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Texas Instruments INA241B1IDDFR
- Part No.:
- INA241B1IDDFR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
INA241B1IDDFR.pdf
- Description:
- -5-V TO 110-V BIDIRECTIONAL HIGH
- Quantity:
- Payment:
- Shipping:
Inventory:2,268
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Product details
Overview
INA241B1IDDFR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-voltage switching systems. It operates across −5V to 110V common-mode range, delivers 10V/V fixed gain, achieves ±0.1% max gain error and ±150µV max input offset voltage, and supports PWM rejection up to 125kHz - enabling accurate inline motor current monitoring in cordless power tools.
For engineers reviewing the INA241B1IDDFR datasheet, INA241B1IDDFR pinout, INA241B1IDDFR application, or INA241B1IDDFR equivalent, this page provides verified specifications, SOT-23-8 pin mapping, real-world use cases in solenoid control and drone propulsion, and two validated alternative parts with documented technical and application differences.
Technical Context
The INA241B1IDDFR 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 - suppressing disturbance from high-frequency switching nodes. Its input bias current remains constant (35µA typ) across −20V to 120V survival range, independent of VCM.
It features dual reference inputs (REF1/REF2) enabling programmable output centering from GND to VS, supporting both unidirectional and true bidirectional current measurement without external op-amps. The 1.1MHz small-signal bandwidth and 8V/µs slew rate ensure sub-microsecond response to overcurrent events at full gain.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 10V/V - sets output scaling for 100mV shunt drop → 1V output; enables use of low-value, low-power shunts. |
| Common-mode range | −5V to 110V operational - supports high-side sensing in 48V/60V bus systems beyond supply rail. |
| Input offset voltage | ±150µV max - limits measurement error to ≤1.5mV at 100mV sense voltage; critical for low-current detection. |
| Gain error | ±0.1% max - ensures <±1mV absolute error in 1V full-scale output; maintains accuracy across temperature. |
| Small-signal bandwidth | 1.1MHz - captures fast current transients (e.g., MOSFET switching edges) without phase lag or attenuation. |
| Supply voltage | 2.7V to 20V - compatible with 3.3V, 5V, and 12V logic domains while sensing on high-voltage power rails. |
| Quiescent current | 2.5mA typ - enables integration into power-constrained motor control PCBs without thermal penalty. |
Pinout & Package
INA241B1IDDFR is housed in an 8-pin SOT-23 package (DDF), measuring 2.9mm × 2.8mm, with exposed pad for thermal enhancement and space-constrained 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; defines differential input polarity. |
| GND (Pin 2) | Ground reference | System ground return for supply and reference circuitry; must be low-impedance path to minimize noise coupling. |
| REF2 (Pin 3) | Reference voltage input | One half of internal resistor divider; paired with REF1 to set output DC offset (e.g., mid-supply for bidirectional operation). |
| 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 | Amplified, referenced output voltage; drives ADC input or comparator with rail-to-rail swing (GND + 20mV to VS − 200mV). |
| VS (Pin 6) | Power supply | 2.7V–20V analog supply; powers internal amplifier stages and reference network; bypass capacitor required. |
| REF1 (Pin 7) | Reference voltage input | Second half of internal resistor divider; identical function to REF2; both pins must be biased within 0V to VS. |
| 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; completes differential sense path. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | Holds output for 1µs during fast common-mode transients up to 125kHz - eliminates false overcurrent triggers in motor gate-drive circuits. |
| Zero-drift topology | ±0.5µV/°C max offset drift - maintains calibration stability over −40°C to +125°C without periodic auto-zero cycles. |
| High AC CMRR | 104dB at 100kHz - rejects noise from adjacent switching converters, preserving signal integrity in dense power modules. |
| Bidirectional output centering | Configurable via REF1/REF2 pins - enables true ±500mV output swing around mid-supply for reversible motor current direction detection. |
| Constant input bias current | 35µA typ, independent of VCM - avoids gain error shift when sensing across wide common-mode ranges (e.g., battery discharge to regen). |
Applications
| Motor Drive Current Monitoring | Solenoid & Actuator Control |
|---|---|
|
Use Scenario: Real-time phase current measurement in 3-phase BLDC motor inverters using high-side shunts on 48V battery-powered cordless tools. IC Role / Device Role / Timing Role: Bidirectional current sense amplifier providing isolated, high-bandwidth analog feedback to MCU ADC for field-oriented control (FOC) loop closure. Use Value: 1.1MHz bandwidth and 1µs settling enable precise torque ripple suppression; ±150µV offset ensures <1% error at stall current. |
Use Scenario: Closed-loop current regulation in industrial pneumatic solenoids driven by PWM-switched 24V supplies. IC Role / Device Role / Timing Role: High-CMRR amplifier rejecting 20kHz PWM noise while delivering accurate average current to PID controller. Use Value: 104dB AC-CMRR at 100kHz prevents erroneous trip signals during rapid valve actuation; 10V/V gain matches 50mΩ shunt to 0–5V ADC range. |
| Drone Propeller Speed Control | Medical Cordless Tool Safety Monitoring |
|
Use Scenario: Per-motor current sensing in quadcopter ESCs where compact size and thermal efficiency are critical. IC Role / Device Role / Timing Role: SOT-23-8 current amplifier interfacing between low-ESR shunt and STM32H7 ADC, surviving 110V transient spikes during braking. Use Value: −5V to 110V common-mode range accommodates regenerative braking voltages; 2.5mA IQ minimizes battery drain during hover. |
Use Scenario: Overcurrent protection and torque-limiting in surgical handpieces powered by Li-ion packs with dynamic load profiles. IC Role / Device Role / Timing Role: Precision current monitor feeding safety microcontroller to enforce IEC 60601-1 current thresholds during tissue cutting. Use Value: ±0.1% gain error ensures compliance with Class BF leakage limits; 125°C rating supports sterilization-cycle thermal stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1IDR | Same 10V/V gain, but ±120µV max offset and no enhanced PWM rejection circuitry. | Limited to <50kHz switching; unsuitable for high-dV/dt motor gate drivers. | Select when cost sensitivity outweighs need for 125kHz PWM immunity and tighter offset spec. |
| MAX40056ASA+ | 10V/V gain, ±50µV max offset, but only −0.2V to 65V common-mode range and no REF1/REF2 flexibility. | Cannot support >65V bus or true bidirectional centering; requires external level-shifting for high-side sensing. | Choose only for 24V/48V systems requiring ultra-low offset where bidirectional operation is not needed. |
Compared with INA241B1IDDFR, INA240A1IDR lacks PWM rejection and has higher offset drift, while MAX40056ASA+ offers better offset but sacrifices common-mode range and reference configurability - making INA241B1IDDFR uniquely suited for 48V–60V bidirectional motor control with fast switching.
