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Texas Instruments INA241B2IDGKR
- Part No.:
- INA241B2IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA241B2IDGKR.pdf
- Description:
- -5-V TO 110-V BIDIRECTIONAL HIGH
- Quantity:
- Payment:
- Shipping:
Inventory:1,675
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Product details
Overview
INA241B2IDGKR 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 drive current monitoring where precision under fast transients is critical.
For engineers reviewing the INA241B2IDGKR datasheet, INA241B2IDGKR pinout, INA241B2IDGKR application, or INA241B2IDGKR equivalent, this page delivers verified specifications, VSSOP-8 package details, real-world use cases in solenoid control and drone propulsion, and validated alternative options for design-in flexibility.
Technical Context
The INA241B2IDGKR 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. 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 subsequent attenuation.
It supports bidirectional sensing via dual reference pins (REF1/REF2), allowing configurable 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 supply or input voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V - sets full-scale output to 2V for 100mV shunt drop, optimizing SNR and dynamic range in mid-current applications. |
| Common-mode range | −5V to 110V - enables direct high-side sensing in 48V/60V industrial buses without level-shifting or isolation. |
| Gain error | ±0.1% max - ensures <±2mV absolute error at 2V output, critical for closed-loop torque accuracy in motor drives. |
| Input offset voltage | ±150µV max - supports accurate low-current measurement down to ~7.5mA with 20mΩ shunt at room temperature. |
| Small-signal bandwidth | 1.1MHz - captures fast overcurrent events (e.g., MOSFET short-circuit rise times <300ns) without phase lag. |
| PWM rejection | Up to 125kHz - eliminates output disturbance from gate-drive switching in BLDC inverters and solenoid drivers. |
| Supply voltage | 2.7V to 20V - interoperates with 3.3V microcontrollers and 12V/15V system rails without LDO overhead. |
Pinout & Package
VSSOP-8 (DGK) package: 3mm × 4.9mm body, 0.65mm pitch, exposed thermal pad (not electrically connected), RoHS-compliant, rated for −40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (Pin 1) | Negative current-sense input | Connects to load side of shunt in high-side config; ground side in low-side - defines differential input polarity for bidirectional current sign. |
| GND (Pin 2) | Analog ground reference | Return path for internal circuitry; must tie to clean system ground near shunt to minimize noise coupling. |
| REF2 (Pin 3) | Reference voltage input | One half of precision divider network; paired with REF1 to set output DC offset (e.g., 0V for unidirectional, VS/2 for bidirectional). |
| 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) | Amplified output | Delivers 20×(IN+ − IN−) + (REF1 + REF2)/2; rail-to-rail swing (20mV to VS−70mV) interfaces directly with SAR ADCs or comparators. |
| VS (Pin 6) | Positive supply | Accepts 2.7V–20V; powers internal amplifiers and reference network; bypass capacitor required at pin for transient immunity. |
| REF1 (Pin 7) | Reference voltage input | Second half of matched reference divider; identical function to REF2 - both pins must be biased within 0V to VS. |
| IN+ (Pin 8) | Positive current-sense input | Connects to bus-voltage side of shunt in high-side config; load side in low-side - completes differential sensing path. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | 1µs output hold + high AC-CMRR attenuates gate-drive transients up to 125kHz, eliminating false overcurrent triggers in motor controllers. |
| Zero-drift topology | ±0.5µV/°C max offset drift ensures <±65µV total offset shift over −40°C to +125°C, preserving calibration integrity in automotive under-hood environments. |
| Dual reference inputs | REF1/REF2 enable precise output centering (e.g., 2.5V for ±100mV shunt) without external op-amps - simplifies bidirectional current monitoring in H-bridge designs. |
| Constant input bias current | 35µA typical, invariant across −20V to +120V common-mode range - avoids shunt voltage error drift in high-voltage battery monitoring. |
| High-speed settling | 1µs to 1% ensures valid current readings within one PWM cycle at 100kHz, enabling cycle-by-cycle current limiting in digital power stages. |
Applications
| Motor Drives | Solenoids and Actuators |
|---|---|
Use Scenario: Real-time phase current sensing in 3-phase BLDC inverters for field-oriented control (FOC) and overcurrent protection. IC Role / Device Role / Timing Role: High-side bidirectional current amplifier with 1.1MHz bandwidth and 1µs settling, synchronized to PWM carrier for cycle-by-cycle limiting. Use Value: Enables precise torque regulation and fault response <10µs, reducing MOSFET failure risk during short-circuit events. | Use Scenario: Monitoring coil current in industrial pneumatic solenoids to detect stuck-armature or open-circuit faults. IC Role / Device Role / Timing Role: Low-offset, high-CMRR amplifier rejecting 48V bus noise while resolving 50mA minimum current steps. Use Value: Eliminates need for optocoupled isolation or external filtering, cutting BOM cost by $0.35/unit in valve controller modules. |
| Drone Propeller Speed Control | Injection Molding Machine |
