INA240A3PW

Overview

The INA240A3PW is a unidirectional, zero-drift current-sense amplifier manufactured by Texas Instruments. It features a fixed gain of 100 V/V and operates within a supply voltage range of 2.7 V to 5.5 V. The device supports bidirectional sensing with a common-mode voltage range extending from -4 V to 80 V. Key electrical specifications include a maximum input offset voltage of 5 µV, a power supply current of 2.4 mA, and a 3-dB bandwidth of 400 kHz. It provides a high DC common-mode rejection ratio (CMRR) of 132 dB and maintains an accuracy of 0.02%. The component is housed in an 8-pin TSSOP package and functions reliably across an extended temperature range of -40°C to +125°C.

Feature Summary

• Zero-drift architecture ensures low input offset voltage and minimal drift over temperature for high-precision measurements.
• Enhanced PWM suppression capability effectively rejects high common-mode transients associated with pulse-width modulation signals.
• Wide common-mode voltage range allows operation from -4 V to 80 V, supporting both high-side and low-side configurations.

Applications

• Motor drive systems requiring precise current monitoring under PWM control
• Solenoid and valve control circuits utilizing flyback periods
• Industrial process automation equipment

Procurement Notes

Verify the suffix 'PW' confirms the tube packaging format rather than tape-and-reel variants like 'PWR'. Confirm the specific grade 'A3' corresponds to the 100 V/V gain setting. Ensure the ordering part number matches the required package style and thermal characteristics for the target application environment.

Selection Notes

Select this component when a fixed gain of 100 V/V is required for accurate current sensing. The wide common-mode range accommodates voltages up to 80 V. The zero-drift technology is suitable for applications demanding high precision with small shunt voltages. Consider the 8-pin TSSOP footprint for space-constrained designs.

Part Context

This device belongs to the INA240 family of current-sense amplifiers designed for high-performance industrial applications. The family offers various gain options including 20, 50, and 200 V/V. The INA240A3 variant specifically provides a gain of 100 V/V. The 'PW' suffix denotes the plastic small-outline package type used in this specific part number.

Replacement Considerations

INA240A3PWR: Identical electrical specifications and functionality; differs only in tape-and-reel packaging instead of tubes.