INA241A1IDGKR

Overview

The INA241A1IDGKR is a bidirectional ultra-precise current sense amplifier from Texas Instruments. It features a fixed gain of 10V/V and operates with a supply voltage range of 2.7V to 20V. The device supports a wide common-mode input voltage range from -5V to 110V, independent of the supply voltage. Key electrical specifications include a maximum offset voltage of ±5µV, a typical DC CMRR of 166dB, and a small-signal bandwidth of 1.1MHz at all gains. It draws a quiescent current of 2.5mA and functions within an ambient temperature range of -40°C to +125°C.

Feature Summary

• Enhanced PWM rejection circuitry minimizes output signal disturbance caused by large common-mode voltage transients associated with switching systems.
• Ultra-precision architecture ensures high accuracy through low offset voltage and minimal gain error drift across the full operating temperature range.
• Bidirectional operation allows for accurate measurement of voltage drops across shunt resistors in both positive and negative current directions.

Applications

• Motor drives
• Solenoids and actuators
• Injection molding machines
• Cordless power tools

Procurement Notes

Verify the specific package marking and date code against the manufacturer's latest documentation to ensure authenticity. Confirm that the ordering suffix matches the required VSSOP-8 package variant. Check for any regional compliance certifications or specific lot traceability requirements mandated by your procurement standards before finalizing the order.

Selection Notes

Select this component when high precision is required in high-side, inline, or low-side sensing applications involving significant common-mode voltages. The fixed 10V/V gain is suitable for applications where the shunt resistor value and expected current range align with this amplification factor. Ensure the system design accommodates the 1.1MHz bandwidth and reference pin configuration for optimal performance.

Part Context

This device belongs to the INA241x family of ultra-precise current sense amplifiers designed for harsh environments. The 'A' designation indicates the ultra-precision grade with tighter tolerances compared to the standard grade. The 'DGKR' suffix specifies the VSSOP-8 package type and reel packaging format, distinguishing it from other physical form factors available within the same functional family.

Replacement Considerations

INA241A1IDR (SOIC-8 package)

FAQ

How does the INA241A1 handle large common-mode voltage transients?

It utilizes enhanced PWM rejection circuitry that holds the output for 1µs during large common-mode transitions, preventing disturbances from propagating to the output signal.

Is the input bias current dependent on the common-mode voltage?

No, the input bias current remains constant over the entire common-mode voltage range, unlike many other high-voltage current sense amplifiers.