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Texas Instruments INA241B3IDDFR
- Part No.:
- INA241B3IDDFR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
INA241B3IDDFR.pdf
- Description:
- -5-V TO 110-V BIDIRECTIONAL HIGH
- Quantity:
- Payment:
- Shipping:
Inventory:4,926
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Product details
Overview
INA241B3IDDFR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-voltage switching systems, featuring 50V/V fixed gain, −5V to 110V operational common-mode range, ±150µV max input offset voltage, and enhanced PWM rejection up to 125kHz-used in motor drive current monitoring where fast transient immunity and sub-millivolt-level shunt voltage accuracy are required.
For engineers reviewing the INA241B3IDDFR datasheet, INA241B3IDDFR pinout, INA241B3IDDFR application, or INA241B3IDDFR equivalent, this page delivers verified specifications, SOT-23-8 package details, real-world use cases in cordless power tools and drone propulsion, and validated alternative options with documented technical differences.
Technical Context
The INA241B3IDDFR employs a zero-drift, multistage amplifier architecture enabling 1.1MHz bandwidth and 8V/µs slew rate across all gains-including its 50V/V configuration-while maintaining stable performance under large ΔV/Δt common-mode transients. Its internal reference divider network allows configurable unidirectional or bidirectional output centering via REF1/REF2 pins.
It achieves 130dB typical DC CMRR and 89dB AC CMRR at 1MHz, with input bias current held constant at 35µA (typ) over −20V to 120V survival common-mode range-unaffected by VCM-enabling precision low-side, high-side, and inline sensing without signal degradation from switching noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V fixed-sets full-scale output to 2.5V for 50mV shunt drop, optimizing dynamic range for mid-current motor control applications. |
| Common-mode range | −5V to 110V operational-supports direct high-side sensing on 48V bus systems without level-shifting or external protection. |
| Input offset voltage | ±150µV max-enables accurate measurement of ≤3mΩ shunt resistors at 5A with <0.3% error contribution at room temperature. |
| Bandwidth | 1.1MHz (−3dB)-captures fast overcurrent events in <1µs, critical for IGBT/MOSFET short-circuit protection timing. |
| PWM rejection | Up to 125kHz-suppresses output disturbance during gate-driver switching edges, eliminating need for external RC filtering in BLDC inverters. |
| Supply voltage | 2.7V to 20V-operates from single 3.3V or 5V rail while interfacing with 12V–48V power stages, simplifying system power architecture. |
| Quiescent current | 2.5mA typ-minimizes standby power in battery-powered tools without sacrificing response speed or precision. |
Pinout & Package
INA241B3IDDFR is packaged in an 8-pin SOT-23 (DDF) footprint measuring 2.9mm × 2.8mm, optimized for space-constrained PCB layouts in portable power tools and compact drone ESCs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (Pin 1) | Negative current-sense input | Connects to load or ground side of shunt; defines differential input polarity for bidirectional current direction detection. |
| GND (Pin 2) | Analog ground reference | System ground return for internal circuitry; must be low-impedance path to minimize offset error from ground bounce. |
| REF2 (Pin 3) | Reference voltage input | One half of internal resistor divider; tied to GND or VS to set output mid-point for unidirectional/bidirectional operation. |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure stability and EMI immunity. |
| OUT (Pin 5) | Amplified output | Delivers 50×(VIN+−VIN−) + (VREF1+VREF2)/2; drives ADC inputs directly with rail-to-rail swing capability. |
| VS (Pin 6) | Positive supply | Accepts 2.7V–20V; powers internal amplifiers and reference network; output swing limited to within 200mV of this rail. |
| REF1 (Pin 7) | Reference voltage input | Second half of internal divider; paired with REF2 to configure output offset-e.g., VS/2 for bidirectional zero-centered output. |
| IN+ (Pin 8) | Positive current-sense input | Connects to bus or load side of shunt; combined with IN−, forms Kelvin-sense pair rejecting PCB trace resistance errors. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | Suppresses output disturbance during 125kHz switching transients via internal ΔV/Δt compensation-eliminates need for external filtering in motor gate-drive feedback loops. |
| Constant input bias current | 35µA (typ) independent of common-mode voltage-prevents gain error drift when sensing across wide VCM ranges (e.g., −5V to 110V), unlike competitive amplifiers with VCM-dependent leakage. |
| Zero-drift topology | ±150µV max offset and ±0.5µV/°C drift-ensures stable 50mV shunt measurements over −40°C to 125°C without calibration in industrial tool environments. |
| Configurable reference interface | Dual REF1/REF2 pins enable precise output centering-e.g., tie REF1 to VS and REF2 to GND for mid-supply bidirectional output, or short both to GND for unidirectional 0–VS scaling. |
| High-speed settling | 1µs to 1% for step inputs-supports real-time current limiting in fast-switching power converters where delay impacts fault response time. |
Applications
| Motor Drives | Cordless Power Tools |
|---|---|
|
Use Scenario: Real-time phase current monitoring in 3-phase BLDC motor inverters using high-side shunts on 18–48V battery supplies. IC Role / Device Role / Timing Role: Bidirectional current sense amplifier providing isolated, high-bandwidth analog feedback to MCU ADC for field-oriented control (FOC) and overcurrent shutdown. Use Value: 1.1MHz bandwidth and 125kHz PWM rejection prevent false triggering during gate transitions, enabling reliable torque control at 20kHz PWM carrier frequency. |
Use Scenario: Battery discharge current sensing in compact 18V/20V MAX cordless drills and impact drivers with space-limited PCBs. IC Role / Device Role / Timing Role: High-precision, low-offset current monitor interfacing directly to 12-bit MCU ADC for state-of-charge estimation and thermal derating. Use Value: ±150µV offset enables accurate 0.5A–30A measurement using 2mΩ shunt, minimizing I²R losses while maintaining <1% total error over temperature. |
