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Texas Instruments INA241B5IDR
- Part No.:
- INA241B5IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA241B5IDR.pdf
- Description:
- -5-V TO 110-V BIDIRECTIONAL HIGH
- Quantity:
- Payment:
- Shipping:
Inventory:2,446
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Product details
Overview
INA241B5IDR 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 enhanced PWM rejection up to 125kHz - deployed in motor drives and cordless power tools for accurate inline current monitoring under fast transients.
For engineers reviewing the INA241B5IDR datasheet, INA241B5IDR pinout, INA241B5IDR application, or INA241B5IDR equivalent, this page delivers verified specifications, validated pin functions across SOT23-8/VSSOP-8/SOIC-8 packages, real-world use cases in bidirectional high-side sensing, and two confirmed alternative parts with documented technical and application differences.
Technical Context
The INA241B5IDR implements a zero-drift, multistage amplifier architecture enabling 1.1MHz bandwidth and 8V/µs slew rate at all gains - critical for overcurrent detection in PWM-driven motor control. Its enhanced PWM rejection circuitry holds output for 1µs during large ΔV/Δt common-mode transients (e.g., gate-driver switching), then relies on 104dB AC-CMRR at 100kHz to suppress residual disturbance.
It supports bidirectional sensing via dual reference inputs (REF1/REF2), allowing configurable output centering from GND to VS; operates from 2.7V–20V supply with 2.5mA quiescent current; and maintains stable input bias current (35µA typ) across −20V to 120V survival common-mode range - independent of supply voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200V/V - enables high-resolution measurement of low shunt voltages (e.g., 5mV full-scale → 1V output), reducing power loss in low-RSHUNT designs. |
| Common-mode range | −5V to 110V operational - supports direct high-side sensing in 48V/60V bus systems without level-shifting, even when VCM exceeds supply voltage. |
| Gain error | ±0.1% max - ensures <±2mV absolute error at 2V output, critical for closed-loop current regulation accuracy in motor phase control. |
| Input offset voltage | ±150µV max - limits worst-case measurement error to ±0.75mV at 200× gain, sufficient for ±1% full-scale accuracy down to 75mV VSENSE. |
| Small-signal bandwidth | 1.1MHz - captures fast current transients (e.g., short-circuit rise times <300ns) without phase lag in protection circuits. |
| PWM rejection | Up to 125kHz - suppresses output disturbance from gate-driver switching edges, enabling clean current feedback during active PWM periods. |
| Supply voltage | 2.7V to 20V - compatible with 3.3V, 5V, and 12V system rails while maintaining full common-mode performance. |
Pinout & Package
INA241B5IDR is available in SOIC-8 (D), VSSOP-8 (DGK), and SOT23-8 (DDF) packages - all 8-pin surface-mount formats with identical pinout. The D package measures 4.9mm × 6mm; DGK is 3mm × 4.9mm; DDF is 2.9mm × 2.8mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN– (Pin 1) | Current-sense amplifier negative input | Connect to load side in high-side sensing or ground side in low-side sensing; forms differential pair with IN+ for VSENSE measurement. |
| GND (Pin 2) | Ground reference | System ground return for internal circuitry and output stage; must be low-impedance path to minimize noise coupling. |
| 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 bidirectional centering. |
| 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 voltage | Single-ended output proportional to (IN+ − IN−) × 200 + (REF1 + REF2)/2; swings within 20mV of GND and 200mV below VS. |
| VS (Pin 6) | Power supply input | Accepts 2.7V–20V; powers internal amplifier and reference network; bypass capacitor required at pin for high-frequency stability. |
| REF1 (Pin 7) | Reference voltage input | Second matched reference input; used with REF2 to configure output offset - e.g., REF1=VS, REF2=GND → VOUT = 200·VSENSE + VS/2. |
| IN+ (Pin 8) | Current-sense amplifier positive input | Connect to bus-voltage side in high-side sensing or load side in low-side sensing; differential with IN– defines sensed current polarity. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | 1µs output hold + 104dB AC-CMRR at 100kHz - eliminates false overcurrent triggers during MOSFET/IGBT switching in motor inverters. |
| Zero-drift topology | ±0.5µV/°C max offset drift - maintains calibration integrity over −40°C to 125°C ambient, avoiding recalibration in industrial enclosures. |
| Constant input bias current | 35µA typical, invariant across −20V to 120V common-mode - prevents gain error shift in high-impedance shunt networks or precision battery monitoring. |
| Reference-input flexibility | Dual REF1/REF2 pins enable programmable output centering - supports unidirectional (0–VS) or bidirectional (±VS/2) current measurement without external op-amps. |
| High-speed transient response | 1µs settling to 1% - captures sub-microsecond current spikes in drone ESCs or solenoid actuation, enabling real-time fault detection. |
Applications
| Motor Drives | Solenoids & Actuators |
|---|---|
Use Scenario: Real-time phase current sensing in 3-phase BLDC motor controllers using high-side shunts on 48V bus. IC Role / Device Role / Timing Role: Bidirectional current amplifier measuring VSENSE across 1mΩ shunt, rejecting 20kHz–100kHz PWM noise from gate drivers. Use Value: Enables precise field-oriented control (FOC) with <±0.5% current loop accuracy, reducing torque ripple and thermal stress on IGBTs. |
Use Scenario: Monitoring coil current in industrial hydraulic solenoid valves during rapid on/off cycling. IC Role / Device Role / Timing Role: High-bandwidth current monitor capturing 500ns turn-on transients and detecting open-circuit faults before mechanical damage. Use Value: Improves valve lifetime by triggering immediate shutdown on current anomalies, eliminating reliance on slower microcontroller ADC sampling. |
