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Texas Instruments INA241B3IDGKR
- Part No.:
- INA241B3IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA241B3IDGKR.pdf
- Description:
- -5-V TO 110-V BIDIRECTIONAL HIGH
- Quantity:
- Payment:
- Shipping:
Inventory:2,431
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Product details
Overview
INA241B3IDGKR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-voltage switching systems, featuring 50V/V fixed gain, −5V to 110V operational common-mode range, ±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 transient conditions.
For engineers reviewing the INA241B3IDGKR datasheet, INA241B3IDGKR pinout, INA241B3IDGKR application, or INA241B3IDGKR equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions for VSSOP-8 layout, application-specific implementation insights, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The INA241B3IDGKR uses a zero-drift, multistage amplifier architecture enabling 1.1MHz bandwidth at all gains while maintaining 8V/µs slew rate and 1µs 1% settling time. Its enhanced PWM rejection circuitry holds output for 1µs during large ΔV/Δt common-mode transients (e.g., MOSFET switching), then relies on 104dB AC-CMRR at 100kHz to suppress residual disturbance.
It supports bidirectional sensing via dual reference inputs (REF1/REF2), allowing programmable output centering from GND to VS; operates from 2.7V–20V supply with 2.5mA quiescent current; and maintains stable 35µA input bias current across −20V to 120V survival common-mode range - independent of VS or VCM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V - sets full-scale output to 2.5V for 50mV shunt drop; enables use of low-value shunts (e.g., 2mΩ) while preserving SNR in 3.3V systems. |
| Common-mode range | −5V to 110V operational - supports high-side sensing in 48V/60V bus systems (e.g., BLDC motor inverters) without level-shifting. |
| Input offset voltage | ±150µV max - contributes ≤0.3% error at 50mV sense voltage; drift of ±0.5µV/°C limits thermal-induced error in industrial ambient. |
| Bandwidth & settling | 1.1MHz (−3dB), 1µs to 1% - captures overcurrent events in <1.5µs; sufficient for 100kHz PWM with <1 LSB step error in 12-bit ADC sampling. |
| PWM rejection | Valid up to 125kHz - suppresses gate-drive coupling noise in half-bridge motor drivers; output hold + high AC-CMRR prevents false trip in safety-critical current limiting. |
| Supply range | 2.7V to 20V - compatible with 3.3V, 5V, and 12V control rails; output swings within 20mV of GND and 200mV below VS for rail-to-rail interface. |
| Operating temperature | −40°C to +125°C - qualified for under-hood automotive motor control and industrial servo amplifiers without derating. |
Pinout & Package
VSSOP-8 package (DGK): 3mm × 4.9mm body, 0.65mm pitch, exposed thermal pad (not electrically connected); suitable for high-density PCB layouts with thermal relief via stitching.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (Pin 1) | Negative current-sense input | Connect to load side in high-side sensing or ground side in low-side sensing; differential pair input with matched 35µA bias current. |
| GND (Pin 2) | Ground reference | Primary return path for supply and output; tie to system power ground plane with low-inductance connection to minimize noise coupling. |
| REF2 (Pin 3) | Reference voltage input | One half of internal resistor divider; connect to GND or VS to set bidirectional output center point (e.g., VS/2 = 2.5V for 5V supply). |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure stability and ESD robustness. |
| OUT (Pin 5) | Analog output | Single-ended voltage output proportional to sensed current; drives 10kΩ loads directly; requires RC filter if interfacing to SAR ADC. |
| VS (Pin 6) | Positive supply | Accepts 2.7V–20V; bypass with 1µF ceramic + 100nF near pin; output swing limited to VS − 0.2V min. |
| REF1 (Pin 7) | Reference voltage input | Second half of internal divider; paired with REF2 to define output DC offset; identical electrical behavior to REF2. |
| IN+ (Pin 8) | Positive current-sense input | Connect to bus side in high-side sensing or load side in low-side sensing; withstands −20V to 120V survival voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | 1µs output hold + 104dB AC-CMRR at 100kHz eliminates measurement corruption during MOSFET switching edges in motor gate drivers. |
| Bidirectional sensing support | Dual reference inputs (REF1/REF2) enable true zero-centered output (e.g., 2.5V ±2.5V) without external op-amps or level shifters. |
| Stable input bias current | 35µA typical, constant across −20V to 120V VCM - avoids gain error drift when sensing current through high-side shunts in 48V+ systems. |
| Low VSENSE capability | ±150µV offset enables accurate measurement down to 3mV shunt drop (60A @ 50µΩ), reducing I²R loss in battery-powered tools. |
| Wide supply compatibility | 2.7V–20V operation allows direct integration into 3.3V microcontroller domains and 12V/15V analog subsystems without LDO overhead. |
Applications
| Motor Drive Current Monitoring | Solenoid & Actuator Control |
|---|---|
Use Scenario: Real-time phase current measurement in 3-phase BLDC motor inverters using high-side shunts on 48V bus. IC Role / Device Role / Timing Role: Bidirectional current sense amplifier with 1.1MHz bandwidth and 1µs settling, synchronized to PWM carrier for cycle-by-cycle overcurrent protection. Use Value: Enables precise torque control and fast fault shutdown (<2µs response) without external signal conditioning, reducing BOM count by one op-amp stage. |
Use Scenario: Closed-loop current regulation in industrial solenoid valves driven by H-bridge with 100kHz PWM. IC Role / Device Role / Timing Role: High-CMRR amplifier rejecting 100V/µs common-mode transients induced by bridge switching; outputs clean analog signal to MCU ADC. Use Value: Eliminates need for isolated amplifiers or digital current sensors, cutting cost and board area while maintaining ±1% full-scale accuracy across temperature. |
| Cordless Power Tool Battery Management | Drone Propeller ESC Feedback |
