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Texas Instruments INA2181A4QDGSRQ1
- Part No.:
- INA2181A4QDGSRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA2181A4QDGSRQ1.pdf
- Description:
- IC CURR SENSE 2 CIRCUIT 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,490
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Product details
Overview
INA2181A4QDGSRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive dual-channel bidirectional current-sense amplifier with 200V/V fixed gain, –0.2V to 26V common-mode input range, ±500µV max offset at 12V VCM, and 105kHz bandwidth. It enables high-accuracy motor phase current monitoring and battery pack cell balancing in 12V/24V automotive power systems.
For engineers reviewing the INA2181A4QDGSRQ1 datasheet, INA2181A4QDGSRQ1 pinout, INA2181A4QDGSRQ1 application, or INA2181A4QDGSRQ1 equivalent, this page delivers verified specifications, dual-channel pin mapping for VSSOP-10, functional safety documentation support, and validated alternatives for automotive current sensing designs requiring bidirectional measurement, rail-to-rail output swing, and operation up to 125°C.
Technical Context
The INA2181A4QDGSRQ1 implements a precision current-shunt monitor architecture with integrated matched resistor gain network (200V/V), enabling accurate bidirectional current measurement independent of supply voltage. Its differential input stage supports common-mode voltages beyond VS - from –0.2V to +26V - making it suitable for both high-side and low-side sensing without level-shifting circuitry.
Each channel features independent REF pins for output offset control, rail-to-rail output swing (within 30mV of VS and 5mV of GND), and 2V/µs slew rate. The device draws ≤500µA quiescent current across –40°C to +125°C, meeting stringent automotive power budget requirements while maintaining ±1% gain error and 1µV/°C offset drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200V/V fixed - enables high-resolution sensing of small shunt voltage drops (e.g., 10mV full-scale → 2V output) |
| Common-mode range | –0.2V to 26V - supports direct connection to 12V/24V bus rails in high-side configurations without attenuation |
| Offset voltage | ±500µV max at VCM = 12V - ensures <0.5% error at 100mV sense voltage, critical for low-current accuracy |
| Bandwidth | 105kHz at CL = 10pF - sufficient for PWM motor control loop feedback and fast fault detection (e.g., short-circuit response) |
| Supply voltage | 2.7V to 5.5V - compatible with standard automotive 3.3V/5V domains and isolated bias supplies |
| Quiescent current | 500µA max - enables always-on monitoring in battery management systems without excessive drain |
| Output swing | Within 30mV of VS and 5mV of GND - maximizes dynamic range for ADC interfacing with 12-bit+ resolution |
Pinout & Package
INA2181A4QDGSRQ1 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 |
|---|---|---|
| 1 (OUT1) | Analog output | Channel 1 voltage output referenced to REF1; linear function of ILOAD × RSENSE × 200 + VREF1 |
| 2 (IN–1) | Analog input | Channel 1 negative input; connects to load side of sense resistor in high-side config or ground side in low-side |
| 3 (IN+1) | Analog input | Channel 1 positive input; connects to bus-voltage side of sense resistor in high-side or load side in low-side |
| 4 (GND) | Analog ground | Reference node for internal circuitry and output swing; must be connected to system analog ground plane |
| 5 (REF1) | Analog input | Channel 1 reference voltage (0 to VS); sets output zero-current baseline for bidirectional sensing |
| 6 (REF2) | Analog input | Channel 2 reference voltage (0 to VS); independently configurable for asymmetric current ranges per channel |
| 7 (IN+2) | Analog input | Channel 2 positive input; electrically isolated from Channel 1 inputs to prevent crosstalk in dual-motor control |
| 8 (IN–2) | Analog input | Channel 2 negative input; supports independent high-/low-side configuration per channel |
| 9 (OUT2) | Analog output | Channel 2 voltage output referenced to REF2; enables simultaneous dual-phase or dual-battery monitoring |
