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Texas Instruments INA241B5IDDFR
- Part No.:
- INA241B5IDDFR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
INA241B5IDDFR.pdf
- Description:
- -5-V TO 110-V BIDIRECTIONAL HIGH
- Quantity:
- Payment:
- Shipping:
Inventory:3,851
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Product details
Overview
INA241B5IDDFR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-voltage switching systems, featuring 200V/V fixed gain, −5V to 110V operational common-mode range, ±0.1% max gain error, ±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 INA241B5IDDFR datasheet, INA241B5IDDFR pinout, INA241B5IDDFR application, or INA241B5IDDFR equivalent, this page delivers verified specifications, SOT-23-8 package mapping, real-world use cases in cordless power tools and drone propulsion, and validated alternative options with documented technical differences.
Technical Context
The INA241B5IDDFR employs a zero-drift, multistage amplifier architecture enabling 1.1MHz bandwidth at all gains while maintaining 8V/µs slew rate and 1µs 1% settling time. Its enhanced PWM rejection circuitry actively suppresses common-mode transients by holding output for 1µs during large ΔV/Δt events, then leveraging high AC-CMRR (89dB at 1MHz) for residual attenuation.
It operates from 2.7V–20V supply with 2.5mA quiescent current, supports bidirectional sensing via dual reference pins (REF1/REF2), and achieves input-referred voltage noise of 28nV/√Hz at 200V/V gain - all specified across −40°C to +125°C ambient temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200V/V - sets full-scale output to 2V for 10mV shunt drop, enabling high-resolution low-current measurement with minimal shunt power loss. |
| Common-mode range | −5V to 110V operational - supports high-side, low-side, and inline sensing in 48V/60V industrial bus systems without level-shifting. |
| Gain error | ±0.1% max - ensures <±2mV absolute error at 2V output, critical for closed-loop current regulation accuracy. |
| Input offset voltage | ±150µV max - limits worst-case measurement error to ±0.75mV at 200V/V gain, preserving sub-ampere resolution with 5mΩ shunt. |
| Bandwidth | 1.1MHz - captures fast overcurrent events (e.g., MOSFET short-circuit rise times <300ns) without phase lag. |
| PWM rejection | Up to 125kHz - suppresses switching noise from BLDC motor gate drivers, eliminating false trip signals in real-time protection circuits. |
| Supply voltage | 2.7V to 20V - compatible with 3.3V microcontroller ADC references and 12V/15V system rails without external regulators. |
Pinout & Package
INA241B5IDDFR is housed in an 8-pin SOT-23 (DDF) package measuring 2.9mm × 2.8mm, optimized for space-constrained PCB layouts in portable power tools and drone ESC modules.
| 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; withstands −20V to 120V survival voltage. |
| GND (Pin 2) | Ground reference | System ground return for supply and reference network; not isolated - must tie to PCB ground plane for noise immunity. |
| REF2 (Pin 3) | Reference voltage input | One half of internal divider; tied to GND for unidirectional output or to VS for mid-supply bias in bidirectional mode. |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure stable operation and EMI performance. |
| OUT (Pin 5) | Analog output | Single-ended voltage output scaled by 200× VSENSE plus (REF1+REF2)/2; swings within 20mV of GND and 200mV below VS. |
| VS (Pin 6) | Power supply | Accepts 2.7V–20V; powers internal amplifiers and reference circuitry; bypass capacitor required at pin for transient immunity. |
| REF1 (Pin 7) | Reference voltage input | Second half of internal divider; paired with REF2 to set output common-mode; matched to REF2 for <±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; shares same CMV rating as IN−. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | 1µs output hold + 89dB AC-CMRR at 1MHz - eliminates false overcurrent triggers during 100kHz BLDC commutation edges. |
| Zero-drift topology | ±0.5µV/°C offset drift - maintains <±1.25mV total offset error over −40°C to +125°C, enabling calibration-free operation in automotive under-hood environments. |
| Constant input bias current | 35µA typical, independent of common-mode voltage - avoids gain error shift when sensing across 110V bus, unlike competitive amplifiers with CMV-dependent bias. |
| Bidirectional output configuration | REF1/REF2 pins enable programmable output centering - allows direct interface to 0–3.3V SAR ADCs without external op-amps or level shifters. |
| Low-noise 200V/V gain | 28nV/√Hz input-referred noise - preserves signal integrity when using 1mΩ shunts for 0–50A measurement ranges in medical cordless tools. |
Applications
| Motor Drives | Cordless Power Tools |
|---|---|
|
Use Scenario: Real-time phase current monitoring in 18V–48V brushless DC motor controllers for angle-commutated torque control. IC Role / Device Role / Timing Role: High-side bidirectional current sense amplifier with 1.1MHz bandwidth and 1µs settling, synchronizing with 20kHz PWM gate signals. Use Value: Enables precise field-oriented control (FOC) by delivering accurate current feedback within 1µs of transient onset, reducing torque ripple by >40% versus legacy amplifiers. |
Use Scenario: Battery discharge current sensing in 20V MAX cordless drills with integrated battery management and thermal derating. IC Role / Device Role / Timing Role: Low-side shunt monitor interfacing directly to MCU's 12-bit ADC, operating from 3.3V supply with mid-supply reference. Use Value: Achieves ±0.5A accuracy over 0–30A range using 2mΩ shunt, extending runtime estimation fidelity and preventing premature cutoff during high-torque bursts. |
| Drone Propeller Speed Control | Injection Molding Machines |
|
Use Scenario: Individual ESC current monitoring in quadcopter platforms to detect propeller stall or imbalance during aggressive maneuvers. IC Role / Device Role / Timing Role: Inline current sensor with −5V to 110V CMV range, rejecting EMI from adjacent ESCs and enabling differential measurement against local ground. Use Value: Delivers 100ksps effective sampling via MCU oversampling, identifying 500mA stall currents with <1% error - critical for autonomous flight safety logic. |
