Texas Instruments INA241B1QDGKRQ1

Overview

INA241B1QDGKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (−40°C to 125°C) bidirectional current sense amplifier optimized for high-voltage motor control and power conversion systems. It delivers ±0.1% max gain error, ±150µV max input offset voltage, 1.1MHz bandwidth, −5V to 110V common-mode input range, and enhanced PWM rejection up to 125kHz - enabling precise inline current monitoring in electric power steering and regenerative braking circuits.

For engineers reviewing the INA241B1QDGKRQ1 datasheet, INA241B1QDGKRQ1 pinout, INA241B1QDGKRQ1 application, or INA241B1QDGKRQ1 equivalent, key selection criteria include its 10V/V fixed gain, VSSOP-8 package with integrated reference pins (REF1/REF2), ultra-low 1µs 1% settling time, and automotive-grade functional safety documentation support.

Technical Context

The INA241B1QDGKRQ1 employs a zero-drift, multistage amplifier topology with dedicated PWM rejection circuitry that holds output for 1µs during large ΔV/Δt common-mode transients (e.g., MOSFET switching edges), then relies on 104dB AC-CMRR at 100kHz and 1.1MHz bandwidth for subsequent attenuation. Its input stage operates independently of supply voltage, supporting common-mode voltages beyond VS (up to 110V vs. 2.7–20V supply).

It features dual reference inputs (REF1, REF2) enabling programmable output offset from 0V to VS, and uses a precision resistor divider network internally referenced to those pins - allowing rail-to-rail output swing (VS − 0.2V min) while maintaining bidirectional measurement capability across −5V to 110V common-mode range.

Key Specifications

Pinout & Package

VSSOP-8 package (DGK): 3mm × 4.9mm body, 0.65mm pitch, exposed thermal pad (not electrically connected). Pin 4 (NC) must be grounded per datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional current sensing applications.

Compared with INA241B1QDGKRQ1, INA240A1QDGKRQ1 trades 3× higher gain error and missing PWM rejection for lower unit cost, while MAX40056ATA+T offers higher bandwidth but sacrifices automotive compliance and high-voltage common-mode capability - making INA241B1QDGKRQ1 the only option meeting AEC-Q100 Grade 1, 110V CM, and 125kHz PWM rejection simultaneously.

Availability

INA241B1QDGKRQ1 is available at Aetrix Electronics and suitable for electric power steering (EPS), eTurbo control, and regenerative braking systems requiring stable component supply across automotive production lifecycles.

Supply support for INA241B1QDGKRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and power management ICs.

The INA241x-Q1 product line was designed specifically for high-precision, high-CMRR current sensing in AEC-Q100-compliant automotive powertrain and chassis systems - emphasizing PWM noise immunity, wide temperature operation, and functional safety readiness.

FAQ

What is the maximum common-mode voltage the INA241B1QDGKRQ1 can withstand continuously?

The INA241B1QDGKRQ1 supports continuous operation from −5V to 110V common-mode input voltage. Its survival rating extends to −20V to 120V, meaning it tolerates brief transients beyond operational limits without damage. This enables direct high-side sensing in 48V and 60V automotive systems without external protection circuitry - a key requirement for eTurbo and starter/generator applications where bus voltage spikes exceed nominal rails.

Does the INA241B1QDGKRQ1 require external calibration for offset and gain error?

No, the INA241B1QDGKRQ1 does not require external calibration. Its ±0.1% maximum gain error and ±150µV maximum input offset voltage are factory-trimmed and specified over −40°C to 125°C. The zero-drift architecture ensures offset drift remains ≤±0.5µV/°C, eliminating system-level recalibration needs in EPS or braking modules where thermal cycling occurs frequently.

How does the enhanced PWM rejection in the INA241B1QDGKRQ1 improve measurement accuracy in motor drives?

The INA241B1QDGKRQ1's enhanced PWM rejection blocks output disturbance for 1µs during large common-mode transients (e.g., MOSFET turn-on edges), then attenuates residual noise via 104dB AC-CMRR at 100kHz. In a 125kHz PWM-driven EPS inverter, this reduces current measurement RMS error from >2.5% (with standard amplifiers) to <0.8%, enabling tighter torque control loops and smoother assist response.

Can the INA241B1QDGKRQ1 be used for bidirectional current sensing with a single supply?

Yes, the INA241B1QDGKRQ1 supports true bidirectional sensing with a single 2.7V–20V supply by configuring REF1 and REF2 to set output midpoint voltage. For example, tying REF1 to VS and REF2 to GND produces a VS/2-centered output, allowing negative current flow to generate outputs below VS/2 and positive flow above - essential for regenerative braking energy flow monitoring without dual supplies.

What is the thermal performance of the INA241B1QDGKRQ1 in VSSOP-8 (DGK) package at 125°C ambient?

In the VSSOP-8 (DGK) package, the INA241B1QDGKRQ1 has a junction-to-ambient thermal resistance (RθJA) of 167.2°C/W. At 125°C ambient and 2.5mA quiescent current (5V supply), power dissipation is ~12.5mW, resulting in ~2.1°C junction rise - well within the 150°C max junction limit. No heatsinking is required for standard automotive under-hood deployment.