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Texas Instruments INA181A2QDBVRQ1
- Part No.:
- INA181A2QDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
INA181A2QDBVRQ1.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:10,601
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Product details
Overview
INA181A2QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive current-sense amplifier optimized for bidirectional, high-accuracy shunt-based current monitoring in both low-side and high-side configurations. It features 50V/V fixed gain, –0.2V to 26V input common-mode range, ±500µV max offset at 12V VCM, 210kHz bandwidth, and 2V/µs slew rate - enabling precise motor phase current sensing in 12V/24V battery-powered traction inverters.
For engineers reviewing the INA181A2QDBVRQ1 datasheet, INA181A2QDBVRQ1 pinout, INA181A2QDBVRQ1 application, or INA181A2QDBVRQ1 equivalent, key selection criteria include bidirectional sensing capability, rail-to-rail output swing (≤5mV above GND, ≤30mV below VS), functional safety documentation support, ±1% max gain error over –40°C to +125°C, and SOT-23-6 packaging for space-constrained power stage layouts.
Technical Context
The INA181A2QDBVRQ1 employs a precision current-shunt monitor architecture with integrated matched resistor gain network, enabling accurate RTI (referred-to-input) measurement independent of supply voltage. Its differential input stage supports operation with common-mode voltages exceeding VS by up to 20.5V - critical for high-side sensing in automotive 12V/24V systems where bus transients exceed 5.5V supply rails.
Functional safety capability is implemented via documented failure modes, FIT rates, and diagnostic coverage guidance aligned with ISO 26262 ASIL-B development requirements. The device operates from 2.7V–5.5V supply, draws ≤260µA quiescent current, and delivers rail-to-rail output swing with 1µV/°C max offset drift - ensuring stable performance across engine bay thermal cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50V/V fixed - enables 20mV full-scale shunt voltage to produce 1V output, simplifying ADC interface without external scaling. |
| Common-mode range | –0.2V to 26V - supports direct connection to battery rail or post-DC-link nodes without level-shifting, even during load-dump transients. |
| Offset voltage | ±500µV max at VCM = 12V - ensures <0.5% error at 10mV sense voltage, critical for low-current fault detection in battery management. |
| Bandwidth | 210kHz - captures fast current transients in BLDC motor commutation (e.g., 10kHz PWM with 5x harmonic content). |
| Slew rate | 2V/µs - prevents output saturation during step-load changes in solenoid drivers or e-fuse response circuits. |
| Supply current | 260µA max - enables always-on current monitoring in low-power wake-up domains without compromising battery standby life. |
| Output swing | Within 5mV of GND and 30mV of VS - maximizes dynamic range for 12-bit ADCs operating on 3.3V or 5V rails. |
Pinout & Package
INA181A2QDBVRQ1 is packaged in a 6-pin SOT-23 (DBV) footprint measuring 2.90mm × 2.80mm, suitable for automated placement in compact power modules and PCBs with tight thermal constraints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Analog output | Single-ended voltage output proportional to sensed current × 50V/V; drives ADC inputs or comparator thresholds directly. |
| 2: GND | Analog ground | Reference return for internal circuitry; must be connected to low-impedance analog ground plane near sense resistor. |
| 3: IN+ | Positive input | Connect to high-potential side of shunt: bus-voltage side in high-side sensing, load side in low-side sensing. |
| 4: IN– | Negative input | Connect to low-potential side of shunt: load side in high-side sensing, ground side in low-side sensing. |
| 5: REF | Reference input | Bias point for bidirectional operation; 0V–VS range sets zero-current output level (e.g., 2.5V for ±100A range). |
| 6: VS | Power supply | 2.7V–5.5V analog supply; bypass with 0.1µF ceramic capacitor placed within 2mm of pin per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±3kV / CDM ±1kV ESD robustness - meets automotive module reliability requirements. |
| Bidirectional sensing | Enabled by REF pin biasing - eliminates need for dual amplifiers or external op-amp summing networks in regenerative braking or battery charge/discharge monitoring. |
| Rail-to-rail output | Swings to within 5mV of GND and 30mV of VS - preserves >98% of ADC full-scale range when using 3.3V supplies, improving resolution by ≥1 LSB vs limited-swing alternatives. |
| Matched internal gain resistors | Minimizes gain error to ±1% max and temperature drift to 20ppm/°C - removes calibration burden in production test for cost-sensitive ECUs. |
| Functional safety documentation | Includes FIT rate, failure mode analysis, and diagnostic coverage guidance - accelerates ISO 26262 ASIL-B hardware integration without third-party safety audits. |
Applications
| Motor Control | Battery Monitoring |
|---|---|
Use Scenario: Real-time phase current feedback in 3-phase inverter driving 48V mild-hybrid starter-generator. IC Role / Device Role / Timing Role: High-side current-sense amplifier interfacing between 48V DC-link and MCU ADC, sampling at 100ksps. Use Value: 210kHz bandwidth resolves PWM edge harmonics; ±500µV offset enables <1A detection threshold at 2mΩ shunt, supporting torque ripple reduction. |
Use Scenario: Cell-level current monitoring in 12S Li-ion battery pack with active balancing. IC Role / Device Role / Timing Role: Bidirectional shunt amplifier measuring charge/discharge current per string, referenced to mid-rail for symmetric output swing. Use Value: –0.2V to 26V common-mode range accommodates full pack voltage swing; 260µA IQ extends sleep-mode runtime between balance cycles. |
| Power Management | Lighting Control |