Use Scenario: Hydraulic solenoid coil current profiling in 400V industrial molding presses to verify valve actuation timing and detect winding degradation. IC Role / Device Role / Timing Role: High-voltage bidirectional amplifier surviving 120V survival CMV, interfacing with isolated SPI DAC for closed-loop solenoid current regulation. Use Value: Maintains ±0.2% gain stability over 10-year service life, reducing false maintenance alerts by 92% compared to non-zero-drift alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A5IDR | Same 200V/V gain, but ±0.2% gain error (vs. ±0.1%), ±200µV offset (vs. ±150µV), no enhanced PWM rejection circuitry. | Lacks 125kHz PWM suppression - unsuitable for BLDC motor drives with fast-edge gate drivers; better for steady-state DC loads. | Select when cost sensitivity outweighs transient immunity needs and system CMV transients remain <50kHz. |
| MAX40056ASA+ | 200V/V gain, ±0.3% gain error, 1.5MHz bandwidth, but only −0.2V to 65V CMV range and no REF1/REF2 flexibility. | Cannot support >65V bus voltages or true bidirectional output centering - limited to low-voltage unidirectional applications. | Choose only for 24V/48V systems requiring marginally higher bandwidth and where mid-supply output bias is unnecessary. |
Compared with INA241B5IDDFR, INA240A5IDR trades PWM robustness for lower cost in static current monitoring, while MAX40056ASA+ sacrifices common-mode range and reference flexibility to achieve slightly higher bandwidth - neither matches the combined 110V CMV, 125kHz PWM rejection, and programmable output centering of INA241B5IDDFR.
Availability
INA241B5IDDFR is available at Aetrix Electronics and suitable for motor drives, cordless power tools, drone propulsion systems, and injection molding machines requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for INA241B5IDDFR 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 engineered specifically for high-fidelity current sensing in next-generation switching power systems - targeting motor control, battery-powered equipment, and industrial automation where accuracy under fast transients is non-negotiable.
FAQ
What is the maximum common-mode voltage the INA241B5IDDFR can withstand during operation?
The INA241B5IDDFR supports an operational common-mode voltage range of −5V to 110V. Its survival rating extends to −20V to 120V, meaning it can tolerate brief transients beyond operational limits without damage. This enables reliable use in 48V and 60V industrial buses, including high-side configurations where the shunt sits between bus voltage and load.
Does the INA241B5IDDFR require external components for stable operation?
Yes - the INA241B5IDDFR requires a 0.1µF ceramic bypass capacitor between VS (Pin 6) and GND (Pin 2), placed within 2mm of the pins. Additionally, NC (Pin 4) must be connected to GND. No external gain-setting resistors are needed since gain is fixed at 200V/V, and no compensation network is required due to internal unity-gain stability.
How does the enhanced PWM rejection feature function in the INA241B5IDDFR?
The INA241B5IDDFR implements a two-stage PWM rejection mechanism: first, it holds the output constant for 1µs upon detecting a large common-mode edge; second, it relies on 89dB AC-CMRR at 1MHz to attenuate residual transients occurring >3µs later. This design suppresses disturbances from 100kHz motor gate drivers, ensuring clean current waveforms reach the MCU ADC without post-processing filtering.
Can the INA241B5IDDFR be used for bidirectional current sensing without additional circuitry?
Yes - the INA241B5IDDFR natively supports bidirectional sensing via its REF1 and REF2 pins. Connecting REF1 to VS and REF2 to GND centers the output at VS/2, allowing positive and negative VSENSE to produce outputs above and below mid-supply. This eliminates need for external op-amps or level shifters when interfacing with single-supply ADCs.
What is the input-referred voltage noise of the INA241B5IDDFR at its 200V/V gain setting?
The INA241B5IDDFR exhibits 28nV/√Hz input-referred voltage noise at 200V/V gain, measured at 1kHz. This low noise floor enables accurate measurement of small shunt voltages (e.g., 1mV across a 1mΩ resistor), supporting high-resolution current sensing down to ±25mA with 12-bit ADCs - essential for battery fuel gauging in medical cordless tools.
INA241B5IDDFR 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
INA241B5IDDFR FAQ
1.How can I place an order for INA241B5IDDFR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241B5IDDFR 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 INA241B5IDDFR reliable?
The price and inventory of INA241B5IDDFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241B5IDDFR is usually 5 days.
3.What payment methods are accepted for INA241B5IDDFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241B5IDDFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241B5IDDFR?
INA241B5IDDFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241B5IDDFR 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 INA241B5IDDFR?
For technical support, including INA241B5IDDFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241B5IDDFR requirements.
6.How does Aetrix verify that INA241B5IDDFR is sourced from the original manufacturer or authorized distributors?
All INA241B5IDDFR 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 INA241B5IDDFR meets industry standards.
7.What is the process for return or replacement of INA241B5IDDFR?
All INA241B5IDDFR units undergo pre-shipment inspection (PSI). If there is an issue with INA241B5IDDFR, 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 INA241B5IDDFR part is unused and in its original packaging.
Return procedure for INA241B5IDDFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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