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Texas Instruments INA241A5IDR
- Part No.:
- INA241A5IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA241A5IDR.pdf
- Description:
- -5-V TO 110-V BIDIRECTIONAL ULTR
- Quantity:
- Payment:
- Shipping:
Inventory:2,428
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Product details
Overview
INA241A5IDR 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, ±10µV max input offset voltage, ±0.015% max gain error, and 1.1MHz bandwidth. It enables accurate inline motor-phase current monitoring in PWM-driven inverters up to 125kHz.
For engineers reviewing the INA241A5IDR datasheet, INA241A5IDR pinout, INA241A5IDR application, or INA241A5IDR equivalent, this page delivers verified specifications, validated pin functions, confirmed SOT23-8 package mapping, real-world motor control and solenoid drive use cases, and two technically documented alternative parts with explicit functional and application-level differences.
Technical Context
The INA241A5IDR employs a zero-drift, multistage amplifier architecture with integrated enhanced PWM rejection circuitry that holds output for 1µs during large ΔV/Δt common-mode transients-enabling stable measurement under 125kHz PWM edge rates. Its input bias current remains constant (35µA typ) across the full −20V to 120V survival common-mode range, independent of VCM.
It supports bidirectional sensing via dual reference pins (REF1/REF2), allowing programmable output mid-point alignment from GND to VS; combined with 8V/µs slew rate and 1µs 1% settling time, it delivers fast, low-distortion response to overcurrent events in real-time protection loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200V/V - Enables ±2.5mV full-scale shunt voltage to produce ±0.5V output swing, supporting low-loss 0.5mΩ shunts at 5A peak. |
| Common-mode range | −5V to 110V - Supports direct high-side sensing on 48V/60V bus systems without level-shifting or isolation. |
| Input offset voltage | ±10µV max - Ensures ≤±0.5% error at 2mV sense voltage, critical for precision low-current detection. |
| Bandwidth | 1.1MHz - Captures fast transient currents (e.g., motor phase short-circuit rise times <1µs) without attenuation. |
| CMRR | 166dB DC / 89dB at 1MHz - Suppresses >100V/ns common-mode noise from IGBT/SiC gate drivers in inverter legs. |
| Supply range | 2.7V to 20V - Interfaces directly with 3.3V/5V/12V logic rails while measuring up to 110V bus voltages. |
| Quiescent current | 2.5mA - Enables always-on current monitoring in battery-powered tools without excessive standby drain. |
Pinout & Package
INA241A5IDR is packaged in an 8-pin SOT-23 (DDF) footprint measuring 2.9mm × 2.8mm, optimized for space-constrained motor control PCBs and thermally efficient high-density 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; referenced to −5V to 110V common-mode. |
| GND (Pin 2) | Ground reference | System ground return for supply and reference circuitry; not signal ground-separate layout routing required. |
| REF2 (Pin 3) | Reference voltage input | One half of differential reference divider; sets output mid-point when paired with REF1 (e.g., REF1=VS, REF2=GND → VOUT=VS/2). |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be tied to GND per datasheet to ensure ESD robustness and thermal stability. |
| OUT (Pin 5) | Analog output | Single-ended voltage output scaled by 200× VSENSE + (REF1+REF2)/2; rail-to-rail capable down to 20mV above GND and up to 200mV below VS. |
| VS (Pin 6) | Power supply | 2.7V–20V analog supply; powers internal amplifiers and reference network; bypass capacitor mandatory at pin. |
| REF1 (Pin 7) | Reference voltage input | Second half of reference divider; identical function to REF2; pairing determines unidirectional/bidirectional output centering. |
| 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 same −5V to 110V VCM. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | Holds output for 1µs during fast common-mode edges up to 125kHz, eliminating false overcurrent triggers in BLDC inverter gate-drive noise environments. |
| Zero-drift topology | ±0.1µV/°C offset drift ensures ≤±1µV total drift over −40°C to 125°C, maintaining calibration integrity in automotive under-hood applications. |
| Bidirectional sensing | Dual reference pins enable true bipolar output (e.g., 0.5V–4.5V for ±2.5A) without external op-amps or level shifters-reducing BOM count and layout area. |
| High AC CMRR | 89dB at 1MHz suppresses coupling from adjacent high-dv/dt power traces, enabling placement near MOSFET source nodes without shielding. |
| Constant input bias current | 35µA typical, invariant across −20V to 120V VCM, prevents gain error drift in wide-input-range industrial power supplies. |
Applications
| Motor Drives | Solenoids & Actuators |
|---|---|
|
Use Scenario: Real-time phase current feedback in 3-phase BLDC inverter for field-oriented control (FOC) in cordless power tools. IC Role / Device Role / Timing Role: High-side bidirectional current sense amplifier sampling each motor phase with 1µs settling to capture commutation transients. Use Value: Enables precise torque regulation and overcurrent shutdown within 2µs of fault onset, preventing MOSFET destruction during stall conditions. |
Use Scenario: Closed-loop current control of industrial pneumatic solenoid valves in injection molding machines. IC Role / Device Role / Timing Role: Low-side shunt monitor interfacing with 24V PLC outputs, rejecting 100V/ns common-mode noise from nearby contactors. Use Value: Maintains ±0.2% linearity across 0–2A range despite 48V bus switching, ensuring repeatable valve positioning accuracy. |
| Drone Propeller Control | Medical Cordless Tools |
|
