INA240A2PW

Overview

The INA240A2PW is a zero-drift current-sense amplifier manufactured by Texas Instruments. It features a fixed gain of 50 V/V and operates with a supply voltage range of 2.7 V to 5.5 V. The device supports bidirectional current sensing within a common-mode voltage range of -4 V to 80 V. Key electrical parameters include a maximum input offset voltage of 5 µV, a maximum quiescent current of 2.4 mA, and a bandwidth of 400 kHz. It is housed in an 8-pin TSSOP package and functions across an extended temperature range of -40°C to +125°C.

Feature Summary

• Zero-drift architecture ensures high precision with low offset voltage and drift for accurate measurements at low shunt voltages.
• Enhanced PWM suppression provides high-level rejection of common-mode transients in systems utilizing pulse-width modulation signals.
• Wide common-mode voltage range allows operation from -4 V to 80 V, enabling functionality below ground potential.

Applications

• Motor drive control systems
• Solenoid control circuits
• Industrial process automation
• Power supply monitoring

Procurement Notes

Verify the specific suffix 'PW' corresponds to the TSSOP-8 package variant rather than the tape-and-reel 'PWR' version. Confirm that the A2 grade meets the required gain accuracy specifications for the design. Check manufacturer lifecycle status as some inventory sources indicate end-of-life notifications for certain variants. Ensure ESD handling protocols are followed during assembly due to the sensitivity of the zero-drift input stage.

Selection Notes

Select this component when precise DC current measurement is required in high-noise environments with significant common-mode voltage swings. The 50 V/V gain is suitable for applications where the shunt voltage drop is moderate. Consider the -4 V lower limit if the circuit operates with negative common-mode potentials. Compare against other gain variants like INA240A1 or A3 if different signal scaling is necessary for the downstream ADC or microcontroller interface.

Part Context

This part belongs to the INA240 family of high/low-side, bidirectional, zero-drift current-sense amplifiers. The family offers multiple fixed gain options (20, 50, 100, and 200 V/V) to accommodate various shunt resistor values. The INA240 series is designed to replace traditional op-amp solutions by integrating precision resistors and enhanced transient immunity directly into the IC package.

Replacement Considerations

INA240A2PWR is the reel-pack equivalent of the same functional device. Other gain variants such as INA240A1PW (20 V/V), INA240A3PW (100 V/V), and INA240A4PW (200 V/V) share the same package and pinout but differ in internal gain settings.