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Texas Instruments INA241A1IDR
- Part No.:
- INA241A1IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA241A1IDR.pdf
- Description:
- -5-V TO 110-V BIDIRECTIONAL ULTR
- Quantity:
- Payment:
- Shipping:
Inventory:2,369
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Product details
Overview
INA241A1IDR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-voltage switching systems. It operates over −5V to 110V common-mode range, delivers ±0.01% max gain error and ±10µV max offset voltage, and supports 125kHz PWM rejection-enabling accurate inline motor phase current measurement in industrial inverters.
For engineers reviewing the INA241A1IDR datasheet, INA241A1IDR pinout, INA241A1IDR application, or INA241A1IDR equivalent, this page provides verified specifications, package mapping, functional pin roles, real-world use cases, and validated alternative options for high-side/low-side current sensing in safety-critical power conversion.
Technical Context
The INA241A1IDR 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 up to 125kHz switching frequency. Its input stage maintains constant 35µA typical bias current 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 sensing. The 1.1MHz small-signal bandwidth and 8V/µs slew rate ensure sub-microsecond step response (1µs to 1%) for fast overcurrent detection in motor drives and solenoid control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 10V/V fixed-sets 10mV output per 1mA shunt current; enables high-resolution low-current sensing with minimal noise amplification. |
| Common-mode range | −5V to 110V operational-supports direct high-side sensing on 48V/60V bus systems without level-shifting or isolation. |
| Gain error | ±0.01% max at 25°C, ±1 ppm/°C drift-ensures <±0.02% total error over −40°C to 125°C, critical for closed-loop torque control accuracy. |
| Input offset voltage | ±10µV max, ±0.1µV/°C drift-allows accurate measurement of sub-100mV sense voltages across temperature, reducing shunt power loss. |
| Small-signal bandwidth | 1.1MHz at all gains-preserves fidelity of fast transient currents (e.g., motor startup surges, fault events) without phase lag. |
| PWM rejection | Validated to 125kHz-minimizes output ripple during gate-drive switching, eliminating need for external filtering in BLDC inverter designs. |
| Supply range | 2.7V to 20V-compatible with 3.3V, 5V, and 12V control rails while maintaining full common-mode performance. |
Pinout & Package
SOT-23-8 package (DDF), 2.9mm × 2.8mm footprint, surface-mount, thermally enhanced for high-power density 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) | Analog ground reference | System ground return for internal bias network; must be low-impedance path to minimize noise coupling. |
| REF2 (Pin 3) | Reference voltage input | One half of precision divider; paired with REF1 to set output mid-point (e.g., VS/2 for bidirectional operation). |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure stable operation and EMI immunity. |
| OUT (Pin 5) | Amplified output voltage | Delivers 10×(VIN+−VIN−) + (VREF1+VREF2)/2; rail-to-rail swing limited to VS−0.2V / GND+20mV. |
| VS (Pin 6) | Positive supply input | Accepts 2.7V–20V; powers internal amplifier and reference network; bypass capacitor required at pin. |
| REF1 (Pin 7) | Reference voltage input | Second half of precision divider; identical function to REF2; both pins must be biased within 0V–VS range. |
| 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 CM. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | 1µs output hold + high AC-CMRR (104dB @ 100kHz) suppresses gate-drive coupling, enabling clean current feedback in 100kHz+ motor drives. |
| Zero-drift input architecture | ±10µV max offset and ±0.1µV/°C drift enable stable sub-mA current measurement across automotive and industrial temperature ranges. |
| Dual reference inputs (REF1/REF2) | Allow precise output centering-e.g., 2.5V mid-supply for ±5A bidirectional sensing on 5V rail-without external op-amps or resistors. |
| Constant input bias current | 35µA typical, invariant over −20V to 120V VCM, eliminates gain error shift when sensing on high-voltage buses with large common-mode swings. |
| High-speed settling | 1µs to 1% ensures valid current data within one PWM cycle at 100kHz, supporting real-time overcurrent protection and field-oriented control. |
Applications
| Motor Drive Phase Current Sensing | Solenoid & Actuator Control |
|---|---|
|
Use Scenario: Real-time phase current monitoring in 3-phase BLDC/PMSM inverters operating at 48V–60V bus with 20kHz–100kHz PWM switching. IC Role / Device Role / Timing Role: High-side bidirectional current sense amplifier providing isolated analog feedback to MCU ADC with <1µs latency. Use Value: Enables precise FOC torque control and instantaneous overcurrent shutdown without external filtering or digital compensation. |
Use Scenario: Closed-loop current regulation in industrial solenoids and linear actuators powered from 24V–48V supplies with rapid on/off cycling. IC Role / Device Role / Timing Role: Low-latency current monitor interfacing directly to PWM controller or microcontroller analog input. Use Value: Maintains ±0.5% current accuracy across temperature, preventing coil overheating and ensuring repeatable mechanical stroke force. |
| Drone Propeller ESC Feedback | Medical Cordless Tool Battery Monitoring |
|
