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Texas Instruments INA181A2QDCKRQ1
- Part No.:
- INA181A2QDCKRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
INA181A2QDCKRQ1.pdf
- Description:
- AEC-Q100, 26V, BI-DIRECTIONAL, 3
- Quantity:
- Payment:
- Shipping:
Inventory:2,687
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Product details
Overview
INA181A2QDCKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive bidirectional current-sense amplifier with 50V/V fixed gain, –0.2V to 26V common-mode input range, ±500µV max offset at 12V VCM, and 2V/µs slew rate. It enables precision low- and high-side current monitoring in motor control, battery management, and power supply systems.
For engineers reviewing the INA181A2QDCKRQ1 datasheet, INA181A2QDCKRQ1 pinout, INA181A2QDCKRQ1 application, or INA181A2QDCKRQ1 equivalent, key selection criteria include its 50V/V gain accuracy (±1% max), rail-to-rail output swing (within 30mV of VS and 5mV of GND), bidirectional sensing capability via REF pin biasing, and operation across –40°C to +125°C.
Technical Context
The INA181A2QDCKRQ1 uses a precision current-shunt monitor topology with integrated matched resistor gain network, enabling accurate sensing independent of supply voltage. Its differential input stage supports common-mode voltages beyond VS-up to 26V-making it suitable for both high-side (bus-voltage referenced) and low-side (ground-referenced) configurations.
It features functional safety capability with documented support for ISO 26262 system design, HBM ESD rating of ±3kV and CDM rating of ±1kV, and operates from a single 2.7V–5.5V supply while drawing ≤260µA quiescent current. The device delivers 210kHz small-signal bandwidth and maintains ±1% gain error over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V fixed-enables direct scaling of 20mV sense voltage to 1V output for ADC interfacing. |
| Common-mode range | –0.2V to 26V-supports high-side sensing on 12V/24V automotive buses without level shifting. |
| Offset voltage | ±500µV max at VCM = 12V-ensures <1% error when measuring 50mV across RSENSE at mid-range temperatures. |
| Slew rate | 2V/µs-captures fast current transients in motor phase switching or fault events. |
| Supply voltage | 2.7V to 5.5V-compatible with standard 3.3V or 5V automotive microcontroller domains. |
| Quiescent current | 260µA max-minimizes power draw in always-on vehicle subsystems like battery monitors. |
| Bandwidth | 210kHz (A2 variant)-sufficient for PWM frequencies up to ~10kHz with <1% gain error. |
| Output swing | Within 30mV of VS and 5mV of GND-maximizes dynamic range for 12-bit+ ADCs with 0–VS input range. |
Pinout & Package
INA181A2QDCKRQ1 is packaged in a 6-pin SC70 (DCK) package, measuring 2.00mm × 2.10mm, with exposed pad not electrically connected. This compact footprint supports high-density PCB layouts in space-constrained automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Analog input | Positive input of current-sense amplifier; connects to bus side of shunt in high-side, load side in low-side sensing. |
| IN− | Analog input | Negative input of current-sense amplifier; connects to load side of shunt in high-side, ground side in low-side sensing. |
| OUT | Analog output | Voltage output = GAIN × (IN+ − IN−) + VREF; drives ADC or comparator directly. |
| REF | Analog input | Bias reference for bidirectional operation; sets zero-current output level (e.g., 2.5V for ± full-scale). |
| VS | Power supply | 2.7V–5.5V analog supply; powers internal amplifier and gain network; decoupling required at pin. |
| GND | Analog ground | Reference return for all analog signals; must be low-impedance path to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | Enabled by REF pin-allows single-supply measurement of forward/reverse current without external op-amps. |
| Rail-to-rail output | Swings within 30mV of VS and 5mV of GND-preserves >98% of ADC input range for high-resolution digitization. |
| AEC-Q100 Grade 1 | Qualified for –40°C to +125°C ambient operation-meets thermal requirements for under-hood and powertrain applications. |
| Integrated gain network | Matched thin-film resistors-eliminates external gain-setting components and reduces temperature drift to 1µV/°C max. |
| Functional safety support | Documentation available per ISO 26262-reduces validation effort for ASIL-B/C system integration. |
| Low quiescent current | 260µA max-enables continuous monitoring in battery-backed systems without significant drain. |
Applications
| Motor Control | Battery Monitoring |
|---|---|
Use Scenario: Real-time phase current sensing in 3-phase BLDC motor drivers for torque control and field-oriented control (FOC). IC Role / Device Role / Timing Role: Current-shunt monitor providing isolated, high-bandwidth analog feedback to MCU ADC. Use Value: 210kHz bandwidth and 2V/µs slew rate enable accurate capture of PWM-modulated currents up to 10kHz switching frequency. | Use Scenario: Cell-level or pack-level current monitoring in 12V/48V automotive battery management systems (BMS). IC Role / Device Role / Timing Role: Bidirectional current sensor interfaced to microcontroller ADC with REF-biased zero-current point. Use Value: ±500µV offset at 12V VCM ensures <0.5% error in charge/discharge current measurement at 100mA sense voltage. |
| Power Management | Lighting Control |
