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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments INA241B3QDDFRQ1

Name: INA241B3QDDFRQ1
Brand: Texas Instruments
SKU: INA241B3QDDFRQ1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: INA241B3QDDFRQ1

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: SOT-23-8 Thin, TSOT-23-8

Datasheet:: INA241B3QDDFRQ1.pdf

Description:: AEC-Q100 -4V TO 110V BIDIRECTIO

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Product details

Overview

INA241B3QDDFRQ1 from Texas Instruments is an AEC-Q100 Grade 0 (−40°C to +150°C) bidirectional current sense amplifier optimized for high-voltage motor control and regenerative braking systems. It delivers 50V/V gain, ±150µV max input offset voltage, 1.1MHz bandwidth, −5V to 110V operational common-mode range, and enhanced PWM rejection up to 125kHz - enabling precise inline current measurement in eTurbo and EPS inverters.

For engineers reviewing the INA241B3QDDFRQ1 datasheet, INA241B3QDDFRQ1 pinout, INA241B3QDDFRQ1 application, or INA241B3QDDFRQ1 equivalent, key selection criteria include its Grade 0 temperature rating, 50V/V fixed gain, SOT-23-8 package with integrated reference pins, and validated performance under fast common-mode transients in automotive traction inverters.

Technical Context

The INA241B3QDDFRQ1 employs a zero-drift, high-common-mode topology with dedicated PWM rejection circuitry that holds output for 1µs during large ΔV/Δt transients and attenuates residual disturbances via 104dB AC-CMRR at 100kHz. Its 50V/V gain is factory-trimmed and stable across temperature.

It operates from 2.7V–20V supply, draws 2.5mA quiescent current, supports bidirectional sensing via differential inputs (IN+, IN−), and uses dual reference pins (REF1, REF2) to set output common-mode level - enabling flexible interfacing with SAR ADCs or isolated amplifiers in high-side configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
Gain	50V/V - fixed, factory-trimmed ratio enabling direct conversion of 20mV shunt drop to 1V output for standard ADC full-scale alignment.
Common-mode range	−5V to 110V - supports high-side sensing in 48V/60V bus systems without level-shifting, even when V_S = 5V.
Offset voltage	±150µV max - ensures ≤3mV error at 20mV full-scale sense voltage, critical for <1% current measurement accuracy.
Bandwidth	1.1MHz - enables detection of sub-microsecond overcurrent events in IGBT/SiC gate driver feedback loops.
CMRR	130dB DC, 104dB @100kHz - suppresses noise coupling from adjacent high-dV/dt power traces in compact motor drive PCBs.
Supply range	2.7V to 20V - compatible with 3.3V logic rails and 12V/15V bias supplies in automotive ECUs.
Temp grade	AEC-Q100 Grade 0 (−40°C to +150°C) - qualified for under-hood EPS and starter-generator junction temperature environments.

Pinout & Package

INA241B3QDDFRQ1 is packaged in an 8-pin SOT-23 (DDF) measuring 2.9mm × 2.8mm, optimized for space-constrained automotive power modules and motor control boards.

Pin/Terminal	Circuit Role	Design Meaning
IN−	Current-sense negative input	Connects to load side of shunt in high-side config or ground side in low-side config; handles −5V to 110V common-mode.
GND	Ground reference	Analog ground return for internal circuitry; must be tied to system power ground with low-inductance path.
REF2	Reference voltage input	Adjusts output common-mode level; connect to 0V–V_S to shift output swing (e.g., 2.5V for 5V ADC interface).
NC	No-connect terminal	Internally reserved; must be connected to GND per datasheet to ensure stability and EMI performance.
OUT	Amplified output	Delivers 50×(V_IN+−V_IN−) + V_REF; rail-to-rail capable with 8V/µs slew rate for fast transient response.
V_S	Power supply	2.7V–20V analog supply; decoupling capacitor (≥1µF ceramic) required within 1mm of pin.
REF1	Reference voltage input	Paired with REF2 to define output midpoint; differential reference configuration improves PSRR and noise immunity.
IN+	Current-sense positive input	Connects to bus-voltage side of shunt in high-side config or load side in low-side config; matched to IN− for CMRR.

Key Features

Feature	Design Value
Enhanced PWM rejection	Suppresses output disturbance during 125kHz PWM edge transitions via 1µs hold + high AC-CMRR, eliminating need for external RC filtering in inverter phase-leg sensing.
Bidirectional operation	Measures current flow in both directions using same shunt resistor - essential for regenerative braking energy monitoring in EV powertrains.
Grade 0 AEC-Q100 qualification	Validated for continuous operation at 150°C ambient, supporting placement near IGBT modules in compact traction inverters without derating.
50V/V precision gain	±0.1% max gain error with ±5ppm/°C drift ensures stable scaling across temperature, reducing calibration overhead in production test.
Dual reference inputs	REF1/REF2 allow programmable output common-mode voltage (0V to V_S), enabling seamless interface with single-supply ADCs or isolated sigma-delta modulators.

