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Texas Instruments INA241B3IDR
- Part No.:
- INA241B3IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA241B3IDR.pdf
- Description:
- -5-V TO 110-V BIDIRECTIONAL HIGH
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
INA241B3IDR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-voltage switching systems with fast common-mode transients. It operates from −5V to 110V common-mode voltage, delivers 50V/V fixed gain, achieves 1.1MHz bandwidth and 8V/µs slew rate, and supports PWM rejection up to 125kHz - enabling accurate inline motor-phase current measurement in industrial inverters.
For engineers reviewing the INA241B3IDR datasheet, INA241B3IDR pinout, INA241B3IDR application, or INA241B3IDR equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions across SOT23-8/VSSOP-8/SOIC-8 packages, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The INA241B3IDR uses a zero-drift, multistage amplifier architecture with enhanced PWM rejection circuitry that holds output for 1µs during large ΔV/Δt common-mode transients (e.g., gate-drive edge transitions), then relies on 104dB AC-CMRR at 100kHz and 1.1MHz bandwidth to suppress residual disturbance. Its input bias current remains constant at 35µA (typ) across −20V to 120V survival range, independent of VCM.
This device implements dual reference inputs (REF1/REF2) to configure unidirectional or bidirectional output swing - e.g., connecting REF1 to VS and REF2 to GND sets mid-supply output offset - while maintaining ±150µV max input offset and ±0.1% max gain error over −40°C to 125°C, making it suitable for closed-loop current control where signal integrity under EMI-rich switching conditions is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V - enables 20mV shunt drop to produce 1V full-scale output, reducing I²R loss in high-current motor phases. |
| Common-mode range | −5V to 110V operational - supports direct high-side sensing in 48V/60V bus systems without level-shifting. |
| Small-signal bandwidth | 1.1MHz at all gains - captures fast overcurrent events (e.g., short-circuit detection within 1µs settling to 1%). |
| Input offset voltage | ±150µV max - limits current measurement error to ≤3mA when using 5mΩ shunt at room temperature. |
| Supply voltage | 2.7V to 20V - compatible with 3.3V/5V/12V logic rails while sensing on >100V power stages. |
| Quiescent current | 2.5mA typical - enables low-power operation in always-on monitoring circuits without thermal derating. |
| PWM rejection limit | 125kHz - matches typical SiC MOSFET gate drive frequencies, minimizing output corruption during hard-switching. |
Pinout & Package
INA241B3IDR is available in SOIC-8 (D), VSSOP-8 (DGK), and SOT23-8 (DDF) packages. All variants share identical pin numbering and function mapping per TI SBOSA30D Rev D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (Pin 1) | Negative current-sense input | Connect to load side of shunt in high-side config; to ground side in low-side config - defines differential input polarity. |
| GND (Pin 2) | Analog ground reference | Return path for internal circuitry; must be tied to system power ground with low-impedance connection to minimize noise coupling. |
| REF2 (Pin 3) | Reference voltage input | Paired with REF1 to set output DC offset; both pins are symmetrical - used to configure bidirectional (mid-supply) or unidirectional (rail-referenced) output. |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure stable operation and ESD protection. |
| OUT (Pin 5) | Amplified output voltage | Delivers G × (IN+ − IN−) + (REF1 + REF2)/2; swings within 20mV of GND and 200mV below VS into 10kΩ load. |
| VS (Pin 6) | Positive supply input | Accepts 2.7V–20V; powers internal amplifiers and reference network - output compliance depends directly on this rail. |
| REF1 (Pin 7) | Reference voltage input | Identical function to REF2; together they form precision resistive divider determining output baseline - no internal pull-up/down. |
| IN+ (Pin 8) | Positive current-sense input | Connect to bus-voltage side of shunt in high-side config; to load side in low-side config - completes differential measurement path. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | 1µs output hold + 104dB AC-CMRR at 100kHz suppresses gate-drive-induced errors in motor phase current feedback loops. |
| Zero-drift topology | ±0.5µV/°C max offset drift ensures <±1.5mV total offset shift over −40°C to 125°C - critical for thermal-stable torque control. |
| Bidirectional output configuration | Dual REF pins allow precise mid-supply offset setting (e.g., 2.5V on 5V rail) for true bidirectional current sensing without external op-amps. |
| Constant input bias current | 35µA (typ) independent of VCM - avoids gain error drift when sensing across wide bus voltages (e.g., 0–80V in battery-powered tools). |
| High-speed settling | 1µs to 1% for 0.5V–4.5V step - enables real-time overcurrent shutdown in <2µs, meeting IEC 61800-5-2 functional safety timing requirements. |
Applications
| Motor Drives | Solenoids & Actuators |
|---|---|
|
Use Scenario: Real-time phase current monitoring in 3-phase BLDC inverter for field-oriented control (FOC). IC Role / Device Role / Timing Role: High-side bidirectional current sense amplifier with 1.1MHz bandwidth and 1µs settling, placed inline with each motor phase leg. Use Value: Enables accurate torque estimation and fast overcurrent protection (<2µs response) despite 100V/ns common-mode transients from SiC switches. |
Use Scenario: Closed-loop current regulation in industrial hydraulic solenoid valves with PWM-driven coils. IC Role / Device Role / Timing Role: Low-side current monitor interfacing to microcontroller ADC, rejecting 48V bus switching noise. Use Value: Maintains ±0.5% current accuracy across −40°C to 125°C ambient, eliminating need for temperature compensation firmware. |
| Injection Molding Machines | Drone Propeller Speed Control |
|
