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Texas Instruments INA241B4IDDFR
- Part No.:
- INA241B4IDDFR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
INA241B4IDDFR.pdf
- Description:
- -5-V TO 110-V BIDIRECTIONAL HIGH
- Quantity:
- Payment:
- Shipping:
Inventory:4,522
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Product details
Overview
INA241B4IDDFR 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, ±150µV 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 INA241B4IDDFR datasheet, INA241B4IDDFR pinout, INA241B4IDDFR application, or INA241B4IDDFR equivalent, this page delivers verified specifications, SOT-23-8 package details, real-world use cases in cordless power tools and drone propulsion control, and validated alternative options for design continuity.
Technical Context
The INA241B4IDDFR 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.
It supports bidirectional sensing via dual reference pins (REF1/REF2), enabling mid-supply output offset (e.g., VREF1 = VS, VREF2 = GND → VOUT = G·VSENSE + VS/2), and operates from 2.7V–20V supply while drawing only 2.5mA quiescent current - making it suitable for space-constrained, thermally sensitive industrial and portable applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100V/V - sets full-scale output to 100× shunt voltage drop; enables use of low-value shunts (e.g., 1mΩ) for 10A full-scale with 1V output swing. |
| Common-mode range | −5V to 110V - supports high-side, low-side, and inline sensing in 48V/60V bus systems without level-shifting or isolation. |
| Input offset voltage | ±150µV max - limits current measurement error to ≤150nA on a 1Ω shunt; critical for low-current detection in solenoid hold phases. |
| Small-signal bandwidth | 1.1MHz - ensures accurate capture of fast overcurrent events (e.g., <1µs rise-time fault currents) in motor phase-leg monitoring. |
| Step response settling | 1µs to 1% - guarantees timely feedback for closed-loop current regulation in PWM-driven BLDC controllers. |
| AC CMRR @ 1MHz | 89dB - attenuates 1V common-mode noise at 1MHz by >28,000×, preserving signal integrity during gate-driver switching. |
| Supply voltage | 2.7V to 20V - compatible with 3.3V microcontroller I/O rails and 12V/15V system supplies without external regulators. |
Pinout & Package
INA241B4IDDFR is housed in an 8-pin SOT-23 package (DDF), measuring 2.9mm × 2.8mm, with exposed pad for thermal enhancement and surface-mount compatibility in dense PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (Pin 1) | Negative current-sense input | Connects to load side of shunt in high-side config or ground side in low-side config; referenced to common-mode voltage. |
| GND (Pin 2) | Ground reference | System ground return for supply and output; must be low-impedance path to minimize offset errors. |
| REF2 (Pin 3) | Reference voltage input | One half of internal reference divider; tied to GND or VS to set output baseline for unidirectional/bidirectional operation. |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure stability and EMI performance. |
| OUT (Pin 5) | Analog output | Provides amplified, offset-adjusted voltage proportional to sensed current; drives ADC inputs directly with rail-to-rail capability. |
| VS (Pin 6) | Power supply | 2.7V–20V single supply; powers internal amplifiers and reference network; decoupling capacitor required at pin. |
| REF1 (Pin 7) | Reference voltage input | Second reference input; paired with REF2 to define output midpoint; matched internal resistors ensure ≤0.01% divider error. |
| IN+ (Pin 8) | Positive current-sense input | Connects to bus-voltage side of shunt in high-side config or load side in low-side config; handles up to 110V common-mode. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | Holds output stable for 1µs during fast common-mode edges (≤125kHz PWM), eliminating false overcurrent triggers in motor gate-drive circuits. |
| Bidirectional sensing support | Dual reference pins (REF1/REF2) enable configurable output offset - e.g., 0V–5V swing for ±50A measurement using 10mΩ shunt. |
| Constant input bias current | 35µA (typ) independent of common-mode voltage - avoids gain error drift when sensing across wide VCM ranges (e.g., −5V to 110V). |
| Low VSENSE accuracy | ±150µV offset + ±0.5µV/°C drift enables sub-1mA resolution on 1Ω shunts across −40°C to 125°C ambient. |
| High-speed transient response | 1.1MHz bandwidth + 8V/µs slew rate ensures faithful reproduction of current pulses ≥300ns duration in battery protection IC interfaces. |
Applications
| Motor Drive Current Monitoring | Cordless Power Tool Control |
|---|---|
|
Use Scenario: Real-time phase current measurement in 18V–40V brushed/BLDC motor drivers during PWM commutation. IC Role / Device Role / Timing Role: High-side bidirectional current sense amplifier with 1µs settling time, synchronizing with 20kHz–125kHz gate signals. Use Value: Enables precise torque control and overcurrent shutdown within 2µs of fault onset, preventing MOSFET destruction. |
Use Scenario: Battery discharge current monitoring and motor stall detection in compact 20V MAX cordless drills. IC Role / Device Role / Timing Role: Low-offset, high-CMRR amplifier interfacing 2mΩ shunt to 16-bit SAR ADC in MCU subsystem. Use Value: Achieves ±0.5A accuracy over battery life and temperature, extending runtime estimation fidelity by >12%. |
| Drone Propeller Speed Control | Injection Molding Machine Actuation |
|
Use Scenario: Per-motor current feedback in quadcopter ESCs operating at 4S LiPo (16.8V) with aggressive 50kHz PWM. IC Role / Device Role / Timing Role: PWM-rejection-optimized current sensor placed inline between FET half-bridge and brushless motor winding. Use Value: Suppresses 100mV output ripple from 100V/µs dV/dt transients, enabling stable PID loop gains without filtering delay. |
Use Scenario: Solenoid valve coil current profiling during hydraulic pressure ramp-up in industrial molding presses. IC Role / Device Role / Timing Role: High-voltage (≥60V) current monitor capturing 10ms hold-current transitions with <0.1% linearity error. Use Value: Detects coil degradation via 5% offset drift trend over 10,000 cycles, triggering predictive maintenance alerts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A4IDR | 100V/V gain, ±10µV max offset (A-grade), but no enhanced PWM rejection; 400kHz bandwidth. | Limited to lower-frequency (<50kHz) switching systems; unsuitable for fast gate-drive noise environments. | Select when ultra-low offset dominates over transient immunity - e.g., lab-grade power supply calibration. |
| MAX40056ATA+T | 100V/V gain, −5V to 65V common-mode, 2.5MHz bandwidth, but only unidirectional output and no REF pin flexibility. | Requires external level-shifting for bidirectional sensing; incompatible with mid-supply referenced ADCs. | Choose for high-bandwidth unidirectional monitoring where board space permits discrete reference circuitry. |
Compared with INA241B4IDDFR, INA240A4IDR trades PWM robustness for lower offset, while MAX40056ATA+T offers higher speed but sacrifices bidirectional configurability and common-mode range - making INA241B4IDDFR optimal for compact, high-noise, bidirectional industrial motor control.
