Texas Instruments INA240A4DR

Overview

INA240A4DR from Texas Instruments is a bidirectional, ultra-precise current-sense amplifier optimized for high-noise PWM environments, featuring 200 V/V fixed gain, –4 V to 80 V common-mode input range, ±25 μV max offset voltage, and 93-dB AC CMRR at 50 kHz - deployed in motor control feedback loops for accurate phase-current monitoring under fast-switching conditions.

For engineers reviewing the INA240A4DR datasheet, INA240A4DR pinout, INA240A4DR application, or INA240A4DR equivalent, this page delivers verified specifications, TSSOP-8 package mapping, real-world use-value context for solenoid and actuator systems, and two validated alternative parts with documented functional trade-offs.

Technical Context

The INA240A4DR implements a zero-drift, chopper-stabilized architecture with integrated enhanced PWM rejection circuitry that suppresses large ΔV/Δt transients before amplification - critical for maintaining output stability during MOSFET gate switching edges in H-bridge motor drives. Its dual-reference-pin (REF1/REF2) configuration enables flexible unidirectional or bidirectional output centering without external op-amps.

It operates from a single 2.7–5.5 V supply, draws ≤2.4 mA quiescent current, and delivers 400 kHz bandwidth with 9.8 µs settling time to 0.5% - supporting rapid overcurrent detection while preserving <0.20% gain error across –40°C to +125°C. Input bias current remains below 90 µA across its full –4 V to 80 V common-mode range.

Key Specifications

Pinout & Package

INA240A4DR is packaged in an 8-pin TSSOP (PW) with 3.00 mm × 4.40 mm body size, optimized for high-density PCB layouts and thermal performance (R_θJA = 149.1°C/W). The package includes exposed thermal pad (not electrically connected) and is RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3DR and MAX40056ASA+T, the INA240A4DR uniquely balances ultra-high gain (200 V/V), industry-leading 93-dB AC CMRR at 50 kHz, and –4 V to 80 V common-mode range - making it the only option that simultaneously minimizes shunt loss *and* eliminates PWM-induced measurement corruption in 48-V industrial motor systems.

Availability

INA240A4DR is available at Aetrix Electronics and suitable for motor controls, solenoid and valve controls, and power management applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial OEM programs.

Supply support for INA240A4DR 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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and communications markets.

The INA240 product line delivers ultra-precise, high-CMRR current-sense amplifiers specifically engineered for noisy switching environments - targeting motor drives, solenoid controls, and power-supply monitoring where PWM rejection and wide common-mode range are non-negotiable.

FAQ

What is the maximum common-mode voltage the INA240A4DR can handle?

The INA240A4DR supports a common-mode input voltage range of –4 V to 80 V. This allows operation below ground during inductive flyback events (e.g., solenoid de-energization) and compatibility with 48-V industrial buses. The specification is guaranteed across the full –40°C to +125°C operating temperature range and is independent of the 2.7–5.5 V supply voltage.

Does the INA240A4DR require external components for PWM rejection?

No, the INA240A4DR integrates enhanced PWM rejection circuitry internally - no external filters, RC networks, or layout tricks are needed to achieve 93-dB AC CMRR at 50 kHz. However, proper PCB layout (short IN+/IN– traces, ground plane under device, 100-nF ceramic decoupling at VS pin within 1 cm) is required to maintain specified performance.

Can the INA240A4DR measure bidirectional current, and how is it configured?

Yes, the INA240A4DR supports bidirectional current sensing via its REF1 and REF2 pins. To configure bidirectional operation, tie REF1 and REF2 together and connect them to a mid-supply voltage (e.g., 2.5 V for 5-V VS). This sets the output midpoint so positive IN+–IN– differential produces upward swing and negative differential produces downward swing - all within the same device.

What is the typical quiescent current of the INA240A4DR, and how does it vary with temperature?

The INA240A4DR draws ≤2.4 mA quiescent current at 25°C and up to 2.6 mA across –40°C to +125°C. At 5 V supply, typical IQ is 1.8 mA at 25°C, rising gradually to ~2.3 mA at 125°C. This low, well-characterized supply current enables reliable use in thermally constrained enclosures and battery-backed industrial sensors without thermal runaway risk.

Is the INA240A4DR pin-compatible with other variants in the INA240 family?

Yes, all INA240 variants - including INA240A1DR, INA240A2DR, INA240A3DR, and INA240A4DR - share identical 8-pin TSSOP (PW) and SOIC (D) packages and pinouts. Gain selection is internal and fixed per part number; no external resistors or configuration pins are required. This enables direct substitution during design iteration or cost optimization without PCB changes.