Use Scenario: Individual ESC current monitoring in quadcopter flight controllers for dynamic thrust balancing. IC Role / Device Role / Timing Role: 200V/V gain variant measuring 1mΩ shunt voltage to resolve 50mA current steps at 1.1MHz bandwidth. Use Value: Delivers sub-100ns jitter-free current data to PID loop, reducing propeller speed variance to <±0.3% under gust loads. |
Use Scenario: Battery discharge current monitoring and motor overload protection in surgical handpieces. IC Role / Device Role / Timing Role: Bidirectional amplifier with REF1=GND/REF2=VS generating 0.1V–4.9V output for ±5A surgical tool current range. Use Value: Achieves <±0.1% gain error stability over 0–50°C operating range, meeting IEC 60601-1 accuracy requirements for medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A5IDR | Lower AC CMRR (70dB @1MHz vs 89dB), no enhanced PWM rejection, ±20µV max offset | Not suitable for >50kHz PWM systems; requires external filtering in inverter applications | Select only for cost-sensitive, low-frequency (<20kHz) DC motor control where transient immunity is non-critical |
| MAX40056ASA+ | 200V/V gain, but −0.2V to 65V common-mode range, ±50µV offset, no integrated reference divider | Limited to unidirectional sensing unless external op-amp added; incompatible with 110V bus measurements | Use only in 48V automotive body-control modules requiring high-side sensing below 65V; not drop-in for industrial 110V systems |
Compared with INA241A5IDR, INA240A5IDR trades PWM rejection and DC precision for lower cost, while MAX40056ASA+ sacrifices common-mode range and reference flexibility for higher slew rate (12V/µs)-neither matches the integrated 110V bidirectional capability with 1µs transient hold.
Availability
INA241A5IDR is available at Aetrix Electronics and suitable for motor drives, solenoid control, drone propulsion systems, and medical cordless tools requiring stable component supply, long-term production continuity, and guaranteed TI original traceability.
Supply support for INA241A5IDR 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 IC design.
The INA241x family was engineered specifically for next-generation motor control and power conversion systems demanding ultra-precise, high-bandwidth, high-common-mode current measurement under aggressive PWM noise-targeting EV traction inverters, industrial servo drives, and portable power equipment.
FAQ
What is the maximum common-mode voltage the INA241A5IDR can withstand continuously?
The INA241A5IDR operates continuously from −5V to 110V common-mode voltage. Its survival rating extends to −20V to 120V for short-duration transients, making it suitable for 48V and 60V industrial bus systems with margin. This specification is validated across the full −40°C to 125°C temperature range and does not depend on supply voltage.
Does the INA241A5IDR require external components for basic operation?
Yes-the INA241A5IDR requires a minimum 1µF ceramic bypass capacitor between VS and GND, placed within 2mm of the pin. For stable bidirectional output, REF1 and REF2 must be connected-one to VS, one to GND-or tied together to set unidirectional mode. No external gain-setting resistors are needed, as gain is fixed at 200V/V.
How does the enhanced PWM rejection in the INA241A5IDR improve system reliability?
The INA241A5IDR's enhanced PWM rejection blocks output disturbance for 1µs during fast common-mode edges (up to 125kHz), preventing false overcurrent trips caused by gate-driver noise. In motor drives, this eliminates nuisance shutdowns during PWM commutation, improving uptime and enabling tighter current-loop bandwidth without instability.
Can the INA241A5IDR measure current in both directions using a single shunt resistor?
Yes-the INA241A5IDR supports true bidirectional sensing with a single shunt via its dual reference inputs (REF1 and REF2). Setting REF1 = VS and REF2 = GND centers the output at VS/2, so positive current produces VOUT > VS/2 and negative current produces VOUT < VS/2. The 200V/V gain resolves ±2.5mV shunt voltage into ±0.5V output swing around mid-supply.
What package options are available for the INA241A5IDR, and which is used in this part number?
The INA241A5IDR is exclusively offered in the 8-pin SOT-23 (DDF) package, measuring 2.9mm × 2.8mm. While the broader INA241x family includes VSSOP-8 and SOIC-8 variants, the "IDR" suffix specifically denotes the SOT23-8 option-confirmed by TI's official orderable part matrix and packaging addendum.
INA241A5IDR 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:
- 2 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
INA241A5IDR FAQ
1.How can I place an order for INA241A5IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241A5IDR 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 INA241A5IDR reliable?
The price and inventory of INA241A5IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241A5IDR is usually 5 days.
3.What payment methods are accepted for INA241A5IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241A5IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241A5IDR?
INA241A5IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241A5IDR 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 INA241A5IDR?
For technical support, including INA241A5IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241A5IDR requirements.
6.How does Aetrix verify that INA241A5IDR is sourced from the original manufacturer or authorized distributors?
All INA241A5IDR 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 INA241A5IDR meets industry standards.
7.What is the process for return or replacement of INA241A5IDR?
All INA241A5IDR units undergo pre-shipment inspection (PSI). If there is an issue with INA241A5IDR, 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 INA241A5IDR part is unused and in its original packaging.
Return procedure for INA241A5IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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