Applications

eTurbo / Electric Turbocharger	Electric Power Steering (EPS)
Use Scenario: Real-time phase current monitoring in 48V eTurbo inverter to regulate boost pressure and prevent overspeed. IC Role / Device Role / Timing Role: High-side bidirectional current sense amplifier placed on each motor phase leg, sampling at ≥1MSps to capture rapid torque transients. Use Value: 1.1MHz bandwidth and 1µs settling enable accurate current reconstruction during 20kHz PWM switching, improving field-oriented control (FOC) fidelity.	Use Scenario: Motor current feedback in column-assist EPS systems with integrated 3-phase inverter. IC Role / Device Role / Timing Role: Low-side shunt monitor providing analog current feedback to MCU's ADC for torque loop closure. Use Value: ±150µV offset ensures <0.75% current error at 20mV sense voltage, meeting ISO 26262 ASIL-B torque accuracy requirements.
Starter/Generator (Belt-Driven or P0/P1)	Regenerative Braking System
Use Scenario: Bidirectional current measurement in 48V mild-hybrid starter-generator during cranking and regen modes. IC Role / Device Role / Timing Role: Inline shunt amplifier with REF1/REF2 configured for 2.5V output center-point, feeding 12-bit ADC in power management MCU. Use Value: −5V to 110V common-mode range accommodates reverse battery protection and load dump transients without saturation.	Use Scenario: Monitoring motor current direction and magnitude during coast-down and brake energy recovery in 400V EV drivetrain. IC Role / Device Role / Timing Role: High-side current sensor on inverter DC-link or motor phase, reporting real-time power flow to vehicle controller. Use Value: Grade 0 temperature rating ensures reliable operation at >130°C junction temperatures near IGBT heatsinks during sustained regen events.

eTurbo / Electric Turbocharger

Electric Power Steering (EPS)

Use Scenario: Real-time phase current monitoring in 48V eTurbo inverter to regulate boost pressure and prevent overspeed.

IC Role / Device Role / Timing Role: High-side bidirectional current sense amplifier placed on each motor phase leg, sampling at ≥1MSps to capture rapid torque transients.

Use Value: 1.1MHz bandwidth and 1µs settling enable accurate current reconstruction during 20kHz PWM switching, improving field-oriented control (FOC) fidelity.

Use Scenario: Motor current feedback in column-assist EPS systems with integrated 3-phase inverter.

IC Role / Device Role / Timing Role: Low-side shunt monitor providing analog current feedback to MCU's ADC for torque loop closure.

Use Value: ±150µV offset ensures <0.75% current error at 20mV sense voltage, meeting ISO 26262 ASIL-B torque accuracy requirements.

Starter/Generator (Belt-Driven or P0/P1)

Regenerative Braking System

Use Scenario: Bidirectional current measurement in 48V mild-hybrid starter-generator during cranking and regen modes.

IC Role / Device Role / Timing Role: Inline shunt amplifier with REF1/REF2 configured for 2.5V output center-point, feeding 12-bit ADC in power management MCU.

Use Value: −5V to 110V common-mode range accommodates reverse battery protection and load dump transients without saturation.

Use Scenario: Monitoring motor current direction and magnitude during coast-down and brake energy recovery in 400V EV drivetrain.

IC Role / Device Role / Timing Role: High-side current sensor on inverter DC-link or motor phase, reporting real-time power flow to vehicle controller.

Use Value: Grade 0 temperature rating ensures reliable operation at >130°C junction temperatures near IGBT heatsinks during sustained regen events.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
INA240A3QDDFRQ1	Same 50V/V gain and SOT-23-8 package, but Grade 1 (−40°C to +125°C); ±10µV max offset; no enhanced PWM rejection circuitry.	Limited to under-dash ECUs or lower-temperature motor control zones; insufficient for direct placement near high-power inverters.	Select when ambient temperature stays ≤125°C and PWM rejection is handled externally via layout or filtering.
MAX40056ATA+T	50V/V gain, SOIC-8, Grade 0, but only unidirectional; 1.5MHz bandwidth; ±125µV offset; no dual reference inputs.	Requires separate high/low-side sensors for bidirectional measurement; lacks REF1/REF2 flexibility for ADC interfacing.	Choose when unidirectional sensing suffices and board space allows SOIC-8; verify layout isolation for 110V common-mode.