Use Scenario: Bidirectional pack current sensing in 20V–60V cordless drill battery packs during charge/discharge cycles. IC Role / Device Role / Timing Role: Zero-drift amplifier with ±150µV offset and ±0.5µV/°C drift, referenced to mid-supply for symmetric positive/negative current reporting. Use Value: Delivers <0.5% SOC error over −20°C to 60°C ambient, extending usable runtime estimation accuracy without calibration tables. |
Use Scenario: Per-motor current feedback in quadcopter electronic speed controllers operating at 40kHz–80kHz PWM frequency. IC Role / Device Role / Timing Role: PWM-rejecting amplifier with 125kHz immunity and 8V/µs slew rate, capturing rapid current spikes during aggressive throttle changes. Use Value: Prevents false overcurrent trips during dynamic maneuvers, improving flight stability and enabling tighter current loop bandwidth (≥5kHz). |
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 ±10µV max offset (A-grade), 166dB DC-CMRR, and 1.1MHz BW - higher precision, lower drift, no enhanced PWM hold circuit. | Preferred for lab-grade measurement or low-noise servo loops; unsuitable where >100kHz PWM edge rejection is required. | Select INA240A3IDR only if system PWM frequency <50kHz and offset error budget <±20µV; otherwise INA241B3IDGKR provides superior transient immunity. |
| ACS724LMATR-50AB | 50A Hall-effect sensor, ratiometric output, 1.2ms response, ±1.5% total error - galvanically isolated, no shunt resistor needed. | Used where isolation is mandatory (e.g., mains-connected chargers); slower, less accurate, and sensitive to magnetic interference. | Choose ACS724LMATR-50AB only when creepage/clearance requirements prohibit shunt-based sensing; INA241B3IDGKR offers 10× faster response and 5× better accuracy in non-isolated motor control. |
Compared with INA240A3IDR, INA241B3IDGKR trades minor offset precision for robust PWM transient immunity essential in high-frequency motor drives; versus ACS724LMATR-50AB, it delivers microsecond response and shunt-based accuracy without magnetic susceptibility - making it optimal for compact, high-bandwidth embedded motor control.
Availability
INA241B3IDGKR is available at Aetrix Electronics and suitable for motor drives, cordless power tools, and drone ESC designs requiring stable component supply, long-term production continuity, and guaranteed TI original packaging.
Supply support for INA241B3IDGKR 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 chain and high-reliability power management ICs.
The INA241x family 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 wide VCM are critical.
FAQ
What is the maximum common-mode voltage the INA241B3IDGKR can withstand continuously?
The INA241B3IDGKR operates continuously 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 motor phases experiencing load dump or inductive kickback. This rating applies directly to the IN+ and IN− pins of the INA241B3IDGKR.
Does the INA241B3IDGKR require external components for basic operation?
No external components are required for core functionality: the INA241B3IDGKR operates with only a supply decoupling capacitor (1µF + 100nF) on VS and grounded NC pin. REF1/REF2 may be tied to GND/VS for unidirectional output or split for bidirectional centering - no resistors, op-amps, or filters are mandatory. This simplifies layout and reduces bill-of-materials for the INA241B3IDGKR.
How does the enhanced PWM rejection in the INA241B3IDGKR differ from standard CMRR?
Standard CMRR attenuates steady-state common-mode signals, while the INA241B3IDGKR's enhanced PWM rejection actively holds its output for 1µs during fast ΔV/Δt transients (e.g., MOSFET turn-on), then leverages 104dB AC-CMRR at 100kHz to suppress residual ringing - a two-stage defense absent in conventional amplifiers. This behavior is explicitly characterized in the INA241B3IDGKR datasheet Figure 7-1.
Can the INA241B3IDGKR measure current in both directions with a single shunt resistor?
Yes - the INA241B3IDGKR supports true bidirectional sensing using one shunt by configuring REF1 and REF2 to set output center voltage (e.g., REF1 = VS, REF2 = GND → VOUT = VS/2 at zero current). Positive and negative VSENSE produce symmetric output excursions, enabling accurate net current calculation in battery charge/discharge monitoring with the INA241B3IDGKR.
What package type is used for the INA241B3IDGKR, and why is thermal performance important?
The INA241B3IDGKR uses the DGK (VSSOP-8) package: 3mm × 4.9mm, 0.65mm pitch, with an exposed thermal pad. Its RθJA is 167.2°C/W - meaning junction temperature rises ~167°C per watt dissipated. At 2.5mA supply current and 5V supply, power dissipation is ~12.5mW, resulting in negligible self-heating; however, layout with thermal vias under the pad ensures reliability in high-ambient environments where the INA241B3IDGKR operates.
INA241B3IDGKR 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
INA241B3IDGKR FAQ
1.How can I place an order for INA241B3IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241B3IDGKR 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 INA241B3IDGKR reliable?
The price and inventory of INA241B3IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241B3IDGKR is usually 5 days.
3.What payment methods are accepted for INA241B3IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241B3IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241B3IDGKR?
INA241B3IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241B3IDGKR 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 INA241B3IDGKR?
For technical support, including INA241B3IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241B3IDGKR requirements.
6.How does Aetrix verify that INA241B3IDGKR is sourced from the original manufacturer or authorized distributors?
All INA241B3IDGKR 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 INA241B3IDGKR meets industry standards.
7.What is the process for return or replacement of INA241B3IDGKR?
All INA241B3IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with INA241B3IDGKR, 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 INA241B3IDGKR part is unused and in its original packaging.
Return procedure for INA241B3IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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