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Texas Instruments INA241B5IDGKR
- Part No.:
- INA241B5IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA241B5IDGKR.pdf
- Description:
- -5-V TO 110-V BIDIRECTIONAL HIGH
- Quantity:
- Payment:
- Shipping:
Inventory:2,493
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Product details
Overview
INA241B5IDGKR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-voltage switching systems, featuring 200V/V fixed gain, −5V to 110V operational common-mode range, ±0.1% max gain error, ±150µV max input offset voltage, and 1.1MHz small-signal bandwidth. It enables accurate inline motor-phase current monitoring in industrial inverters.
For engineers reviewing the INA241B5IDGKR datasheet, INA241B5IDGKR pinout, INA241B5IDGKR application, or INA241B5IDGKR equivalent, this page delivers verified specifications, package mapping, real-world use cases, and validated alternative options for high-side/low-side current sensing in PWM-rich environments.
Technical Context
The INA241B5IDGKR employs a zero-drift, multistage amplifier architecture with integrated enhanced PWM rejection circuitry that holds output for 1µs during fast common-mode transients (up to 125kHz), then relies on 104dB AC-CMRR at 100kHz and 89dB at 1MHz for subsequent attenuation. Its input bias current remains constant at 35µA (typ) across −20V to 120V survival common-mode range.
It supports bidirectional operation via dual reference pins (REF1/REF2), enabling mid-supply output offset for symmetric current measurement, and operates from 2.7V to 20V supply while drawing only 2.5mA quiescent current - critical for thermally constrained motor control PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200V/V - sets full-scale output to 4V for 20mV shunt drop, enabling high-resolution low-current sensing with minimal power loss. |
| Common-mode range | −5V to 110V - supports direct high-side sensing on 48V/60V bus systems without level-shifting or isolation. |
| Gain error (max) | ±0.1% - ensures <±2mV absolute error at 4V output, critical for closed-loop torque accuracy in servo drives. |
| Input offset voltage (max) | ±150µV - limits worst-case current measurement error to ±0.75mA on 20mΩ shunt, preserving sub-amp resolution. |
| Small-signal bandwidth | 1.1MHz - captures fast overcurrent events within ≤1µs settling time to 1%, enabling cycle-by-cycle protection. |
| Supply voltage | 2.7V to 20V - compatible with 3.3V logic interfaces and 12V/15V system rails without external regulators. |
| Quiescent current | 2.5mA - enables integration into power-constrained battery-operated tools without thermal derating. |
Pinout & Package
VSSOP-8 (DGK) package: 3mm × 4.9mm body, 0.65mm pitch, exposed thermal pad (not electrically connected), RoHS-compliant, surface-mount.
| 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; withstands −20V to 120V transient. |
| GND (Pin 2) | Analog ground reference | Return path for internal circuitry; must be tied to clean system ground plane to maintain 166dB DC-CMRR. |
| 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 mode). |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure ESD robustness and noise immunity. |
| OUT (Pin 5) | Amplified output | Delivers 200×(IN+ − IN−) + (REF1 + REF2)/2; swings to within 20mV of GND and 200mV below VS under 10kΩ load. |
| VS (Pin 6) | Positive supply rail | Accepts 2.7V–20V; powers internal amplifiers and reference network; decoupling capacitor required at pin. |
| REF1 (Pin 7) | Reference voltage input | Matches REF2 electrically; forms precision midpoint reference with ±0.005% divider accuracy for stable zero-current baseline. |
| 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; shares same CM tolerance as IN–. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | Holds output for 1µs during fast ΔV/Δt transients up to 125kHz, eliminating false overcurrent triggers in BLDC motor gate-drive feedback loops. |
| Zero-drift topology | Maintains ±0.5µV/°C offset drift over −40°C to 125°C, ensuring stable calibration across automotive and industrial temperature ranges. |
| Constant input bias current | 35µA (typ) independent of common-mode voltage - avoids gain error shift when sensing across wide VCM swings in solenoid drivers. |
| High AC-CMRR | 104dB at 100kHz - suppresses noise coupling from adjacent high-dI/dt power traces in compact motor-control PCB layouts. |
| Bidirectional reference flexibility | REF1/REF2 allow programmable output offset from GND to VS, enabling unidirectional (0–4V) or bidirectional (±2V) current reporting without external op-amps. |
Applications
| Motor Drives | Solenoids and Actuators |
|---|---|
|
Use Scenario: Real-time phase current measurement in 3-phase inverter legs for field-oriented control (FOC) of industrial servo motors. IC Role / Device Role / Timing Role: High-side current sense amplifier providing isolated, low-latency analog feedback to MCU ADC with <1µs step response. Use Value: Enables precise torque regulation and overcurrent shutdown within one PWM cycle using 200V/V gain and 1.1MHz bandwidth. |
Use Scenario: Monitoring coil current in high-speed pneumatic solenoid valves used in injection molding machines. IC Role / Device Role / Timing Role: Bidirectional current monitor capturing turn-on surge and turn-off flyback energy in 24V/48V solenoid circuits. Use Value: Delivers ±150µV offset stability across −40°C to 125°C, ensuring consistent valve timing and lifetime prediction. |
| Cordless Power Tools | Drone Propeller Speed Control |
|
Use Scenario: Battery discharge current sensing in 18V/20V brushless drill controllers with aggressive thermal constraints. IC Role / Device Role / Timing Role: Low-power (2.5mA IQ), high-accuracy current sensor interfacing directly to 3.3V MCU ADC. Use Value: 200V/V gain maximizes dynamic range on small shunts, reducing I²R losses while maintaining <1% gain error over temperature. |