| 10 (VS) | Power supply | 2.7V–5.5V analog supply; powers both channels and internal gain network; requires local 0.1µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Independent REF pins per channel allow zero-center output for forward/reverse current detection without external op-amps |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±3kV / CDM ±1kV ESD robustness - meets automotive reliability standards |
| Functional safety documentation | TI provides FIT rate data, failure mode analysis, and safety manual to accelerate ISO 26262 ASIL-B system certification |
| Matched internal gain resistors | 200V/V ratio maintained via laser-trimmed on-die resistors - eliminates external resistor matching errors and reduces temperature drift to 1.5 ppm/°C |
| Rail-to-rail output | Output swings within 30mV of VS and 5mV of GND - preserves >98% of ADC input range when interfaced to 3.3V microcontrollers |
| High CMRR (84–100 dB) | Maintains accuracy despite bus noise up to 26V common-mode - critical for noisy 12V starter circuits and DC-DC converter outputs |
Applications
| Motor Phase Current Monitoring | Battery Pack Cell Balancing |
|---|---|
|
Use Scenario: Real-time measurement of bidirectional current in each phase of a 3-phase BLDC traction inverter during regenerative braking and motoring. IC Role / Device Role / Timing Role: Dual-channel current-sense amplifier providing synchronized analog outputs for two motor phases, enabling vector control loop closure at ≥10kHz update rates. Use Value: 105kHz bandwidth and 2V/µs slew rate capture rapid current transients during PWM switching; ±500µV offset ensures <1% error at 50mA minimum detectable current. |
Use Scenario: Monitoring individual cell currents in a 12S Li-ion battery pack to trigger active balancing when charge/discharge mismatch exceeds 50mA. IC Role / Device Role / Timing Role: Dual-channel shunt monitor interfaced to MCU ADC, with REF pins biased to mid-supply to resolve ±100mA cell currents. Use Value: 200V/V gain converts 5mV sense drop into 1V output - matching 12-bit ADC full scale; 1µV/°C drift prevents thermal-induced false triggers over temperature. |
| Automotive HVAC Blower Control | 12V/48V Dual-Voltage System Monitoring |
|
Use Scenario: Closed-loop speed regulation of a brushless blower motor using current-derived torque feedback to maintain airflow under varying duct resistance. IC Role / Device Role / Timing Role: High-side current sensor on motor phase leg, with output fed to MCU for real-time torque estimation and commutation timing adjustment. Use Value: –0.2V to 26V common-mode range allows direct connection to 12V battery rail; rail-to-rail output ensures full ADC utilization even at low duty cycles. |
Use Scenario: Simultaneous monitoring of load current on both 12V auxiliary and 48V main power domains in mild-hybrid vehicles to optimize energy routing. IC Role / Device Role / Timing Role: Dual-channel device with Channel 1 on 12V bus (high-side) and Channel 2 on 48V bus (via level-shifted interface), delivering isolated analog current signals. Use Value: Independent REF pins enable different zero-current baselines per channel; 26V VCM rating covers transient spikes on 48V bus when used with external attenuator. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional current-sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A4QDRQ1 | Higher bandwidth (400kHz), wider VCM (–4V to 80V), but higher quiescent current (1.1mA) | Better suited for 48V systems and fast-switching SiC inverters; less optimal for ultra-low-power always-on BMS monitoring | Select when VCM > 26V or bandwidth > 105kHz is required; verify PCB layout accommodates higher supply current |
| MAX40056ATA+T | Single-channel, 200V/V gain, lower offset (±50µV), but no AEC-Q100 qualification and narrower VCM (–0.1V to 26V) | Targeted at industrial servo drives; lacks automotive qualification documentation and functional safety support | Consider only for non-automotive applications where AEC-Q100 and ISO 26262 compliance are not required |
Compared with INA2181A4QDGSRQ1, INA240A4QDRQ1 offers superior bandwidth and voltage range at the cost of higher power consumption, while MAX40056ATA+T provides better DC accuracy but lacks automotive qualification - making INA2181A4QDGSRQ1 the optimal balance of AEC-Q100 compliance, dual-channel integration, and 200V/V gain for mainstream automotive current sensing.
