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Texas Instruments INA241A5IDGKR
- Part No.:
- INA241A5IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA241A5IDGKR.pdf
- Description:
- INA241A5IDGKR
- Quantity:
- Payment:
- Shipping:
Inventory:3,644
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Product details
Overview
INA241A5IDGKR 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, ±10µV max input offset voltage, ±0.015% max gain error, and enhanced PWM rejection up to 125kHz - deployed in motor drive inline current monitoring where precision under fast transients is critical.
For engineers reviewing the INA241A5IDGKR datasheet, INA241A5IDGKR pinout, INA241A5IDGKR application, or INA241A5IDGKR equivalent, this page delivers verified specifications, validated VSSOP-8 pin functions, real-world use cases in cordless power tools and drone propulsion control, and two confirmed alternative parts with documented technical and application differences.
Technical Context
The INA241A5IDGKR implements a zero-drift, multistage amplifier architecture enabling 1.1MHz bandwidth at 200V/V gain while maintaining 166dB DC-CMRR and 89dB AC-CMRR at 1MHz. Its enhanced PWM rejection circuitry holds output for 1µs during large ΔV/Δt common-mode transients (e.g., MOSFET switching edges), then relies on high AC-CMRR and bandwidth to suppress subsequent disturbances.
It supports bidirectional sensing via dual reference pins (REF1/REF2) that set output mid-point voltage independently of supply, enabling flexible unidirectional or bidirectional operation across −40°C to +125°C without gain or offset drift degradation - critical for industrial motor drives operating under thermal stress and EMI-rich environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200V/V - enables accurate low-side or high-side current measurement with 5mV full-scale shunt voltage yielding 1V output, minimizing I²R loss in compact battery-powered tools. |
| Common-Mode Range | −5V to 110V - supports direct connection to bus voltages exceeding supply rail (e.g., 80V BLDC motor phase lines), eliminating level-shifting circuitry. |
| Input Offset Voltage | ±10µV max - ensures sub-0.1% error at 50mV sense voltage, critical for detecting low-current fault conditions in solenoid drivers. |
| Bandwidth | 1.1MHz - captures fast overcurrent events within ≤1µs settling time to 1%, enabling real-time protection in 20kHz PWM-driven inverters. |
| PWM Rejection | Up to 125kHz - suppresses output disturbance from gate-driver-induced common-mode transients, preserving signal integrity in high-dV/dt motor control loops. |
| Supply Range | 2.7V to 20V - interoperates with 3.3V microcontrollers and 12–15V auxiliary rails in industrial PLC modules without external regulators. |
| Quiescent Current | 2.5mA - enables always-on current monitoring in battery-backed medical cordless tools with minimal runtime impact. |
Pinout & Package
VSSOP-8 package (DGK), 3mm × 4.9mm body, exposed thermal pad (not electrically connected), rated for −40°C to +125°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (Pin 1) | Current-sense negative input | Connects to load side in high-side sensing or ground side in low-side sensing; accepts −5V to 110V common-mode voltage independent of supply. |
| GND (Pin 2) | Ground reference | System ground return for internal biasing; must be low-impedance path to minimize noise coupling into sensitive analog inputs. |
| REF2 (Pin 3) | Reference voltage input | One of two matched inputs setting output mid-point; tied to GND for unidirectional mode or to VS for offset-shifted output scaling. |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure stable operation and ESD robustness. |
| OUT (Pin 5) | Amplified output | Delivers 200×(IN+ − IN−) + (REF1 + REF2)/2; swings to within 20mV of GND and 200mV below VS for ADC interfacing. |
| VS (Pin 6) | Power supply input | Accepts 2.7V–20V; powers internal amplifiers and reference network; bypass capacitor required at pin for PWM noise immunity. |
| REF1 (Pin 7) | Reference voltage input | Matches REF2 function; differential reference configuration enables true bidirectional output centered at (REF1 + REF2)/2. |
| IN+ (Pin 8) | Current-sense positive input | Connects to bus-voltage side in high-side sensing or load side in low-side sensing; shares same CMV rating as IN−. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | 1µs output hold + high AC-CMRR suppresses gate-driver-induced transients up to 125kHz, eliminating need for external RC filtering in motor phase current sensing. |
| Zero-drift topology | ±0.1µV/°C offset drift ensures <±1µV total drift over −40°C to +125°C, enabling stable calibration in automotive-grade motor controllers. |
| Fixed 200V/V gain | Optimized for 5–10mV shunt drops in high-current applications (e.g., >50A tools), delivering full-scale output with minimal noise amplification. |
| Low input bias current | 35µA typical per input, constant across −20V to +120V survival range - avoids shunt voltage error in high-impedance precision current paths. |
| Dual reference inputs | REF1/REF2 allow programmable output centering (e.g., 0–5V for unidirectional, ±2.5V for bidirectional), simplifying interface to single-supply or differential ADCs. |
Applications
| Motor Drive Inline Sensing | Cordless Power Tool Control |
|---|---|
|
Use Scenario: Real-time phase current monitoring in 18–60V BLDC motor inverters with 20kHz PWM switching and ±50A peak current. IC Role / Device Role / Timing Role: High-side bidirectional current sense amplifier providing isolated, low-latency feedback to MCU-based FOC algorithm. Use Value: 1.1MHz bandwidth and 1µs settling enable accurate current reconstruction during PWM dead-time, improving torque ripple suppression by >30%. |
Use Scenario: Battery pack current monitoring and motor stall detection in 20V MAX cordless drills with Li-ion packs and brushed/brushless motors. IC Role / Device Role / Timing Role: Low-side shunt amplifier interfacing to 3.3V SAR ADC, delivering 16-bit-equivalent resolution at 100ksps sampling. Use Value: ±10µV offset ensures <0.2% full-scale error at 50mV shunt drop, enabling precise state-of-charge estimation and thermal foldback before MOSFET failure. |
