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Texas Instruments INA241B2QDDFRQ1
- Part No.:
- INA241B2QDDFRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
INA241B2QDDFRQ1.pdf
- Description:
- AEC-Q100 -4V TO 110V BIDIRECTIO
- Quantity:
- Payment:
- Shipping:
Inventory:2,925
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Product details
Overview
INA241B2QDDFRQ1 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 regenerative braking 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 shunt-based current measurement in eTurbo, EPS, and starter/generator inverters.
For engineers reviewing the INA241B2QDDFRQ1 datasheet, INA241B2QDDFRQ1 pinout, INA241B2QDDFRQ1 application, or INA241B2QDDFRQ1 equivalent, this page provides verified technical context, validated pin functions for SOT-23-8 package, real-world automotive use cases, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The INA241B2QDDFRQ1 implements a zero-drift, high-side/low-side/bidirectional current sensing architecture with integrated PWM rejection circuitry that holds output for 1µs during large ΔV/Δt common-mode transients - suppressing disturbance propagation from switching nodes. Its multistage amplifier design maintains 1.1MHz bandwidth across all gains while delivering 166dB DC-CMRR and 104dB AC-CMRR at 100kHz.
It operates from 2.7V–20V supply, draws 2.5mA quiescent current, supports reference-adjustable output via REF1/REF2 pins, and survives −20V to 120V common-mode voltage. The device is qualified per AEC-Q100 Grade 1 and includes functional safety documentation support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V - sets full-scale output to 20× sensed differential voltage across shunt; enables 50mV full-scale current sensing with 1V output swing. |
| Common-Mode Range | −5V to 110V - supports high-side sensing above supply rail and low-side sensing near ground in 48V/60V automotive systems. |
| Bandwidth | 1.1MHz - ensures accurate capture of fast overcurrent events in motor phase currents with ≤1µs 1% settling time. |
| Input Offset Voltage | ±150µV max - limits worst-case current measurement error to ±1.5mV at 10mΩ shunt, critical for torque accuracy in EPS. |
| CMRR | 130dB min (DC), 104dB at 100kHz - rejects noise from adjacent high-dv/dt power switches in inverter half-bridges. |
| Supply Voltage | 2.7V to 20V - compatible with 3.3V/5V logic domains and direct connection to 12V/24V vehicle battery rails. |
| PWM Rejection | Up to 125kHz - suppresses output disturbance from gate driver switching edges, eliminating need for external filtering in SiC/GaN inverter designs. |
Pinout & Package
INA241B2QDDFRQ1 is packaged in DDF (SOT-23-8), a 2.9mm × 2.8mm surface-mount package with exposed pad for thermal performance in automotive under-hood environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (Pin 1) | Current-sense negative input | Connect to load side (high-side) or ground side (low-side) of shunt; handles −5V to 110V common-mode voltage. |
| GND (Pin 2) | Ground reference | System ground return for internal circuitry; must be low-impedance path to minimize measurement error. |
| REF2 (Pin 3) | Reference input 2 | Adjusts output baseline; connect to 0V–VS to set bidirectional zero-current output level (e.g., VS/2 = 0A). |
| NC (Pin 4) | No-connect terminal | Reserved pin; must be connected to GND per datasheet to ensure stable operation and EMI performance. |
| OUT (Pin 5) | Analog output | Voltage output = G × (IN+ − IN−) + (REF1 + REF2)/2; drives ADC inputs or comparator thresholds directly. |
| VS (Pin 6) | Power supply | 2.7V–20V analog supply; decoupling capacitor required within 1cm of pin to maintain PSRR and transient response. |
| REF1 (Pin 7) | Reference input 1 | Paired with REF2 to define output common-mode level; enables ratiometric or offset-adjusted current readout. |
| IN+ (Pin 8) | Current-sense positive input | Connect to bus-voltage side (high-side) or load side (low-side) of shunt; matches IN− in voltage rating and bias behavior. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to 125°C ambient operation in safety-critical automotive subsystems including EPS and brake control. |
| Enhanced PWM rejection | 1µs output hold + high AC-CMRR attenuates common-mode transients up to 125kHz, eliminating post-filtering in inverter current loops. |
| Bidirectional sensing | Supports regenerative braking and motoring modes with single-shunt topology; output polarity follows current direction relative to REF settings. |
| Ultra-precise DC accuracy | ±0.1% gain error and ±150µV offset enable <0.5% total current measurement error over temperature without calibration. |
| High-speed response | 1.1MHz bandwidth and 1µs 1% settling time allow real-time overcurrent detection and protection within motor control PWM periods. |
Applications
| eTurbo / Electric Turbocharger | Electric Power Steering (EPS) |
|---|---|
Use Scenario: Real-time phase current monitoring in 48V eTurbo inverter driving a high-speed BLDC motor. IC Role / Device Role / Timing Role: High-side bidirectional current sense amplifier measuring shunt voltage with 125kHz PWM rejection to suppress gate-driver noise. Use Value: Enables precise torque control and overcurrent shutdown within 1µs, preventing IGBT/SiC FET destruction during transient load spikes. |
Use Scenario: Low-side current sensing on EPS motor H-bridge to detect assist torque demand and fault conditions. IC Role / Device Role / Timing Role: Bidirectional amplifier with REF1/REF2 biasing to output centered around 2.5V for 12-bit ADC input. Use Value: Delivers ±1.5mV offset error over −40°C to 125°C, ensuring consistent steering assist accuracy across environmental extremes. |
| Starter/Generator (Bi-directional 48V System) | Regenerative Braking Control |
Use Scenario: Inline current measurement in dual-function 48V starter-generator for engine cranking and energy recovery. IC Role / Device Role / Timing Role: Wide common-mode (−5V to 110V) amplifier supporting both motoring (positive current) and generation (negative current) modes. Use Value: Eliminates need for separate high-side/low-side sensors; single device reduces BOM cost and PCB area by 40% vs discrete solutions. |
Use Scenario: Monitoring battery charge current during regenerative braking in EV traction inverters. IC Role / Device Role / Timing Role: High-bandwidth (1.1MHz), low-drift amplifier capturing rapid current reversals without phase lag or distortion. Use Value: Enables accurate state-of-charge estimation and thermal management by resolving sub-100µs current transients during brake pedal actuation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A2QDGKRQ1 | Same 20V/V gain, but ±0.3% gain error and ±350µV offset; no enhanced PWM rejection circuitry. | Limited to lower-frequency (<50kHz) switching systems; requires external RC filtering for SiC/GaN inverters. | Select when cost sensitivity outweighs PWM noise immunity and DC precision requirements. |
| MAX40056ATA+T | 20V/V gain, ±0.2% gain error, ±125µV offset, but only −0.2V to 65V common-mode range and no AEC-Q100 qualification. | Restricted to low-voltage (≤48V) non-automotive industrial drives; lacks automotive reliability validation and functional safety documentation. | Choose for commercial-grade 24V/48V motor drives where AEC-Q100 and extended voltage range are not required. |
Compared with INA241B2QDDFRQ1, INA240A2QDGKRQ1 trades PWM rejection and DC accuracy for lower cost, while MAX40056ATA+T offers tighter offset but sacrifices automotive qualification and high-voltage capability - making INA241B2QDDFRQ1 the only option meeting full AEC-Q100 Grade 1, 110V CM, and 125kHz PWM rejection simultaneously.
