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Texas Instruments INA241A4IDDFR
- Part No.:
- INA241A4IDDFR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
INA241A4IDDFR.pdf
- Description:
- -5-V TO 110-V BIDIRECTIONAL ULTR
- Quantity:
- Payment:
- Shipping:
Inventory:2,493
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Product details
Overview
INA241A4IDDFR 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, ±0.015% max gain error, ±10µV 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 INA241A4IDDFR datasheet, INA241A4IDDFR pinout, INA241A4IDDFR application, or INA241A4IDDFR equivalent, this page delivers verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options - all grounded in TI's SBOSA30D production datasheet (December 2024 revision).
Technical Context
The INA241A4IDDFR employs a zero-drift, multistage architecture enabling 1.1MHz small-signal bandwidth and 8V/µs slew rate across its 100V/V gain setting, with input bias current held constant at 35µA (typ) up to 110V common-mode voltage - eliminating VCM-dependent leakage errors. Its enhanced PWM rejection circuitry holds output stability for 1µs during large ΔV/Δt transients, then leverages 104dB AC-CMRR at 100kHz to suppress residual disturbance.
This device operates from 2.7V–20V supply, draws 2.5mA quiescent current, and supports bidirectional sensing via dual reference pins (REF1/REF2) that set output mid-point voltage - enabling flexible unidirectional or bipolar output swing without external level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100V/V - enables accurate low-side or high-side shunt voltage amplification with 10mV input yielding full-scale 1V output, optimizing SNR for 10–100A current ranges using standard 1–10mΩ shunts. |
| Common-mode range | −5V to 110V operational - supports direct connection to bus voltages exceeding supply rail (e.g., 48V/60V/80V motor phases), eliminating need for level-shifters or isolated supplies. |
| Gain error | ±0.015% max - ensures <±1.5mV absolute error on 10V output scale, critical for closed-loop torque control where <0.1% current accuracy affects field-oriented control fidelity. |
| Input offset voltage | ±10µV max - allows reliable detection of sub-100mA currents through 10mΩ shunts (1µV = 0.1mA), essential for low-power solenoid idle-state monitoring. |
| Small-signal bandwidth | 1.1MHz - captures fast overcurrent events (e.g., MOSFET shoot-through) within <1µs, enabling hardware-fast shutdown before IGBT damage occurs. |
| PWM rejection limit | 125kHz - fully suppresses switching noise from 20kHz–100kHz motor gate drivers and buck converters, preventing false trip signals in safety-critical drives. |
| Supply voltage | 2.7V to 20V - compatible with 3.3V microcontroller ADC references and 12V/15V industrial rails without LDO buffering. |
Pinout & Package
SOT-23-8 package (DDF), 2.9mm × 2.8mm footprint, thermally enhanced for high-density motor control PCBs with minimal board area impact.
| 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; differential pair input with matched impedance for CMRR integrity. |
| GND (Pin 2) | Analog ground reference | Primary return path for internal biasing and output stage; must tie to clean analog ground plane, separate from power ground to avoid PSRR degradation. |
| REF2 (Pin 3) | Reference voltage input | One half of precision divider network; tied to GND for unidirectional output or to VS for VS-referenced output; matched to REF1 for <±0.01% reference division error. |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure ESD robustness and thermal stability in SOT-23 package. |
| OUT (Pin 5) | Amplified output voltage | Delivers 100×(VIN+−VIN−) + (VREF1+VREF2)/2; rail-to-rail capable down to 20mV above GND and up to 200mV below VS for wide dynamic range. |
| VS (Pin 6) | Positive supply input | Accepts 2.7V–20V; powers internal amplifiers and reference network; bypass capacitor (≥1µF ceramic) required within 3mm for stable PWM rejection performance. |
| REF1 (Pin 7) | Reference voltage input | Second half of precision divider; functionally identical to REF2; connecting REF1=VS and REF2=GND sets output mid-supply for bidirectional current measurement. |
| 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; designed for >110V transient survival with −20V to 120V absolute rating. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | 1µs output hold + 104dB AC-CMRR at 100kHz - eliminates output corruption during gate-driver edge transitions, enabling direct connection to half-bridge nodes without filtering. |
| Zero-drift input architecture | ±10µV max offset, ±0.1µV/°C drift - maintains sub-0.1% current measurement accuracy from −40°C to 125°C, critical for automotive and industrial ambient extremes. |
| Constant input bias current | 35µA (typ), independent of VCM - avoids gain error drift when sensing across high common-mode voltages (e.g., 80V battery packs), unlike competitive amplifiers with VCM-scaled bias. |
| Dual reference inputs (REF1/REF2) | Configurable output offset from GND to VS - supports unidirectional 0–5V output or bidirectional ±2.5V output using single supply, removing need for external op-amps or DACs. |
| Survival voltage rating | −20V to 120V - withstands load-dump transients and inductive kickback in 48V/60V systems without external clamping diodes or TVS devices. |
Applications
| Motor Drive Current Monitoring | Solenoid & Actuator Control |
|---|---|
|
Use Scenario: Real-time phase current measurement in 3-phase BLDC motor inverters operating at 48V bus with 20kHz–40kHz PWM switching. IC Role / Device Role / Timing Role: High-side bidirectional current sense amplifier placed between upper MOSFET and DC bus, rejecting common-mode dv/dt while delivering 1.1MHz bandwidth output to MCU ADC. Use Value: Enables field-oriented control with <0.5% current ripple rejection, reducing torque pulsation and acoustic noise without adding RC filters that degrade response time. |
Use Scenario: Closed-loop current regulation in industrial pneumatic solenoids powered from 24V–48V supplies with rapid on/off cycling. IC Role / Device Role / Timing Role: Low-side shunt amplifier providing fast 1µs settling output to microcontroller for real-time current limiting and stall detection. Use Value: Prevents coil overheating by detecting >10% overcurrent within 2µs, allowing immediate PWM duty cycle reduction before thermal shutdown. |
