Texas Instruments INA240A4D

Overview

INA240A4D 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 - enabling accurate low-side and high-side shunt monitoring in motor drives and solenoid controls.

For engineers reviewing the INA240A4D datasheet, INA240A4D pinout, INA240A4D application, or INA240A4D equivalent, this page delivers verified specifications, package mapping, real-world use cases, and validated alternative options - all grounded in TI's SBOS662C production data sheet and official device documentation.

Technical Context

The INA240A4D implements a zero-drift, chopper-stabilized architecture with dedicated enhanced PWM rejection circuitry that suppresses large ΔV/Δt transients (e.g., during MOSFET switching) before amplification. Its dual-reference-pin architecture (REF1/REF2) supports configurable unidirectional or bidirectional output midpoints without external op-amps.

It operates from a single 2.7–5.5 V supply and delivers 400 kHz bandwidth with 9.8 µs settling time (0.5%); its input stage tolerates –4 V common-mode - critical for flyback recovery in solenoid control - while maintaining 93-dB AC CMRR at 50 kHz.

Key Specifications

Pinout & Package

INA240A4D is packaged in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, with exposed pad not present. Pin functions are electrically identical across gain variants; NC pin (Pin 4) has no internal connection and may be left floating or tied to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A4DR and INA282AIDR, the INA240A4D uniquely combines 200× gain, –4 V to 80 V common-mode range, and hardware-level PWM transient suppression - making it irreplaceable in high-dV/dt bidirectional sensing where signal integrity and speed are non-negotiable.

Availability

INA240A4D is available at Aetrix Electronics and suitable for motor controls, solenoid valve systems, and telecom power management requiring stable component supply across extended temperature and high-reliability industrial cycles.

Supply support for INA240A4D 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-accuracy, high-noise industrial current sensing - targeting motor drives, solenoid controls, and power conversion systems demanding robustness against fast common-mode transients.

FAQ

What is the maximum common-mode voltage the INA240A4D can handle?

The INA240A4D supports a common-mode input voltage range of –4 V to 80 V, as specified in TI's SBOS662C datasheet Section 7.3. This allows operation below ground during inductive flyback events and high-side sensing on 48-V or 60-V bus systems. The –4 V rating is critical for solenoid and relay driver applications where negative voltage spikes occur during turn-off.

Does the INA240A4D require external calibration for offset drift over temperature?

No. The INA240A4D uses a zero-drift architecture with ±250 nV/°C maximum offset drift across –40°C to +125°C (Section 7.5). This eliminates the need for system-level calibration or software compensation in industrial temperature environments, ensuring consistent 0.25% full-scale accuracy without runtime correction routines.

Can the INA240A4D measure bidirectional current without external components?

Yes. The INA240A4D supports true bidirectional sensing using its dual reference pins (REF1 and REF2). By tying both to a mid-rail voltage (e.g., 2.5 V), the output centers at that voltage - producing positive output for current in one direction and negative relative to center for reverse current. No external op-amps or resistive dividers are required.

What is the purpose of the NC pin on the INA240A4D SOIC package?

Pin 4 on the INA240A4D (SOIC-8) is labeled NC (no internal connection). As confirmed in TI's SBOS662C datasheet Section 6, it has no electrical function. It may be left floating or connected to GND for mechanical stability during PCB assembly - but must never be driven or biased externally.

How does the enhanced PWM rejection in the INA240A4D differ from standard CMRR?

Standard CMRR (e.g., 132 dB DC) rejects static common-mode errors, while enhanced PWM rejection actively suppresses fast ΔV/Δt transients (e.g., >100 V/µs) associated with PWM edge transitions. As shown in Figures 7-21/7-22 of SBOS662C, this hardware-level feature minimizes output ringing and recovery time - unlike passive filtering, it preserves bandwidth and step response fidelity.