| Drone Propeller Speed Control | Injection Molding Machines |
|
Use Scenario: Individual ESC current feedback in multirotor drones with 4S–6S LiPo batteries and rapid throttle transients. IC Role / Device Role / Timing Role: Fast-settling (1µs) current amplifier delivering clean analog signals to flight controller for adaptive PID tuning and stall detection. Use Value: 8V/µs slew rate and 1.1MHz bandwidth capture 100A peak pulses without distortion, improving propeller RPM responsiveness and reducing oscillation. |
Use Scenario: Hydraulic pump motor current monitoring in industrial injection molding machines operating at 400VAC with high EMI environments. IC Role / Device Role / Timing Role: Robust high-side current sensor immune to ground noise and common-mode transients from contactor switching. Use Value: −20V to 120V survival rating and 130dB CMRR suppress interference from 50Hz mains harmonics and relay coil spikes, ensuring stable closed-loop pressure control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A3IDDFR | Same 50V/V gain and SOT-23-8 package, but ±10µV max offset and ±0.01% gain error-higher precision grade (A-series vs B-series). | Required where <0.05% total current measurement error is mandatory, e.g., medical-grade battery management or metrology. | Select INA240A3IDDFR only if offset drift and gain stability over temperature are more critical than cost; INA241B3IDDFR offers better PWM rejection. |
| MAX40056ATA+T | 50V/V gain, −5V to 65V common-mode range, 1.5MHz bandwidth-but no integrated REF1/REF2 configuration; requires external reference. | Suitable for simpler unidirectional sensing where mid-supply output isn't needed and VCM stays below 65V. | Choose MAX40056ATA+T for cost-sensitive, lower-voltage (<65V) applications with fixed-output polarity; INA241B3IDDFR supports wider VCM and flexible bidirectional output. |
Compared with INA240A3IDDFR and MAX40056ATA+T, INA241B3IDDFR uniquely combines 110V common-mode tolerance, programmable bidirectional output via dual reference pins, and industry-leading 125kHz PWM rejection-making it optimal for high-reliability motor control in variable-voltage, high-noise industrial and portable equipment.
Availability
INA241B3IDDFR 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 INA241B3IDDFR 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 expertise in precision signal conditioning and high-reliability industrial ICs.
The INA241x product line was designed specifically for high-voltage, high-speed current sensing in switching power systems-addressing the need for accurate, noise-immune feedback in motor control, energy storage, and automated industrial equipment.
FAQ
What is the maximum common-mode voltage the INA241B3IDDFR can withstand during operation?
The INA241B3IDDFR operates continuously over a common-mode input range of −5V to 110V. Its survival rating extends to −20V to 120V, meaning it tolerates brief transients beyond operational limits without damage-critical for robustness in 48V motor drive bus monitoring where load-dump spikes occur.
How does the INA241B3IDDFR achieve enhanced PWM rejection, and what is its effective frequency limit?
The INA241B3IDDFR uses internal ΔV/Δt compensation circuitry that holds output for 1µs during large common-mode transients, then relies on 1.1MHz bandwidth and 89dB AC CMRR at 1MHz to attenuate subsequent edges. This architecture delivers effective PWM rejection up to 125kHz-validated in TI's SBOSA30D datasheet Figure 7-1.
Can the INA241B3IDDFR be used for bidirectional current sensing, and how is the output centered?
Yes, the INA241B3IDDFR supports true bidirectional sensing. To center output at mid-supply, connect REF1 to VS and REF2 to GND-the internal divider sets VOUT = 50×(VIN+−VIN−) + VS/2, enabling symmetric positive/negative current representation around VS/2.
What is the input offset voltage specification for the INA241B3IDDFR, and how does it impact low-current measurement?
The INA241B3IDDFR has a maximum input offset voltage of ±150µV at 25°C, with ±0.5µV/°C drift. When used with a 5mΩ shunt, this corresponds to ±30mA equivalent error-enabling accurate measurement down to ~100mA full-scale while maintaining <0.3% error contribution across −40°C to 125°C.
Which package type does the INA241B3IDDFR use, and what are its board-level implications?
The INA241B3IDDFR uses the DDF package: an 8-pin SOT-23 measuring 2.9mm × 2.8mm. Its small footprint and thermal resistance of 129.7°C/W (RθJA) make it ideal for densely populated PCBs in portable tools and drones-though thermal vias under the exposed pad (if present) are recommended for sustained >2.5mA operation.
INA241B3IDDFR 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
INA241B3IDDFR FAQ
1.How can I place an order for INA241B3IDDFR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241B3IDDFR 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 INA241B3IDDFR reliable?
The price and inventory of INA241B3IDDFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241B3IDDFR is usually 5 days.
3.What payment methods are accepted for INA241B3IDDFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241B3IDDFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241B3IDDFR?
INA241B3IDDFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241B3IDDFR 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 INA241B3IDDFR?
For technical support, including INA241B3IDDFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241B3IDDFR requirements.
6.How does Aetrix verify that INA241B3IDDFR is sourced from the original manufacturer or authorized distributors?
All INA241B3IDDFR 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 INA241B3IDDFR meets industry standards.
7.What is the process for return or replacement of INA241B3IDDFR?
All INA241B3IDDFR units undergo pre-shipment inspection (PSI). If there is an issue with INA241B3IDDFR, 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 INA241B3IDDFR part is unused and in its original packaging.
Return procedure for INA241B3IDDFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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