Use Scenario: Overcurrent protection in 12V vehicle body control module supplying multiple loads. IC Role / Device Role / Timing Role: Low-side current monitor feeding fast comparator for sub-10µs trip response during short-circuit events. Use Value: 2V/µs slew rate ensures output reaches comparator threshold before MOSFET thermal runaway; ±1% gain error enables precise trip-point setting. |
Use Scenario: LED driver current regulation in adaptive front-lighting system (AFS) with dynamic beam shaping. IC Role / Device Role / Timing Role: High-side sense amplifier providing feedback to current-mode PWM controller for 0.5–5A LED strings. Use Value: 26V common-mode rating survives load-dump transients; rail-to-rail output maintains linearity across full dimming range (0.1%–100%). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA181A1QDBVRQ1 | 20V/V gain (vs. 50V/V); same package, offset, and bandwidth specs | Better suited for higher shunt voltages (>50mV FS) or lower-resolution ADCs requiring larger output swing per mA | Select when sensing 50mΩ+ shunts or when system gain budget requires lower amplification before ADC. |
| INA240A2QDRQ1 | Higher bandwidth (400kHz), wider common-mode (–4V to 80V), but larger SOIC-8 package and 1.1mA IQ | Required for 48V/60V systems with aggressive transient immunity needs or where PCB area allows larger footprint | Choose for next-gen 48V architectures needing extended voltage margin or faster transient response, accepting higher power and size cost. |
Compared with INA181A1QDBVRQ1 and INA240A2QDRQ1, the INA181A2QDBVRQ1 offers optimal trade-off of gain, size, and power for mainstream 12V/24V automotive current sensing - delivering 50× amplification in SOT-23-6 with 260µA IQ, whereas A1 sacrifices gain for headroom and A2QDRQ1 trades size/power for voltage/headroom scalability.
Availability
INA181A2QDBVRQ1 is available at Aetrix Electronics and suitable for motor control, battery monitoring, and lighting control applications requiring stable component supply across automotive production lifecycles.
Supply support for INA181A2QDBVRQ1 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 INA181-Q1 product line was designed specifically for AEC-Q100-compliant, cost-optimized current sensing in automotive powertrain, chassis, and body electronics - emphasizing precision, thermal stability, and functional safety readiness.
FAQ
What is the maximum common-mode voltage the INA181A2QDBVRQ1 can handle?
The INA181A2QDBVRQ1 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 battery rails in high-side configurations without external level-shifting circuitry, and remains fully operational during ISO 7637-2 load-dump transients up to 26V.
Does the INA181A2QDBVRQ1 support bidirectional current sensing?
Yes, the INA181A2QDBVRQ1 supports true bidirectional current sensing via its REF pin. Applying a reference voltage (e.g., VS/2 = 2.5V) establishes a zero-current output level; positive differential input produces OUT > VREF, while negative differential input produces OUT < VREF - enabling single-supply measurement of charge and discharge currents in battery systems.
What is the typical bandwidth and slew rate of the INA181A2QDBVRQ1?
The INA181A2QDBVRQ1 has a small-signal bandwidth of 210kHz and a large-signal slew rate of 2V/µs. These specifications enable accurate capture of fast current transients in BLDC motor control (e.g., 10kHz PWM with 5th harmonic content) and rapid fault detection in overcurrent protection circuits without output distortion or delay.
How does the gain option of the INA181A2QDBVRQ1 affect system design?
The INA181A2QDBVRQ1's fixed 50V/V gain determines shunt resistor selection and ADC interface requirements. For example, with a 2mΩ shunt and 100A max current, the sense voltage is 200mV - amplified to 10V output, requiring either attenuation or a 12V-tolerant ADC input. This gain optimizes resolution for mid-range shunt values (1–5mΩ) in 12V/24V systems.
Is the INA181A2QDBVRQ1 qualified for automotive applications?
Yes, the INA181A2QDBVRQ1 is AEC-Q100 qualified for automotive applications (Grade 1: –40°C to +125°C ambient), with HBM ±3kV and CDM ±1kV ESD ratings. It also provides functional safety documentation - including FIT rate, failure mode analysis, and diagnostic coverage guidance - to support ISO 26262 ASIL-B hardware development.
INA181A2QDBVRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- 210 kHz
- -3db Bandwidth:
- -
- 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:
- SOT-23-6
INA181A2QDBVRQ1 FAQ
1.How can I place an order for INA181A2QDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA181A2QDBVRQ1 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 INA181A2QDBVRQ1 reliable?
The price and inventory of INA181A2QDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA181A2QDBVRQ1 is usually 5 days.
3.What payment methods are accepted for INA181A2QDBVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA181A2QDBVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA181A2QDBVRQ1?
INA181A2QDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA181A2QDBVRQ1 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 INA181A2QDBVRQ1?
For technical support, including INA181A2QDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA181A2QDBVRQ1 requirements.
6.How does Aetrix verify that INA181A2QDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All INA181A2QDBVRQ1 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 INA181A2QDBVRQ1 meets industry standards.
7.What is the process for return or replacement of INA181A2QDBVRQ1?
All INA181A2QDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA181A2QDBVRQ1, 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 INA181A2QDBVRQ1 part is unused and in its original packaging.
Return procedure for INA181A2QDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA181A2QDBVRQ1 Tags
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Microchip Technology
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