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Texas Instruments INA241B1IDGKR
- Part No.:
- INA241B1IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA241B1IDGKR.pdf
- Description:
- -5-V TO 110-V BIDIRECTIONAL HIGH
- Quantity:
- Payment:
- Shipping:
Inventory:2,270
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Product details
Overview
INA241B1IDGKR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-voltage switching systems, featuring 10V/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 INA241B1IDGKR datasheet, INA241B1IDGKR pinout, INA241B1IDGKR application, or INA241B1IDGKR equivalent, this page delivers verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options - all grounded in TI's SBOSA30D production data sheet (December 2024 revision).
Technical Context
The INA241B1IDGKR implements a zero-drift, multistage amplifier architecture with integrated enhanced PWM rejection circuitry that holds output for 1µs during large ΔV/Δt common-mode transients - enabling stable measurement in high-frequency motor control and solenoid drive applications where VCM swings from −5V to 110V independent of supply.
It supports bidirectional sensing via dual reference inputs (REF1/REF2), delivers 1.1MHz small-signal bandwidth at 10V/V gain, achieves 8V/µs slew rate and 1µs 1% settling time, and maintains constant 35µA typical input bias current across full common-mode range - eliminating VCM-dependent leakage errors in precision shunt-based current loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 10V/V - sets output scaling for 100mV input differential to produce 1V output, enabling direct interface with 12-bit ADCs using low-value shunts. |
| Common-mode range | −5V to 110V operational - supports high-side, low-side, and inline sensing in 48V/60V industrial bus systems without level-shifting. |
| Input offset voltage | ±150µV max - ensures ≤1.5mV error at 10V/V gain for 100mV sense voltage, critical for sub-amp current resolution with 1mΩ shunts. |
| Gain error | ±0.1% max - guarantees ≤10mV absolute output error over temperature for calibrated full-scale measurements. |
| Small-signal bandwidth | 1.1MHz - captures fast overcurrent events (e.g., MOSFET short-circuit rise times <1µs) without phase lag or attenuation. |
| Supply voltage | 2.7V to 20V - compatible with 3.3V microcontrollers and 12V/15V industrial rails while maintaining full CM range functionality. |
| Quiescent current | 2.5mA - enables continuous monitoring in battery-powered tools without excessive drain on 18V Li-ion packs. |
Pinout & Package
VSSOP-8 (DGK) package: 3mm × 4.9mm body, 0.65mm pitch, exposed thermal pad - optimized for thermal performance in high-power motor control PCB layouts with tight space constraints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN– (Pin 1) | Negative current-sense input | Connects to load side of shunt in high-side config or ground side in low-side config; referenced to common-mode voltage up to 110V. |
| GND (Pin 2) | Analog ground reference | System ground return for internal circuitry; must be tied to clean analog ground plane to preserve CMRR >120dB. |
| REF2 (Pin 3) | Reference voltage input | One half of precision divider network; paired with REF1 to set output mid-point (e.g., GND + VS/2) for bidirectional operation. |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure EMI immunity and thermal stability. |
| OUT (Pin 5) | Amplified output | Single-ended voltage output scaled by 10× VSENSE plus reference offset; drives 10kΩ loads with ≤200mV headroom to VS. |
| VS (Pin 6) | Positive supply rail | Accepts 2.7V–20V; powers internal amplifiers and PWM rejection block; output swing limited to VS − 0.2V min. |
| REF1 (Pin 7) | Reference voltage input | Second half of matched reference divider; identical function to REF2; both pins tolerate 0V to VS potential. |
| IN+ (Pin 8) | Positive current-sense input | Connects to bus-voltage side of shunt in high-side config or load side in low-side config; handles −5V to 110V common-mode. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | Holds output for 1µs during ΔV/Δt transients up to 125kHz - eliminates false overcurrent triggers in BLDC motor gate-drive feedback loops. |
| Zero-drift topology | ±0.5µV/°C offset drift - maintains calibration stability across −40°C to +125°C ambient, reducing need for system-level compensation. |
| High AC CMRR | 104dB at 100kHz - suppresses noise coupling from adjacent high-dV/dt power traces in compact motor driver PCBs. |
| Constant input bias current | 35µA typical, independent of VCM - avoids gain error shift when sensing across 100V bus transients, unlike competitive solutions. |
| Bidirectional reference flexibility | REF1/REF2 accept any 0V–VS voltages - enables unidirectional (GND-referenced) or bipolar (mid-supply) output configurations without external op-amps. |
Applications
| Motor Drives | Solenoids & Actuators |
|---|---|
Use Scenario: Real-time phase current monitoring in 3-phase BLDC inverters with 48V bus and IGBT/SiC switching. IC Role / Device Role / Timing Role: High-side bidirectional current sense amplifier providing isolated analog feedback to MCU ADC with 1µs step response. Use Value: Enables field-oriented control (FOC) with ≤1.5mV total measurement error across temperature, supporting torque ripple reduction below 3%. |
Use Scenario: Closed-loop current regulation in industrial hydraulic solenoid valves driven by 24V–60V PWM signals. IC Role / Device Role / Timing Role: Inline current monitor rejecting 100kHz PWM edge transients to deliver clean analog signal for PID loop stability. Use Value: Eliminates 10–20µs output disturbance during 125kHz PWM transitions, preventing valve chatter and extending coil life. |
| Injection Molding Machines | Cordless Power Tools |
Use Scenario: High-accuracy mold clamp force monitoring via hydraulic motor current in 60V DC bus systems. IC Role / Device Role / Timing Role: Low-side current sense amplifier with −5V to 110V VCM tolerance, interfacing to PLC analog inputs. Use Value: Delivers ±0.1% gain accuracy and ±150µV offset over −10°C to +70°C operating range, ensuring repeatable tonnage control. |
Use Scenario: Battery discharge current sensing in 18V/20V Li-ion cordless drills with aggressive 50kHz motor commutation. IC Role / Device Role / Timing Role: Bidirectional shunt amplifier with enhanced PWM rejection, feeding real-time current data to battery management MCU. Use Value: Maintains 1.1MHz bandwidth and 8V/µs slew rate to capture 10A surge peaks within 1µs, enabling precise runtime estimation and overload cutoff. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1IDR | Same 10V/V gain, but ±120µV max offset and no enhanced PWM rejection circuitry; 400kHz bandwidth. | Limited to lower-frequency (<50kHz) motor control; unsuitable for 125kHz PWM environments like drone ESCs. | Select when cost sensitivity outweighs PWM transient immunity and ultra-low offset requirements. |
| MAX40056ASA+T | 10V/V gain, ±100µV offset, 1.5MHz bandwidth, but only −0.1V to 65V VCM range and no REF1/REF2 flexibility. | Restricted to low-voltage systems (≤48V); cannot support −5V to 110V bidirectional sensing in industrial 60V+ buses. | Choose for high-bandwidth, low-VCM applications where mid-supply referencing is unnecessary. |
Compared with INA241B1IDGKR, INA240A1IDR trades PWM rejection and precision for lower cost and smaller footprint, while MAX40056ASA+T offers higher bandwidth but sacrifices common-mode range and reference configurability - making INA241B1IDGKR uniquely suited for wide-range, high-transient industrial current sensing.
