INA241B1IDR

Overview

The INA241B1IDR is a bidirectional current sense amplifier from the Texas Instruments INA241B series, housed in an SOIC-8 package. It features a fixed gain of 10 V/V and supports a common-mode voltage range from -5 V to 110 V. The device operates on a single supply voltage between 2.7 V and 20 V with a typical quiescent current of 2.5 mA. Key electrical specifications include a maximum offset voltage of ±150 µV, a maximum gain error of ±0.1%, and a DC common-mode rejection ratio (CMRR) of 120 dB. It provides a small-signal bandwidth of 1.1 MHz and a slew rate of 8 V/µs.

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 input architecture ensures 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 package variant when sourcing. Confirm that the B-series accuracy parameters meet the system requirements, as they differ from the A-series. Ensure the application design accounts for the 120 dB CMRR specification rather than assuming higher precision values found in other variants.

Selection Notes

Select this component when a fixed 10 V/V gain is required for high-side or low-side sensing applications involving switching systems. The B-series offers a balance of performance suitable for general industrial use. Consider the SOIC-8 package for standard surface-mount assembly processes. Evaluate the 1.1 MHz bandwidth against the system's transient response needs.

Part Context

This part belongs to the INA241x family of ultra-precise current sense amplifiers designed for high-voltage bidirectional measurements. The family includes multiple gain options and accuracy grades (A and B). The INA241B1 specifically provides the 10 V/V gain configuration within the B-series, which has distinct offset and gain error specifications compared to the A-series counterparts.

Replacement Considerations

INA241A1IDR

FAQ

How does the INA241B1 handle common-mode voltage transients?

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

What is the input bias current characteristic of this device?

The device draws a typical input bias current of 35 µA per pin, which remains constant across the entire common-mode voltage range from -5 V to 110 V.