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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments INA2181A2QDGSRQ1

Name: INA2181A2QDGSRQ1
Brand: Texas Instruments
SKU: INA2181A2QDGSRQ1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: INA2181A2QDGSRQ1

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Datasheet:: INA2181A2QDGSRQ1.pdf

Description:: IC CURR SENSE 2 CIRCUIT 10VSSOP

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Product details

Overview

INA2181A2QDGSRQ1 from Texas Instruments is a dual-channel, automotive-grade, bidirectional current-sense amplifier with 50V/V fixed gain, –0.2V to 26V common-mode input range, ±500µV max offset at 12V VCM, and 210kHz small-signal bandwidth. It enables high-accuracy shunt-based current monitoring in motor control, battery management, and power supply systems operating across –40°C to +125°C.

For engineers reviewing the INA2181A2QDGSRQ1 datasheet, INA2181A2QDGSRQ1 pinout, INA2181A2QDGSRQ1 application, or INA2181A2QDGSRQ1 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, bidirectional sensing capability with REF-pin offset control, rail-to-rail output swing (≤30mV from VS, ≤5mV from GND), and matched-resistor gain network ensuring ±1% max gain error over temperature.

Technical Context

The INA2181A2QDGSRQ1 implements a precision current-shunt monitor architecture with integrated 50V/V gain resistor network, enabling accurate RTI voltage measurement across sense resistors under high common-mode conditions. Its input stage supports differential sensing with independent IN+ and IN– terminals per channel, referenced to externally applied REF voltages (0 to VS).

It operates from a single 2.7V–5.5V supply while maintaining functional integrity across –0.2V to 26V bus voltages - decoupling sensing capability from supply rails. The device delivers 2V/µs slew rate and 210kHz bandwidth (A2 variant), optimized for fast transient response in motor phase current or fault-detection loops.

Key Specifications

Parameter	Value and Actual Design Meaning
Gain	50V/V fixed - sets output scaling for 50× sensed differential voltage; eliminates external gain components.
Common-mode range	–0.2V to 26V - enables direct high-side sensing on 12V/24V automotive buses without level-shifting.
Offset voltage	±500µV max at VCM = 12V - ensures <1mA error when using 1mΩ shunt at 1A full-scale.
Bandwidth	210kHz - supports accurate current capture in PWM-driven motors up to ~20kHz switching with >10× oversampling.
Supply voltage	2.7V to 5.5V - compatible with standard automotive 3.3V or 5V domain supplies.
Quiescent current	500µA max - enables low-power always-on monitoring in battery-critical systems.
Output swing	Within 30mV of VS and 5mV of GND - maximizes dynamic range for ADC interfacing with 12-bit+ resolution.

Pinout & Package

The INA2181A2QDGSRQ1 is housed in a 10-pin VSSOP package (DGS), measuring 3.00mm × 4.90mm, with exposed thermal pad for enhanced power dissipation in automotive under-hood environments.

Pin/Terminal	Circuit Role	Design Meaning
OUT1, OUT2	Analog output	Amplified, gain-scaled voltage representing I_SENSE × R_SENSE × 50 + V_REF; drives ADC or comparator directly.
IN+1, IN+2	Analog input (+)	Positive terminal for current-sense resistor connection; connects to bus side in high-side, load side in low-side configuration.
IN–1, IN–2	Analog input (–)	Negative terminal for current-sense resistor; connects to load side in high-side, ground side in low-side configuration.
REF1, REF2	Analog reference input	DC bias point for bidirectional output: V_OUT > V_REF indicates forward current; V_OUT < V_REF indicates reverse current.
VS	Power supply	Single 2.7V–5.5V analog supply; powers both channels and internal gain network.
GND	Analog ground	Reference return for all analog signals; must be low-impedance path to minimize measurement error.

Key Features

Feature	Design Value
Bidirectional sensing	Enables net current flow direction detection via REF-pin biasing - critical for regenerative braking and battery charge/discharge monitoring.
AEC-Q100 Grade 1	Qualified for –40°C to +125°C ambient operation with HBM ±3kV / CDM ±1kV ESD robustness - meets automotive electronics reliability requirements.
Matched-resistor gain network	Guarantees ±1% max gain error and <20ppm/°C drift - eliminates calibration overhead in production test and field use.
Rail-to-rail output	Delivers usable signal headroom down to 5mV above GND and within 30mV of VS - preserves full ADC code utilization without external level-shifting.
Functional safety support	Documentation available for ISO 26262 ASIL-B system integration - reduces FMEDA effort for safety-critical powertrain and ADAS subsystems.

