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Texas Instruments INA181A2IDBVR
- Part No.:
- INA181A2IDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
INA181A2IDBVR.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:7,450
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Product details
Overview
INA181A2IDBVR 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 50 V/V fixed gain, –0.2 V to +26 V input common-mode range, ±500 µV max offset at 12 V VCM, 210 kHz bandwidth, and 2 V/µs slew rate - enabling precise motor control and battery monitoring in 2.7–5.5 V systems.
For engineers reviewing the INA181A2IDBVR datasheet, INA181A2IDBVR pinout, INA181A2IDBVR application, or INA181A2IDBVR equivalent, this page delivers verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options - all grounded in TI's SBOS793H production data sheet (Nov 2023 revision).
Technical Context
The INA181A2IDBVR implements a precision current-shunt monitor architecture with integrated matched-resistor gain network (50 V/V), enabling accurate bidirectional sensing independent of supply voltage. Its proprietary topology supports common-mode voltages up to 26 V while operating from only 2.7–5.5 V, making it suitable for high-side bus monitoring without level-shifting.
It uses a rail-to-rail output stage with ≤30 mV swing to VS and ≤5 mV to GND, referenced to an externally applied REF voltage that sets zero-current output level. Input bias current remains below 75 µA across –0.2–26 V VCM, ensuring minimal error in low-RSENSE applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50 V/V fixed - eliminates external gain-setting resistors and reduces temperature drift vs discrete solutions. |
| Common-mode range | –0.2 V to +26 V - enables direct high-side sensing on 24-V industrial buses without attenuation or isolation. |
| Offset voltage | ±500 µV max at 12 V VCM - ensures <1% error for 10-mΩ shunts carrying ≥10 A, critical for battery pack balancing. |
| Bandwidth | 210 kHz - supports fast transient detection in motor phase current control loops with <5-µs response time. |
| Quiescent current | 260 µA max - allows continuous monitoring in always-on power management subsystems with minimal battery drain. |
| Output swing | VS – 30 mV / GND + 5 mV - maximizes dynamic range for ADC interfacing with 12-bit or higher resolution. |
| Supply voltage | 2.7 V to 5.5 V - compatible with standard logic rails and low-voltage microcontrollers (e.g., MSP430, STM32L series). |
Pinout & Package
The INA181A2IDBVR is packaged in a 6-pin SOT-23 (DBV) measuring 2.90 mm × 2.80 mm, optimized for space-constrained PCB layouts in motor drives and portable power systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Analog output | Amplified, bidirectional current-sense voltage referenced to REF; drives ADC inputs directly with rail-to-rail capability. |
| GND (Pin 2) | Analog ground | Reference node for internal circuitry; must be connected to low-impedance system ground plane to minimize noise coupling. |
| IN+ (Pin 3) | Positive input | Connects to bus-voltage side of sense resistor in high-side config; load side in low-side config - defines current direction polarity. |
| IN– (Pin 4) | Negative input | Connects to load side of sense resistor in high-side config; ground side in low-side config - completes differential measurement path. |
| REF (Pin 5) | Reference input | Sets zero-current output level (e.g., 2.5 V for ±2.5-V output swing); enables bidirectional current indication without dual supplies. |
| VS (Pin 6) | Power supply | 2.7–5.5 V analog supply; requires local 0.1-µF ceramic bypass capacitor to GND per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | Enables single-shunt monitoring of charging/discharging currents in battery management systems without polarity-switching circuitry. |
| Matched-resistor gain network | Reduces gain error to ±1% max and minimizes drift (<20 ppm/°C), eliminating calibration overhead in production test. |
| Rail-to-rail output | Delivers full-scale signal to 12-bit+ SAR ADCs without external level-shifting, preserving SNR and simplifying signal chain design. |
| High CMRR (100 dB typ) | Maintains accuracy in noisy environments (e.g., motor drive inverters) where bus transients exceed 10 V/µs. |
| Extended temperature range | Specified from –40°C to +125°C - supports under-hood automotive, industrial motor control, and solar inverter applications. |
Applications
| Motor Control | Battery Monitoring |
|---|---|
Use Scenario: Real-time phase current feedback in BLDC motor drives using single-shunt topology. IC Role / Device Role / Timing Role: Current-sense amplifier converting mV-level RSENSE voltage to scalable analog output synchronized with PWM switching. Use Value: Enables field-oriented control (FOC) with <1% current measurement error across 0–100% load, improving torque ripple and efficiency. | Use Scenario: Cell-level current monitoring in 48-V lithium-ion battery packs for state-of-charge (SoC) and state-of-health (SoH) estimation. IC Role / Device Role / Timing Role: Bidirectional shunt amplifier feeding isolated sigma-delta ADCs in battery management ICs (e.g., BQ796xx). Use Value: Supports ±100-A sensing with 10-mΩ shunts while maintaining <0.5% gain error over temperature - critical for coulomb counting accuracy. |
| Power Management | Solar Inverters |