Availability
INA241B4IDDFR is available at Aetrix Electronics and suitable for motor drives, cordless power tools, and drone propulsion systems requiring stable component supply, long-term production continuity, and guaranteed traceable sourcing.
Supply support for INA241B4IDDFR 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 delivering analog and embedded processing solutions, with deep expertise in precision signal chain and high-reliability power management ICs.
The INA241x family was designed specifically for high-voltage, high-speed bidirectional current sensing in switching power stages - targeting motor control, industrial automation, and battery-powered equipment where PWM noise immunity and DC accuracy are co-critical.
FAQ
What is the maximum common-mode voltage the INA241B4IDDFR can withstand during operation?
The INA241B4IDDFR has an operational common-mode input range of −5V to 110V, meaning it functions correctly when the voltage at IN+ and IN− floats anywhere within that span relative to GND. Its survival rating extends to −20V to 120V, allowing brief transients beyond operational limits without damage. This makes INA241B4IDDFR suitable for 48V and 60V bus monitoring in motor drives and industrial PLCs.
Does the INA241B4IDDFR support bidirectional current sensing out of the box?
Yes, the INA241B4IDDFR supports true bidirectional sensing via its dual reference inputs (REF1 and REF2). By setting REF1 = VS and REF2 = GND, the output centers at VS/2 - enabling positive current to produce VOUT > VS/2 and negative current to produce VOUT < VS/2. This eliminates need for external op-amps or level shifters, simplifying designs like regenerative braking current feedback in cordless tools.
How does the enhanced PWM rejection in the INA241B4IDDFR improve system reliability?
The enhanced PWM rejection in INA241B4IDDFR suppresses output disturbance during fast common-mode transients (up to 125kHz) by holding the output stable for 1µs, then leveraging 1.1MHz bandwidth and 89dB AC-CMRR at 1MHz to attenuate residual noise. In practice, this prevents false overcurrent trips in drone ESCs and reduces post-filtering requirements in medical cordless tool battery management, improving functional safety and signal fidelity.
What is the typical quiescent current draw of the INA241B4IDDFR, and how does it vary with supply voltage?
The INA241B4IDDFR draws 2.5mA typical quiescent current at 25°C with VSENSE = 0mV. Over temperature (−40°C to 125°C), IQ rises to 3.2mA max. It remains stable across 2.7V–20V supply - varying less than ±0.1mA from 5V to 15V - enabling consistent power budgeting in battery-operated devices like injection molding handheld remotes without supply-dependent calibration shifts.
Can the INA241B4IDDFR be used with a 1.8V microcontroller ADC input?
Yes, but only with external level-shifting or supply scaling. The INA241B4IDDFR requires a minimum 2.7V supply and its output swings from ~20mV above GND to ~200mV below VS. To interface with a 1.8V ADC, operate INA241B4IDDFR from a 3.3V supply and configure REF1/REF2 to set output mid-point at 0.9V; then use a precision resistor divider or rail-to-rail buffer to scale 0–3.3V output to 0–1.8V full-scale - preserving linearity and offset accuracy.
INA241B4IDDFR 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:
- -
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
INA241B4IDDFR FAQ
1.How can I place an order for INA241B4IDDFR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241B4IDDFR 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 INA241B4IDDFR reliable?
The price and inventory of INA241B4IDDFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241B4IDDFR is usually 5 days.
3.What payment methods are accepted for INA241B4IDDFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241B4IDDFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241B4IDDFR?
INA241B4IDDFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241B4IDDFR 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 INA241B4IDDFR?
For technical support, including INA241B4IDDFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241B4IDDFR requirements.
6.How does Aetrix verify that INA241B4IDDFR is sourced from the original manufacturer or authorized distributors?
All INA241B4IDDFR 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 INA241B4IDDFR meets industry standards.
7.What is the process for return or replacement of INA241B4IDDFR?
All INA241B4IDDFR units undergo pre-shipment inspection (PSI). If there is an issue with INA241B4IDDFR, 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 INA241B4IDDFR part is unused and in its original packaging.
Return procedure for INA241B4IDDFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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