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Texas Instruments INA181A3IDBVT
- Part No.:
- INA181A3IDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
INA181A3IDBVT.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:6,182
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Product details
Overview
INA181A3IDBVT from Texas Instruments is a single-channel, bidirectional current-sense amplifier optimized for high-accuracy, low-power current monitoring in both high-side and low-side configurations. It features 100 V/V fixed gain, –0.2 V to +26 V input common-mode range, ±500 µV max offset at 12 V VCM, 150 kHz bandwidth, and 2 V/µs slew rate - enabling precise motor control and battery management in 2.7–5.5 V systems.
For engineers reviewing the INA181A3IDBVT datasheet, INA181A3IDBVT pinout, INA181A3IDBVT application, or INA181A3IDBVT equivalent, this page delivers verified specifications, package-validated pin functions, real-world use cases in power conversion and embedded sensing, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The INA181A3IDBVT employs a precision current-shunt monitor architecture with integrated matched resistor gain network (100 V/V), enabling accurate RTI voltage measurement across sense resistors independent of supply voltage. Its proprietary topology supports operation with common-mode voltages exceeding VS - critical for high-side sensing in 24-V bus systems.
It delivers rail-to-rail output swing (within 30 mV of VS and 5 mV of GND), 1-µV/°C max offset drift, and ±1% max gain error over –40°C to +125°C - making it suitable for closed-loop current feedback in safety-aware industrial drives and battery protection circuits where signal fidelity and thermal stability are non-negotiable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100 V/V - fixed internal ratio; eliminates external resistor matching errors and reduces temperature-induced gain drift in shunt-based current measurement. |
| Common-mode range | –0.2 V to +26 V - enables direct connection to 24-V bus rails without level-shifting, supporting both high-side and low-side sensing topologies. |
| Offset voltage | ±500 µV max at VCM = 12 V - ensures <100 µA error in 0.1-Ω shunt at 1 A load, critical for low-current accuracy in battery fuel gauging. |
| Bandwidth | 150 kHz - sufficient to capture fast transients in BLDC motor phase current or solar inverter DC-link ripple. |
| Slew rate | 2 V/µs - maintains fidelity on step changes in sensed current up to ~10 A/µs in 0.01-Ω shunts, avoiding distortion in fault detection. |
| Supply voltage | 2.7 V to 5.5 V - compatible with standard microcontroller I/O domains and low-voltage logic, reducing need for auxiliary LDOs. |
| Quiescent current | 260 µA max - enables always-on current monitoring in energy-sensitive applications like portable medical devices or IoT edge nodes. |
Pinout & Package
The INA181A3IDBVT is packaged in a 6-pin SOT-23 (DBV) footprint measuring 2.90 mm × 2.80 mm, optimized for space-constrained PCB layouts in motor drivers and power modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Analog output | Amplified, bidirectional output voltage referenced to REF; drives ADC inputs or comparator thresholds directly without buffering. |
| GND (Pin 2) | Analog ground | Reference return for internal circuitry; must be connected to low-impedance system ground plane to minimize noise coupling into IN± inputs. |
| IN+ (Pin 3) | Current-sense positive input | Connects to bus-voltage side of shunt in high-side config; to load side in low-side config - defines polarity of sensed current direction. |
| IN– (Pin 4) | Current-sense negative input | Connects to load side of shunt in high-side config; to ground side in low-side config - differential pair forms precision current-to-voltage converter. |
| REF (Pin 5) | Reference input | DC bias point for bidirectional output swing; setting REF = VS/2 enables full-scale symmetric output for ±I sensing without dual supplies. |
| VS (Pin 6) | Power supply | 2.7–5.5 V analog supply; bypass with 0.1 µF ceramic capacitor placed ≤2 mm from pin to suppress high-frequency supply noise affecting gain accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | Output swings above/below REF voltage based on current direction - enables single-supply monitoring of charging/discharging currents in battery packs. |
| Matched internal gain resistors | 100 V/V ratio trimmed during wafer test - eliminates external resistor tolerance and thermal tracking errors, improving system-level gain accuracy to ±1% over temperature. |
| Rail-to-rail output | Swings within 30 mV of VS and 5 mV of GND - maximizes dynamic range for 12-bit ADCs operating on 3.3 V or 5 V rails without external level-shifting. |
| Wide common-mode range | Operates with IN+ and IN– at –0.2 V to +26 V regardless of VS - allows direct interface to 24-V industrial buses while powered from isolated 3.3-V logic domain. |
| Low offset drift | 1 µV/°C max - limits current measurement error to <1 mA over 85°C ambient shift in 0.1-Ω shunt, essential for thermal-stable battery SOC estimation. |
Applications
| Motor Control | Battery Monitoring |
|---|---|
Use Scenario: Real-time phase current sensing in 3-phase BLDC motor drives using low-side shunts. IC Role / Device Role / Timing Role: Current-sense amplifier converting shunt voltage to proportional analog output for MCU ADC sampling at ≥20 kHz. Use Value: 150 kHz bandwidth and 2 V/µs slew rate preserve transient fidelity during PWM switching edges, enabling precise field-oriented control (FOC) without current reconstruction artifacts. | Use Scenario: Bidirectional current measurement in lithium-ion battery protection ICs for charge/discharge cycle tracking. IC Role / Device Role / Timing Role: High-accuracy current transducer feeding coulomb counter or protection logic with ±500 µV offset limiting zero-current error. Use Value: 100 V/V gain and rail-to-rail output deliver >3 V full-scale swing on 3.3 V supply, maximizing ADC resolution for sub-10 mA current detection in portable devices. |