Use Scenario: Per-motor current feedback in quadcopter ESCs to balance thrust and detect propeller strike anomalies. IC Role / Device Role / Timing Role: Bidirectional amplifier with 20V/V gain and 125kHz PWM rejection, interfacing to 3.3V MCU ADC with minimal external components. Use Value: Provides 12-bit-equivalent resolution at 100A full scale using 5mΩ shunt, enabling sub-100ms fault shutdown without firmware latency. | Use Scenario: Hydraulic pump motor current monitoring in high-noise factory environments with 600VAC variable-frequency drives nearby. IC Role / Device Role / Timing Role: High-common-mode (110V), low-drift amplifier surviving 120V transients and operating at 85°C ambient. Use Value: Maintains ±0.25% measurement accuracy over 10-year service life without recalibration, reducing maintenance downtime by 30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A2IDR | 20V/V gain, ±0.1% gain error, but only −4V to 80V common-mode range and no enhanced PWM rejection. | Limited to lower-voltage motor drives (<60V); unsuitable for 48V+ systems with fast gate-drive transients. | Select when cost sensitivity outweighs need for >80V CM range or 125kHz PWM immunity. |
| MAX40056ATA+T | 20V/V gain, ±0.2% gain error, −5V to 65V CM range, 2.5MHz bandwidth, but higher 350µV offset and no dual-reference architecture. | Better for ultra-fast overcurrent detection but lacks bidirectional flexibility and precision DC accuracy. | Prefer for high-speed protection-only roles where output centering and long-term drift matter less than raw speed. |
Compared with INA241B2IDGKR, INA240A2IDR sacrifices 30V common-mode headroom and PWM resilience for lower unit cost, while MAX40056ATA+T trades DC precision and reference flexibility for higher bandwidth - making INA241B2IDGKR optimal for high-accuracy, high-voltage bidirectional sensing where transient immunity is non-negotiable.
Availability
INA241B2IDGKR is available at Aetrix Electronics and suitable for motor drives, solenoid control, drone propulsion systems, and injection molding equipment requiring stable component supply across extended industrial temperature ranges and high-reliability production cycles.
Supply support for INA241B2IDGKR 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 delivering analog and embedded processing solutions, with over 50 years of innovation in precision signal conditioning and power management ICs.
The INA241x product line was engineered specifically for high-voltage, high-dynamic-range current sensing in switching power stages - targeting motor control, industrial automation, and battery-powered tools where accuracy under PWM noise is mission-critical.
FAQ
What is the maximum common-mode voltage the INA241B2IDGKR can withstand continuously?
The INA241B2IDGKR 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 - confirmed in Absolute Maximum Ratings section of the SBOSA30D datasheet. This enables direct connection to 48V, 60V, and 72V industrial buses without external protection.
Does the INA241B2IDGKR require external components for basic operation?
No, the INA241B2IDGKR operates with only a supply decoupling capacitor (0.1µF ceramic) on VS and proper grounding of NC (Pin 4) to GND. Unlike many current sense amplifiers, it needs no external gain-setting resistors (gain is fixed at 20V/V), no output filtering for PWM rejection, and no level-shifting circuitry - reducing layout area and validation effort for the INA241B2IDGKR.
How does the dual-reference architecture of the INA241B2IDGKR improve bidirectional current measurement?
The INA241B2IDGKR uses REF1 and REF2 to set output DC bias precisely at (REF1 + REF2)/2. When REF1 = VS and REF2 = GND, output centers at VS/2 - enabling full-scale positive and negative current representation on a single-ended ADC input. This eliminates external op-amp summing circuits and preserves 16-bit effective resolution, a key advantage of the INA241B2IDGKR over single-reference alternatives.
Can the INA241B2IDGKR be used in low-side current sensing configurations?
Yes, the INA241B2IDGKR supports low-side, high-side, and in-line configurations. For low-side use, connect IN+ to the load side of the shunt and IN− to system ground. Its −5V to 110V common-mode range accommodates ground-referenced sensing while maintaining excellent CMRR - verified in Electrical Characteristics Table 6-5 for VCM = −5V operation. This versatility is intrinsic to the INA241B2IDGKR design.
What is the thermal performance of the INA241B2IDGKR in VSSOP-8 (DGK) package?
In the DGK package, the INA241B2IDGKR has RθJA = 167.2°C/W (junction-to-ambient) and RθJB = 88.9°C/W (junction-to-board). With 2.5mA quiescent current and typical 20mW dissipation, board-level copper pour reduces junction temperature rise to <15°C above ambient - well within the −40°C to +125°C spec. Thermal metrics are measured per JEDEC JESD51 standards and apply directly to the INA241B2IDGKR.
INA241B2IDGKR 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
INA241B2IDGKR FAQ
1.How can I place an order for INA241B2IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241B2IDGKR 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 INA241B2IDGKR reliable?
The price and inventory of INA241B2IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241B2IDGKR is usually 5 days.
3.What payment methods are accepted for INA241B2IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241B2IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241B2IDGKR?
INA241B2IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241B2IDGKR 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 INA241B2IDGKR?
For technical support, including INA241B2IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241B2IDGKR requirements.
6.How does Aetrix verify that INA241B2IDGKR is sourced from the original manufacturer or authorized distributors?
All INA241B2IDGKR 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 INA241B2IDGKR meets industry standards.
7.What is the process for return or replacement of INA241B2IDGKR?
All INA241B2IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with INA241B2IDGKR, 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 INA241B2IDGKR part is unused and in its original packaging.
Return procedure for INA241B2IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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