Texas Instruments INA240A3D

Overview

INA240A3D from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-noise PWM motor and solenoid control systems. It features 100 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 low-side and high-side shunt measurements in industrial actuator drives.

For engineers reviewing the INA240A3D datasheet, INA240A3D pinout, INA240A3D application, or INA240A3D equivalent, this page delivers verified specifications, TSSOP-8 pin mapping, real-world use cases in solenoid valve feedback and motor phase current monitoring, and two validated alternative parts with documented functional trade-offs.

Technical Context

The INA240A3D implements a zero-drift chopper-stabilized architecture with dual-stage common-mode rejection to suppress ΔV/Δt transients up to 50 kHz while maintaining 100-V/V gain accuracy. Its internal reference divider network allows configurable unidirectional or bidirectional output centering via REF1/REF2 pins.

It operates from a single 2.7–5.5 V supply, draws ≤2.4 mA quiescent current, and delivers rail-to-rail output swing (VS – 0.2 V / GND + 10 mV) across –40°C to +125°C - making it suitable for embedded power stage monitoring where supply headroom and thermal stability are constrained.

Key Specifications

Pinout & Package

INA240A3D is packaged in an 8-pin TSSOP (PW) with 3.00 mm × 4.40 mm body size and exposed thermal pad. Pin numbering follows standard TI TSSOP top-view orientation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3DR, the INA240A3D offers superior board-level thermal resistance margin in compact designs; compared with INA2290A3D, it delivers 8-dB higher AC CMRR and –4 V common-mode capability - essential for robust operation in PWM-rich industrial environments.

Availability

INA240A3D is available at Aetrix Electronics and suitable for motor controls, solenoid valve feedback systems, and industrial power supply overcurrent protection requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for INA240A3D 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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, power management, and signal chain solutions.

The INA240 product line was designed specifically for high-accuracy, high-noise immunity current sensing in motor drives, solenoid controls, and industrial power systems - emphasizing PWM rejection, wide common-mode range, and zero-drift stability.

FAQ

What is the maximum common-mode voltage the INA240A3D can handle?

The INA240A3D supports a common-mode input voltage range of –4 V to 80 V. This means it can accurately measure current through a shunt resistor even when the voltage at the shunt's terminals falls 4 V below ground (e.g., during solenoid flyback) or rises as high as 80 V above ground - covering most industrial 48-V and 60-V bus applications without external level shifting. The specification is guaranteed across –40°C to +125°C.

Does the INA240A3D require external components for PWM noise suppression?

No, the INA240A3D does not require external RC filters or snubbers for PWM noise suppression. Its enhanced PWM rejection architecture provides 93-dB AC CMRR at 50 kHz and actively attenuates large ΔV/Δt transients - demonstrated by <1.5-mV output ripple under 100-V/µs common-mode steps. This integrated capability eliminates design complexity and board space typically needed for external filtering in motor and solenoid drive feedback paths.

Can the INA240A3D measure bidirectional current, and how is it configured?

Yes, the INA240A3D supports true bidirectional current measurement. It is configured by applying equal reference voltages to both REF1 and REF2 pins - commonly tied together and set to VS/2 (e.g., 2.5 V with 5-V supply) to establish a zero-current output midpoint. When IN+ is more positive than IN–, OUT rises above the reference; when IN+ is more negative, OUT falls below it - enabling full ± current range detection with a single device and no external signal conditioning.

What is the typical quiescent current of the INA240A3D, and how does it vary with temperature?

The INA240A3D draws a maximum of 2.4 mA quiescent current at 25°C, with typical consumption of 1.8 mA. Over the full operating temperature range (–40°C to +125°C), quiescent current remains within 2.6 mA - confirmed by Figure 7-17 in the datasheet. This stable, low supply current enables use in always-on monitoring circuits and energy-constrained subsystems without compromising thermal performance or battery life.

Is the INA240A3D pin-compatible with other variants in the INA240 family?

Yes, all INA240 variants - including INA240A1D, INA240A2D, INA240A3D, and INA240A4D - share identical 8-pin TSSOP (PW) and SOIC (D) packages and pinouts. The only difference is fixed gain (20/50/100/200 V/V), so PCB layout and interface circuitry (e.g., REF pin connections, decoupling, output loading) are fully interchangeable. This simplifies design reuse and gain optimization without hardware revision.