Texas Instruments INA241A4IDGKR

Overview

INA241A4IDGKR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-voltage switching systems, featuring 100V/V fixed gain, −5V to 110V operational common-mode range, ±0.015% max gain error, ±10µV max input offset voltage, and enhanced PWM rejection up to 125kHz - deployed in motor drive inline current monitoring where precision under fast transients is critical.

For engineers reviewing the INA241A4IDGKR datasheet, INA241A4IDGKR pinout, INA241A4IDGKR application, or INA241A4IDGKR equivalent, this page delivers verified technical context, package-specific pin functions, real-world use-value metrics, and validated alternative options for high-side/low-side bidirectional sensing in industrial power electronics.

Technical Context

The INA241A4IDGKR implements a zero-drift, multistage amplifier architecture with integrated enhanced PWM rejection circuitry that holds output for 1µs during large ΔV/Δt common-mode transients (e.g., MOSFET switching edges), then relies on 1.1MHz bandwidth and 89dB AC-CMRR at 1MHz to suppress residual disturbance. Its input bias current remains constant at 35µA (typ) across −20V to 120V survival common-mode range - independent of V_CM.

This device operates from 2.7V–20V supply, draws 2.5mA quiescent current, and delivers rail-to-rail output swing (within 20mV of GND and 200mV below V_S) while maintaining 166dB DC-CMRR and ±0.1µV/°C offset drift - enabling accurate bidirectional current measurement across −40°C to +125°C without external calibration.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3mm × 4.9mm body, 0.65mm pitch, exposed thermal pad (not electrically connected), RoHS-compliant, moisture sensitivity level 2a.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA241A4IDGKR, INA240A4IDR trades 15× higher gain error and missing PWM rejection for ~30% lower unit cost, while AD8210WYRZ-RL offers automotive qualification but sacrifices 45V common-mode headroom and 6× worse offset stability - making INA241A4IDGKR the sole option for precision 100V-class bidirectional sensing with transient immunity.

Availability

INA241A4IDGKR is available at Aetrix Electronics and suitable for motor drives, solenoid actuators, drone propulsion systems, and cordless power tools requiring stable component supply, long-term production continuity, and guaranteed traceable sourcing.

Supply support for INA241A4IDGKR 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 high-reliability power management ICs.

The INA241x product line was designed specifically for high-voltage, high-dynamic-range current sensing in next-generation motor control, energy storage, and industrial automation systems demanding sub-µV offset stability and robustness against fast common-mode transients.

FAQ

What is the maximum common-mode voltage the INA241A4IDGKR can withstand continuously?

The INA241A4IDGKR supports continuous operation from −5V to 110V common-mode voltage. Its survival rating extends to −20V to 120V, meaning it tolerates brief transients beyond the operational range without damage - critical for 48V/60V bus systems with switching noise spikes. This specification is validated across temperature and supply conditions per TI SBOSA30D datasheet Section 6.1.

Does the INA241A4IDGKR require external components for basic operation?

Yes - the INA241A4IDGKR requires a minimum 1µF ceramic decoupling capacitor between V_S and GND placed within 5mm of the pins to maintain PWM rejection integrity. REF1 and REF2 must be configured (e.g., one tied to V_S, one to GND for bidirectional mode) and NC (Pin 4) must be grounded. No external gain-setting resistors are needed since gain is fixed at 100V/V.

Can the INA241A4IDGKR measure current in both directions with a single supply?

Yes - the INA241A4IDGKR supports true bidirectional sensing with a single 2.7V–20V supply by configuring REF1 and REF2 to set the output midpoint. For example, connecting REF1 to V_S and REF2 to GND centers the output at V_S/2, enabling ±5A measurement as 0.5V–9.5V output on a 10V supply - all without dual supplies or level-shifting circuitry.

How does the enhanced PWM rejection in the INA241A4IDGKR differ from standard CMRR?

Standard CMRR measures steady-state rejection of common-mode voltage, while enhanced PWM rejection in the INA241A4IDGKR actively suppresses fast ΔV/Δt transients (up to 125kHz) via internal timing circuitry that holds output for 1µs during edge events. This complements - rather than replaces - its 166dB DC-CMRR and 89dB AC-CMRR at 1MHz, providing layered immunity against gate-driver noise that standard CMRR alone cannot address.

Is the INA241A4IDGKR pin-compatible with other INA241x variants?

Yes - all INA241x devices (A1–A5, B1–B5) in VSSOP-8 (DGK) packaging share identical pinout and footprint, including INA241A4IDGKR. Gain and precision grade (A/B) are determined solely by internal trimming; no PCB changes are needed when upgrading from INA241A2IDGKR to INA241A4IDGKR or swapping between A/B versions - only schematic-level gain scaling adjustments may be required.