| Solar Inverter DC-Link | Industrial Power Management |
Use Scenario: DC-link current monitoring in string inverters to detect ground faults and overcurrent conditions before MPPT stage. IC Role / Device Role / Timing Role: High-side current sensor interfacing to isolation amplifier or sigma-delta ADC for galvanically isolated feedback. Use Value: –0.2 V to +26 V common-mode range accommodates 24-V auxiliary rails and withstands bus transients up to 26 V without clamping or saturation. | Use Scenario: Load current supervision in programmable logic controller (PLC) output modules driving solenoids and relays. IC Role / Device Role / Timing Role: Precision current monitor feeding diagnostic microcontroller to verify actuator engagement and detect open-circuit faults. Use Value: ±1% gain error and 1 µV/°C drift ensure consistent trip thresholds across –40°C to +85°C industrial temperature range, reducing false alarms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A3IDR | 100 V/V gain, wider –4 V to +80 V common-mode range, higher 350 kHz bandwidth, 2.1 mA IQ | Supports higher bus voltages (e.g., 48-V telecom, 72-V EV subsystems); less suitable for ultra-low-power battery monitoring due to 8× higher quiescent current | Select when sensing >26 V rails or requiring faster transient response; avoid if supply budget is <500 µA. |
| MAX40056AUB+ | 100 V/V gain, –0.1 V to +65 V common-mode, 250 kHz bandwidth, 1.2 mA IQ, integrated overvoltage protection | Includes internal clamp diodes and fault flag output; designed for harsh automotive environments with load-dump immunity | Choose for ASIL-B systems needing built-in fault signaling and extended voltage margin; not cost-optimized for consumer-grade power management. |
Compared with INA181A3IDBVT, INA240A3IDR offers superior voltage range and speed at higher power cost, while MAX40056AUB+ adds automotive-grade protection but increases BOM count and cost - INA181A3IDBVT remains optimal for cost-sensitive, 24-V industrial and battery applications demanding <260 µA IQ and ±1% accuracy.
Availability
INA181A3IDBVT is available at Aetrix Electronics and suitable for motor control, battery monitoring, and solar inverter applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production ramp-up.
Supply support for INA181A3IDBVT 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 chain solutions.
The INA181 family targets cost-optimized, high-accuracy current sensing in industrial, automotive, and computing power systems - delivering integrated gain, wide common-mode operation, and low-drift performance without external calibration.
FAQ
What is the maximum common-mode voltage supported by the INA181A3IDBVT?
The INA181A3IDBVT supports a common-mode input voltage range of –0.2 V to +26 V, independent of its 2.7–5.5 V supply voltage. This allows direct high-side sensing on 24-V bus rails without external level-shifting circuitry, and is validated per TI SBOS793H datasheet Section 6.3.
Does the INA181A3IDBVT require external gain-setting resistors?
No - the INA181A3IDBVT integrates a factory-trimmed 100 V/V gain resistor network. This eliminates external component count, improves thermal tracking, and ensures ±1% max gain error over temperature, as specified in Electrical Characteristics Table 6-5 of the official datasheet.
Can the INA181A3IDBVT measure bidirectional current with a single supply?
Yes - the INA181A3IDBVT achieves bidirectional sensing by applying a DC reference voltage (e.g., VS/2) to the REF pin. A positive IN+–IN– differential produces OUT > VREF; a negative differential yields OUT < VREF - enabling full-scale current direction detection on 3.3 V or 5 V supplies.
What is the typical bandwidth and slew rate of the INA181A3IDBVT?
The INA181A3IDBVT has a small-signal bandwidth of 150 kHz and a large-signal slew rate of 2 V/µs, as measured under CLOAD = 10 pF and TA = 25°C (Section 6.5, SBOS793H). These values enable accurate capture of motor current transients and fast fault detection in power converters.
Which package does the INA181A3IDBVT use, and what are its dimensions?
The INA181A3IDBVT uses the DBV package: a 6-pin SOT-23 variant measuring 2.90 mm × 2.80 mm (length × width), including leads. This compact footprint is ideal for dense PCB layouts in motor driver modules and portable power tools, per TI's Mechanical Information Section 11.
INA181A3IDBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 350 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 260µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
INA181A3IDBVT FAQ
1.How can I place an order for INA181A3IDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for INA181A3IDBVT 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 INA181A3IDBVT reliable?
The price and inventory of INA181A3IDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA181A3IDBVT is usually 5 days.
3.What payment methods are accepted for INA181A3IDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA181A3IDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA181A3IDBVT?
INA181A3IDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA181A3IDBVT 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 INA181A3IDBVT?
For technical support, including INA181A3IDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA181A3IDBVT requirements.
6.How does Aetrix verify that INA181A3IDBVT is sourced from the original manufacturer or authorized distributors?
All INA181A3IDBVT 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 INA181A3IDBVT meets industry standards.
7.What is the process for return or replacement of INA181A3IDBVT?
All INA181A3IDBVT units undergo pre-shipment inspection (PSI). If there is an issue with INA181A3IDBVT, 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 INA181A3IDBVT part is unused and in its original packaging.
Return procedure for INA181A3IDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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