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Texas Instruments INA181A1QDCKRQ1
- Part No.:
- INA181A1QDCKRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
INA181A1QDCKRQ1.pdf
- Description:
- AEC-Q100, 26V, BI-DIRECTIONAL, 3
- Quantity:
- Payment:
- Shipping:
Inventory:2,935
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Product details
Overview
INA181A1QDCKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive current-sense amplifier designed for bidirectional, high-accuracy shunt-based current monitoring in both low-side and high-side configurations. It features 20V/V fixed gain, ±150µV max offset at 0V common-mode, 350kHz bandwidth, and operates from 2.7V–5.5V supply across –40°C to +125°C - enabling precise motor control and battery monitoring in 12V/24V automotive power systems.
For engineers reviewing the INA181A1QDCKRQ1 datasheet, INA181A1QDCKRQ1 pinout, INA181A1QDCKRQ1 application, or INA181A1QDCKRQ1 equivalent, key selection criteria include its 20V/V gain option, SC70-6 package footprint, –0.2V to 26V input common-mode range independent of supply, and functional safety documentation support for ASIL-B system integration.
Technical Context
The INA181A1QDCKRQ1 employs a precision current-shunt monitor architecture with integrated matched resistor gain network, delivering 20V/V fixed gain and minimizing temperature-induced gain drift (≤20 ppm/°C). Its input stage supports true bidirectional sensing via REF pin biasing, enabling output voltage polarity to reflect current direction relative to the reference level.
It achieves rail-to-rail output swing (within 30 mV of VS and 5 mV of GND), supports 2 V/µs slew rate for fast transient response, and maintains CMRR ≥84 dB over –40°C to +125°C - critical for rejecting noise in high-dV/dt automotive bus environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V fixed - sets output scaling for 50mV full-scale sense voltage to 1V output, simplifying ADC interface design |
| Input Common-Mode Range | –0.2V to 26V - enables direct connection to 12V/24V battery rails without level-shifting, even when powered from 3.3V |
| Offset Voltage (max) | ±150µV at VCM = 0V - ensures ≤0.3% error at 50mV sense voltage, supporting accurate low-current detection |
| Bandwidth | 350kHz - captures fast current transients in BLDC motor commutation and short-circuit fault events |
| Quiescent Current | 260µA max - allows continuous monitoring in always-on vehicle subsystems without excessive battery drain |
| Supply Voltage | 2.7V to 5.5V - compatible with standard automotive LDO outputs and microcontroller I/O domains |
| Temperature Range | –40°C to +125°C - qualified for under-hood and powertrain applications per AEC-Q100 Grade 1 |
Pinout & Package
The INA181A1QDCKRQ1 is packaged in a 6-pin SC70 (DCK) package measuring 2.00mm × 2.10mm, optimized for space-constrained automotive PCB layouts while maintaining thermal performance (RθJA = 188°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 ≤30mV headroom to VS |
| REF | Analog input | Reference bias point for bidirectional operation; sets zero-current output level (e.g., 2.5V for ±2.5V output swing) |
| VS | Power supply | 2.7V–5.5V analog supply; powers internal amplifier and reference circuitry |
| GND | Analog ground | Return path for supply and signal; must be connected to low-impedance system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Enabled by REF pin biasing - supports both charging and discharging current measurement in battery management without external op-amps |
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C) and HBM/CDM ESD rated - validated for deployment in safety-critical vehicle subsystems |
| High CMRR | ≥84 dB over full temperature range - rejects common-mode noise from switching regulators and ignition systems |
| Low offset drift | 1 µV/°C max - maintains accuracy across engine bay thermal cycles without recalibration |
| Functional safety support | Documentation available for ISO 26262 ASIL-B system-level analysis - reduces validation effort for automotive OEMs |
Applications
| Motor Control | Battery Monitoring |
|---|---|
Use Scenario: Real-time phase current sensing in 3-phase BLDC traction inverters for torque control and field-oriented control (FOC). IC Role / Device Role / Timing Role: High-side current shunt monitor providing isolated, high-bandwidth analog feedback to MCU ADC with <1µs latency. Use Value: 350kHz bandwidth and 2V/µs slew rate enable accurate capture of PWM-edge current spikes, improving motor efficiency and reducing torque ripple. | Use Scenario: Bidirectional current measurement in 48V mild-hybrid battery packs during charge/discharge cycles and regenerative braking. IC Role / Device Role / Timing Role: Low-drift, rail-to-rail output current-sense amplifier interfacing directly to 12-bit SAR ADC in battery management unit (BMU). Use Value: ±150µV offset at 0V VCM enables sub-10mA resolution at 100µΩ shunt, supporting precise state-of-charge (SoC) estimation. |
| Power Management | Lighting Control |
Use Scenario: Overcurrent protection and dynamic load current reporting in automotive DC-DC converters supplying ADAS ECUs. IC Role / Device Role / Timing Role: High-side current monitor feeding fast comparator for <100ns fault response, plus slow-path ADC for telemetry. Use Value: 26V common-mode range allows direct sensing on converter high-side switch node without isolation, reducing BOM cost and layout complexity. | Use Scenario: LED string current regulation and open-circuit fault detection in adaptive front-lighting systems (AFS). IC Role / Device Role / Timing Role: Low-side current monitor with REF-biased output driving PWM dimming controller and diagnostic logic. Use Value: 20V/V gain and rail-to-rail output ensure full ADC utilization across 0–2A LED range, enabling closed-loop brightness stability within ±1%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | Higher bandwidth (400kHz), lower offset (±20µV), but 8-pin SOIC package and higher quiescent current (1.1mA) | Preferred for ultra-high-precision motor control where layout space permits larger package and higher power budget allows | Select when >350kHz bandwidth or <±50µV offset is required; avoid if SC70 footprint or <300µA IQ is mandatory |
| MAX40056ATA+T | Wider common-mode (–5V to 65V), 100V/V gain option, but no AEC-Q100 qualification and higher offset (±500µV) | Suitable for industrial 48V systems requiring extended voltage range, not for automotive safety-critical use | Choose only for non-automotive applications needing >26V VCM; reject for ASIL-compliant designs due to lack of AEC-Q100 certification |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the INA181A1QDCKRQ1 delivers optimal balance of AEC-Q100 compliance, SC70 footprint, 350kHz bandwidth, and 260µA IQ - making it the preferred choice for space- and power-constrained automotive current sensing where Grade 1 temperature operation is mandatory.