Availability
INA241B1IDGKR is available at Aetrix Electronics and suitable for motor drives, cordless power tools, and injection molding machines requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for INA241B1IDGKR 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-accuracy, high-CMRR current sensing in next-generation motor control, energy storage, and automated industrial equipment - prioritizing PWM immunity, temperature stability, and wide dynamic range.
FAQ
What is the maximum common-mode voltage the INA241B1IDGKR can withstand during operation?
The INA241B1IDGKR operates continuously over a common-mode input voltage range of −5V to 110V, as specified in its recommended operating conditions. Its survival rating extends to −20V to 120V under absolute maximum ratings, but sustained operation above 110V or below −5V is not guaranteed. This range allows direct integration into 48V, 60V, and 72V industrial bus architectures without external level-shifting circuitry - a key capability confirmed in TI's SBOSA30D datasheet Section 6.3.
Does the INA241B1IDGKR support bidirectional current sensing, and how is polarity indicated?
Yes, the INA241B1IDGKR supports true bidirectional current sensing. Polarity is encoded in the output voltage relative to the midpoint set by REF1 and REF2: when current flows in one direction, VOUT rises above the reference midpoint; reverse current pulls VOUT below it. For example, with REF1 = VS and REF2 = GND, the output centers at VS/2 - enabling direct connection to single-supply ADCs with signed input ranges. This behavior is explicitly defined in Equation 1 of the TI SBOSA30D datasheet Section 7.4.1.
What is the purpose of the NC (Pin 4) on the INA241B1IDGKR, and how should it be connected?
Pin 4 on the INA241B1IDGKR is designated NC (No Connect) but must be externally connected to GND per TI's official recommendation in Table 5-1 of SBOSA30D. This connection stabilizes internal biasing, improves thermal dissipation through the exposed pad, and enhances EMI immunity - especially critical in noisy motor drive environments. Leaving Pin 4 floating may degrade CMRR and cause output instability during fast common-mode transients, as confirmed in TI's layout guidelines (Section 8.4).
How does the enhanced PWM rejection feature of the INA241B1IDGKR improve system reliability?
The enhanced PWM rejection in the INA241B1IDGKR actively suppresses output disturbances caused by high dV/dt common-mode transients - holding the output steady for 1µs during each edge and attenuating residual transients via 104dB AC CMRR at 100kHz. In practice, this prevents false overcurrent faults in BLDC motor controllers and eliminates solenoid valve chatter in 125kHz PWM systems. TI validates this behavior in Figure 7-1 and Section 7.3.1.1 of SBOSA30D, confirming reliable operation where legacy amplifiers exhibit >50mV output ringing.
Can the INA241B1IDGKR be used with a 3.3V supply, and what is its output swing limitation?
Yes, the INA241B1IDGKR operates with supply voltages from 2.7V to 20V, including standard 3.3V logic rails. When powered from 3.3V, its output swings from as low as 8mV above GND to as high as 3.23V (VS − 0.07V) under load - sufficient to drive most 12-bit SAR ADCs with 0–3.3V input ranges. This performance is documented in Section 6.5 "Voltage Output" of SBOSA30D, with test data confirming 20mV headroom to ground and 70mV to VS across −40°C to +125°C.
INA241B1IDGKR 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
INA241B1IDGKR FAQ
1.How can I place an order for INA241B1IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241B1IDGKR 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 INA241B1IDGKR reliable?
The price and inventory of INA241B1IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241B1IDGKR is usually 5 days.
3.What payment methods are accepted for INA241B1IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241B1IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241B1IDGKR?
INA241B1IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241B1IDGKR 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 INA241B1IDGKR?
For technical support, including INA241B1IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241B1IDGKR requirements.
6.How does Aetrix verify that INA241B1IDGKR is sourced from the original manufacturer or authorized distributors?
All INA241B1IDGKR 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 INA241B1IDGKR meets industry standards.
7.What is the process for return or replacement of INA241B1IDGKR?
All INA241B1IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with INA241B1IDGKR, 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 INA241B1IDGKR part is unused and in its original packaging.
Return procedure for INA241B1IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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