Use Scenario: Input/output current supervision in DC-DC converters for telecom and server PSUs. IC Role / Device Role / Timing Role: High-side current monitor on 12-V or 48-V input rails, interfacing with PMBus-compliant controllers. Use Value: Detects overcurrent faults within 5 µs (via comparator interface) and provides analog telemetry for adaptive load shedding. | Use Scenario: String-level current monitoring in central and string inverters for MPPT optimization and arc-fault detection. IC Role / Device Role / Timing Role: Low-drift, high-CMRR amplifier measuring up to 26-V PV string voltage with milliamp-level resolution. Use Value: Enables <0.1% power loss budget allocation to sensing circuitry while surviving 100-V transients per IEC 61000-4-5. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A2IDR | 50 V/V gain, wider –4-V to +80-V common-mode range, higher 400-kHz bandwidth, 1.1-mA IQ | Supports higher bus voltages (e.g., 48-V EV systems) but consumes >4× more quiescent current | Choose INA240A2IDR when sensing >26-V rails; INA181A2IDBVR remains optimal for cost-sensitive 24-V industrial designs with strict power budgets. |
| MAX40056ATA+T | 50 V/V gain, –0.1-V to +65-V common-mode, 250-kHz bandwidth, 350-µA IQ, integrated overvoltage protection | Includes built-in fault clamping for ±65-V transients - eliminates external TVS diodes in harsh environments | Select MAX40056ATA+T for automotive-grade reliability in 12-V/24-V systems requiring AEC-Q100 qualification; INA181A2IDBVR suits non-automotive industrial use with tighter cost targets. |
Compared with INA240A2IDR and MAX40056ATA+T, the INA181A2IDBVR offers the lowest quiescent current (260 µA) and smallest footprint (SOT-23) among 50-V/V bidirectional amplifiers, making it ideal for space- and power-constrained embedded systems where 26-V bus compliance is sufficient.
Availability
INA181A2IDBVR 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 from authorized channels.
Supply support for INA181A2IDBVR 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 power management ICs.
The INA181 family was designed specifically for cost-optimized, high-accuracy bidirectional current sensing in industrial, automotive, and renewable energy systems - delivering factory-trimmed performance without external calibration.
FAQ
What is the maximum common-mode voltage supported by the INA181A2IDBVR?
The INA181A2IDBVR 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 industrial buses without external level-shifting circuitry. The specification is guaranteed across the full –40°C to +125°C operating temperature range per TI SBOS793H.
How does the REF pin function in the INA181A2IDBVR?
The REF pin in the INA181A2IDBVR sets the output voltage corresponding to zero sensed current. When biased at VS/2 (e.g., 2.5 V with 5-V supply), the output swings symmetrically above and below that reference - enabling true bidirectional current indication. The pin accepts 0 to VS and must be driven by a low-impedance source; floating REF results in undefined output behavior.
Can the INA181A2IDBVR be used in low-side current sensing applications?
Yes, the INA181A2IDBVR is fully specified for low-side current sensing, with ±150 µV maximum offset voltage at 0-V common-mode voltage. Its matched-resistor gain network and rail-to-rail output ensure high accuracy even with small shunt voltages (e.g., 10 mV full-scale), minimizing power loss and supporting wide dynamic range measurements in battery and power supply monitoring.
What is the bandwidth and slew rate of the INA181A2IDBVR?
The INA181A2IDBVR has a small-signal bandwidth of 210 kHz and a large-signal slew rate of 2 V/µs. These specifications enable accurate capture of fast current transients in motor control and fault detection applications. Bandwidth is measured with 10-pF capacitive load; slew rate ensures <5-µs response to full-scale step inputs, critical for closed-loop stability in FOC algorithms.
Is the INA181A2IDBVR pin-compatible with other variants in the INAx181 family?
Yes, the INA181A2IDBVR shares identical pinout and package (6-pin SOT-23 DBV) with all other INA181 variants (A1/A3/A4), differing only in fixed gain (20/100/200 V/V). This allows drop-in replacement during design iteration or production tuning without PCB changes - provided the REF voltage and output scaling are adjusted accordingly for the new gain setting.
INA181A2IDBVR 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
INA181A2IDBVR FAQ
1.How can I place an order for INA181A2IDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA181A2IDBVR 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 INA181A2IDBVR reliable?
The price and inventory of INA181A2IDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA181A2IDBVR is usually 5 days.
3.What payment methods are accepted for INA181A2IDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA181A2IDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA181A2IDBVR?
INA181A2IDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA181A2IDBVR 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 INA181A2IDBVR?
For technical support, including INA181A2IDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA181A2IDBVR requirements.
6.How does Aetrix verify that INA181A2IDBVR is sourced from the original manufacturer or authorized distributors?
All INA181A2IDBVR 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 INA181A2IDBVR meets industry standards.
7.What is the process for return or replacement of INA181A2IDBVR?
All INA181A2IDBVR units undergo pre-shipment inspection (PSI). If there is an issue with INA181A2IDBVR, 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 INA181A2IDBVR part is unused and in its original packaging.
Return procedure for INA181A2IDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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