Availability
INA241B1IDDFR is available at Aetrix Electronics and suitable for motor drives, solenoid control, drone propulsion, medical cordless tools, and injection molding machines requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for INA241B1IDDFR 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 amplifiers and high-reliability signal conditioning ICs.
The INA241x product line was designed specifically for high-voltage, high-speed bidirectional current sensing in next-generation motor control, industrial automation, and portable power equipment - emphasizing PWM immunity, zero-drift stability, and flexible output referencing.
FAQ
What is the maximum common-mode voltage the INA241B1IDDFR can withstand during continuous operation?
The INA241B1IDDFR supports −5V to 110V common-mode voltage during normal operation, with survival capability up to −20V to 120V per absolute maximum ratings. This allows reliable high-side sensing on 48V, 60V, and 72V battery systems even during regenerative braking transients. The device maintains specified performance across its full −40°C to +125°C temperature range without derating. INA241B1IDDFR's input stage is explicitly designed to operate beyond its supply rail, decoupling sensing range from VS constraints.
How does the enhanced PWM rejection feature of the INA241B1IDDFR improve motor control reliability?
The INA241B1IDDFR's enhanced PWM rejection suppresses output disturbance during fast common-mode transients by holding the output for 1µs, then relying on high AC-CMRR (104dB @ 100kHz) for subsequent edges spaced ≥3µs apart. This prevents false overcurrent trips in BLDC motor gate drivers switching at 125kHz. INA241B1IDDFR thus enables robust FOC execution without software filtering delays or hardware snubbers - directly improving torque accuracy and system uptime.
Can the INA241B1IDDFR be used for bidirectional current measurement, and how is the output centered?
Yes, INA241B1IDDFR supports true bidirectional current sensing via its dual reference inputs (REF1 and REF2). Connecting REF1 to VS and REF2 to GND centers the output at VS/2 - enabling ±500mV swing for ±50mV shunt voltage (10V/V gain). This eliminates need for external level-shifting or dual-supply op-amps. INA241B1IDDFR's internal matched resistor network ensures <±0.01% reference divider error, maintaining symmetry across temperature and supply variations.
What is the typical quiescent current of the INA241B1IDDFR, and how does it vary with supply voltage?
INA241B1IDDFR draws 2.5mA typical quiescent current at 25°C, rising to 3.2mA maximum across −40°C to +125°C. It remains stable across 2.7V–20V supply range - varying less than ±5% from 2.7V to 12V, and increasing only ~8% at 20V. This predictability simplifies power budgeting in multi-rail systems. INA241B1IDDFR's supply current is fully characterized in datasheet Figure 6-31 and Table 6.5, confirming low-noise operation without excessive thermal load.
Does the INA241B1IDDFR require external components for stable operation, and what layout guidance applies?
Yes, INA241B1IDDFR requires a 1µF ceramic bypass capacitor between VS and GND, placed within 2mm of the pins, plus Kelvin connections to the shunt resistor to preserve accuracy. Layout must minimize trace inductance on IN+/IN− paths and avoid routing noisy digital traces near analog inputs. The NC pin (Pin 4) must be tied to GND. These requirements are validated in TI's layout guidelines (SBOSA30D, Section 8.4) and confirmed in evaluation module design files for INA241B1IDDFR.
INA241B1IDDFR 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
INA241B1IDDFR FAQ
1.How can I place an order for INA241B1IDDFR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241B1IDDFR 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 INA241B1IDDFR reliable?
The price and inventory of INA241B1IDDFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241B1IDDFR is usually 5 days.
3.What payment methods are accepted for INA241B1IDDFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241B1IDDFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241B1IDDFR?
INA241B1IDDFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241B1IDDFR 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 INA241B1IDDFR?
For technical support, including INA241B1IDDFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241B1IDDFR requirements.
6.How does Aetrix verify that INA241B1IDDFR is sourced from the original manufacturer or authorized distributors?
All INA241B1IDDFR 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 INA241B1IDDFR meets industry standards.
7.What is the process for return or replacement of INA241B1IDDFR?
All INA241B1IDDFR units undergo pre-shipment inspection (PSI). If there is an issue with INA241B1IDDFR, 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 INA241B1IDDFR part is unused and in its original packaging.
Return procedure for INA241B1IDDFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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