| Cordless Power Tool Battery Management | Drone Propeller ESC Feedback |
|
Use Scenario: Bidirectional pack current sensing in 18V–60V cordless drill battery packs during charge/discharge cycles with pulsed loads. IC Role / Device Role / Timing Role: Inline shunt amplifier with REF1=VS and REF2=GND generating ±2.5V output centered at 2.5V for MCU differential ADC input. Use Value: Achieves ±0.2% state-of-charge accuracy over temperature by maintaining ±10µV offset stability, extending usable runtime estimation fidelity. |
Use Scenario: Per-motor current feedback in quadcopter electronic speed controllers handling 5–30A peak currents with 50kHz ESC switching. IC Role / Device Role / Timing Role: High-bandwidth 100V/V amplifier rejecting common-mode noise from adjacent ESCs while delivering <1µs step response to flight controller. Use Value: Enables precise thrust vectoring by resolving 100mA current deltas at 10kHz update rates, improving hover stability and maneuver responsiveness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A4IDDFR | Same 100V/V gain, but ±0.2% max gain error and ±60µV max offset; no enhanced PWM rejection circuitry. | Limited to lower-frequency (<20kHz) or non-switching applications like DC power supply monitoring. | Select only if cost sensitivity outweighs PWM noise immunity and precision requirements in motor/solenoid use cases. |
| AD8210WYRZ-RL | 100V/V gain, −2V to 65V common-mode range, ±100µV offset, no REF pin configuration - fixed unidirectional output. | Suitable for 12V–48V automotive low-side sensing but cannot support bidirectional or high-VCM (>65V) operation. | Choose only for legacy 48V systems requiring AEC-Q100 qualification; not viable for 80V+ industrial or drone ESC designs. |
Compared with INA241A4IDDFR, INA240A4IDDFR trades 10× higher gain error and missing PWM rejection for lower unit cost, while AD8210WYRZ-RL offers automotive qualification but sacrifices common-mode headroom, bidirectionality, and precision - making INA241A4IDDFR the sole option meeting all three: 110V VCM, 125kHz PWM immunity, and ±10µV offset.
Availability
INA241A4IDDFR is available at Aetrix Electronics and suitable for motor drives, solenoid control, and drone ESC applications requiring stable component supply, long-term manufacturability, and guaranteed traceable sourcing.
Supply support for INA241A4IDDFR 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-voltage, high-speed current sensing in next-generation motor control, battery management, and power conversion systems demanding ultra-low drift and robust PWM noise immunity.
FAQ
What is the maximum common-mode voltage the INA241A4IDDFR can withstand continuously?
The INA241A4IDDFR supports continuous operation from −5V to 110V common-mode voltage, with survival rating up to −20V to 120V per absolute maximum ratings. This enables direct placement on 48V, 60V, and 80V bus lines in motor drives and power tools without external protection circuitry - verified per TI SBOSA30D Section 6.1.
Does the INA241A4IDDFR require external components for basic operation?
The INA241A4IDDFR requires only a 1µF ceramic bypass capacitor on the VS pin within 3mm of the device and grounding of the NC pin to GND - no external resistors, capacitors, or level shifters are needed for standard unidirectional or bidirectional configurations. Reference pins (REF1/REF2) may be tied directly to VS and GND for mid-supply output.
How does the enhanced PWM rejection in the INA241A4IDDFR improve system reliability?
The INA241A4IDDFR's enhanced PWM rejection holds output stable for 1µs during large common-mode dv/dt transients (e.g., MOSFET switching edges), then attenuates residual noise via 104dB AC-CMRR at 100kHz - preventing false overcurrent triggers in motor drives and ESCs. This eliminates need for slow RC filters that degrade fault response time, directly improving functional safety compliance.
Can the INA241A4IDDFR measure bidirectional current with a single supply?
Yes - the INA241A4IDDFR supports true bidirectional current sensing with a single 2.7V–20V supply by connecting REF1 to VS and REF2 to GND, producing an output centered at VS/2. For example, with 5V supply, 0A yields 2.5V output, +I yields >2.5V, and −I yields <2.5V - enabling full-range measurement without dual supplies or external op-amps.
What is the typical quiescent current draw of the INA241A4IDDFR?
The INA241A4IDDFR draws 2.5mA typical quiescent current at 25°C and 5V supply, rising to 3.2mA maximum across −40°C to 125°C operating range. This low power consumption enables integration into battery-powered tools and drones without significant impact on runtime - confirmed in SBOSA30D Section 6.5.
INA241A4IDDFR 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:
- 3 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
INA241A4IDDFR FAQ
1.How can I place an order for INA241A4IDDFR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241A4IDDFR 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 INA241A4IDDFR reliable?
The price and inventory of INA241A4IDDFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241A4IDDFR is usually 5 days.
3.What payment methods are accepted for INA241A4IDDFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241A4IDDFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241A4IDDFR?
INA241A4IDDFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241A4IDDFR 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 INA241A4IDDFR?
For technical support, including INA241A4IDDFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241A4IDDFR requirements.
6.How does Aetrix verify that INA241A4IDDFR is sourced from the original manufacturer or authorized distributors?
All INA241A4IDDFR 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 INA241A4IDDFR meets industry standards.
7.What is the process for return or replacement of INA241A4IDDFR?
All INA241A4IDDFR units undergo pre-shipment inspection (PSI). If there is an issue with INA241A4IDDFR, 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 INA241A4IDDFR part is unused and in its original packaging.
Return procedure for INA241A4IDDFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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