Texas Instruments INA191A3IYFDR

Overview

INA191A3IYFDR from Texas Instruments is a unidirectional, ultra-precise current sense amplifier in a 6-pin DSBGA package, designed for high-side and low-side shunt monitoring with ±12 µV max offset voltage, 100 V/V fixed gain, 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 INA191A3IYFDR datasheet, INA191A3IYFDR pinout, INA191A3IYFDR application, or INA191A3IYFDR equivalent, key selection criteria include its 100 pA typical input bias current, 43 µA quiescent current at 25 °C, 100 nA shutdown current, and compatibility with 1.7–5.5 V supply rails in space-constrained portable electronics designs.

Technical Context

The INA191A3IYFDR employs a zero-drift architecture with capacitive-coupled input stage to achieve ultra-low input bias current (100 pA typ) and minimal offset drift (0.13 µV/°C max), enabling accurate µA-range current sensing. Its fixed 100 V/V gain and rail-to-rail output swing (VS – 40 mV min) support direct interfacing with low-voltage ADCs.

It operates across –40 °C to +125 °C with 132 dB min CMRR and 7 ppm/°C max gain drift, maintaining precision under varying bus voltages up to 40 V independent of supply voltage - critical for high-side monitoring in notebook and telecom power rails.

Key Specifications

Pinout & Package

INA191A3IYFDR is housed in a 1.17 mm × 0.765 mm, 6-pin DSBGA (YFD) package with 0.4-mm pitch and bottom-side solder balls.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA2191A3IYBJR and INA185A3IDCKR, the INA191A3IYFDR uniquely balances ultra-low power (100 nA shutdown), ultra-low bias (100 pA), and compact 6-pin DSBGA packaging - making it optimal for space- and energy-constrained single-channel portable power monitoring.

Availability

INA191A3IYFDR is available at Aetrix Electronics and suitable for notebook computers, cell phones, and battery-powered devices requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.

Supply support for INA191A3IYFDR 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 portable and battery-critical systems - emphasizing picoamp input bias, wide common-mode tolerance, and miniature WCSP packaging.

FAQ

What is the maximum common-mode voltage supported by the INA191A3IYFDR?

The INA191A3IYFDR supports a common-mode input voltage range of –0.2 V to +40 V, enabling direct high-side sensing on 24 V and 36 V rails without external level-shifting components. This specification is guaranteed across the full operating temperature range of –40 °C to +125 °C and is independent of the 1.7–5.5 V supply voltage applied to the VS pin. The INA191A3IYFDR maintains accuracy within its specified gain error and offset limits across this entire range.

Does the INA191A3IYFDR support bidirectional current sensing?

No, the INA191A3IYFDR is a unidirectional current sense amplifier. It lacks the REF pin required for bidirectional offset adjustment and is designed exclusively for single-polarity current measurement. For bidirectional applications, TI offers the pin-compatible but functionally distinct INA2191A3IYBJR, which includes dual REF inputs and separate channel enables. The INA191A3IYFDR delivers optimized performance for unidirectional use cases such as battery discharge monitoring or power supply output current limiting.

What is the typical input bias current of the INA191A3IYFDR, and why does it matter?

The typical input bias current of the INA191A3IYFDR is 100 pA, with a maximum of 3 nA over temperature. This ultra-low value minimizes voltage error across high-value shunt resistors, enabling accurate measurement of currents as low as hundreds of nanoamps - essential for leakage detection and ultra-low-power subsystem monitoring. The INA191A3IYFDR achieves this via a capacitive-coupled input stage, distinguishing it from conventional current-sense amplifiers that draw µA-level input current.

Can the INA191A3IYFDR operate from a 1.7 V supply?

Yes, the INA191A3IYFDR is fully specified to operate from a minimum supply voltage of 1.7 V, making it compatible with deeply discharged lithium-based batteries and low-voltage microcontroller domains. At 1.7 V, it maintains its full common-mode range (–0.2 V to +40 V), 100 V/V gain accuracy, and 100 nA shutdown current. The INA191A3IYFDR's performance metrics - including offset voltage, CMRR, and bandwidth - are validated across the entire 1.7–5.5 V supply range per the official datasheet.

What package type and dimensions does the INA191A3IYFDR use?

The INA191A3IYFDR 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 0.4-mm ball pitch. This wafer-level chip-scale package provides minimal footprint and thermal resistance (R_θJA = 141.4 °C/W), ideal for ultra-thin portable electronics. The INA191A3IYFDR's pinout is fixed per TI's YFD mechanical drawing and is incompatible with larger DSBGA variants like the 12-pin YBJ used by the INA2191.