Texas Instruments INA240A2DR

Overview

INA240A2DR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-noise PWM environments. It features 50 V/V fixed gain, ±25 μV max input offset voltage, 132-dB DC CMRR, –4 V to 80 V common-mode range, and operates from 2.7–5.5 V supply - enabling accurate shunt-based current monitoring in motor control inverters with flyback recovery.

For engineers reviewing the INA240A2DR datasheet, INA240A2DR pinout, INA240A2DR application, or INA240A2DR equivalent, key selection criteria include enhanced PWM transient rejection (93 dB AC CMRR at 50 kHz), low-drift zero-drift architecture, bidirectional output configurability via REF1/REF2 pins, and TSSOP-8 packaging for space-constrained power stage layouts.

Technical Context

The INA240A2DR implements a zero-drift chopper-stabilized amplifier core with dedicated high-slew-rate input stages to suppress large ΔV/Δt common-mode transients typical of H-bridge gate drive switching. Its internal reference divider network allows precise output midpoint setting between GND and VS without external components.

Unlike conventional current amplifiers, it 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 analog feedback in closed-loop motor drives operating up to 20-kHz PWM frequencies.

Key Specifications

Pinout & Package

INA240A2DR is packaged in an 8-pin TSSOP (PW) with 3.00 mm × 4.40 mm body size, optimized for thermal performance and PCB area efficiency in motor driver modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1DR and INA240A3DR, the INA240A2DR strikes optimal balance between sensitivity (50×), noise immunity, and shunt resistor sizing - making it the default choice for 30–70-A motor phases and 5–20-A solenoid loads with 3.3-V ADC interfaces.

Availability

INA240A2DR 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-reliability production cycles.

Supply support for INA240A2DR 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 designed specifically for high-noise industrial and automotive current sensing - delivering enhanced PWM rejection, wide common-mode operation, and zero-drift stability in compact surface-mount packages.

FAQ

What is the maximum common-mode voltage the INA240A2DR can handle?

The INA240A2DR supports a common-mode input voltage range of –4 V to 80 V. This allows it to accurately measure current during inductive flyback events (e.g., solenoid turn-off) where the shunt node dips below ground, and also enables high-side sensing in 48-V or 60-V industrial bus systems. The specification is guaranteed across the full –40°C to +125°C operating temperature range.

Does the INA240A2DR require external components for basic operation?

No, the INA240A2DR operates autonomously with only a local 0.1-μF ceramic decoupling capacitor on the VS pin. Its fixed 50 V/V gain, integrated zero-drift architecture, and configurable reference inputs eliminate the need for external gain-setting resistors, trimming potentiometers, or offset nulling circuits - simplifying layout and improving long-term stability compared to discrete op-amp solutions.

How does the INA240A2DR achieve enhanced PWM rejection?

The INA240A2DR achieves enhanced PWM rejection through proprietary high-frequency common-mode rejection circuitry combined with a zero-drift amplifier core. It delivers 93 dB AC CMRR at 50 kHz - significantly exceeding standard current sense amplifiers - by suppressing large ΔV/Δt transients before they propagate through the signal chain. This is validated in TI's SBOS662C datasheet Figure 7-21 and Figure 7-22 showing <100-mV output overshoot during 100-V/µs common-mode steps.

Can the INA240A2DR be used for bidirectional current sensing?

Yes, the INA240A2DR supports true bidirectional current sensing via its dual reference pins (REF1 and REF2). By biasing both pins to VS/2 (e.g., 2.5 V with 5-V supply), the output centers at mid-supply and swings symmetrically positive or negative relative to that point based on current direction. This enables single-supply microcontrollers to resolve forward/reverse motor currents without level-shifting circuitry.

What package options are available for the INA240A2DR?

INA240A2DR is offered exclusively in the 8-pin TSSOP (PW) package with nominal dimensions of 3.00 mm × 4.40 mm. This thermally enhanced, surface-mount package provides superior power dissipation (R_θJA = 149.1°C/W) versus SOIC-8 and is optimized for automated assembly in motor control modules and power supply boards.