INA241A3IDDFR

Overview

The INA241A3IDDFR is a bidirectional ultra-precise current sense amplifier from Texas Instruments, featuring a fixed gain of 50 V/V. It operates with a supply voltage range of 2.7V to 20V and supports a common-mode input voltage range from -5V to 110V. The device offers a typical DC CMRR of 166 dB and a maximum offset voltage of ±10µV. It provides a small-signal bandwidth of 1.1 MHz and a slew rate of 8 V/µs. Packaged in an 8-pin SOT-23 (DDF) format, it functions within an ambient temperature range of -40°C to +125°C.

Feature Summary

• Enhanced PWM rejection circuitry minimizes output signal disturbances caused by large common-mode voltage transients at the inputs.
• Bidirectional operation enables accurate measurement of voltage drops across shunt resistors independent of the power supply voltage.
• Zero-drift architecture ensures low offset voltage and drift for precise measurements across wide operating temperatures.

Applications

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

Procurement Notes

Verify the specific ordering suffix IDDFR corresponds to the SOT-23-8 package variant. Confirm that the A3 designation matches the required 50 V/V gain setting for your circuit design. Ensure compatibility with the specified -40°C to +125°C operating temperature range. Check for any specific handling requirements related to electrostatic discharge sensitivity during assembly.

Selection Notes

Select this component when high precision is required in switching systems with significant common-mode voltage fluctuations. The 50 V/V gain is suitable for applications needing moderate amplification of shunt voltages. Consider the SOT-23-8 package if space constraints on the PCB are critical. Evaluate the 1.1 MHz bandwidth against the system's requirement for fast over-current detection response times.

Part Context

This part belongs to the INA241x family of ultra-precise current sense amplifiers designed for high-side, inline, or low-side sensing. The 'A' version indicates tighter accuracy specifications compared to the 'B' version, specifically regarding gain error and offset voltage. The '3' suffix denotes the fixed internal gain of 50 V/V, distinguishing it from other variants offering gains of 10, 20, 100, or 200 V/V.

Replacement Considerations

INA241A3IDGKR: Same electrical specifications but housed in a VSSOP-8 package instead of SOT-23-8. Verify footprint compatibility before substitution.