INA240A4PW

Overview

The INA240A4PW is a high/low side, bi-directional zero-drift current sense amplifier manufactured by Texas Instruments. It features enhanced PWM rejection and operates within a wide common-mode voltage range of -4 V to 80 V. The device provides a fixed gain of 200 V/V and utilizes an 8-pin TSSOP package. Key electrical parameters include a maximum supply voltage of 5.5 V, a minimum of 2.7 V, and a maximum operating temperature of +125 °C with a minimum of -40 °C. It exhibits a typical input offset voltage of 5 µV, a gain error of 0.05%, and a bandwidth of 400 kHz.

Feature Summary

• Zero-drift architecture ensures low offset voltage and drift for precise measurements at low full-scale shunt voltages.
• Enhanced PWM rejection capability provides high-level suppression of large common-mode transients in systems using pulse-width modulation signals.
• Wide common-mode voltage range allows sensing from -4 V to 80 V, enabling operation below ground potential to accommodate flyback periods in solenoid applications.

Applications

• Motor drive systems requiring precise current monitoring under PWM control
• Solenoid control circuits utilizing bidirectional current sensing
• Industrial automation equipment needing high-precision current measurement

Procurement Notes

Verify the specific suffix 'PW' confirms the tube packaging format distinct from the 'PWR' reel variant. Confirm RoHS compliance status as indicated in official documentation. Ensure the order quantity aligns with the manufacturer's standard tube packing configuration. Check for any recent product change notices regarding marking or assembly updates before finalizing procurement.

Selection Notes

Select this component when a fixed gain of 200 V/V is required for high-side or low-side current sensing. The zero-drift technology is suitable for applications demanding accuracy with minimal shunt voltage drops. Consider the -4 V to 80 V common-mode range for compatibility with various bus voltages. Verify that the 8-TSSOP package fits the available PCB footprint constraints.

Part Context

This part belongs to the INA240 family of current sense amplifiers from Texas Instruments. The family offers multiple gain options (20, 50, 100, and 200 V/V) to suit different signal levels. The INA240 series is designed for robust performance in noisy environments, featuring enhanced PWM rejection and high CMRR, making it distinct from standard operational amplifiers used for current sensing.

Replacement Considerations

Other gains in the INA240 family (INA240A1, A2, A3) share identical pinouts and functionality but differ in fixed gain values. Direct substitution requires verifying that the alternative gain factor meets the system's output voltage requirements without saturation.