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Texas Instruments INA181A3QDCKRQ1
- Part No.:
- INA181A3QDCKRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
INA181A3QDCKRQ1.pdf
- Description:
- AEC-Q100, 26V, BI-DIRECTIONAL, 3
- Quantity:
- Payment:
- Shipping:
Inventory:2,870
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Product details
Overview
INA181A3QDCKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive bidirectional current-sense amplifier with 100 V/V fixed gain, –0.2 V to 26 V input common-mode range, ±500 µV max offset at 12 V VCM, and 150 kHz small-signal bandwidth - used for precision motor phase current monitoring in high-side or low-side configurations.
For engineers reviewing the INA181A3QDCKRQ1 datasheet, INA181A3QDCKRQ1 pinout, INA181A3QDCKRQ1 application, or INA181A3QDCKRQ1 equivalent, key selection criteria include bidirectional sensing capability, rail-to-rail output swing (≤30 mV from VS, ≤5 mV from GND), functional safety documentation support, ±1% max gain error over –40°C to +125°C, and SC70-6 package compatibility with space-constrained automotive PCB layouts.
Technical Context
The INA181A3QDCKRQ1 employs a precision current-shunt monitor architecture with integrated matched resistor gain network optimized for bidirectional sensing. Its input stage operates independently of supply voltage, enabling accurate measurement across –0.2 V to 26 V common-mode voltages while powered from only 2.7 V to 5.5 V.
It delivers 150 kHz bandwidth and 2 V/µs slew rate for fast transient response in motor control fault detection, supports reference-voltage–based output centering for bidirectional current polarity indication, and maintains ±1 µV/°C max offset drift over full automotive temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100 V/V - fixed internal ratio enabling direct conversion of 10 mV sense voltage to 1 V output, simplifying ADC interface design |
| Common-mode Range | –0.2 V to 26 V - supports high-side sensing on 12 V/24 V bus rails and low-side sensing near ground without level-shifting |
| Offset Voltage | ±500 µV max at VCM = 12 V - ensures <0.5% error at 100 mV full-scale sense voltage, critical for low-current accuracy |
| Bandwidth | 150 kHz - sufficient for PWM motor current reconstruction up to ~15 kHz switching frequencies with <1% gain error |
| Supply Voltage | 2.7 V to 5.5 V - compatible with standard automotive 3.3 V or 5 V domains, independent of sensed rail voltage |
| Quiescent Current | 260 µA max - enables always-on battery monitoring with minimal parasitic drain in sleep modes |
| Output Swing | Within 30 mV of VS and 5 mV of GND - maximizes dynamic range for 12-bit+ ADCs without external biasing |
Pinout & Package
The INA181A3QDCKRQ1 is packaged in a 6-pin SC70 (DCK) footprint measuring 2.00 mm × 2.10 mm, suitable for high-density automotive PCB layouts with thermal performance characterized by RθJA = 188.0°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Analog input | Positive input of differential sense amplifier; connects to bus-voltage side of shunt in high-side, load side in low-side |
| IN− | Analog input | Negative input of differential sense amplifier; connects to load side of shunt in high-side, ground side in low-side |
| OUT | Analog output | Voltage output = GAIN × (IN+ − IN−) + VREF; rail-to-rail capable with ≤30 mV headroom to VS |
| REF | Analog input | Reference bias for bidirectional operation; sets output midpoint (e.g., 2.5 V for ±2.5 V current range) |
| GND | Analog ground | Return path for internal circuitry and output stage; must be low-impedance connection to system AGND |
| VS | Power supply | 2.7 V–5.5 V analog supply; powers internal amplifier and reference buffer; bypass with 0.1 µF ceramic |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | Enables single-device measurement of forward/reverse motor current or battery charge/discharge via REF pin biasing |
| AEC-Q100 Grade 1 | Qualified for –40°C to +125°C ambient operation with HBM ±3 kV / CDM ±1 kV ESD robustness for under-hood environments |
| Matched internal gain resistors | Eliminates external resistor matching errors and reduces temperature-induced gain drift to 1.5 ppm/°C typical |
| Rail-to-rail output | Supports full-scale output from 5 mV above GND to 30 mV below VS, preserving >98% of 3.3 V ADC range |
| Functional safety documentation | Includes FIT rate, failure mode analysis, and diagnostic coverage data to accelerate ISO 26262 ASIL-B system certification |
Applications
| Motor Control | Battery Monitoring |
|---|---|
Use Scenario: Real-time phase current sensing in 3-phase BLDC motor drives for field-oriented control (FOC). IC Role / Device Role / Timing Role: High-bandwidth (150 kHz) bidirectional current amplifier placed on low-side shunts, synchronized to PWM gate signals. Use Value: Enables precise torque regulation and overcurrent shutdown within 6.7 µs (1/(150 kHz)), reducing motor thermal stress during transients. | Use Scenario: Continuous current monitoring of 12 V lead-acid or Li-ion starter batteries in start-stop systems. IC Role / Device Role / Timing Role: Low-quiescent-current (260 µA) shunt amplifier measuring charge/discharge cycles with ±500 µV offset stability over temperature. Use Value: Achieves <1% SOC error over lifetime by maintaining gain error ≤±1% and offset drift ≤1 µV/°C across –40°C to +125°C. |
| Lighting Control | Power Management |
Use Scenario: LED string current regulation in adaptive front-lighting systems (AFS) with PWM dimming. IC Role / Device Role / Timing Role: High CMRR (84 dB min) current monitor rejecting battery ripple noise while tracking fast PWM-modulated LED currents. Use Value: Maintains consistent lumen output despite 12 V rail fluctuations up to 26 V, eliminating visible flicker during load dump events. | Use Scenario: Input current supervision in automotive DC-DC converters for OCP and thermal derating. IC Role / Device Role / Timing Role: High-side current sense amplifier operating at 24 V bus with –0.2 V to 26 V common-mode tolerance and 2 V/µs slew rate. Use Value: Detects short-circuit faults in <500 ns (limited by comparator response), preventing MOSFET destruction during hard shorts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA181A2QDCKRQ1 | 50 V/V gain (vs. 100 V/V); same package, offset, bandwidth, and temp range | Suitable for higher sense voltage ranges (e.g., 20 mV–200 mV), less sensitive to PCB layout noise | Select when full-scale sense voltage exceeds 10 mV to maintain SNR and avoid output saturation |
| INA240A1QDRQ1 | Bi-directional, 20 V/V gain, wider –4 V to 80 V common-mode, higher 400 kHz bandwidth, 10-pin VSSOP | Targeted at high-voltage traction inverters and industrial 48 V systems; requires different PCB footprint | Choose for >26 V bus applications or where >350 kHz bandwidth is required for >35 kHz PWM control loops |
Compared with INA181A2QDCKRQ1, the INA181A3QDCKRQ1 provides double gain for improved resolution at low sense voltages but reduced dynamic range; versus INA240A1QDRQ1, it offers smaller SC70-6 footprint and lower quiescent current but lacks extended common-mode capability for 48 V+ systems.
