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Texas Instruments INA241B2IDR
- Part No.:
- INA241B2IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA241B2IDR.pdf
- Description:
- -5-V TO 110-V BIDIRECTIONAL HIGH
- Quantity:
- Payment:
- Shipping:
Inventory:2,442
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Product details
Overview
INA241B2IDR 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, ±0.1% max gain error, ±150µV max input offset voltage, and enhanced PWM rejection up to 125kHz - deployed in motor drives and cordless power tools for accurate inline current monitoring under fast transients.
For engineers reviewing the INA241B2IDR datasheet, INA241B2IDR pinout, INA241B2IDR application, or INA241B2IDR equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions across SOT23-8 packaging, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The INA241B2IDR 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 - critical for overcurrent detection in PWM-driven motor control. Its enhanced PWM rejection circuitry actively suppresses common-mode transients by holding output for 1µs during large ΔV/Δt edges, then leveraging high AC-CMRR (104dB @ 100kHz) for residual attenuation.
It supports bidirectional sensing via dual reference inputs (REF1/REF2), allowing configurable output centering from GND to VS; operates from 2.7V–20V supply with 2.5mA quiescent current; and maintains stable input bias current (35µA typ.) across its full −20V to 120V survival common-mode range - independent of VCM or supply voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V - sets output scaling for 50mV shunt drop → 1V full-scale, optimizing dynamic range with low-resistance shunts. |
| Common-mode range | −5V to 110V - enables direct high-side sensing on 48V/60V bus systems without level-shifting or isolation. |
| Gain error (max) | ±0.1% - limits full-scale current measurement error to ≤1mA per amp of sensed current at room temperature. |
| Input offset voltage (max) | ±150µV - ensures ≤7.5µA error in 50mΩ shunt-based 10A measurement at 25°C. |
| Small-signal bandwidth | 1.1MHz - captures fast current transients (e.g., MOSFET switching edges) without phase lag or amplitude loss. |
| PWM rejection frequency limit | 125kHz - fully suppresses common-mode noise from typical BLDC motor gate drivers and Class-D amplifiers. |
| Supply voltage range | 2.7V to 20V - compatible with 3.3V microcontroller I/O and 12V/15V industrial rails without external regulators. |
Pinout & Package
SOT23-8 package (DDF), 2.9mm × 2.8mm footprint, thermally enhanced for PCB space-constrained motor control modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (Pin 1) | Current-sense negative input | Connects to load side (high-side) or ground side (low-side); defines differential sense node with IN+. |
| GND (Pin 2) | Ground reference | System ground return for supply and output; must be low-impedance path to minimize measurement error. |
| REF2 (Pin 3) | Reference voltage input | Paired with REF1 to set output mid-point; tied to GND for unidirectional mode or VS for inverted output. |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure stability and EMI performance. |
| OUT (Pin 5) | Analog output | 20×(IN+ − IN−) + (REF1 + REF2)/2; rail-to-rail capable with 20mV headroom to GND and 200mV to VS. |
| VS (Pin 6) | Power supply | 2.7V–20V single supply; powers internal amplifier and reference network; bypass with 100nF ceramic near pin. |
| REF1 (Pin 7) | Reference voltage input | Matches REF2 function; differential reference pair enables precise bidirectional zero-centering (e.g., ±2.5V out). |
| IN+ (Pin 8) | Current-sense positive input | Connects to bus side (high-side) or load side (low-side); forms differential pair with IN− for VSENSE measurement. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | 1µs output hold + high AC-CMRR (104dB @ 100kHz) eliminates false overcurrent triggers during MOSFET switching. |
| Zero-drift topology | ±0.5µV/°C max offset drift ensures stable baseline across −40°C to 125°C - critical for battery-powered tool runtime accuracy. |
| Constant input bias current | 35µA typ. independent of VCM - avoids gain error shift when sensing on 110V bus vs. low-side GND-referenced shunt. |
| Bidirectional output configuration | REF1/REF2 pins enable true bipolar output (e.g., 0.5V–4.5V for ±10A) without external op-amps or level-shifters. |
| High-speed transient response | 1µs to 1% settling enables real-time current limiting in <10µs fault windows - essential for IGBT/MOSFET short-circuit protection. |
Applications
| Motor Drives | Solenoids & Actuators |
|---|---|
Use Scenario: Real-time phase current monitoring in 3-phase BLDC motor inverters with 20–100kHz 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 field-oriented control (FOC) with <0.5% current loop error and immunity to 100V/µs common-mode dv/dt noise. |
Use Scenario: Precision coil current regulation in industrial pneumatic solenoid valves driven by H-bridge PWM. IC Role / Device Role / Timing Role: Low-drift, high-CMRR amplifier measuring bidirectional inductive current during energize/de-energize cycles. Use Value: Eliminates need for external offset trimming; maintains ±1.5mA accuracy over full −40°C to 125°C ambient range. |
| Cordless Power Tools | Drone Propeller Speed Control |
Use Scenario: Battery discharge current sensing and overload protection in 18V/20V Li-ion cordless drills and impact drivers. IC Role / Device Role / Timing Role: Inline shunt amplifier feeding safety MCU with fast overcurrent detection (<5µs response) during stall events. Use Value: Supports 50A peak current measurement with ±50mA absolute error, enabling reliable thermal derating and battery SOC estimation. |
