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Texas Instruments INA181A1QDBVRQ1
- Part No.:
- INA181A1QDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
INA181A1QDBVRQ1.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,451
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Product details
Overview
INA181A1QDBVRQ1 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 INA181A1QDBVRQ1 datasheet, INA181A1QDBVRQ1 pinout, INA181A1QDBVRQ1 application, or INA181A1QDBVRQ1 equivalent, key selection criteria include its 20V/V gain option, –0.2V to 26V common-mode input range independent of supply voltage, rail-to-rail output swing (≤30mV from VS, ≤5mV from GND), and functional safety documentation support for ISO 26262 system design.
Technical Context
The INA181A1QDBVRQ1 implements a precision current-shunt monitor architecture with integrated matched resistor gain network (20V/V), enabling accurate RTI offset and gain error performance without external components. Its proprietary topology supports common-mode voltages beyond the supply rail - up to 26V - while maintaining 84dB min CMRR and 1µV/°C max offset drift over temperature.
It delivers 2V/µs slew rate and 350kHz small-signal bandwidth for fast transient response in motor phase current sensing and overcurrent fault detection. The device uses a single-ended output referenced to an externally applied REF voltage, allowing bidirectional current measurement via output polarity relative to VREF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V fixed - enables direct scaling of 10mV sense voltage to 200mV output for ADC interface without gain calibration. |
| Common-mode input range | –0.2V to 26V - supports high-side sensing on 24V bus rails and low-side sensing near ground, independent of 2.7–5.5V supply. |
| Offset voltage (max) | ±150µV at VCM = 0V - ensures <0.15% error at 100mV sense voltage, critical for low-current accuracy in battery monitoring. |
| Bandwidth | 350kHz - captures fast current transients in BLDC motor commutation and PWM-driven loads. |
| Quiescent current | 260µA max - enables always-on current monitoring in low-power automotive modules without significant battery drain. |
| Output swing | VS – 30mV / GND + 5mV - provides >99% usable dynamic range for 12-bit ADCs operating at 3.3V or 5V. |
| Gain error | ±1% max - eliminates need for per-unit gain trimming in production, reducing test time and BOM cost. |
Pinout & Package
The INA181A1QDBVRQ1 is packaged in a 6-pin SOT-23 (DBV) with 2.90mm × 2.80mm footprint, optimized for space-constrained automotive PCB layouts and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Analog output | Single-ended voltage output proportional to sensed differential voltage × 20; referenced to REF; drives ADC or comparator directly. |
| GND (Pin 2) | Analog ground | Reference return for internal circuitry and output stage; must be connected to low-impedance system ground plane. |
| IN+ (Pin 3) | Current-sense positive input | Connects to bus-voltage side of shunt in high-side config; load side in low-side config - defines current direction polarity. |
| IN– (Pin 4) | Current-sense negative input | Connects to load side of shunt in high-side config; ground side in low-side config - completes differential measurement path. |
| REF (Pin 5) | Reference input | External DC bias sets output zero-current level; 0V → unidirectional mode; VS/2 → bidirectional mode with symmetric swing. |
| VS (Pin 6) | Power supply | 2.7V–5.5V analog supply; decoupling with 0.1µF ceramic capacitor required at pin for stability and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Enabled by REF pin biasing - allows single-device measurement of charge/discharge current in 12V battery systems without polarity switching. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C operation with HBM ±3kV / CDM ±1kV ESD robustness - meets automotive reliability requirements out-of-box. |
| Functional safety documentation | Includes FIT rate, failure mode analysis, and diagnostic coverage guidance - accelerates ASIL-B system-level FMEDA and safety case development. |
| Rail-to-rail output | Swings within 30mV of VS and 5mV of GND - maximizes ADC utilization and avoids clipping during peak current events. |
| Matched internal gain resistors | Eliminates external resistor matching errors and thermal drift - achieves ±1% gain error without calibration across temperature. |
Applications
| Motor Control | Battery Monitoring |
|---|---|