Compared with INA240A3QDDFRQ1 and MAX40056ATA+T, the INA241B3QDDFRQ1 uniquely combines Grade 0 qualification, bidirectional capability, enhanced PWM rejection, and dual reference inputs - making it the only option qualified for direct integration into high-temperature, high-dV/dt automotive traction inverter current loops.

Availability

INA241B3QDDFRQ1 is available at Aetrix Electronics and suitable for electric power steering (EPS), eTurbo control, and regenerative braking systems requiring stable component supply across extended automotive product lifecycles.

Supply support for INA241B3QDDFRQ1 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-grade signal conditioning and power management ICs.

The INA241x-Q1 product line was designed specifically for high-precision, high-reliability current sensing in AEC-Q100-compliant automotive traction inverters, starter-generators, and safety-critical motor control systems.

FAQ

What is the maximum common-mode voltage the INA241B3QDDFRQ1 can withstand during operation?

The INA241B3QDDFRQ1 has an operational common-mode input range of −5V to 110V. Its survival rating extends to −20V to 120V, allowing robust operation during load dump or reverse battery conditions in automotive 48V systems. This specification is validated across the full Grade 0 temperature range (−40°C to +150°C).

Does the INA241B3QDDFRQ1 support bidirectional current sensing, and how is polarity determined?

Yes, the INA241B3QDDFRQ1 supports true bidirectional current sensing. Polarity is determined by the relative voltage at IN+ and IN−: when current flows from IN+ to IN−, the output rises above the reference midpoint set by REF1/REF2; reverse current drives the output below that midpoint. This enables single-shunt measurement of motor regeneration and motoring phases.

What is the purpose of the REF1 and REF2 pins on the INA241B3QDDFRQ1?

The REF1 and REF2 pins on the INA241B3QDDFRQ1 set the output common-mode voltage as V_OUT = 50×(V_IN+−V_IN−) + (V_REF1 + V_REF2)/2. Connecting REF1 and REF2 to defined potentials (e.g., 0V and 5V) centers the output at 2.5V - enabling direct interface with single-supply 5V ADCs without level-shifting circuitry.

How does the enhanced PWM rejection feature of the INA241B3QDDFRQ1 improve system performance?

The enhanced PWM rejection in the INA241B3QDDFRQ1 suppresses output disturbance during fast common-mode transients (up to 125kHz) by holding the output for 1µs and leveraging 104dB AC-CMRR at 100kHz. This eliminates measurement errors during IGBT/SiC switching edges, removing the need for external RC filters and preserving signal integrity in high-frequency motor control loops.

Is the INA241B3QDDFRQ1 pin-compatible with other members of the INA241x-Q1 family?

Yes, the INA241B3QDDFRQ1 shares identical pinout and footprint with all DDF (SOT-23-8) variants of the INA241x-Q1 family, including INA241A3QDDFRQ1 and INA241B1QDDFRQ1. Gain and grade differences are internal; no PCB redesign is needed when upgrading between B-grade variants or changing gain options within the same package.

INA241B3QDDFRQ1 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: SOT-23-8 Thin, TSOT-23-8

Packaging:: Tape & Reel (TR)

Product Status:: Active

Amplifier Type:: Current Sense

Number of Circuits:: 1

Output Type:: Single-Ended

Slew Rate:: 8V/µs

Gain Bandwidth Product:: -

-3db Bandwidth:: 1.1 MHz

Current - Input Bias:: 35 µA

Voltage - Input Offset:: 25 µV

Current - Supply:: 2.5mA

Current - Output / Channel:: -

Voltage - Supply Span (Min):: 2.7 V

Voltage - Supply Span (Max):: 20 V

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: TSOT-23-8

INA241B3QDDFRQ1 FAQ

1.How can I place an order for INA241B3QDDFRQ1 through Aetrix?

Please submit a Request for Quotation (RFQ) for INA241B3QDDFRQ1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for INA241B3QDDFRQ1 reliable?

The price and inventory of INA241B3QDDFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241B3QDDFRQ1 is usually 5 days.

3.What payment methods are accepted for INA241B3QDDFRQ1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241B3QDDFRQ1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for INA241B3QDDFRQ1?

INA241B3QDDFRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your INA241B3QDDFRQ1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for INA241B3QDDFRQ1?

For technical support, including INA241B3QDDFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241B3QDDFRQ1 requirements.

6.How does Aetrix verify that INA241B3QDDFRQ1 is sourced from the original manufacturer or authorized distributors?

All INA241B3QDDFRQ1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that INA241B3QDDFRQ1 meets industry standards.

7.What is the process for return or replacement of INA241B3QDDFRQ1?

All INA241B3QDDFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA241B3QDDFRQ1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The INA241B3QDDFRQ1 part is unused and in its original packaging.

Return procedure for INA241B3QDDFRQ1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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