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Texas Instruments INA241B4IDGKR
- Part No.:
- INA241B4IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA241B4IDGKR.pdf
- Description:
- -5-V TO 110-V BIDIRECTIONAL HIGH
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
INA241B4IDGKR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-voltage switching systems. It operates across −5V to 110V common-mode voltage, delivers 100V/V fixed gain, achieves 1.1MHz bandwidth and 8V/µs slew rate, and supports PWM rejection up to 125kHz - enabling accurate inline motor current monitoring in cordless power tools.
For engineers reviewing the INA241B4IDGKR datasheet, INA241B4IDGKR pinout, INA241B4IDGKR application, or INA241B4IDGKR equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions for VSSOP-8 layout, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The INA241B4IDGKR uses a zero-drift, multistage amplifier architecture that maintains 1.1MHz small-signal bandwidth across all gains while rejecting fast common-mode transients via integrated PWM rejection circuitry. Its input bias current remains constant (35µA typ) over −20V to 120V survival range, independent of VCM.
It implements dual reference inputs (REF1/REF2) to configure unidirectional or bidirectional output offset, with internal precision resistor matching ensuring ±0.01% reference divider accuracy for INA241A variants and ±0.15% for INA241B. The device draws only 2.5mA quiescent current from a 2.7V–20V supply and operates from −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100V/V - sets full-scale output at 100mV input drop; enables use of low-value shunts (e.g., 1mΩ) for 1A full-scale with 100mV output swing. |
| Common-mode range | −5V to 110V operational - supports high-side sensing in 48V/60V bus systems and low-side sensing with negative rail capability. |
| Bandwidth | 1.1MHz - ensures sub-microsecond response to overcurrent events; critical for closed-loop motor control loop stability. |
| Input offset voltage | ±150µV max - limits measurement error to ≤0.15% at 100mV sense drop; sufficient for <1% accuracy in 10A–100A applications. |
| Gain error | ±0.1% max - contributes ≤0.1% absolute current error independent of temperature; drift of ±5ppm/°C adds ≤0.05% over −40°C to +125°C. |
| Supply voltage | 2.7V to 20V - compatible with 3.3V, 5V, and 12V system rails; output swing limited to GND+20mV to VS−70mV. |
| PWM rejection | Up to 125kHz - suppresses switching noise from MOSFET gate drivers without external filtering; eliminates need for RC snubbers at input. |
Pinout & Package
DGK package: 8-pin VSSOP (3mm × 4.9mm), thermally enhanced for high-reliability motor control PCBs. Pin 4 (NC) must be connected to GND per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (Pin 1) | Negative current-sense input | Connect to load side (high-side) or ground side (low-side); differential input with IN+ defines VSENSE. |
| GND (Pin 2) | Ground reference | System ground return; required for REF1/REF2 reference divider and output swing reference. |
| REF2 (Pin 3) | Reference voltage input | Paired with REF1 to set output mid-point; for bidirectional operation, tie REF1 to VS and REF2 to GND. |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be externally tied to GND to ensure stable operation and EMI performance. |
| OUT (Pin 5) | Analog output | Voltage = 100 × (IN+ − IN−) + (REF1 + REF2)/2; drives ADC inputs or comparator thresholds directly. |
| VS (Pin 6) | Power supply | 2.7V–20V single supply; powers internal amplifier and reference network; decoupling capacitor required. |
| REF1 (Pin 7) | Reference voltage input | Matches REF2 function; differential reference pair enables precise zero-current output offset adjustment. |
| IN+ (Pin 8) | Positive current-sense input | Connect 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 | Suppresses common-mode transients up to 125kHz without signal distortion - eliminates need for external common-mode chokes in BLDC motor inverters. |
| Zero-drift topology | ±150µV max offset and ±0.5µV/°C drift - enables accurate current measurement down to 10mA using 10mΩ shunt at full temperature range. |
| Bidirectional sensing | Configurable output polarity via REF1/REF2 - supports regenerative braking detection in power tools and drones without external op-amps. |
| Constant input bias current | 35µA typical, independent of VCM - avoids gain error shift in high-common-mode applications like 48V battery packs. |
| High AC CMRR | 104dB at 100kHz - rejects noise from adjacent switching regulators and gate drivers, improving ADC effective resolution by ≥10 bits. |
Applications
| Motor Drives | Solenoids & Actuators |
|---|---|
|
Use Scenario: Real-time phase current sensing in 3-phase BLDC motor controllers for cordless drills and angle grinders. IC Role / Device Role / Timing Role: High-side current sense amplifier providing isolated, bidirectional analog feedback to MCU ADC with <1µs settling time. Use Value: Enables precise torque control and overcurrent shutdown within 2µs, preventing MOSFET failure during stall conditions. |
Use Scenario: Monitoring coil current in industrial pneumatic solenoid valves operating from 24V–48V DC supplies. IC Role / Device Role / Timing Role: Low-drift, high-CMRR amplifier measuring bidirectional inrush and hold currents with ±0.5% linearity. Use Value: Detects coil degradation and open-circuit faults before mechanical failure, extending valve service life by >30%. |
| Injection Molding Machines | Drone Propeller Speed Control |
|
Use Scenario: Closed-loop current regulation of hydraulic pump motors in high-precision plastic injection systems. IC Role / Device Role / Timing Role: Ultra-stable 100V/V gain amplifier interfacing 0.5mΩ shunt to 16-bit sigma-delta ADC at 10ksps. Use Value: Reduces shot-to-shot weight variation to ±0.05g by maintaining ±0.2A current accuracy across 0–150A range. |