Use Scenario: Individual ESC current monitoring in multirotor drones to balance motor load and prevent propeller stall. IC Role / Device Role / Timing Role: Fast-settling (1µs to 1%) current amplifier feeding closed-loop speed controller with minimal phase lag. Use Value: Enhanced PWM rejection eliminates noise-induced jitter during rapid throttle changes, improving flight stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A5IDR | Same 200V/V gain, but ±0.02% max gain error and ±10µV max offset - tighter initial accuracy but no enhanced PWM rejection circuitry. | Lacks 1µs hold-time feature; susceptible to output disturbance during >50kHz common-mode transients in high-frequency inverters. | Select when ultimate DC accuracy is prioritized over PWM noise immunity, e.g., lab-grade test equipment. |
| MAX40056ATA+T | 200V/V gain, −5V to 65V common-mode range, 1.5MHz bandwidth, but only 85dB AC-CMRR at 100kHz and no dedicated PWM rejection. | Not rated for 110V bus systems; requires external filtering for clean output in 48V+ motor drives with fast SiC switching. | Choose for cost-sensitive, lower-voltage (<60V) applications where layout-level noise mitigation is feasible. |
Compared with INA241B5IDGKR, INA240A5IDR trades PWM robustness for higher DC precision, while MAX40056ATA+T offers wider bandwidth but sacrifices common-mode range and transient immunity - making INA241B5IDGKR uniquely suited for 48V–110V industrial motor control with SiC/GaN switching.
Availability
INA241B5IDGKR is available at Aetrix Electronics and suitable for motor drives, cordless power tools, drone ESCs, and solenoid control systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for INA241B5IDGKR 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 product line was designed specifically for high-voltage, high-speed bidirectional current sensing in PWM-driven power conversion systems - targeting motor control, battery management, and industrial actuation.
FAQ
What is the maximum common-mode voltage the INA241B5IDGKR can survive?
The INA241B5IDGKR has a survival common-mode voltage rating of −20V to 120V, meaning it withstands transient overvoltage events beyond its operational range (−5V to 110V) without damage. This margin protects against inductive kickback in solenoid and motor drive applications. The INA241B5IDGKR maintains functional integrity within its specified operating range even after exposure to these survival-level transients.
Does the INA241B5IDGKR require external components for basic operation?
No, the INA241B5IDGKR operates with only two external components: a 0.1µF ceramic decoupling capacitor on the VS pin and a grounded NC pin (Pin 4). Unlike many current sense amplifiers, it needs no external gain-setting resistors (gain is fixed at 200V/V), no output filtering for PWM rejection, and no additional references for bidirectional operation - simplifying layout and reducing BOM count. The INA241B5IDGKR integrates all core functionality internally.
How does the enhanced PWM rejection in the INA241B5IDGKR improve motor control reliability?
The INA241B5IDGKR's enhanced PWM rejection holds its output steady for 1µs during fast common-mode transients (e.g., SiC switch turn-on), preventing false overcurrent signals that could trigger unnecessary shutdowns. After the hold period, its 104dB AC-CMRR at 100kHz attenuates residual noise. This dual-stage mechanism ensures clean, deterministic current feedback in high-frequency motor drives - directly improving FOC loop stability and system uptime. The INA241B5IDGKR achieves this without software compensation or external filters.
Can the INA241B5IDGKR be used for unidirectional current sensing?
Yes, the INA241B5IDGKR supports unidirectional operation by connecting both REF1 and REF2 to GND (for 0–4V output) or to VS (for 0–4V inverted output). This eliminates the need for external level-shifting circuitry. Its ±150µV max offset and ±0.1% gain error ensure high accuracy even at low current levels - ideal for battery discharge monitoring in cordless tools. The INA241B5IDGKR retains full performance in either configuration without recalibration.
What package type is the INA241B5IDGKR supplied in, and why is it suitable for motor control designs?
The INA241B5IDGKR uses the VSSOP-8 (DGK) package: 3mm × 4.9mm body with 0.65mm pitch and an exposed thermal pad. Its compact size saves PCB area in space-constrained motor driver modules, while the thermal pad improves heat dissipation under continuous 2.5mA operation. The DGK footprint is widely supported in industrial design libraries and offers better high-frequency noise immunity than SOIC-8 due to shorter lead inductance - critical for clean current sensing near power stages. The INA241B5IDGKR's package aligns with IPC-7351 standards for automated assembly.
INA241B5IDGKR 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
INA241B5IDGKR FAQ
1.How can I place an order for INA241B5IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241B5IDGKR 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 INA241B5IDGKR reliable?
The price and inventory of INA241B5IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241B5IDGKR is usually 5 days.
3.What payment methods are accepted for INA241B5IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241B5IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241B5IDGKR?
INA241B5IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241B5IDGKR 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 INA241B5IDGKR?
For technical support, including INA241B5IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241B5IDGKR requirements.
6.How does Aetrix verify that INA241B5IDGKR is sourced from the original manufacturer or authorized distributors?
All INA241B5IDGKR 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 INA241B5IDGKR meets industry standards.
7.What is the process for return or replacement of INA241B5IDGKR?
All INA241B5IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with INA241B5IDGKR, 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 INA241B5IDGKR part is unused and in its original packaging.
Return procedure for INA241B5IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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