| Cordless Power Tools | Drone Propeller Speed Control |
Use Scenario: Battery discharge current monitoring in 18V/20V cordless drills with brushless motors and integrated MCU. IC Role / Device Role / Timing Role: Low-offset, high-CMRR amplifier interfacing directly to MCU's 12-bit ADC, operating from same 3.3V rail. Use Value: Extends runtime estimation accuracy to ±2% by eliminating offset drift-induced SOC errors across temperature swings during heavy load. |
Use Scenario: Individual ESC current feedback in quadcopter flight controllers for adaptive PID tuning per motor. IC Role / Device Role / Timing Role: Fast-settling (1µs) current sensor feeding 10kHz control loop, rejecting EMI from adjacent ESC switching. Use Value: Reduces propeller speed variance to <±0.3% under gust loads, improving flight stability and battery efficiency via dynamic current limiting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A5IDR | Same 200V/V gain, but ±0.2% gain error (vs. ±0.1%), ±50µV offset (vs. ±150µV), and no enhanced PWM rejection circuitry. | Lacks 125kHz PWM immunity - requires external filtering in high-dV/dt motor drives; suitable only for low-frequency (<10kHz) DC loads. | Select if cost sensitivity outweighs PWM noise rejection needs and offset drift is managed via calibration. |
| MAX40056ASA+ | 200V/V gain, ±0.3% gain error, ±200µV offset, 1.5MHz bandwidth, but only −0.2V to 65V common-mode range. | Cannot support >65V bus systems (e.g., 72V e-bikes); lacks dual-reference flexibility - output centered at VS/2 only. | Choose only for 24V/48V systems where wider bandwidth offsets limited common-mode range, and fixed-center output suffices. |
Compared with INA241B5IDR, INA240A5IDR trades PWM robustness for lower offset, while MAX40056ASA+ sacrifices common-mode headroom for higher bandwidth - making INA241B5IDR uniquely balanced for 48–110V bidirectional PWM environments requiring both precision and noise immunity.
Availability
INA241B5IDR is available at Aetrix Electronics and suitable for motor drives, cordless power tools, and drone ESCs requiring stable component supply, long-term production continuity, and guaranteed traceability for industrial and consumer OEM programs.
Supply support for INA241B5IDR 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 power management ICs.
The INA241x family was designed specifically for high-voltage, high-noise industrial and automotive current sensing - emphasizing PWM rejection, wide common-mode operation, and zero-drift stability across extended temperature ranges.
FAQ
What is the maximum common-mode voltage the INA241B5IDR can withstand continuously?
The INA241B5IDR operates continuously over −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 handling load-dump events in 48V vehicle systems or industrial bus surges. This rating applies across all supported packages and temperatures.
Does the INA241B5IDR require external components for basic operation?
Yes - the INA241B5IDR requires a 0.1µF ceramic bypass capacitor between VS and GND, placed within 2mm of the pin. For stable operation with capacitive loads >100pF, a 10Ω series resistor at the OUT pin is recommended. No external gain-setting resistors are needed since gain is fixed at 200V/V. NC pin must be tied to GND.
How does the enhanced PWM rejection in the INA241B5IDR differ from standard CMRR?
Standard DC/AC CMRR attenuates steady-state or sinusoidal common-mode interference. The INA241B5IDR's enhanced PWM rejection adds a 1µs output hold function triggered by fast dV/dt edges (>10V/ns), followed by high AC-CMRR (104dB @ 100kHz) - suppressing both step-induced ringing and harmonic content from PWM switching, unlike conventional amplifiers that only address amplitude-based rejection.
Can the INA241B5IDR measure current in both directions with a single supply?
Yes - the INA241B5IDR supports true bidirectional sensing with a single 2.7V–20V supply by configuring REF1 and REF2. Setting REF1 = VS and REF2 = GND centers the output at VS/2, so positive VSENSE raises output above mid-supply and negative VSENSE lowers it - enabling full-scale measurement of charge/discharge currents in battery management without dual supplies.
What package options are available for the INA241B5IDR, and are their pinouts identical?
The INA241B5IDR is offered in SOIC-8 (D), VSSOP-8 (DGK), and SOT23-8 (DDF) packages - all share identical 8-pin functionality and pinout per TI's datasheet SBOSA30D. Mechanical dimensions differ (D: 4.9×6mm; DGK: 3×4.9mm; DDF: 2.9×2.8mm), but layout footprints and signal routing are interchangeable across variants, simplifying design reuse.
INA241B5IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
INA241B5IDR FAQ
1.How can I place an order for INA241B5IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241B5IDR 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 INA241B5IDR reliable?
The price and inventory of INA241B5IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241B5IDR is usually 5 days.
3.What payment methods are accepted for INA241B5IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241B5IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241B5IDR?
INA241B5IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241B5IDR 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 INA241B5IDR?
For technical support, including INA241B5IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241B5IDR requirements.
6.How does Aetrix verify that INA241B5IDR is sourced from the original manufacturer or authorized distributors?
All INA241B5IDR 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 INA241B5IDR meets industry standards.
7.What is the process for return or replacement of INA241B5IDR?
All INA241B5IDR units undergo pre-shipment inspection (PSI). If there is an issue with INA241B5IDR, 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 INA241B5IDR part is unused and in its original packaging.
Return procedure for INA241B5IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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