Use Scenario: Individual ESC current monitoring in quadcopter platforms using 4S–6S LiPo batteries and 20–50kHz ESC PWM. IC Role / Device Role / Timing Role: High-bandwidth, low-noise current sensor interfacing directly to flight controller ADC for closed-loop thrust balancing. Use Value: Delivers 1.1MHz signal fidelity to resolve rapid current spikes during aggressive yaw maneuvers without aliasing or distortion. |
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 | Same 20V/V gain, but ±0.2% gain error (vs. ±0.1%), ±200µV offset (vs. ±150µV), no enhanced PWM rejection circuitry. | Lacks 125kHz PWM suppression; requires external filtering in high-dv/dt motor drives; suitable for lower-frequency solenoid control. | Select when cost sensitivity outweighs need for fast transient immunity and highest DC precision. |
| MAX40056ASA+T | 20V/V gain, −4V to 110V VCM, ±0.3% gain error, 1.5MHz BW, but only unidirectional output and no REF1/REF2 configuration. | Requires external level-shifting for bidirectional sensing; limited to high-side-only or low-side-only topologies. | Choose when system uses unidirectional current flow and prioritizes bandwidth over output flexibility and CMRR. |
Compared with INA241B2IDR, INA240A2IDR trades PWM robustness and DC accuracy for lower cost, while MAX40056ASA+T offers higher bandwidth but sacrifices bidirectional configurability and common-mode rejection - making INA241B2IDR optimal for precision, high-dv/dt, bidirectional applications like BLDC drives and drone ESCs.
Availability
INA241B2IDR is available at Aetrix Electronics and suitable for motor drives, cordless power tools, and drone propulsion systems requiring stable component supply, long-term production continuity, and guaranteed traceable sourcing.
Supply support for INA241B2IDR 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-voltage, high-speed bidirectional current sensing in switching power stages - targeting motor control, battery management, and industrial actuation where PWM noise immunity and DC accuracy are non-negotiable.
FAQ
What is the maximum common-mode voltage the INA241B2IDR can withstand continuously?
The INA241B2IDR supports continuous operation from −5V to 110V common-mode voltage. Its survival rating extends to −20V to 120V, meaning it tolerates brief transients beyond operational limits without damage - critical for 48V automotive or industrial bus monitoring where load dump or inductive kick can exceed nominal rails.
How does the enhanced PWM rejection in the INA241B2IDR improve motor control reliability?
The INA241B2IDR's enhanced PWM rejection holds its output stable for 1µs during large common-mode dv/dt edges (up to 125kHz), then attenuates residual transients via 104dB AC-CMRR at 100kHz. This prevents false overcurrent trips in BLDC motor drives - ensuring clean current waveforms reach the MCU ADC without post-processing filtering.
Can the INA241B2IDR measure bidirectional current without external components?
Yes. The INA241B2IDR uses REF1 and REF2 pins to configure its output center point. Tying REF1 to VS and REF2 to GND sets OUT to mid-supply (e.g., 2.5V on 5V rail) at zero current - enabling true ± full-scale output for bidirectional shunt sensing without op-amps, resistors, or level shifters.
What is the typical quiescent current of the INA241B2IDR, and how does it vary with supply voltage?
The INA241B2IDR draws 2.5mA typical quiescent current at 25°C, rising to 3.2mA maximum across −40°C to 125°C. It remains stable across its 2.7V–20V supply range - varying less than ±0.1mA from 3.3V to 15V - making it suitable for always-on battery monitoring and low-power industrial nodes.
Which package options are available for the INA241B2IDR, and what is the standard option stocked by Aetrix Electronics?
The INA241B2IDR is offered in SOT23-8 (DDF), VSSOP-8 (DGK), and SOIC-8 (D) packages. Aetrix Electronics stocks the SOT23-8 variant (INA241B2IDR) as the standard option - selected for its compact 2.9mm × 2.8mm footprint, thermal performance, and compatibility with high-density motor control PCB layouts.
INA241B2IDR 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:
- 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:
- 8-SOIC
INA241B2IDR FAQ
1.How can I place an order for INA241B2IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241B2IDR 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 INA241B2IDR reliable?
The price and inventory of INA241B2IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241B2IDR is usually 5 days.
3.What payment methods are accepted for INA241B2IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241B2IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241B2IDR?
INA241B2IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241B2IDR 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 INA241B2IDR?
For technical support, including INA241B2IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241B2IDR requirements.
6.How does Aetrix verify that INA241B2IDR is sourced from the original manufacturer or authorized distributors?
All INA241B2IDR 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 INA241B2IDR meets industry standards.
7.What is the process for return or replacement of INA241B2IDR?
All INA241B2IDR units undergo pre-shipment inspection (PSI). If there is an issue with INA241B2IDR, 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 INA241B2IDR part is unused and in its original packaging.
Return procedure for INA241B2IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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