Applications

Motor Control	Battery Monitoring
Use Scenario: Real-time phase current sensing in 3-phase BLDC motor drivers for torque control and overcurrent protection. IC Role / Device Role / Timing Role: Dual-channel INA2181A2QDGSRQ1 monitors two motor phases simultaneously with synchronized sampling, feeding data to MCU for FOC algorithm execution. Use Value: 210kHz bandwidth and 2V/µs slew rate enable accurate capture of fast PWM-edge transients, reducing torque ripple and improving efficiency by >2%.	Use Scenario: Bidirectional current measurement in 12V/48V hybrid vehicle battery management systems (BMS) for state-of-charge (SoC) and health (SoH) estimation. IC Role / Device Role / Timing Role: Measures charge (regen) and discharge (acceleration) currents through shared shunt resistor using REF-biased outputs. Use Value: ±500µV offset at 12V VCM ensures <0.5% full-scale error at 100A with 100µΩ shunt, meeting ASIL-C current accuracy targets.
Power Management	Lighting Control
Use Scenario: Input/output current monitoring in automotive DC-DC converters and power distribution units (PDUs) for thermal derating and fault logging. IC Role / Device Role / Timing Role: High-side sensing on 24V input rail and low-side sensing on 5V/3.3V output rails using same device family, simplifying BOM and layout. Use Value: –0.2V to 26V common-mode range allows direct connection without external attenuators or isolators, reducing component count by 3–5 parts per rail.	Use Scenario: LED string current regulation and open/short-circuit detection in adaptive front-lighting systems (AFS) and interior ambient lighting. IC Role / Device Role / Timing Role: Monitors constant-current driver output to validate LED health and detect partial failures before thermal runaway. Use Value: 50V/V gain and rail-to-rail output enable direct interface with 12-bit microcontroller ADCs, achieving ±1% current accuracy across 0.1A–5A range.

Motor Control

Battery Monitoring

Use Scenario: Real-time phase current sensing in 3-phase BLDC motor drivers for torque control and overcurrent protection.

IC Role / Device Role / Timing Role: Dual-channel INA2181A2QDGSRQ1 monitors two motor phases simultaneously with synchronized sampling, feeding data to MCU for FOC algorithm execution.

Use Value: 210kHz bandwidth and 2V/µs slew rate enable accurate capture of fast PWM-edge transients, reducing torque ripple and improving efficiency by >2%.

Use Scenario: Bidirectional current measurement in 12V/48V hybrid vehicle battery management systems (BMS) for state-of-charge (SoC) and health (SoH) estimation.

IC Role / Device Role / Timing Role: Measures charge (regen) and discharge (acceleration) currents through shared shunt resistor using REF-biased outputs.

Use Value: ±500µV offset at 12V VCM ensures <0.5% full-scale error at 100A with 100µΩ shunt, meeting ASIL-C current accuracy targets.

Power Management

Lighting Control

Use Scenario: Input/output current monitoring in automotive DC-DC converters and power distribution units (PDUs) for thermal derating and fault logging.

IC Role / Device Role / Timing Role: High-side sensing on 24V input rail and low-side sensing on 5V/3.3V output rails using same device family, simplifying BOM and layout.

Use Value: –0.2V to 26V common-mode range allows direct connection without external attenuators or isolators, reducing component count by 3–5 parts per rail.

Use Scenario: LED string current regulation and open/short-circuit detection in adaptive front-lighting systems (AFS) and interior ambient lighting.

IC Role / Device Role / Timing Role: Monitors constant-current driver output to validate LED health and detect partial failures before thermal runaway.

Use Value: 50V/V gain and rail-to-rail output enable direct interface with 12-bit microcontroller ADCs, achieving ±1% current accuracy across 0.1A–5A range.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional current-sense amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
INA240A2QDRQ1	Higher bandwidth (400kHz), lower offset (±150µV max), but 100V/V gain only - no 50V/V option.	Preferred for high-speed motor control requiring tighter offset spec; less suitable for mid-range gain needs where 50V/V optimizes ADC utilization.	Select when bandwidth >300kHz or offset <200µV is mandatory; avoid if 50V/V gain alignment with existing shunt/ADC scaling is required.
MAX40056ATA+T	Wider common-mode (–5V to 65V), higher gain options (100V/V, 200V/V), but no AEC-Q100 qualification and 1.2mA quiescent current.	Suitable for industrial or commercial 48V systems; not qualified for automotive safety-critical use cases.	Choose for non-automotive high-voltage applications; reject for automotive Grade 1 deployment due to missing AEC-Q100 and higher IQ.

Compared with INA240A2QDRQ1 and MAX40056ATA+T, the INA2181A2QDGSRQ1 uniquely balances AEC-Q100 compliance, 50V/V gain precision, and 210kHz bandwidth - making it optimal for cost-sensitive, dual-channel automotive current monitoring where gain matching and temperature stability outweigh ultra-low offset or extreme CMV range.

