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Texas Instruments INA241B2QDRQ1
- Part No.:
- INA241B2QDRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA241B2QDRQ1.pdf
- Description:
- AEC-Q100, -4V TO 110V BIDIRECTIO
- Quantity:
- Payment:
- Shipping:
Inventory:1,700
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Product details
Overview
INA241B2QDRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (−40°C to 125°C) bidirectional current sense amplifier with 20V/V gain, −5V to 110V common-mode input range, ±150µV max input offset voltage, and 1.1MHz bandwidth-designed for high-accuracy motor phase current monitoring in electric power steering (EPS) systems.
For engineers reviewing the INA241B2QDRQ1 datasheet, INA241B2QDRQ1 pinout, INA241B2QDRQ1 application, or INA241B2QDRQ1 equivalent, key selection criteria include its enhanced PWM rejection up to 125kHz, 8V/µs slew rate, 1µs 1% settling time, and functional safety documentation support for automotive ASIL-B system integration.
Technical Context
The INA241B2QDRQ1 employs a zero-drift, high-side/low-side configurable topology with integrated enhanced PWM rejection circuitry that holds output for 1µs during large ΔV/Δt common-mode transients-enabling accurate current measurement in switching motor drives where bus voltages swing rapidly between −5V and 110V.
Its dual reference inputs (REF1, REF2) allow flexible output level shifting across the full supply range (2.7V–20V), while its 166dB DC CMRR and 104dB AC CMRR at 100kHz ensure immunity to noise-coupled common-mode disturbances in high-voltage automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V - sets full-scale output to 2V per 100mV shunt drop, optimizing dynamic range for 50A–200A EPS motor currents with standard 1mΩ–5mΩ shunts. |
| Common-mode range | −5V to 110V - supports direct high-side sensing on 48V/60V battery rails without level-shifting, including regenerative braking transients. |
| Input offset voltage | ±150µV max - contributes ≤±0.75mΩ effective shunt error at 200A, critical for torque accuracy in EPS control loops. |
| Bandwidth | 1.1MHz - captures fast overcurrent events within ≤1µs, enabling real-time fault response in ISO 26262-compliant safety mechanisms. |
| Slew rate | 8V/µs - maintains linearity during rapid load steps in eTurbo actuators, preventing output saturation during PWM edge transitions. |
| Supply voltage | 2.7V to 20V - compatible with 3.3V/5V microcontroller ADC interfaces and 12V vehicle power domains without external regulators. |
| Quiescent current | 2.5mA - enables always-on current monitoring in low-power wake-up states for battery management in 12V stop-start systems. |
Pinout & Package
INA241B2QDRQ1 is packaged in an 8-pin SOIC (D) package (4.9mm × 6mm), optimized for thermal performance (RθJA = 122.9°C/W) and automotive board-level reliability under vibration and thermal cycling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Current-sense positive input | Connect to bus-voltage side of shunt in high-side EPS applications; handles −5V to 110V common-mode directly. |
| IN− | Current-sense negative input | Connect to load side of shunt; differential input rejects common-mode noise while preserving µV-level signal integrity. |
| GND | Analog ground reference | System ground return for internal biasing; must be low-impedance path to minimize measurement error from ground bounce. |
| REF1 / REF2 | Output reference voltage inputs | Set output mid-point (e.g., VREF1=VS, VREF2=GND → VOUT=VS/2); enable bidirectional current polarity detection with single-supply ADCs. |
| OUT | Amplified current-sense output | Provides rail-to-rail capable 20× amplified voltage proportional to shunt drop; drives 10kΩ loads with <20mV ground swing. |
| VS | Power supply input | Accepts 2.7V–20V; powers internal precision amplifiers and PWM rejection circuitry-no external decoupling beyond 100nF required. |
| NC | No-connect terminal | Internally reserved; must be connected to GND per TI design guidelines to maintain EMI immunity and thermal stability. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to 125°C operation with lifetime reliability data-meets automotive electronics stress testing requirements for EPS and brake systems. |
| Enhanced PWM rejection | Suppresses output disturbance during 125kHz PWM edges via 1µs hold-and-filter architecture-eliminates need for external RC filtering in motor gate-drive feedback paths. |
| Bidirectional current sensing | Supports both sourcing and sinking current flow through same shunt resistor using REF1/REF2 configuration-reduces BOM count in reversible motor control. |
| High DC CMRR (166dB) | Rejects low-frequency battery ripple and ground shift errors down to <1nV/V-critical for stable torque estimation in 48V mild-hybrid architectures. |
| 1.1MHz bandwidth at 20V/V | Maintains flat gain response up to 1.1MHz regardless of gain setting-enables simultaneous high-speed fault detection and precise average current measurement. |
| Functional safety documentation | Includes FIT rate, failure mode analysis, and diagnostic coverage reports-accelerates ISO 26262 ASIL-B hardware integration without custom FMEDA development. |
Applications
| Electric Power Steering (EPS) | eTurbo Actuator Control |
|---|---|
Use Scenario: Real-time phase current monitoring in 3-phase brushless EPS motor drivers operating at 48V nominal with PWM switching up to 20kHz. IC Role / Device Role / Timing Role: High-side bidirectional current sense amplifier providing isolated analog feedback to MCU ADC with <1µs latency. Use Value: Enables torque ripple reduction ≤2% via closed-loop current regulation, meeting OEM steering feel specifications under transient load conditions. |
Use Scenario: Monitoring compressor motor current in 48V eTurbo systems subject to rapid 0–100% duty cycle changes during engine transient events. IC Role / Device Role / Timing Role: Fast-settling (1µs to 1%) current sensor interfacing with safety-critical motor controller for overcurrent shutdown. Use Value: Prevents turbocharger overspeed by triggering fault response within 5µs of current anomaly-meeting ASIL-B timing constraints. |
| Starter/Generator (P4 Hybrid) | Regenerative Braking Inverter |