Availability
INA2181A4QDGSRQ1 is available at Aetrix Electronics and suitable for motor control, battery monitors and balancers, and lighting control requiring stable component supply in automotive production programs.
Supply support for INA2181A4QDGSRQ1 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 deep expertise in automotive-grade signal conditioning and power management ICs.
The INA2181-Q1 family was designed specifically for cost-optimized, high-reliability automotive current sensing - delivering bidirectional measurement, wide common-mode range, and functional safety support in compact VSSOP packaging.
FAQ
What is the maximum common-mode voltage supported by the INA2181A4QDGSRQ1?
The INA2181A4QDGSRQ1 supports a common-mode input voltage range of –0.2V to 26V. This specification is independent of the 2.7V–5.5V supply voltage (VS), enabling direct high-side sensing on 12V or 24V automotive bus rails without external level-shifting components. Operation at 26V VCM is validated across the full –40°C to +125°C temperature range.
Does the INA2181A4QDGSRQ1 support bidirectional current measurement?
Yes, the INA2181A4QDGSRQ1 supports true bidirectional current sensing via its dedicated REF pins (REF1 and REF2). Applying a mid-supply voltage (e.g., VS/2) to REF establishes a zero-current output baseline; positive differential input yields output above REF, and negative differential input yields output below REF - enabling detection of forward and reverse current flow in each channel.
What is the gain accuracy and temperature drift of the INA2181A4QDGSRQ1?
The INA2181A4QDGSRQ1 has a maximum gain error of ±1% over –40°C to +125°C, with gain error vs temperature specified at 1.5–20 ppm/°C. Its 200V/V gain is set by laser-trimmed internal resistors, minimizing drift and eliminating external resistor matching errors - ensuring stable scaling across automotive thermal environments.
How does the INA2181A4QDGSRQ1 handle output swing near supply rails?
The INA2181A4QDGSRQ1 provides rail-to-rail output swing: output voltage reaches within 30mV of VS and 5mV of GND under load (RL = 10kΩ). This maximizes usable dynamic range when interfacing with 3.3V or 5V microcontroller ADCs, preserving resolution for low-current measurements without external amplification stages.
Is the INA2181A4QDGSRQ1 qualified for automotive use?
Yes, the INA2181A4QDGSRQ1 is AEC-Q100 Grade 1 qualified (–40°C to +125°C), with HBM ESD classification level 2 (±3kV) and CDM level C6 (±1kV). It also includes functional safety documentation - such as FIT rate data and failure mode analysis - to support ISO 26262 ASIL-B system-level certification in automotive applications.
INA2181A4QDGSRQ1 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:
- 105 kHz
- -3db Bandwidth:
- 105 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
INA2181A4QDGSRQ1 FAQ
1.How can I place an order for INA2181A4QDGSRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2181A4QDGSRQ1 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 INA2181A4QDGSRQ1 reliable?
The price and inventory of INA2181A4QDGSRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2181A4QDGSRQ1 is usually 5 days.
3.What payment methods are accepted for INA2181A4QDGSRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2181A4QDGSRQ1 transactions.
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4.How is shipping managed for INA2181A4QDGSRQ1?
INA2181A4QDGSRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2181A4QDGSRQ1 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 INA2181A4QDGSRQ1?
For technical support, including INA2181A4QDGSRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2181A4QDGSRQ1 requirements.
6.How does Aetrix verify that INA2181A4QDGSRQ1 is sourced from the original manufacturer or authorized distributors?
All INA2181A4QDGSRQ1 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 INA2181A4QDGSRQ1 meets industry standards.
7.What is the process for return or replacement of INA2181A4QDGSRQ1?
All INA2181A4QDGSRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA2181A4QDGSRQ1, 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 INA2181A4QDGSRQ1 part is unused and in its original packaging.
Return procedure for INA2181A4QDGSRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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