INA241B2IDR

Overview

The INA241B2IDR is a bidirectional current sense amplifier from the Texas Instruments INA241x family, housed in an SOIC-8 package. It features a fixed gain of 20 V/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. Key electrical specifications include a maximum gain error of ±0.1%, a typical DC common-mode rejection ratio (CMRR) of 130 dB, and a small-signal bandwidth of 1.1 MHz across all gains.

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 over a wide common-mode range independent of supply voltage.
• Zero-drift architecture provides low offset voltage and drift for precise measurements across the full operating temperature range.

Applications

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

Procurement Notes

Verify the specific suffix ID indicates the SOIC-8 surface-mount package configuration. Confirm that the B version accuracy specifications align with system requirements, as they differ from the A version. Ensure the selected component matches the required gain of 20 V/V for the intended application design.

Selection Notes

Select this part when high-side, inline, or low-side sensing is required within a -5V to 110V common-mode range. The 20 V/V gain suits applications needing moderate amplification. Consider the B version's ±0.1% gain error if ultra-precision is not mandatory. Verify thermal performance in the SOIC-8 package for the expected power dissipation levels.

Part Context

This component belongs to the INA241x series of ultra-precise current sense amplifiers designed for switching systems with high common-mode voltages. The 'B' designation denotes a specific accuracy grade distinct from the 'A' version, while the 'IDR' suffix specifies the SOIC-8 tape-and-reel packaging format.

Replacement Considerations

INA241A2IDR offers higher precision with ±0.01% gain error but maintains identical pinout and functionality.

FAQ

How does the INA241B2IDR handle fast common-mode transitions?

It utilizes enhanced PWM rejection circuitry that holds the output for 1 µs during large common-mode transients to prevent disturbance propagation.

What is the relationship between the common-mode voltage and the supply voltage?

The common-mode input range (-5V to 110V) is independent of the supply voltage, which only needs to be between 2.7V and 20V.