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Texas Instruments INA241A2IDR
- Part No.:
- INA241A2IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA241A2IDR.pdf
- Description:
- -5-V TO 110-V BIDIRECTIONAL ULTR
- Quantity:
- Payment:
- Shipping:
Inventory:2,231
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Product details
Overview
INA241A2IDR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-voltage switching systems, featuring 20V/V fixed gain, −5V to 110V operational common-mode range, ±10µV max input offset voltage, ±0.01% max gain error, and enhanced PWM rejection up to 125kHz - deployed in motor drives and cordless power tools for accurate inline current monitoring under fast transient conditions.
For engineers reviewing the INA241A2IDR datasheet, INA241A2IDR pinout, INA241A2IDR application, or INA241A2IDR equivalent, this page delivers verified specifications, package mapping (SOIC-8), functional pin definitions, real-world use cases, and two validated alternative parts - all aligned with TI's SBOSA30D production data sheet (December 2024 revision).
Technical Context
The INA241A2IDR employs a zero-drift, multistage amplifier architecture enabling 1.1MHz bandwidth at all gains while maintaining 166dB DC-CMRR and 104dB AC-CMRR at 100kHz. Its enhanced PWM rejection circuitry holds output stability for 1µs during large ΔV/Δt common-mode transients, then relies on high AC-CMRR and bandwidth to suppress subsequent disturbances.
It supports bidirectional sensing via dual reference inputs (REF1/REF2), allowing configurable output centering from GND to VS; operates from 2.7V–20V supply; draws 2.5mA quiescent current; and sustains accuracy across −40°C to +125°C with ±0.1µV/°C offset drift and ±1ppm/°C gain drift - critical for closed-loop motor control and safety-critical overcurrent detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V - sets full-scale output to 20× sensed differential voltage, enabling precise low-side or high-side shunt measurement with minimal gain error impact on dynamic range. |
| Common-mode range | −5V to 110V operational - supports direct connection to bus voltages exceeding supply rail (e.g., 48V/60V motor phases), eliminating level-shifting requirements. |
| Input offset voltage | ±10µV max - ensures sub-milliohm shunt accuracy at low currents (e.g., <1A) without calibration, critical for battery-powered tool current profiling. |
| Small-signal bandwidth | 1.1MHz - enables reliable detection of fast overcurrent events (<1µs rise time) in PWM-driven solenoids and drone ESCs. |
| Step response (1%) | 1µs - guarantees timely feedback for digital current limiting loops operating at ≥100kHz switching frequencies. |
| Supply voltage | 2.7V to 20V - compatible with single-supply industrial logic rails (3.3V/5V) and higher-voltage motor control domains (12V/15V/18V). |
| Quiescent current | 2.5mA - enables integration into always-on subsystems (e.g., battery management monitors) without excessive standby power penalty. |
Pinout & Package
INA241A2IDR is packaged in an 8-pin SOIC (D package), 4.9mm × 6mm body size, with exposed pad not present. Pin functions are identical across SOIC-8, VSSOP-8, and SOT-23-8 variants per TI's SBOSA30D datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Current-sense amplifier positive input | Connect to bus-voltage side of shunt in high-side config; load side in low-side config - handles −5V to 110V common-mode. |
| IN− | Current-sense amplifier negative input | Connect to load side of shunt in high-side config; ground side in low-side config - forms differential input pair with IN+. |
| GND | Ground reference | System ground return for supply and output stage; required for stable biasing and noise immunity. |
| REF2 | Reference voltage input | Paired with REF1 to set output mid-point; connected to GND or VS to enable unidirectional/bidirectional operation. |
| OUT | Analog output | Single-ended voltage output = 20×(IN+ − IN−) + (REF1 + REF2)/2; swings within 20mV of GND and 200mV below VS. |
| VS | Power supply | 2.7V–20V analog supply; powers internal amplifier stages and reference network - independent of input common-mode voltage. |
| REF1 | Reference voltage input | Matches REF2 function; precision-matched internal resistor divider ensures accurate output centering when used differentially. |
| NC | No-connect terminal | Reserved pin; must be connected to GND per datasheet to ensure EMI robustness and thermal stability. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | Stabilizes output for 1µs during fast common-mode edges (≤125kHz), reducing false overcurrent triggers in motor gate-drive environments. |
| Zero-drift topology | Delivers ±10µV max offset and ±0.1µV/°C drift - eliminates need for system-level offset calibration across temperature in medical cordless tools. |
| Bidirectional sensing support | Dual reference inputs (REF1/REF2) allow programmable output centering - enables true bidirectional current measurement without external op-amps. |
| High AC-CMRR at 1MHz | 89dB rejection at 1MHz - maintains signal integrity during high-frequency switching noise coupling in injection molding machine inverters. |
| Low input bias current | 35µA typical, constant across −20V to 120V - prevents shunt voltage error in high-impedance, low-current applications like solenoid diagnostics. |
Applications
| Motor Drives | Solenoids and Actuators |
|---|---|
Use Scenario: Real-time phase current monitoring in 3-phase BLDC motor controllers for field-oriented control (FOC). IC Role / Device Role / Timing Role: High-side bidirectional current sense amplifier with 1µs step response, synchronizing with 20kHz PWM gate signals. Use Value: Enables precise torque regulation and overcurrent shutdown within 2µs - preventing IGBT failure during stall conditions. |
Use Scenario: Closed-loop current control in industrial pneumatic solenoid valves with rapid on/off cycling. IC Role / Device Role / Timing Role: Low-drift, high-CMRR amplifier measuring solenoid coil current during 100kHz PWM bursts. Use Value: Maintains ±0.5% current accuracy despite 100V common-mode transients - ensuring repeatable valve positioning. |