Use Scenario: Individual ESC current monitoring in quadcopter flight controllers with 11.1V LiPo input and 30A peak loads. IC Role / Device Role / Timing Role: Fast-settling (1µs to 1%) current sensor feeding real-time PID loop for propeller RPM stabilization. Use Value: Improves hover stability by suppressing PWM-induced current ripple, reducing attitude drift by 40% in gusty conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A4IDR | Same 100V/V gain, but ±10µV max offset (vs ±150µV), ±0.01% gain error (vs ±0.1%), and no enhanced PWM rejection circuitry. | Requires external RC filtering for 100kHz+ switching noise; suited for non-PWM linear supplies or low-frequency motor control. | Select when highest DC accuracy is required and PWM frequency ≤20kHz; avoid in high-speed BLDC or drone ESC designs. |
| MAX40056ATA+T | 100V/V gain, −5V to 65V common-mode range (vs −5V to 110V), 2.5MHz bandwidth, but only unidirectional output and no REF1/REF2 configuration. | Limited to high-side sensing only; cannot support regenerative current measurement without external level-shifting circuitry. | Choose for cost-sensitive 48V systems where bidirectionality is unnecessary and higher bandwidth justifies reduced VCM margin. |
Compared with INA241B4IDGKR, INA240A4IDR offers superior DC precision but lacks transient immunity for modern PWM-driven motors, while MAX40056ATA+T trades common-mode range and bidirectionality for raw speed - making INA241B4IDGKR the only option supporting 110V high-side sensing with integrated PWM rejection and configurable output polarity.
Availability
INA241B4IDGKR is available at Aetrix Electronics and suitable for motor drives, solenoid controls, injection molding machines, and drone propulsion systems requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for INA241B4IDGKR 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 family was designed specifically for high-voltage, high-speed bidirectional current sensing in next-generation motor control, power tool, and robotics applications demanding both accuracy and robustness against switching noise.
FAQ
What is the maximum common-mode voltage the INA241B4IDGKR can withstand continuously?
The INA241B4IDGKR supports continuous operation from −5V to 110V common-mode voltage. Its survival rating extends to −20V to 120V, allowing brief exposure to transients beyond operational limits without damage. This makes INA241B4IDGKR suitable for 48V and 60V battery systems with significant ground bounce or inductive kickback.
Does the INA241B4IDGKR require external components for basic operation?
Yes - INA241B4IDGKR requires a 0.1µF ceramic decoupling capacitor between VS and GND, and Pin 4 (NC) must be connected to GND. For bidirectional operation, REF1 and REF2 should be tied to VS and GND respectively; no external resistors or filters are needed for PWM rejection, unlike legacy current sense amplifiers.
How does the enhanced PWM rejection in the INA241B4IDGKR improve system reliability?
The enhanced PWM rejection in INA241B4IDGKR holds its output stable for 1µs during large common-mode transients and attenuates residual disturbances via 104dB AC CMRR at 100kHz. This prevents false overcurrent triggers in motor controllers and eliminates need for input RC filters that degrade bandwidth - directly increasing system uptime and reducing firmware complexity.
Can the INA241B4IDGKR measure current in both directions with a single shunt resistor?
Yes - INA241B4IDGKR supports true bidirectional sensing using one shunt. By setting REF1 = VS and REF2 = GND, the output centers at VS/2: positive current yields VOUT > VS/2, negative current yields VOUT < VS/2. This enables regenerative braking detection in power tools and drones without additional hardware.
What is the thermal performance of the INA241B4IDGKR in VSSOP-8 package?
In DGK (VSSOP-8) package, INA241B4IDGKR has RθJA = 167.2°C/W and RθJB = 88.9°C/W. At 2.5mA quiescent current and 100mA output load, junction temperature rise stays below 15°C above ambient on standard 2-layer PCB - well within −40°C to +125°C operating range even in enclosed power tool housings.
INA241B4IDGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-VSSOP
INA241B4IDGKR FAQ
1.How can I place an order for INA241B4IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241B4IDGKR 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 INA241B4IDGKR reliable?
The price and inventory of INA241B4IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241B4IDGKR is usually 5 days.
3.What payment methods are accepted for INA241B4IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241B4IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241B4IDGKR?
INA241B4IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241B4IDGKR 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 INA241B4IDGKR?
For technical support, including INA241B4IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241B4IDGKR requirements.
6.How does Aetrix verify that INA241B4IDGKR is sourced from the original manufacturer or authorized distributors?
All INA241B4IDGKR 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 INA241B4IDGKR meets industry standards.
7.What is the process for return or replacement of INA241B4IDGKR?
All INA241B4IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with INA241B4IDGKR, 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 INA241B4IDGKR part is unused and in its original packaging.
Return procedure for INA241B4IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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