Availability
INA181A3QDCKRQ1 is available at Aetrix Electronics and suitable for motor control, battery monitoring, lighting control, and power management applications requiring stable component supply for automotive production programs.
Supply support for INA181A3QDCKRQ1 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 delivering analog and embedded processing solutions for automotive, industrial, and personal electronics markets.
The INA181-Q1 product line delivers cost-optimized, AEC-Q100 qualified current-sense amplifiers for bidirectional, high-accuracy shunt-based current measurement in space- and power-constrained automotive subsystems.
FAQ
What is the maximum common-mode voltage supported by the INA181A3QDCKRQ1?
The INA181A3QDCKRQ1 supports a common-mode input voltage range of –0.2 V to 26 V, independent of its 2.7 V to 5.5 V supply voltage. This allows direct high-side sensing on 12 V or 24 V automotive buses without external level-shifting circuitry. The specification is validated across the full –40°C to +125°C operating temperature range per AEC-Q100 Grade 1 requirements.
Does the INA181A3QDCKRQ1 support bidirectional current sensing?
Yes, the INA181A3QDCKRQ1 supports true bidirectional current sensing via its REF pin. Applying a reference voltage (e.g., VS/2 = 2.5 V) centers the output: positive differential input produces OUT > VREF, negative differential input produces OUT < VREF. This enables single-supply measurement of both charging and discharging currents in battery systems without polarity-switching circuitry.
What is the gain accuracy specification for the INA181A3QDCKRQ1 over temperature?
The INA181A3QDCKRQ1 has a maximum gain error of ±1% over the full operating temperature range of –40°C to +125°C. Its gain error vs. temperature is specified at 1.5 ppm/°C typical, ensuring minimal drift during thermal cycling. This accuracy is achieved through laser-trimmed, matched internal gain resistors - no external calibration is required for most automotive applications.
Which package does the INA181A3QDCKRQ1 use, and what are its dimensions?
The INA181A3QDCKRQ1 uses the SC70-6 (DCK) package, measuring 2.00 mm × 2.10 mm with a nominal height of 0.9 mm. This compact footprint is optimized for space-constrained automotive modules such as motor control ECUs and body control units. Thermal resistance is characterized at RθJA = 188.0°C/W, supporting reliable operation in sealed enclosures.
How does the INA181A3QDCKRQ1 handle output voltage swing near supply rails?
The INA181A3QDCKRQ1 features rail-to-rail output capability with guaranteed swing to within 30 mV of VS and 5 mV of GND under 10 kΩ load conditions across –40°C to +125°C. This preserves >98% of the dynamic range for a 3.3 V ADC, eliminating need for external level-shifting or biasing networks in most automotive signal chains.
INA181A3QDCKRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Single Ended, Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 150 kHz
- Current - Input Bias:
- 75 µA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 195µA
- Current - Output / Channel:
- 8 mA
- 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:
- SC-70-6
INA181A3QDCKRQ1 FAQ
1.How can I place an order for INA181A3QDCKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA181A3QDCKRQ1 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 INA181A3QDCKRQ1 reliable?
The price and inventory of INA181A3QDCKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA181A3QDCKRQ1 is usually 5 days.
3.What payment methods are accepted for INA181A3QDCKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA181A3QDCKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA181A3QDCKRQ1?
INA181A3QDCKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA181A3QDCKRQ1 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 INA181A3QDCKRQ1?
For technical support, including INA181A3QDCKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA181A3QDCKRQ1 requirements.
6.How does Aetrix verify that INA181A3QDCKRQ1 is sourced from the original manufacturer or authorized distributors?
All INA181A3QDCKRQ1 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 INA181A3QDCKRQ1 meets industry standards.
7.What is the process for return or replacement of INA181A3QDCKRQ1?
All INA181A3QDCKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA181A3QDCKRQ1, 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 INA181A3QDCKRQ1 part is unused and in its original packaging.
Return procedure for INA181A3QDCKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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