Texas Instruments INA240A4PW

Overview

INA240A4PW from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-noise PWM environments. It features 200 V/V fixed gain, –4 V to 80 V common-mode input range, ±25 μV max offset voltage, 132-dB DC CMRR, and 2.4 mA max quiescent current. It enables accurate low-side and high-side current sensing in motor control power stages.

For engineers reviewing the INA240A4PW datasheet, INA240A4PW pinout, INA240A4PW application, or INA240A4PW equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in solenoid and actuator systems, and two confirmed alternative parts with documented functional trade-offs.

Technical Context

The INA240A4PW implements a zero-drift, chopper-stabilized architecture with dedicated enhanced PWM rejection circuitry that suppresses large ΔV/Δt transients-critical for accurate current measurement during MOSFET switching edges. Its dual-reference-pin interface (REF1/REF2) supports configurable unidirectional or bidirectional output centering without external op-amps.

It operates from a single 2.7–5.5 V supply and delivers rail-to-rail output swing (VS – 0.2 V min, GND + 10 mV min) across –40°C to +125°C. The 400 kHz bandwidth and 9.8 µs settling time support fast overcurrent detection in real-time protection loops.

Key Specifications

Pinout & Package

INA240A4PW is housed in an 8-pin TSSOP package (3.00 mm × 4.40 mm), thermally optimized for surface-mount assembly and moderate-power dissipation (R_θJA = 149.1°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current sensing applications.

Compared with INA240A3PW, INA240A4PW reduces shunt power loss by 90% at 10-A FS current; compared with MAX40056ASA+, it extends safe operating common-mode range by 15 V and improves DC CMRR by 12 dB-directly enhancing accuracy in 48-V and 80-V industrial motor controls.

Availability

INA240A4PW is available at Aetrix Electronics and suitable for motor controls, solenoid actuation, and industrial power management requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for INA240A4PW includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision signal conditioning and power management ICs.

The INA240 product line was engineered specifically for high-accuracy current sensing in electrically noisy, high-voltage industrial and automotive power conversion systems-emphasizing PWM rejection, wide common-mode tolerance, and zero-drift stability.

FAQ

What is the maximum common-mode voltage supported by the INA240A4PW?

The INA240A4PW supports a common-mode input voltage range of –4 V to 80 V. This specification is guaranteed over the full operating temperature range (–40°C to +125°C) and enables reliable operation in high-side sensing configurations, including 48-V and 60-V industrial buses, as well as flyback-aware solenoid drivers where the input may dip below ground. The –4 V lower limit is critical for capturing negative transients without clipping or damage.

Does the INA240A4PW require external components for basic operation?

The INA240A4PW requires only a local 0.1-µF ceramic decoupling capacitor between VS and GND, placed within 2 mm of the pins. No external gain-setting resistors or compensation networks are needed-the 200 V/V gain is internally fixed. Reference pins (REF1/REF2) may be tied together and grounded for unidirectional use, or biased to set bidirectional output centering; no additional active circuitry is required for either mode.

How does the enhanced PWM rejection feature improve performance in motor drive applications?

The enhanced PWM rejection in the INA240A4PW actively suppresses large common-mode transients (ΔV/Δt) generated during MOSFET switching, reducing output ripple and recovery time. In motor drives, this enables accurate current measurement during the fast edge transitions of PWM gate signals-without the 10–100 µs recovery delays seen in standard amplifiers. Measured data shows <100 ns transient response with minimal overshoot, preserving fidelity for FOC algorithms and overcurrent protection.

Can the INA240A4PW measure bidirectional current, and how is it configured?

Yes, the INA240A4PW supports true bidirectional current sensing via its dual reference inputs (REF1 and REF2). To configure bidirectional operation, apply equal voltages-typically VS/2-to both REF1 and REF2. This centers the output at mid-supply (e.g., 2.5 V at 5-V VS), allowing positive current to raise the output and negative current to lower it. The device maintains ±25 µV offset and 200 V/V gain across the full range, enabling precise regenerative current measurement in H-bridge and inverter topologies.

What is the typical output voltage swing capability of the INA240A4PW?

The INA240A4PW delivers rail-to-rail output swing: minimum high-level output is VS – 0.2 V, and minimum low-level output is GND + 10 mV, tested at RL = 10 kΩ. This performance holds across –40°C to +125°C and ensures compatibility with 12-bit and higher-resolution ADCs without level-shifting. At 5-V supply, the usable output range is 10 mV to 4.8 V-providing >4.7 V of dynamic range for high-precision digitization of sensed current signals.