Availability
INA181A1QDCKRQ1 is available at Aetrix Electronics and suitable for motor control, battery monitoring, and automotive lighting applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production programs.
Supply support for INA181A1QDCKRQ1 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 IC design and functional safety certification.
The INA181-Q1 product line targets cost-optimized, high-reliability current sensing in automotive power systems - specifically engineered for bidirectional shunt monitoring in motor drives, battery management, and power distribution units operating across extended temperature ranges.
FAQ
What is the maximum common-mode voltage supported by the INA181A1QDCKRQ1?
The INA181A1QDCKRQ1 supports a common-mode input voltage range of –0.2V to 26V, independent of its 2.7V–5.5V supply voltage. This allows direct connection to 12V or 24V automotive battery rails in high-side configurations without external level-shifting circuitry. The specification is guaranteed over the full –40°C to +125°C operating temperature range.
Does the INA181A1QDCKRQ1 require external components for basic operation?
No, the INA181A1QDCKRQ1 requires only a 0.1µF bypass capacitor between VS and GND for stable operation. Its integrated 20V/V gain network eliminates external resistors, and bidirectional operation is enabled solely by applying a reference voltage to the REF pin - no additional op-amps or signal conditioning are needed for standard current sensing.
How does the REF pin function in the INA181A1QDCKRQ1?
The REF pin sets the output voltage baseline for bidirectional current sensing. When VREF = VS/2 (e.g., 2.5V with 5V supply), a positive differential input produces OUT > VREF, and a negative differential input produces OUT < VREF. This enables single-supply systems to measure both charge and discharge currents using one analog input channel on the host MCU.
Is the INA181A1QDCKRQ1 pin-compatible with other variants in the INAx181-Q1 family?
Yes, all INAx181-Q1 variants - including INA181A1QDCKRQ1 (20V/V), INA181A2QDCKRQ1 (50V/V), and INA181A3QDCKRQ1 (100V/V) - share identical 6-pin SC70 (DCK) pinout and package dimensions. Gain selection is factory-set; no layout change is required when upgrading or downgrading gain options within the same package variant.
What functional safety documentation is available for the INA181A1QDCKRQ1?
Texas Instruments provides functional safety documentation for the INA181A1QDCKRQ1, including FMEDA reports, safety manuals, and diagnostic coverage analysis aligned with ISO 26262 ASIL-B requirements. These materials support systematic hardware development and integration into automotive safety-related systems without requiring customer-level failure mode analysis.
INA181A1QDCKRQ1 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:
- 350 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
INA181A1QDCKRQ1 FAQ
1.How can I place an order for INA181A1QDCKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA181A1QDCKRQ1 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 INA181A1QDCKRQ1 reliable?
The price and inventory of INA181A1QDCKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA181A1QDCKRQ1 is usually 5 days.
3.What payment methods are accepted for INA181A1QDCKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA181A1QDCKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA181A1QDCKRQ1?
INA181A1QDCKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA181A1QDCKRQ1 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 INA181A1QDCKRQ1?
For technical support, including INA181A1QDCKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA181A1QDCKRQ1 requirements.
6.How does Aetrix verify that INA181A1QDCKRQ1 is sourced from the original manufacturer or authorized distributors?
All INA181A1QDCKRQ1 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 INA181A1QDCKRQ1 meets industry standards.
7.What is the process for return or replacement of INA181A1QDCKRQ1?
All INA181A1QDCKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA181A1QDCKRQ1, 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 INA181A1QDCKRQ1 part is unused and in its original packaging.
Return procedure for INA181A1QDCKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA181A1QDCKRQ1 Tags
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