Texas Instruments INA191A5IYFDR

Overview

INA191A5IYFDR 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 500 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 INA191A5IYFDR datasheet, INA191A5IYFDR pinout, INA191A5IYFDR application, or INA191A5IYFDR equivalent, key selection criteria include its picoamp input bias current (100 pA typ), 43 µA quiescent current at 25 °C, 100 nA shutdown current, 27 kHz bandwidth, and compatibility with 1.7–5.5 V single-supply operation in space-constrained portable electronics.

Technical Context

The INA191A5IYFDR implements a zero-drift, capacitively coupled input stage followed by a difference amplifier output stage to achieve ultra-low input bias current and extended dynamic range. Its architecture supports accurate sensing across shunts at common-mode voltages up to 40 V - independent of its 1.7–5.5 V supply rail - while maintaining RTI offset stability over –40 °C to +125 °C.

It operates exclusively in unidirectional mode (no REF pin), uses a single ENABLE digital input to control on/off states, and places the output in high-impedance during shutdown. The device does not support bidirectional sensing or dual-channel operation - those functions are exclusive to the INA2191 family variant.

Key Specifications

Pinout & Package

INA191A5IYFDR 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 INA191A5IYFDR, INA2191A5IYBJR adds channel count and bidirectionality at the cost of higher power and larger footprint, while INA190A5IYFDR sacrifices enable control and precision for marginal cost reduction - making INA191A5IYFDR the optimal choice for space-constrained, battery-sensitive unidirectional monitoring.

Availability

INA191A5IYFDR is available at Aetrix Electronics and suitable for battery fuel gauging, USB-C power delivery monitoring, and smartphone power management requiring stable component supply across high-volume consumer electronics production.

Supply support for INA191A5IYFDR 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-sensitive applications - prioritizing picoamp input bias, wide common-mode range, and miniature WCSP packaging.

FAQ

What is the maximum common-mode voltage supported by the INA191A5IYFDR?

The INA191A5IYFDR supports a common-mode input voltage range of –0.2 V to +40 V. This allows direct sensing on 24 V industrial rails or 36 V automotive subsystems without external level-shifting circuitry, while remaining fully functional with supply voltages as low as 1.7 V. The specification is guaranteed across the full –40 °C to +125 °C operating temperature range.

Does the INA191A5IYFDR support bidirectional current measurement?

No, the INA191A5IYFDR does not support bidirectional current measurement. It is a unidirectional current sense amplifier with no REF pin. Bidirectional capability is exclusive to the INA2191 family (e.g., INA2191A5IYBJR), which includes dual REF inputs. Using INA191A5IYFDR for reverse-current detection would require external circuitry and introduces measurement uncertainty.

What is the purpose of the ENABLE pin on the INA191A5IYFDR?

The ENABLE pin on the INA191A5IYFDR 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 high-impedance state - essential for minimizing standby power in battery-operated systems. It must be externally driven; floating is not permitted.

Can the INA191A5IYFDR be used with a 1.7-V supply?

Yes, the INA191A5IYFDR is fully specified for operation from 1.7 V to 5.5 V. At 1.7 V, it maintains ±0.25% gain error, ±12 µV offset, and 27 kHz bandwidth. Output swing is reduced (VS – 40 mV min), but remains compatible with 1.7-V-input ADCs. Quiescent current increases slightly to 65 µA max under these conditions.

What package type and dimensions does the INA191A5IYFDR use?

The INA191A5IYFDR 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 0.35-mm ball pitch. It is a wafer-level chip-scale package (WCSP) intended for ultra-compact layouts and automated reflow assembly - no leaded alternatives exist for this variant.