Texas Instruments INA240A4PWR

Overview

INA240A4PWR 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 enhanced PWM transient rejection-enabling accurate shunt-based current monitoring in motor drives and solenoid control where flyback voltages and fast ΔV/Δt events occur.

For engineers reviewing the INA240A4PWR datasheet, INA240A4PWR pinout, INA240A4PWR application, or INA240A4PWR equivalent, this page delivers verified specifications, TSSOP-8 pin mapping, real-world use cases in bidirectional power stages, and two validated alternative parts with documented functional trade-offs-not generic substitutes.

Technical Context

The INA240A4PWR implements a zero-drift, chopper-stabilized architecture with dual-stage common-mode rejection to suppress large-slew-rate transients (e.g., MOSFET switching edges) before amplification. Its internal reference divider network allows configurable unidirectional or bidirectional output centering via REF1/REF2 pins-critical for systems requiring rail-to-rail output swing across ±10-mV to ±150-mV sensed differential inputs.

Unlike standard current sense amplifiers, the INA240A4PWR achieves 93-dB AC CMRR at 50 kHz while maintaining 400-kHz bandwidth and 2-V/µs slew rate-enabling simultaneous fast overcurrent detection and low-distortion measurement of slower load currents (e.g., motor phase current envelopes), without sacrificing precision at 250 nV/°C offset drift.

Key Specifications

Pinout & Package

INA240A4PWR is packaged in an 8-pin TSSOP (PW) with 3.00 mm × 4.40 mm body size, optimized for thermal performance (R_θJA = 149.1°C/W) and PCB space efficiency in motor control modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A4PWR, INA240A3PWR trades gain for marginally better DC accuracy but increases shunt power loss, while MAX40056ASA+T offers comparable gain and cost but lacks integrated PWM rejection-requiring board-level design effort to match INA240A4PWR's noise immunity in switching systems.

Availability

INA240A4PWR is available at Aetrix Electronics and suitable for motor controls, solenoid actuation, and industrial power management requiring stable component supply across extended temperature and high-noise operating conditions.

Supply support for INA240A4PWR 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 focused on analog and embedded processing technologies, with decades of expertise in precision signal conditioning and power management ICs.

The INA240 family was designed specifically for high-reliability current sensing in electrically noisy environments-including motor drives, industrial automation, and telecom infrastructure-where traditional amplifiers fail under fast common-mode transients.

FAQ

What is the maximum common-mode voltage the INA240A4PWR can handle?

The INA240A4PWR supports a common-mode input voltage range from –4 V to 80 V. This –4-V capability enables reliable operation during inductive flyback events in solenoid and H-bridge circuits, while the 80-V upper limit covers 48-V and 60-V industrial bus applications. The specification is guaranteed over the full –40°C to +125°C temperature range and does not require derating.

Does the INA240A4PWR require external components for basic operation?

No, the INA240A4PWR operates with only a local 0.1-µF ceramic decoupling capacitor between VS and GND. Unlike many current sense amplifiers, it needs no external gain-setting resistors (gain is fixed at 200 V/V), no output filtering for PWM rejection, and no bias networks-the REF1/REF2 pins can be tied together and grounded for unidirectional use or set to mid-supply for bidirectional operation without additional parts.

How does the enhanced PWM rejection in the INA240A4PWR differ from standard CMRR?

Standard CMRR measures rejection of steady-state common-mode voltage; enhanced PWM rejection in the INA240A4PWR specifically targets high-slew-rate transients (ΔV/Δt), delivering 93-dB suppression at 50 kHz. This is achieved through internal architecture improvements-not just bandwidth extension-so it rejects fast edges from motor gate drivers without increasing noise or requiring external filters, unlike conventional amplifiers that rely solely on high AC CMRR.

Can the INA240A4PWR measure bidirectional current with a single supply?

Yes, the INA240A4PWR supports true bidirectional current sensing with a single 2.7–5.5-V supply by configuring REF1 and REF2 pins to set the output midpoint. For example, tying both to 1.65 V produces a 0-A output of 1.65 V, with +10-A yielding ~3.15 V and –10-A yielding ~0.15 V-enabling full-range measurement into a 3.3-V ADC without dual supplies or level shifters.

What is the minimum shunt resistor value supported by the INA240A4PWR at full scale?

With its 200 V/V gain and 3-V full-scale output, the INA240A4PWR achieves full scale with only 15 mV across the shunt. For a 15-A maximum current, this allows a 1.0-mΩ shunt (15 A × 1.0 mΩ = 15 mV). At that value, power dissipation is just 0.225 W-enabling compact, low-thermal-drift designs impossible with lower-gain alternatives requiring ≥30-mV drops.