Texas Instruments INA241A2IDGKR

Overview

INA241A2IDGKR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-voltage switching systems. It operates across −5V to 110V common-mode voltage, delivers 20V/V fixed gain, achieves ±0.01% max gain error and ±10µV max offset voltage, and supports PWM rejection up to 125kHz - enabling accurate inline motor-phase current measurement in 48V industrial drives.

For engineers reviewing the INA241A2IDGKR datasheet, INA241A2IDGKR pinout, INA241A2IDGKR application, or INA241A2IDGKR equivalent, this page provides verified technical context, validated pin functions, confirmed application use cases in solenoid control and drone ESCs, and two rigorously cross-checked alternative parts with documented functional differences.

Technical Context

The INA241A2IDGKR uses a zero-drift, multistage architecture to maintain 1.1MHz bandwidth and 8V/µs slew rate at 20V/V gain while rejecting fast ΔV/Δt common-mode transients - critical for PWM-driven motor phases where VCM swings from −5V to 110V at >100kHz. Its input bias current remains constant (35µA typ) across the full common-mode range, unlike voltage-dependent alternatives.

Enhanced PWM rejection holds output stable for 1µs after each common-mode edge, then relies on 104dB AC-CMRR at 100kHz and high bandwidth to suppress residual disturbance - eliminating need for external filtering in compact ESC layouts. Reference pins (REF1/REF2) enable precise mid-supply or rail-referenced output configuration without external op-amps.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3mm × 4.9mm body, 0.65mm pitch, exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A2IDR and MAX40056ASA+T, the INA241A2IDGKR uniquely combines 110V V_CM, 125kHz PWM rejection, and ±10µV offset - making it the only option for high-accuracy, high-voltage, high-frequency current sensing without signal conditioning.

Availability

INA241A2IDGKR is available at Aetrix Electronics and suitable for motor drives, solenoid control, and drone ESC designs requiring stable component supply, long-term production continuity, and guaranteed TI original packaging.

Supply support for INA241A2IDGKR 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 chain solutions.

The INA241x family was designed specifically for high-voltage, high-speed bidirectional current sensing in next-generation motor control, power tool, and industrial automation systems demanding ultra-low drift and robust PWM immunity.

FAQ

What is the maximum common-mode voltage the INA241A2IDGKR can handle during normal operation?

The INA241A2IDGKR supports an operational common-mode input range of −5V to 110V. This allows direct high-side sensing on 48V, 60V, or even 96V bus systems without external level-shifting circuitry. Its survival rating extends to −20V to 120V, providing margin against transients like load dump or inductive kickback in industrial environments. The INA241A2IDGKR maintains specified performance across this full range.

Does the INA241A2IDGKR require external components for basic operation?

No, the INA241A2IDGKR operates with only a supply decoupling capacitor (1µF ceramic) on the V_S pin and proper grounding of the NC pin to GND. Unlike many current sense amplifiers, it does not require external gain-setting resistors (gain is fixed at 20V/V), offset nulling circuitry, or common-mode filters - thanks to its integrated zero-drift core and enhanced PWM rejection. The INA241A2IDGKR achieves full functionality with minimal external parts.

How does the INA241A2IDGKR achieve 125kHz PWM rejection?

The INA241A2IDGKR implements proprietary enhanced PWM rejection via a dual-stage architecture: first, it holds the output stable for 1µs after each common-mode edge to block initial transient propagation; second, it leverages 104dB AC-CMRR at 100kHz and 1.1MHz bandwidth to attenuate residual disturbances. This eliminates the need for external RC filters or chokes typically required by conventional amplifiers like the INA240 series. The INA241A2IDGKR delivers clean output even under aggressive 125kHz switching conditions.

Can the INA241A2IDGKR measure bidirectional current without external circuitry?

Yes. The INA241A2IDGKR supports true bidirectional current sensing using its dual reference inputs (REF1 and REF2). By connecting REF1 to V_S and REF2 to GND, the output centers at V_S/2 - allowing positive current to produce output above mid-supply and negative current below. No external op-amps, level-shifters, or resistor dividers are needed. This reference configuration is fully supported and characterized in the INA241A2IDGKR datasheet.

What is the thermal performance of the INA241A2IDGKR in VSSOP-8 package?

In the DGK (VSSOP-8) package, the INA241A2IDGKR has a junction-to-ambient thermal resistance (R_θJA) of 167.2°C/W and a junction-to-board resistance (R_θJB) of 88.9°C/W. With 2.5mA quiescent current, self-heating is minimal (<0.5°C rise at 25°C ambient), but PCB copper pour under the exposed pad significantly improves heat dissipation. The INA241A2IDGKR maintains full specifications from −40°C to 125°C ambient, validated across all operating conditions.