Use Scenario: High-precision heater cartridge current sensing for PID temperature control in multi-zone heating manifolds. IC Role / Device Role / Timing Role: Bidirectional amplifier measuring resistive heater current during AC half-cycle conduction and zero-crossing intervals. Use Value: 50V/V gain + ±150µV offset enables sub-10mA resolution on 100mΩ shunts, improving thermal uniformity to ±0.3°C. |
Use Scenario: Individual ESC current feedback in quadcopter flight controllers for dynamic thrust balancing. IC Role / Device Role / Timing Role: Compact SOT23-8 current sensor mounted directly on ESC PCB, rejecting motor commutation noise. Use Value: 125kHz PWM rejection prevents false overcurrent trips during aggressive yaw maneuvers, increasing flight stability margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A3IDR | Same 50V/V gain, but ±120µV max offset and ±0.2% gain error - lower precision than INA241B3IDR's ±150µV/±0.1%. | Limited to ≤100kHz PWM rejection; lacks 1µs hold feature - less robust in SiC-based motor drives. | Select when cost sensitivity outweighs need for highest DC accuracy and fastest transient immunity. |
| MAX40056ASA+T | 50V/V gain, ±100µV offset, but only −4V to 65V common-mode range - cannot support 80V+ bus voltages. | Optimized for automotive 12V/48V systems; no enhanced PWM rejection circuitry - higher susceptibility to gate-drive noise. | Choose for space-constrained automotive body control modules where 65V ceiling is sufficient and TI ecosystem integration is not required. |
Compared with INA241B3IDR, INA240A3IDR trades precision and PWM immunity for lower cost, while MAX40056ASA+T sacrifices common-mode range and transient rejection to meet AEC-Q100 requirements - neither offers drop-in replacement capability due to differing pinouts and reference architecture.
Availability
INA241B3IDR is available at Aetrix Electronics and suitable for motor drives, solenoid control, injection molding machines, cordless power tools, and drone propulsion systems requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for INA241B3IDR 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 designed specifically for high-voltage, high-speed current sensing in next-generation motor control, energy storage, and industrial automation systems demanding ultra-low drift and robustness against fast common-mode transients.
FAQ
What is the maximum common-mode voltage the INA241B3IDR can withstand during continuous operation?
The INA241B3IDR supports −5V to 110V common-mode voltage during normal operation, with survival rating up to −20V to 120V per absolute maximum ratings. This allows direct high-side sensing on 48V, 60V, and 80V industrial buses without external attenuation or isolation - a key advantage over legacy current sense amplifiers limited to supply-rail-referenced ranges.
Does the INA241B3IDR require external components for basic operation?
No, the INA241B3IDR operates with only bypass capacitors: a 100nF ceramic capacitor between VS and GND, and optionally a 10nF capacitor on each REF pin if high-frequency noise is present. Its integrated zero-drift architecture, matched internal resistors, and dual-reference input eliminate need for external trimming, offset nulling, or gain-setting resistors - simplifying layout and reducing BOM count.
How does the enhanced PWM rejection in the INA241B3IDR improve motor control reliability?
The INA241B3IDR's enhanced PWM rejection holds its output stable for 1µs during large common-mode transients (e.g., SiC FET turn-on edges), then attenuates residual disturbance via 104dB AC-CMRR at 100kHz and 1.1MHz bandwidth. This prevents false overcurrent triggers and maintains clean FOC current waveforms - demonstrated in TI's SBOSA30D Figure 7-1 with <10mV output perturbation under 100V/µs dV/dt stress.
Can the INA241B3IDR measure bidirectional current without external circuitry?
Yes. By connecting REF1 to VS and REF2 to GND, the INA241B3IDR configures its output to swing symmetrically around mid-supply (e.g., 2.5V on 5V rail), enabling true bidirectional current measurement - positive current raises output above mid-point, negative current lowers it - all within a single IC, with no external op-amps or level-shifters required.
What package options are available for the INA241B3IDR, and how do they differ thermally?
The INA241B3IDR is offered in SOIC-8 (D), VSSOP-8 (DGK), and SOT23-8 (DDF). Thermal resistance differs significantly: SOIC-8 has RθJA = 122.9°C/W, VSSOP-8 is 167.2°C/W, and SOT23-8 is 129.7°C/W. For high-power-density designs like compact ESCs, SOIC-8 provides best junction-to-ambient performance; VSSOP-8 suits space-constrained layouts but requires careful thermal pad design.
INA241B3IDR 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
INA241B3IDR FAQ
1.How can I place an order for INA241B3IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241B3IDR 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 INA241B3IDR reliable?
The price and inventory of INA241B3IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241B3IDR is usually 5 days.
3.What payment methods are accepted for INA241B3IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241B3IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241B3IDR?
INA241B3IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241B3IDR 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 INA241B3IDR?
For technical support, including INA241B3IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241B3IDR requirements.
6.How does Aetrix verify that INA241B3IDR is sourced from the original manufacturer or authorized distributors?
All INA241B3IDR 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 INA241B3IDR meets industry standards.
7.What is the process for return or replacement of INA241B3IDR?
All INA241B3IDR units undergo pre-shipment inspection (PSI). If there is an issue with INA241B3IDR, 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 INA241B3IDR part is unused and in its original packaging.
Return procedure for INA241B3IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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