191A4IYBJR is available at Aetrix Electronics and suitable for notebook computers, USB-C power delivery systems, and medical wearable battery safety monitoring requiring stable component supply and long-term production continuity.

Supply support for INA2191A4IYBJR 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 INAx191 product line was designed specifically for ultra-low-power, high-accuracy current sensing in battery-constrained portable electronics, emphasizing picoamp input bias, zero-drift stability, and WCSP packaging for minimal board area.

FAQ

What is the maximum common-mode voltage supported by the INA2191A4IYBJR?

The INA2191A4IYBJR supports a common-mode input voltage range of –0.2 V to +40 V, independent of supply voltage. This allows direct high-side sensing on 36-V battery rails while operating from a 3.3-V MCU supply, eliminating external level-shifting circuitry. The specification is guaranteed across –40°C to +125°C and applies to both IN+1/IN–1 and IN+2/IN–2 pairs in the INA2191A4IYBJR.

Does the INA2191A4IYBJR support bidirectional current measurement, and how is it implemented?

Yes, the INA2191A4IYBJR supports true bidirectional current measurement per channel using dedicated REF1 and REF2 pins. When a reference voltage (e.g., VS/2) is applied to REF1, the OUT1 output becomes V_OUT1 = 200 × (IN+1 – IN–1) + V_REF1, allowing positive/negative differential inputs to produce outputs above/below the reference. This architecture enables precise charge/discharge discrimination in battery management without external op-amps or polarity switches.

What is the quiescent current of the INA2191A4IYBJR in active and shutdown modes?

In active mode with both channels enabled, the INA2191A4IYBJR draws 96–130 µA (typical to max) at 1.8 V supply. When both ENABLE1 and ENABLE2 are driven low, total quiescent current drops to 20–200 nA across temperature. This ultra-low shutdown current enables always-connected battery self-discharge monitoring in wearables and IoT nodes without measurable impact on shelf life.

Can the INA2191A4IYBJR be used with a 1.7-V supply, and what performance trade-offs apply?

Yes, the INA2191A4IYBJR is fully specified from 1.7 V to 5.5 V supply. At 1.7 V, output swing is reduced to within 40 mV of VS and 1 mV above GND, and bandwidth remains 33 kHz. Gain error and offset remain within datasheet limits (±0.25%, ±12 µV), but output drive capability decreases slightly-requiring ≥10-kΩ ADC input impedance or buffer amplification for optimal SNR in low-voltage systems.

How does the 100 pA input bias current of the INA2191A4IYBJR improve measurement accuracy in low-current applications?

The 100 pA typical input bias current minimizes error introduced by current flowing through the sense resistor itself-critical when measuring µA-level currents with high-value shunts (e.g., 10 kΩ). For example, with a 100 mΩ shunt at 10 µA, traditional amplifiers with 1 nA bias would add 1% error; the INA2191A4IYBJR reduces this to <0.01%, enabling reliable coulomb counting in energy-harvesting and medical sensor applications.