Texas Instruments INA191A1IYFDR

Overview

INA191A1IYFDR 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 in space-constrained, battery-powered systems. It delivers 25 V/V fixed gain, ±12 µV max offset voltage, 0.25% max gain error (A2–A5), and operates from 1.7 V to 5.5 V supply across –40°C to +125°C - enabling µA-range current measurement in notebook power rails and USB-C PD chargers.

For engineers reviewing the INA191A1IYFDR datasheet, INA191A1IYFDR pinout, INA191A1IYFDR application, or INA191A1IYFDR equivalent, key selection criteria include its 100 pA typical input bias current, 40 V common-mode range extending beyond supply voltage, 43 µA quiescent current at 25°C, and enable-controlled high-impedance output state - all critical for precision, low-power, high-voltage sensing in portable and telecom power management.

Technical Context

The INA191A1IYFDR employs a zero-drift, capacitively coupled input stage followed by a difference amplifier output stage to achieve ultra-low input bias current (100 pA typ) and minimal offset drift (0.13 µV/°C max). Its architecture supports operation with common-mode voltages from –0.2 V to +40 V independent of VS, enabling accurate sensing on 12 V, 24 V, or 36 V rails using only a 1.8 V or 3.3 V supply.

It features a single-channel, voltage-output configuration with digital ENABLE control: when ENABLE = VS, the device draws ≤65 µA and drives OUT; when ENABLE = GND, supply current drops to ≤100 nA and OUT enters high-impedance mode. Unlike the dual-channel INA2191, the INA191A1IYFDR lacks REF pins and bidirectional capability - it is strictly unidirectional with fixed 25 V/V gain.

Key Specifications

Pinout & Package

INA191A1IYFDR uses a 6-pin DSBGA (YFD) package measuring 1.17 mm × 0.765 mm with 0.4-mm pitch. The package is bottom-soldered and requires controlled thermal relief for reflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA210AIDR and MAX40016AUB+, the INA191A1IYFDR uniquely combines 100 pA input bias, ENABLE functionality, and 40 V common-mode range in a 0.895-mm² DSBGA - making it optimal for miniaturized, battery-critical designs requiring both precision and dynamic power control.

Availability

INA191A1IYFDR is available at Aetrix Electronics and suitable for notebook computers, USB-C power delivery systems, and telecom equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for INA191A1IYFDR 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 energy-efficient systems - targeting applications where µA-level resolution, wide common-mode tolerance, and minimal supply overhead are mandatory.

FAQ

What is the maximum common-mode voltage the INA191A1IYFDR can measure?

The INA191A1IYFDR supports a common-mode input voltage range of –0.2 V to +40 V, independent of its supply voltage (1.7 V to 5.5 V). This allows it to accurately sense current on high-voltage rails - such as 24 V industrial buses or 36 V battery stacks - while operating from a low-voltage MCU supply. The specification is validated across –40°C to +125°C and applies directly to the INA191A1IYFDR variant per TI SLYS020C datasheet Section 6.3.

Does the INA191A1IYFDR support bidirectional current sensing?

No, the INA191A1IYFDR does not support bidirectional current sensing. It is a unidirectional current sense amplifier with a fixed 25 V/V gain and no REF pin. Bidirectional capability is exclusive to the INA2191 family (e.g., INA2191A1), which includes dual REF inputs for offset-based polarity reversal. The INA191A1IYFDR's functional block diagram, pinout, and electrical characteristics in the official datasheet confirm single-direction operation only.

What is the typical quiescent current of the INA191A1IYFDR at 25°C?

The typical quiescent current of the INA191A1IYFDR is 43 µA at 25°C and 1.8 V supply, as specified in Section 6.5 of the TI SLYS020C datasheet. Maximum enabled current is 65 µA across temperature and supply conditions. When disabled (ENABLE = GND), quiescent current drops to ≤100 nA - a key differentiator for battery longevity in always-monitoring applications.

Can the INA191A1IYFDR be used with a 1.7 V supply?

Yes, the INA191A1IYFDR is fully specified to operate down to 1.7 V supply voltage, with performance maintained across the full –40°C to +125°C temperature range. At 1.7 V, output swing is characterized to within 40 mV of VS and 1 mV above GND (Section 6.5, VSP/VSN), and gain error remains within ±0.35%. This makes the INA191A1IYFDR suitable for single-cell Li-ion (2.5–4.2 V) and emerging 1.8 V logic systems.

What package type is used for the INA191A1IYFDR?

The INA191A1IYFDR 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 ultra-compact 0.895-mm² package is optimized for space-constrained portable electronics and is documented in TI's SLYS020C datasheet Section 12 and Package Option Addendum.