Use Scenario: Input/output current supervision in DC-DC converters and power distribution units (PDUs) for overcurrent protection. IC Role / Device Role / Timing Role: High-side current monitor feeding fast comparator for sub-µs fault response. Use Value: 26V common-mode range allows direct sensing on 24V supply rails without attenuators or isolation. | Use Scenario: LED string current regulation and open-circuit detection in adaptive front-lighting systems (AFS). IC Role / Device Role / Timing Role: Low-side current monitor with REF set to mid-supply for bidirectional fault detection (short/open). Use Value: Rail-to-rail output swing maximizes signal-to-noise ratio for 12-bit ADC sampling of LED current down to 10mA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A2QDRQ1 | Higher bandwidth (400kHz), lower offset (±100µV max), wider VCM (–4V to 80V), but higher IQ (1.1mA) | Better suited for high-speed motor control or 48V systems; less optimal for ultra-low-power always-on monitoring | Select INA240A2QDRQ1 when VCM exceeds 26V or sub-100µV offset is required at cost of higher supply current. |
| MAX40056ATA+T | 50V/V gain, ±150µV offset at 0V VCM, 2.7V–5.5V supply, but only –0.1V to 26V VCM and no AEC-Q100 qualification | Lacks automotive qualification and has narrower low-end VCM; suitable for industrial/commercial designs only | Select MAX40056ATA+T for non-automotive applications where AEC-Q100 is not required and lowest offset at 0V VCM is critical. |
Compared with INA240A2QDRQ1 and MAX40056ATA+T, the INA181A2QDCKRQ1 offers the optimal balance of AEC-Q100 compliance, 26V VCM coverage, 50V/V gain accuracy, and ultra-low 260µA quiescent current-making it ideal for cost-sensitive, thermally constrained automotive current monitoring where 210kHz bandwidth suffices.
Availability
INA181A2QDCKRQ1 is available at Aetrix Electronics and suitable for motor control, battery monitoring, and power management applications requiring stable component supply across automotive production lifecycles.
Supply support for INA181A2QDCKRQ1 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-grade ICs and functional safety solutions.
The INA181-Q1 product line was designed specifically for cost-optimized, high-reliability bidirectional current sensing in automotive power systems-including motor drives, battery management, and lighting-where wide common-mode range and AEC-Q100 compliance are mandatory.
FAQ
What is the gain setting of the INA181A2QDCKRQ1?
The INA181A2QDCKRQ1 has a fixed gain of 50V/V, as indicated by the "A2" suffix in the part number. This gain is implemented using an internal matched thin-film resistor network, ensuring ±1% maximum gain error across –40°C to +125°C and eliminating the need for external gain-setting components. The 50V/V ratio scales typical 20mV shunt voltages to 1V output, optimizing compatibility with standard 12-bit ADC inputs.
Does the INA181A2QDCKRQ1 support bidirectional current sensing?
Yes, the INA181A2QDCKRQ1 supports true bidirectional current sensing via its REF pin. Applying a reference voltage (e.g., VS/2 = 2.5V) to REF establishes a zero-current output level; positive differential input produces OUT > VREF, and negative differential input produces OUT < VREF. This enables single-supply measurement of charge and discharge currents in battery systems without polarity-switching circuitry or dual supplies.
What is the common-mode input voltage range for the INA181A2QDCKRQ1?
The INA181A2QDCKRQ1 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 and low-side sensing near ground, with no level-shifting circuitry required. The –0.2V lower limit accommodates small negative transients during switching events.
Is the INA181A2QDCKRQ1 qualified for automotive use?
Yes, the INA181A2QDCKRQ1 is AEC-Q100 qualified for automotive applications (Grade 1: –40°C to +125°C ambient), with HBM ESD classification Level 2 (±3kV) and CDM Level C6 (±1kV). It also provides functional safety documentation to support ISO 26262 system-level development, making it suitable for ASIL-B and ASIL-C relevant subsystems such as motor control and battery monitoring.
What package type is used for the INA181A2QDCKRQ1?
The INA181A2QDCKRQ1 is supplied in a 6-pin SC70 package (DCK), measuring 2.00mm × 2.10mm. This compact surface-mount package supports high-density PCB layouts and is compatible with standard reflow soldering processes. Pin functions match the SOT-23 variant (DBV), with identical signal mapping: IN+, IN−, OUT, REF, VS, and GND.
INA181A2QDCKRQ1 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:
- 210 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
INA181A2QDCKRQ1 FAQ
1.How can I place an order for INA181A2QDCKRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA181A2QDCKRQ1 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 INA181A2QDCKRQ1 reliable?
The price and inventory of INA181A2QDCKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA181A2QDCKRQ1 is usually 5 days.
3.What payment methods are accepted for INA181A2QDCKRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA181A2QDCKRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA181A2QDCKRQ1?
INA181A2QDCKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA181A2QDCKRQ1 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 INA181A2QDCKRQ1?
For technical support, including INA181A2QDCKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA181A2QDCKRQ1 requirements.
6.How does Aetrix verify that INA181A2QDCKRQ1 is sourced from the original manufacturer or authorized distributors?
All INA181A2QDCKRQ1 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 INA181A2QDCKRQ1 meets industry standards.
7.What is the process for return or replacement of INA181A2QDCKRQ1?
All INA181A2QDCKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA181A2QDCKRQ1, 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 INA181A2QDCKRQ1 part is unused and in its original packaging.
Return procedure for INA181A2QDCKRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA181A2QDCKRQ1 Tags
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