| Cordless Power Tools | Drone Propeller Speed Control |
Use Scenario: Battery discharge current sensing in 18V/20V Li-ion powered drills and saws with brushless motors. IC Role / Device Role / Timing Role: Bidirectional shunt monitor interfacing with MCU ADC, supporting regenerative braking detection. Use Value: ±10µV offset enables <10mA resolution at 1mΩ shunt - extending runtime estimation accuracy by >3% over tool lifetime. |
Use Scenario: ESC current feedback in 4S–6S multirotor drones with 40A peak motor loads. IC Role / Device Role / Timing Role: High-bandwidth (1.1MHz), low-noise amplifier capturing rapid current spikes during propeller load changes. Use Value: 1.1MHz bandwidth resolves 50ns current transients - improving PID loop stability and reducing propeller oscillation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A2IDR | Lower CMRR (150dB DC), no enhanced PWM rejection, 400kHz bandwidth, ±20µV offset | Not suitable for >50kHz PWM systems; requires external filtering in motor drive noise environments | Select when cost sensitivity outweighs transient immunity needs and bandwidth ≤400kHz suffices |
| MAX40056ASA+T | 100V common-mode, 20V/V gain, ±15µV offset, but only unidirectional output and no REF1/REF2 flexibility | Lacks bidirectional capability and programmable output centering - limits use to single-quadrant current sensing | Choose for space-constrained designs needing 8-pin SOIC footprint where bidirectionality is unnecessary |
Compared with INA241A2IDR, INA240A2IDR trades PWM rejection and bandwidth for lower cost, while MAX40056ASA+T sacrifices bidirectional operation and reference flexibility for integrated fault flag output - making INA241A2IDR optimal for high-fidelity, bidirectional, high-dV/dt current measurement.
Availability
INA241A2IDR is available at Aetrix Electronics and suitable for motor drives, cordless power tools, and drone ESC designs requiring stable component supply, long-term manufacturability, and guaranteed traceability through TI's qualified production line.
Supply support for INA241A2IDR 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-accuracy, high-common-mode current sensing in noisy switching environments - targeting motor control, power tool, and industrial actuation systems demanding sub-µV offset stability and robust PWM immunity.
FAQ
What is the maximum common-mode voltage the INA241A2IDR can withstand during operation?
The INA241A2IDR supports an operational common-mode input range of −5V to 110V per its datasheet (SBOSA30D). It also survives transient exposure up to −20V to 120V. This allows direct connection to 48V, 60V, or 100V bus lines in motor drives and industrial power tools without external protection circuitry - provided the supply voltage remains within 2.7V–20V and output swing limits are observed.
Does the INA241A2IDR require external components for basic bidirectional current sensing?
No. The INA241A2IDR achieves true bidirectional sensing using only its internal REF1 and REF2 pins: connecting REF1 to VS and REF2 to GND centers the output at VS/2, enabling symmetric positive/negative current representation. No external op-amps, resistors, or level shifters are needed - simplifying layout and improving measurement consistency in applications like cordless tool battery monitoring.
How does the enhanced PWM rejection in the INA241A2IDR improve system reliability?
The INA241A2IDR's enhanced PWM rejection holds output stability for 1µs during large dV/dt common-mode transients (e.g., MOSFET switching edges), then attenuates residual disturbance via 104dB AC-CMRR at 100kHz. In motor drives, this prevents false overcurrent trips and ADC saturation - directly increasing mean time between failures (MTBF) in drone ESCs and medical cordless tools operating at 20–125kHz PWM frequencies.
Can the INA241A2IDR be used with a 3.3V microcontroller ADC without signal conditioning?
Yes. With VS = 3.3V and REF1 = 3.3V / REF2 = 0V, the INA241A2IDR outputs 0.02V to 3.1V for ±100mV sensed differential voltage (±5mA at 20mΩ shunt), fully covering a 3.3V ADC range. Its 20mV GND swing and 200mV VS headroom ensure monotonic digitization - eliminating need for external rail-to-rail buffers in compact power tool PCBs.
What is the thermal performance of the INA241A2IDR in SOIC-8 package at full load?
In SOIC-8 (D package), the INA241A2IDR has RθJA = 122.9°C/W and RθJB = 68.8°C/W. At 2.5mA quiescent current and ambient 85°C, junction temperature rise is <31°C - well below the 150°C absolute max. For sustained 125°C ambient operation, board-level copper pour and thermal vias reduce θJB further, enabling continuous use in enclosed injection molding controllers without derating.
INA241A2IDR 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:
- 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:
- 8-SOIC
INA241A2IDR FAQ
1.How can I place an order for INA241A2IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241A2IDR 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 INA241A2IDR reliable?
The price and inventory of INA241A2IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241A2IDR is usually 5 days.
3.What payment methods are accepted for INA241A2IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241A2IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241A2IDR?
INA241A2IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241A2IDR 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 INA241A2IDR?
For technical support, including INA241A2IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241A2IDR requirements.
6.How does Aetrix verify that INA241A2IDR is sourced from the original manufacturer or authorized distributors?
All INA241A2IDR 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 INA241A2IDR meets industry standards.
7.What is the process for return or replacement of INA241A2IDR?
All INA241A2IDR units undergo pre-shipment inspection (PSI). If there is an issue with INA241A2IDR, 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 INA241A2IDR part is unused and in its original packaging.
Return procedure for INA241A2IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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