Availability
INA241B2QDDFRQ1 is available at Aetrix Electronics and suitable for electric power steering (EPS), eTurbo control, and regenerative braking systems requiring stable component supply, long-term automotive lifecycle support, and traceable sourcing.
Supply support for INA241B2QDDFRQ1 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 deep expertise in automotive-grade signal conditioning and power management ICs.
The INA241x-Q1 product line was designed specifically for high-reliability, high-precision current sensing in AEC-Q100-compliant automotive electrification systems - including 48V mild-hybrid architectures, EPS, and brake-by-wire controllers.
FAQ
What is the maximum common-mode voltage the INA241B2QDDFRQ1 can withstand?
The INA241B2QDDFRQ1 has a survival common-mode voltage rating of −20V to 120V, and operates continuously over −5V to 110V. This allows safe deployment in 48V and 60V automotive systems where transient spikes exceed nominal bus voltage - such as during load dump or inductive kickback in starter/generator circuits. The INA241B2QDDFRQ1 maintains specified accuracy across its full operational range without derating.
Does the INA241B2QDDFRQ1 support bidirectional current sensing out of the box?
Yes, the INA241B2QDDFRQ1 natively supports bidirectional sensing using its dual reference inputs (REF1 and REF2). By setting REF1 and REF2 to mid-supply (e.g., VS/2), the output centers at that voltage - enabling positive current to produce output above VS/2 and negative current to produce output below VS/2. No external op-amps or level-shifting circuitry is required for true bidirectional operation in the INA241B2QDDFRQ1.
What is the purpose of the NC pin (Pin 4) on the INA241B2QDDFRQ1?
Pin 4 on the INA241B2QDDFRQ1 is designated NC (No Connect) but must be connected to GND per the datasheet. This connection stabilizes internal bias networks, improves EMI immunity, and ensures predictable startup behavior. Leaving Pin 4 floating may cause output instability or increased offset drift - particularly during high-dv/dt transients common in automotive inverter applications.
How does the enhanced PWM rejection in the INA241B2QDDFRQ1 improve system performance?
The INA241B2QDDFRQ1's enhanced PWM rejection uses a combination of 1µs output hold during large common-mode transients and high AC-CMRR (104dB @ 100kHz) to suppress noise coupling from gate drivers. In practice, this eliminates false overcurrent triggers and removes the need for external RC filters - reducing signal latency by >500ns and simplifying PCB layout in SiC-based eTurbo inverters where switching frequencies reach 125kHz.
Is the INA241B2QDDFRQ1 pin-compatible with other devices in the INA241x-Q1 family?
Yes, the INA241B2QDDFRQ1 shares identical pinout and package (DDF/SOT-23-8) with all other INA241x-Q1 variants - including INA241A1QDDFRQ1 through INA241B5QDDFRQ1. This enables drop-in replacement across gain options (10V/V to 200V/V) and precision grades (A/B) without PCB redesign, supporting flexible prototyping and last-minute calibration tuning in automotive production programs.
INA241B2QDDFRQ1 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
INA241B2QDDFRQ1 FAQ
1.How can I place an order for INA241B2QDDFRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241B2QDDFRQ1 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 INA241B2QDDFRQ1 reliable?
The price and inventory of INA241B2QDDFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241B2QDDFRQ1 is usually 5 days.
3.What payment methods are accepted for INA241B2QDDFRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241B2QDDFRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241B2QDDFRQ1?
INA241B2QDDFRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241B2QDDFRQ1 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 INA241B2QDDFRQ1?
For technical support, including INA241B2QDDFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241B2QDDFRQ1 requirements.
6.How does Aetrix verify that INA241B2QDDFRQ1 is sourced from the original manufacturer or authorized distributors?
All INA241B2QDDFRQ1 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 INA241B2QDDFRQ1 meets industry standards.
7.What is the process for return or replacement of INA241B2QDDFRQ1?
All INA241B2QDDFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA241B2QDDFRQ1, 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 INA241B2QDDFRQ1 part is unused and in its original packaging.
Return procedure for INA241B2QDDFRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA241B2QDDFRQ1 Tags
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