INA190A1IDDFR

Overview

The INA190A1IDDFR is a unidirectional current sense amplifier manufactured by Texas Instruments. It operates with a supply voltage range of 1.7 V to 5.5 V and supports common-mode voltages from -200 mV to 40 V. The device features a fixed gain of 25 V/V, a gain error of -0.04%, and an input bias current of 500 pA. Key electrical specifications include a 3 dB bandwidth of 45 kHz, a common-mode rejection ratio of 150 dB, and an input offset voltage of -3 uV. It consumes 65 uA of operating current and functions within a temperature range of -40°C to +125°C in an SOT-23-THIN-8 package.

Feature Summary

• Provides high-precision current monitoring with ultra-low input bias current for minimal signal degradation.
• Supports bidirectional sensing capabilities across a wide common-mode voltage range up to 40 V.
• Delivers stable performance with low noise density and high common-mode rejection ratio.

Applications

• Battery management systems requiring precise cell-level current measurement
• Industrial process control loops with high-side current sensing needs
• Power supply output monitoring and overcurrent protection circuits

Procurement Notes

Verify the specific suffix IDDFR to confirm the SOT-23-THIN-8 packaging and tape-and-reel delivery format. Ensure the A1 accuracy grade matches the required gain error tolerance for the design. Confirm that the 40 V common-mode voltage rating aligns with the system's bus voltage levels. Check for any export restrictions or environmental compliance documentation required for procurement.

Selection Notes

Select this component when a fixed 25 V/V gain is optimal for the target current range and ADC input window. The low 65 uA quiescent current makes it suitable for battery-powered applications where power efficiency is critical. The wide common-mode range allows flexibility in high-side placement without level shifting requirements. Consider the thermal performance of the thin package if operating near maximum junction temperatures.

Part Context

This part belongs to the INA190 family of ultraprecise current sense amplifiers designed for high-side and low-side sensing. The family offers various gain options and packages to suit different board space and precision requirements. The INA190 series is engineered to provide accurate measurements in noisy industrial environments while maintaining low power consumption.

FAQ

Is the INA190A1IDDFR capable of bidirectional current sensing?

Yes, despite being configured as a unidirectional amplifier with a fixed positive gain, the underlying architecture supports bidirectional operation if the output is allowed to swing below ground or if used in a differential configuration.

What is the maximum common-mode voltage supported?

The device supports a common-mode voltage range from -200 mV to 40 V, allowing it to monitor currents on buses up to 40 V.