Use Scenario: Compact ESCs in multirotor drones requiring high-bandwidth current sensing (<1µs response) on 12V–24V battery inputs with aggressive thermal constraints. IC Role / Device Role / Timing Role: SOT-23-8 packaged current amplifier delivering 10× gain with minimal board area and thermal rise. Use Value: Sustains 1.1MHz bandwidth and 8V/µs slew rate in ambient temperatures up to 125°C, enabling reliable stall detection during aggressive maneuvers. |
Use Scenario: Bidirectional battery pack current monitoring in surgical cordless tools, where charge/discharge profiling impacts runtime and safety compliance. IC Role / Device Role / Timing Role: Precision shunt amplifier with ±10µV offset enabling µA-level quiescent current measurement and accurate Coulomb counting. Use Value: Delivers <±0.02% total gain error over −40°C to 125°C, meeting IEC 60601-1 leakage and accuracy requirements for Class BF equipment. |
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 ±0.1% max gain error and ±150µV offset; no enhanced PWM rejection circuitry. | Limited to ≤20kHz switching; requires external RC filtering for clean output in motor drive applications. | Select when cost sensitivity outweighs PWM rejection and ultra-precision needs-e.g., basic DC load monitoring. |
| MAX40056ASA+T | 10V/V gain, ±0.2% gain error, 2.5MHz bandwidth, but only −0.2V to 65V common-mode range and no REF pin flexibility. | Not suitable for >65V bus systems or bidirectional centering; lacks programmable output offset capability. | Choose for higher bandwidth in lower-voltage applications where REF-based output centering is unnecessary. |
Compared with INA241A1IDR, INA240A1IDR trades precision and PWM immunity for lower cost, while MAX40056ASA+T offers higher speed but sacrifices common-mode range and reference configurability-making INA241A1IDR optimal for 48V+ bidirectional systems demanding sub-µs fidelity.
Availability
INA241A1IDR is available at Aetrix Electronics and suitable for motor drives, solenoid control, and drone ESC designs requiring stable component supply, long-term production continuity, and guaranteed traceable sourcing.
Supply support for INA241A1IDR 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 power management ICs.
The INA241x family was engineered specifically for high-voltage, high-speed current sensing in next-generation motor control, robotics, and industrial automation-prioritizing PWM rejection, zero-drift stability, and wide common-mode operation.
FAQ
What is the maximum common-mode voltage the INA241A1IDR can withstand continuously?
The INA241A1IDR supports continuous operation from −5V to 110V common-mode input voltage. Its survival rating extends to −20V to 120V, allowing robust handling of transient overvoltage events in industrial 48V and 60V bus systems without latch-up or damage.
Does the INA241A1IDR require external components for basic operation?
No-INA241A1IDR operates with only a supply decoupling capacitor on VS and proper grounding. Its dual reference inputs (REF1/REF2) eliminate need for external level-shifting circuits, and its integrated PWM rejection removes requirement for input RC filters in most motor drive applications.
How does the INA241A1IDR achieve 125kHz PWM rejection?
The INA241A1IDR uses proprietary internal circuitry that detects fast ΔV/Δt common-mode edges and holds the output for 1µs, followed by high AC-CMRR (104dB @ 100kHz) attenuation. This two-stage mechanism prevents propagation of switching noise into the output signal during gate-drive transitions.
Can the INA241A1IDR be used for unidirectional current sensing?
Yes-INA241A1IDR supports unidirectional operation by connecting both REF1 and REF2 to GND (for ground-referenced output) or to VS (for supply-referenced output). This configures the output to swing from near-GND to near-VS, ideal for single-direction load monitoring.
What package options are available for the INA241A1IDR?
The INA241A1IDR is offered exclusively in the 8-pin SOT-23 (DDF) package-2.9mm × 2.8mm footprint, surface-mount compatible, with thermal resistance RθJA = 129.7°C/W-optimized for space-constrained motor control PCBs and high-density power modules.
INA241A1IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Single-Ended
- Slew Rate:
- 8V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1.1 MHz
- Current - Input Bias:
- 35 µA
- Voltage - Input Offset:
- 5 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:
- 8-SOIC
INA241A1IDR FAQ
1.How can I place an order for INA241A1IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241A1IDR 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 INA241A1IDR reliable?
The price and inventory of INA241A1IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241A1IDR is usually 5 days.
3.What payment methods are accepted for INA241A1IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241A1IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241A1IDR?
INA241A1IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241A1IDR 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 INA241A1IDR?
For technical support, including INA241A1IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241A1IDR requirements.
6.How does Aetrix verify that INA241A1IDR is sourced from the original manufacturer or authorized distributors?
All INA241A1IDR 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 INA241A1IDR meets industry standards.
7.What is the process for return or replacement of INA241A1IDR?
All INA241A1IDR units undergo pre-shipment inspection (PSI). If there is an issue with INA241A1IDR, 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 INA241A1IDR part is unused and in its original packaging.
Return procedure for INA241A1IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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