Availability

INA2181A2QDGSRQ1 is available at Aetrix Electronics and suitable for motor control, battery monitoring, and power management applications requiring stable component supply in automotive production programs.

Supply support for INA2181A2QDGSRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and power management solutions.

The INA2181-Q1 product line delivers AEC-Q100-qualified, dual-channel current-sense amplifiers designed specifically for high-reliability automotive power monitoring - emphasizing precision, wide common-mode operation, and functional safety readiness.

FAQ

What is the maximum common-mode voltage supported by the INA2181A2QDGSRQ1?

The INA2181A2QDGSRQ1 supports a common-mode input voltage range of –0.2V to 26V, independent of its 2.7V–5.5V supply voltage. This allows direct high-side sensing on 12V or 24V automotive buses without external level-shifting circuitry. The specification is validated across the full –40°C to +125°C operating temperature range, and the device remains functional even when VCM exceeds VS by more than 20V.

Does the INA2181A2QDGSRQ1 support bidirectional current sensing, and how is it implemented?

Yes, the INA2181A2QDGSRQ1 supports true bidirectional current sensing via its REF1 and REF2 pins. Applying a DC bias (e.g., VS/2) to each REF pin establishes a zero-current output midpoint. Positive differential input yields V_OUT > V_REF; negative differential input yields V_OUT < V_REF. This enables net current direction detection in battery charge/discharge and regenerative braking systems without polarity-switching hardware.

What is the gain accuracy and temperature drift performance of the INA2181A2QDGSRQ1?

The INA2181A2QDGSRQ1 features ±1% maximum gain error over –40°C to +125°C and a gain error drift of ≤20ppm/°C. Its monolithic matched-resistor gain network eliminates external component tolerance dependencies, ensuring consistent 50V/V scaling across temperature and unit-to-unit variation - critical for production-line calibration efficiency and long-term system accuracy in automotive applications.

How does the output swing specification of the INA2181A2QDGSRQ1 impact ADC interfacing?

The INA2181A2QDGSRQ1 provides rail-to-rail output swing, with maximum deviation of 30mV from VS and 5mV from GND. When powered from 3.3V and biased at 1.65V REF, this delivers >3.2V of usable output range - enabling full utilization of a 12-bit ADC's 0–4095 codes without external op-amp buffering or level-shifting, thereby reducing BOM cost and PCB area in space-constrained automotive modules.

Is the INA2181A2QDGSRQ1 qualified for automotive safety-critical systems?

Yes, the INA2181A2QDGSRQ1 is AEC-Q100 Grade 1 qualified (–40°C to +125°C) and designated as functional safety-capable. Texas Instruments provides FIT rate data, failure mode documentation, and safety analysis reports to support ISO 26262 ASIL-B integration. While the device itself is not ASIL-certified, its documented behavior and diagnostic coverage enable compliant system-level safety architectures in powertrain and chassis control applications.

INA2181A2QDGSRQ1 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Amplifier Type:: Current Sense

Number of Circuits:: 2

Output Type:: Rail-to-Rail

Slew Rate:: 2V/µs

Gain Bandwidth Product:: 210 kHz

-3db Bandwidth:: 210 kHz

Current - Input Bias:: 75 µA

Voltage - Input Offset:: 100 µV

Current - Supply:: 356µA

Current - Output / Channel:: -

Voltage - Supply Span (Min):: 2.7 V

Voltage - Supply Span (Max):: 5.5 V

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 10-VSSOP

INA2181A2QDGSRQ1 FAQ

1.How can I place an order for INA2181A2QDGSRQ1 through Aetrix?

Please submit a Request for Quotation (RFQ) for INA2181A2QDGSRQ1 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 INA2181A2QDGSRQ1 reliable?

The price and inventory of INA2181A2QDGSRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2181A2QDGSRQ1 is usually 5 days.

3.What payment methods are accepted for INA2181A2QDGSRQ1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2181A2QDGSRQ1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for INA2181A2QDGSRQ1?

INA2181A2QDGSRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your INA2181A2QDGSRQ1 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 INA2181A2QDGSRQ1?

For technical support, including INA2181A2QDGSRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2181A2QDGSRQ1 requirements.

6.How does Aetrix verify that INA2181A2QDGSRQ1 is sourced from the original manufacturer or authorized distributors?

All INA2181A2QDGSRQ1 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 INA2181A2QDGSRQ1 meets industry standards.

7.What is the process for return or replacement of INA2181A2QDGSRQ1?

All INA2181A2QDGSRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA2181A2QDGSRQ1, 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 INA2181A2QDGSRQ1 part is unused and in its original packaging.

Return procedure for INA2181A2QDGSRQ1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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