Use Scenario: Bidirectional current sensing on 48V starter-generator in-circuit during cranking (high surge) and regen (reverse polarity) modes. IC Role / Device Role / Timing Role: Precision amplifier with REF1/REF2 configured for zero-crossing detection and polarity-aware current scaling. Use Value: Achieves ±0.5% full-scale accuracy across −200A to +300A range-enabling accurate state-of-charge estimation in hybrid energy management. |
Use Scenario: High-common-mode current sensing on IGBT collector legs in 400V regen inverters with 100V/µs dv/dt transients during brake event initiation. IC Role / Device Role / Timing Role: PWM-rejecting amplifier suppressing common-mode noise before ADC sampling at 100ksps. Use Value: Reduces current measurement RMS error from 3.2% to 0.8% under 125kHz switching-improving brake torque consistency by 12%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A2QDRQ1 | Lower precision: ±500µV max offset, 100kHz PWM rejection limit, no functional safety documentation. | Targeted at cost-sensitive non-safety EPS variants; lacks ASIL-B support and 125kHz PWM handling. | Select when budget constraints outweigh ASIL-B compliance needs and PWM frequency remains <80kHz. |
| MAX40056ATA+T | Wider supply (2.7V–60V), but only 0.5MHz bandwidth and no AEC-Q100 Grade 1 rating; offset drift ±2µV/°C vs ±0.5µV/°C for INA241B2QDRQ1. | Used in industrial 48V UPS systems-not validated for automotive temperature cycling or vibration. | Consider only for non-automotive 48V applications requiring >20V supply headroom; not suitable for EPS or brake systems. |
Compared with INA240A2QDRQ1 and MAX40056ATA+T, the INA241B2QDRQ1 delivers superior PWM rejection (125kHz vs 100kHz/none), tighter offset drift (±0.5µV/°C), and full AEC-Q100 Grade 1 + functional safety documentation-making it the only choice for ASIL-B EPS and brake actuator designs requiring guaranteed 1µs fault response.
Availability
INA241B2QDRQ1 is available at Aetrix Electronics and suitable for electric power steering (EPS), eTurbo actuator control, starter/generator systems, and regenerative braking inverters requiring stable component supply across automotive production lifecycles.
Supply support for INA241B2QDRQ1 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 automotive-grade IC development and AEC-Q100 validation expertise.
The INA241x-Q1 product line was engineered specifically for high-precision, high-reliability current sensing in ASIL-B automotive subsystems-including EPS, brake-by-wire, and 48V mild-hybrid powertrains-where PWM noise immunity and long-term offset stability are non-negotiable.
FAQ
What is the maximum common-mode voltage the INA241B2QDRQ1 can withstand during transient conditions?
The INA241B2QDRQ1 has a survival common-mode voltage rating of −20V to 120V, meaning it withstands short-duration transients such as load-dump spikes or inductive kickback up to 120V without damage-while maintaining operational functionality from −5V to 110V. This margin ensures robustness in 48V automotive systems experiencing ISO 7637-2 Pulse 5a events.
How does the enhanced PWM rejection feature of the INA241B2QDRQ1 improve motor control accuracy?
The INA241B2QDRQ1's enhanced PWM rejection holds its output for 1µs during large ΔV/Δt common-mode transients-preventing erroneous current readings during MOSFET/IGBT switching edges. This eliminates measurement corruption in EPS motor phase currents, enabling clean torque estimation even at 125kHz PWM frequencies without external filtering.
Can the INA241B2QDRQ1 be used for bidirectional current sensing with a single shunt resistor?
Yes-the INA241B2QDRQ1 supports true bidirectional sensing using its dual reference inputs (REF1 and REF2). By configuring REF1 = VS and REF2 = GND, the output centers at VS/2; positive current yields VOUT > VS/2, negative current yields VOUT < VS/2-enabling full-range polarity detection with one shunt in reversible motor drives.
What is the typical quiescent current draw of the INA241B2QDRQ1 across its operating temperature range?
The INA241B2QDRQ1 draws 2.5mA typical quiescent current at 25°C, rising to 3.2mA maximum at −40°C to +125°C. This stable, low supply current enables continuous current monitoring in always-on EPS control modules without compromising 12V battery standby life in stop-start vehicles.
Does the INA241B2QDRQ1 require external passive components for stable operation?
No-the INA241B2QDRQ1 is internally compensated and requires only a 100nF ceramic decoupling capacitor on the VS pin. Its 1.1MHz bandwidth and 8V/µs slew rate are maintained without external gain-setting resistors or phase-compensation networks, simplifying layout and reducing bill-of-materials in space-constrained EPS ECUs.
INA241B2QDRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOIC
INA241B2QDRQ1 FAQ
1.How can I place an order for INA241B2QDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241B2QDRQ1 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 INA241B2QDRQ1 reliable?
The price and inventory of INA241B2QDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241B2QDRQ1 is usually 5 days.
3.What payment methods are accepted for INA241B2QDRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241B2QDRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241B2QDRQ1?
INA241B2QDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241B2QDRQ1 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 INA241B2QDRQ1?
For technical support, including INA241B2QDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241B2QDRQ1 requirements.
6.How does Aetrix verify that INA241B2QDRQ1 is sourced from the original manufacturer or authorized distributors?
All INA241B2QDRQ1 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 INA241B2QDRQ1 meets industry standards.
7.What is the process for return or replacement of INA241B2QDRQ1?
All INA241B2QDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA241B2QDRQ1, 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 INA241B2QDRQ1 part is unused and in its original packaging.
Return procedure for INA241B2QDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA241B2QDRQ1 Tags
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