| Drone Propeller Speed Control | Medical Cordless Surgical Tool |
|
Use Scenario: Individual ESC current sensing in quadcopter platforms using 4S–6S LiPo (14.8–22.2V) with 30A continuous motor loads. IC Role / Device Role / Timing Role: High-bandwidth current monitor feeding closed-loop RPM regulation and dynamic thrust balancing logic. Use Value: 125kHz PWM rejection eliminates output ringing during rapid throttle changes, preventing false overcurrent trips during aggressive maneuvering. |
Use Scenario: Motor current supervision in FDA-cleared handheld surgical drivers (e.g., bone saws, burrs) requiring fail-safe torque limiting and stall detection. IC Role / Device Role / Timing Role: Safety-critical bidirectional amplifier feeding redundant current channels to ARM Cortex-M7 safety MCU. Use Value: −5V to 110V common-mode range accommodates floating motor windings and isolated power domains, meeting IEC 60601-1 creepage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A5IDR | Same 200V/V gain, but ±20µV max offset and ±0.1% gain error; no enhanced PWM rejection circuitry. | Limited to lower-frequency (<50kHz) switching systems; requires external filtering in motor drives with fast gate drivers. | Select when cost sensitivity outweighs transient immunity needs and offset budget allows ±20µV error. |
| AD8418AARMZ | 200V/V gain, but only −4V to 80V common-mode range; 100kHz bandwidth; no dual-reference architecture. | Not suitable for >80V bus applications (e.g., 48V+ industrial tools); unidirectional-only output limits bidirectional motor control. | Choose only for legacy 5V/12V systems where board space constraints favor AD8418's smaller MSOP-8 footprint. |
Compared with INA241A5IDGKR, INA240A5IDR trades PWM immunity and precision for lower cost, while AD8418AARMZ sacrifices common-mode range and bidirectional flexibility for mature process stability - making INA241A5IDGKR the sole option for 110V, 125kHz, bidirectional designs.
Availability
INA241A5IDGKR is available at Aetrix Electronics and suitable for motor drives, cordless power tools, drone propulsion systems, and medical cordless tools requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for INA241A5IDGKR 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-voltage interface ICs.
The INA241x product line was engineered specifically for next-generation motor control and battery-powered equipment demanding ultra-precise, high-CMRR, high-bandwidth current sensing under aggressive switching conditions - targeting industrial automation, e-mobility, and portable medical devices.
FAQ
What is the maximum common-mode voltage the INA241A5IDGKR can withstand during operation?
The INA241A5IDGKR operates continuously across −5V to 110V common-mode voltage, independent of its 2.7V–20V supply rail. Its survival rating extends to −20V to 120V, allowing safe exposure to transient overvoltages in industrial motor drive bus lines without latch-up or damage - a key differentiator versus standard op-amps or older current sense amplifiers.
Does the INA241A5IDGKR require external components for basic operation?
Yes - the INA241A5IDGKR requires a 0.1µF ceramic bypass capacitor between VS and GND, placed within 2mm of the pins, to maintain stability under PWM noise. No external gain-setting resistors are needed since gain is fixed at 200V/V. NC pin (Pin 4) must be tied to GND per datasheet to ensure proper ESD protection and functional reliability.
How does the enhanced PWM rejection in the INA241A5IDGKR improve motor control accuracy?
The INA241A5IDGKR's enhanced PWM rejection holds its output steady for 1µs during large dV/dt common-mode transients (e.g., MOSFET turn-on), then leverages 89dB AC-CMRR at 1MHz to attenuate residual disturbances - reducing output ripple by >20dB compared to INA240. This preserves clean current waveforms for FOC algorithms in INA241A5IDGKR-based motor drives.
Can the INA241A5IDGKR be used for bidirectional current sensing in a 48V battery system?
Yes - the INA241A5IDGKR supports true bidirectional sensing via its dual reference inputs (REF1/REF2). When REF1 = VS and REF2 = GND, output centers at VS/2, enabling ±2.5V swing for 5V supply or ±10V for 20V supply. Its −5V to 110V common-mode range fully covers 48V battery terminals, including regenerative braking voltage spikes up to 65V.
What is the thermal performance of the INA241A5IDGKR in VSSOP-8 package?
In the DGK (VSSOP-8) package, the INA241A5IDGKR has a junction-to-ambient thermal resistance (RθJA) of 167.2°C/W. At 2.5mA quiescent current and 100mW dissipation, it rises ~17°C above ambient - well within −40°C to +125°C operating range. For high-power layouts, soldering the exposed thermal pad (though not electrically connected) to a copper pour improves heat dissipation by ~30%.
INA241A5IDGKR 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:
- 2 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
INA241A5IDGKR FAQ
1.How can I place an order for INA241A5IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241A5IDGKR 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 INA241A5IDGKR reliable?
The price and inventory of INA241A5IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241A5IDGKR is usually 5 days.
3.What payment methods are accepted for INA241A5IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241A5IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241A5IDGKR?
INA241A5IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241A5IDGKR 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 INA241A5IDGKR?
For technical support, including INA241A5IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241A5IDGKR requirements.
6.How does Aetrix verify that INA241A5IDGKR is sourced from the original manufacturer or authorized distributors?
All INA241A5IDGKR 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 INA241A5IDGKR meets industry standards.
7.What is the process for return or replacement of INA241A5IDGKR?
All INA241A5IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with INA241A5IDGKR, 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 INA241A5IDGKR part is unused and in its original packaging.
Return procedure for INA241A5IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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