Texas Instruments INA241A3IDGKR

Overview

INA241A3IDGKR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-voltage switching systems, featuring 50V/V fixed gain, −5V to 110V operational common-mode range, ±10µV max input offset voltage, ±0.01% max gain error, and enhanced PWM rejection up to 125kHz - deployed in motor drives and drone propeller control for accurate inline current monitoring under fast transients.

For engineers reviewing the INA241A3IDGKR datasheet, INA241A3IDGKR pinout, INA241A3IDGKR application, or INA241A3IDGKR equivalent, this page delivers verified specifications, package-validated pin functions, real-world use cases in bidirectional power stages, and two confirmed alternative parts with documented technical and application-level differences.

Technical Context

The INA241A3IDGKR uses a zero-drift, high-CMRR architecture with dedicated enhanced PWM rejection circuitry that holds output for 1µs during large ΔV/Δt common-mode transients (e.g., MOSFET switching), then relies on 1.1MHz bandwidth and 104dB AC-CMRR at 100kHz to suppress residual disturbance. Its input bias current remains constant at 35µA (typ) across −20V to 120V survival common-mode range.

It supports bidirectional sensing via dual reference pins (REF1/REF2), enabling mid-supply output offset for symmetric current measurement, and operates from 2.7V–20V supply while drawing only 2.5mA quiescent current - all specified over −40°C to +125°C ambient temperature.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3mm × 4.9mm body, 0.65mm pitch, exposed thermal pad (not electrically connected), RoHS-compliant, rated for −40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3IDR and MAX40056ATA+T, the INA241A3IDGKR delivers superior PWM rejection, tighter DC accuracy, and flexible bidirectional output configuration - making it optimal for next-generation high-frequency motor control and safety-critical medical tools where signal integrity is non-negotiable.

Availability

INA241A3IDGKR is available at Aetrix Electronics and suitable for motor drives, drone propulsion systems, and medical cordless tools requiring stable component supply, long-term production continuity, and guaranteed traceability.

Supply support for INA241A3IDGKR 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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision signal chain and power management ICs.

The INA241x product line was designed specifically for high-accuracy, high-speed current sensing in harsh-switching environments - targeting EV traction inverters, industrial servo drives, and portable power tools demanding ultra-stable gain and offset over temperature and voltage.

FAQ

What is the maximum common-mode voltage the INA241A3IDGKR can withstand continuously?

The INA241A3IDGKR supports an operational common-mode input range of −5V to 110V, meaning it functions correctly across that span during normal operation. Its survival rating extends to −20V to 120V, allowing brief exposure to transients beyond the operational limit without damage - critical for handling inductive kickback in solenoid drivers. This specification is validated per TI's SBOSA30D datasheet Section 6.1.

Does the INA241A3IDGKR require external components for basic operation?

No, the INA241A3IDGKR operates with only a 100nF ceramic bypass capacitor on the VS pin and proper grounding of the NC pin to GND. Unlike legacy current sense amplifiers, it needs no external gain-setting resistors (gain is fixed at 50V/V), no offset trim circuitry (zero-drift architecture), and no RC filters for PWM rejection - simplifying layout and reducing bill-of-materials cost in motor control PCBs.

How does the enhanced PWM rejection in the INA241A3IDGKR improve system reliability?

The enhanced PWM rejection in the INA241A3IDGKR combines 1µs output hold during large ΔV/Δt transients with 104dB AC-CMRR at 100kHz, preventing false overcurrent triggers in motor drives and ESCs. This eliminates erroneous shutdowns caused by gate-driver noise - directly improving mean time between failures (MTBF) in drone propulsion and industrial automation systems using the INA241A3IDGKR.

Can the INA241A3IDGKR measure bidirectional current without external circuitry?

Yes. The INA241A3IDGKR natively supports bidirectional current sensing using its dual reference inputs (REF1 and REF2). By connecting REF1 to VS and REF2 to GND, the output centers at VS/2 - enabling positive and negative current representation around mid-supply. This eliminates the need for external op-amps or level-shifters required by older amplifiers like the INA138, streamlining design for battery charge/discharge monitoring.

What is the thermal performance of the INA241A3IDGKR in VSSOP-8 package?

In the DGK (VSSOP-8) package, the INA241A3IDGKR has a junction-to-ambient thermal resistance (RθJA) of 167.2°C/W and junction-to-board (RθJB) of 88.9°C/W. At 2.5mA quiescent current and 5V supply, power dissipation is ~12.5mW - resulting in <2.1°C junction rise above ambient in typical 2-layer PCB layouts, ensuring stable operation across −40°C to +125°C without heatsinking.