Texas Instruments INA191A4IYFDR

Overview

INA191A4IYFDR from Texas Instruments is a unidirectional, ultra-precise current sense amplifier in 6-pin DSBGA (YFD) package, designed for high-side and low-side shunt monitoring with 200 V/V fixed gain, ±12 µV max offset voltage, 7 ppm/°C max gain drift, and –0.2 V to +40 V wide common-mode input range. It enables microamp-level current measurement in battery-powered power management systems.

For engineers reviewing the INA191A4IYFDR datasheet, INA191A4IYFDR pinout, INA191A4IYFDR application, or INA191A4IYFDR equivalent, key selection criteria include its 100 pA typical input bias current, 43 µA quiescent current at 25 °C, 100 nA shutdown current, 33 kHz bandwidth, and compatibility with 1.7–5.5 V supply rails in space-constrained portable electronics.

Technical Context

The INA191A4IYFDR implements a zero-drift, capacitively coupled input stage followed by a difference amplifier output stage - enabling ultra-low input bias current (100 pA typ.) and extended dynamic range for µA-range current sensing. Its architecture supports operation with supply voltage as low as 1.7 V while accurately measuring shunt voltages across common-mode potentials up to 40 V.

It features an active-high ENABLE pin that places the output in high-impedance state and reduces supply current to ≤100 nA when disabled. The device operates across –40 °C to +125 °C and is specified with ±0.25% max gain error (A4 variant), 0.13 µV/°C max offset drift, and 132–150 dB CMRR over temperature.

Key Specifications

Pinout & Package

INA191A4IYFDR is housed in a 1.17 mm × 0.765 mm, 6-pin DSBGA (YFD) package with bottom-side solder balls. The package is optimized for minimal PCB area and thermal resistance (R_θJA = 141.4 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA191A4IYFDR, INA2191A4IYBJR adds dual-channel and bidirectional capability at the cost of higher power and larger package, while INA185A4IDR trades enable functionality and ultra-low bias current for SOIC manufacturability and slightly relaxed offset performance.

Availability

INA191A4IYFDR is available at Aetrix Electronics and suitable for notebook computers, USB-C power delivery systems, and portable medical devices requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for INA191A4IYFDR 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 engineered specifically for ultra-low-power, high-accuracy current sensing in space- and energy-constrained portable electronics - emphasizing picoamp input bias, wide common-mode tolerance, and integrated enable control.

FAQ

What is the maximum common-mode voltage supported by the INA191A4IYFDR?

The INA191A4IYFDR supports a common-mode input voltage range of –0.2 V to +40 V. This allows it to accurately monitor current on supply rails significantly higher than its own 1.7–5.5 V supply voltage - such as 12 V, 24 V, or 36 V systems - without external level-shifting circuitry. The specification is guaranteed across the full –40 °C to +125 °C operating temperature range.

Does the INA191A4IYFDR support bidirectional current sensing?

No, the INA191A4IYFDR is a unidirectional current sense amplifier. It measures current flowing in one direction only - from IN+ to IN−. Bidirectional capability is exclusive to the INA2191 family (e.g., INA2191A4IYBJR), which includes dedicated REF pins to set a mid-supply offset for negative current representation. The INA191A4IYFDR output is referenced to GND and cannot indicate reverse current flow.

What is the purpose of the ENABLE pin on the INA191A4IYFDR?

The ENABLE pin on the INA191A4IYFDR is an active-high digital control that powers down the internal amplifier chain when pulled low. When disabled, the device draws ≤100 nA supply current and places the OUT pin in a high-impedance state - isolating it from downstream circuitry. This feature is essential for ultra-low-power applications like battery fuel gauging, where periodic current sampling minimizes average system current.

Can the INA191A4IYFDR operate from a 1.8-V supply?

Yes, the INA191A4IYFDR is fully specified to operate from a minimum supply voltage of 1.7 V up to 5.5 V. At 1.8 V, it maintains all key performance parameters including ±0.25% max gain error, ±12 µV max offset voltage, and 33 kHz bandwidth. Quiescent current remains at 43 µA (typical) at 25 °C, making it ideal for single-cell Li-ion (2.7–4.2 V) or coin-cell (1.5–3.0 V) powered systems.

What package type and dimensions does the INA191A4IYFDR use?

The INA191A4IYFDR uses a 6-pin DSBGA (Die Size Ball Grid Array) package designated YFD, with nominal body dimensions of 1.17 mm × 0.765 mm and a footprint area of 0.895 mm². It features bottom-side solder balls for compact PCB layout and improved thermal performance (R_θJA = 141.4 °C/W). This package is optimized for automated assembly in high-density portable electronics.