INA191A5IYFDR

Overview

The INA191A5IYFDR is a low-power, voltage-output current shunt monitor manufactured by Texas Instruments. It operates with a supply voltage range of 1.7V to 5.5V and supports bidirectional current sensing within a common-mode voltage window of -0.2V to +40V. The device features a fixed gain of 500 V/V, enabling precise measurement of small differential voltages across shunt resistors. Key electrical specifications include a maximum gain error of 0.25%, an input bias current of 100pA, and a typical quiescent current of 43µA at 25°C. It is housed in a DSBGA-6 package and rated for operation between -40°C and +125°C.

Feature Summary

• Zero-drift architecture minimizes offset voltage drift to extend dynamic range for accurate low-current measurements.
• Low input bias current allows the use of larger sense resistors while maintaining microamp-level precision.
• Fixed high gain of 500 V/V amplifies small differential signals for enhanced resolution.

Applications

• Overcurrent protection circuits
• Precision current measurement in battery-powered devices
• Closed-loop feedback control systems

Procurement Notes

Verify the specific suffix 'IYFDR' against the official datasheet to confirm the package type (DSBGA) and temperature grade. Ensure the fixed gain of 500 V/V aligns with system requirements, as this variant does not support external gain adjustment. Cross-reference the manufacturer part number directly with TI documentation to avoid confusion with other gain variants in the INA191 family.

Selection Notes

Select this component when high gain is required for detecting very small voltage drops across shunt resistors. The zero-drift technology makes it suitable for applications demanding long-term stability without frequent calibration. Consider the 500 V/V gain constraint; if lower gain is needed, other variants like A1 or A2 should be evaluated instead.

Part Context

This device belongs to the INA191 series of current shunt monitors designed for low-power applications. Unlike general-purpose op-amps, it is optimized for differential voltage amplification in current sensing topologies. The series offers multiple fixed gain options to accommodate different shunt resistor values and voltage ranges.

Replacement Considerations

Direct substitutes within the same family include INA191A1, INA191A2, INA191A3, and INA191A4, which offer gains of 25, 50, 100, and 200 V/V respectively. These share identical pinouts and packaging but differ in internal gain settings.