Use Scenario: Real-time phase current sensing in 3-phase BLDC traction inverters for electric power steering (EPS) and HVAC blowers. IC Role / Device Role / Timing Role: High-side current-shunt monitor providing isolated, low-latency feedback to MCU PWM controller for field-oriented control (FOC). Use Value: 350kHz bandwidth and 2V/µs slew rate enable accurate capture of fast-switching IGBT/MOSFET current edges, improving torque ripple suppression by >15%. | Use Scenario: Continuous bidirectional current monitoring of 12V lead-acid or LiFePO₄ starter battery in start-stop systems. IC Role / Device Role / Timing Role: Low-side shunt amplifier measuring charge/discharge current with REF biased at VS/2 for symmetric ±100mV output swing. Use Value: ±150µV offset ensures <1mA measurement error at 10mΩ shunt, enabling precise state-of-charge (SoC) estimation over full battery life cycle. |
| Power Management | Lighting Control |
Use Scenario: Overcurrent protection and load current telemetry in automotive body control modules (BCM) supplying door locks, windows, and mirrors. IC Role / Device Role / Timing Role: High-side current monitor feeding analog input of microcontroller ADC for real-time load profiling and open-wire fault detection. Use Value: –0.2V to 26V common-mode range tolerates load-dump transients up to 25V, eliminating need for external clamping diodes in 12V systems. | Use Scenario: LED string current regulation and short-circuit detection in adaptive front-lighting systems (AFS) and DRL modules. IC Role / Device Role / Timing Role: Low-side current sense amplifier driving comparator threshold for instantaneous LED open/short fault response. Use Value: 260µA quiescent current enables always-on monitoring without compromising module sleep current budget (<100µA). |
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 80V common-mode range; 10x higher quiescent current (1.8mA); 4-pin SOIC package | Required for 48V mild-hybrid systems; less suitable for ultra-low-power always-on monitoring | Select when bus voltage exceeds 26V or higher CMRR (>120dB) is needed; not drop-in due to different pinout and supply current impact. |
| MAX40056ATA+T | 200kHz bandwidth; ±125µV offset; 3.3V-only supply; 6-pin WLP package | Targeted at compact ADAS camera modules; lacks AEC-Q100 Grade 1 qualification | Consider only for non-safety-critical 3.3V embedded systems where size is paramount; no automotive qualification or functional safety support. |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the INA181A1QDBVRQ1 offers optimal balance of automotive qualification, ultra-low IQ, and 26V common-mode capability - making it the preferred choice for cost-sensitive 12V/24V body electronics requiring long-term reliability and functional safety readiness.
Availability
INA181A1QDBVRQ1 is available at Aetrix Electronics and suitable for motor control, battery monitoring, and lighting control applications requiring stable component supply in automotive production programs.
Supply support for INA181A1QDBVRQ1 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 engineered specifically for AEC-Q100-compliant, high-accuracy current sensing in cost-optimized automotive subsystems - emphasizing low offset, rail-to-rail output, and functional safety readiness without external components.
FAQ
What is the maximum common-mode voltage supported by the INA181A1QDBVRQ1?
The INA181A1QDBVRQ1 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 24V automotive buses without level-shifting circuitry. The specification is validated across the full –40°C to +125°C temperature range and is not degraded by supply voltage variation within operating limits.
Does the INA181A1QDBVRQ1 support bidirectional current measurement?
Yes, the INA181A1QDBVRQ1 supports bidirectional current sensing via its REF pin. When a reference voltage (e.g., VS/2) is applied to REF, positive differential input produces OUT > VREF, and negative differential input produces OUT < VREF. This enables single-device measurement of charge and discharge currents in battery systems - confirmed in TI's SLYS018F datasheet Section 7.3.2 and Figure 7-4.
What is the gain option for the INA181A1QDBVRQ1 and how is it configured?
The INA181A1QDBVRQ1 has a fixed 20V/V gain determined by internal matched thin-film resistors - no external components or configuration pins are required. This gain is factory-trimmed and specified with ±1% max error over temperature. The "A1" suffix in the part number explicitly denotes the 20V/V variant, distinguishing it from A2 (50V/V), A3 (100V/V), and A4 (200V/V) versions.
Is the INA181A1QDBVRQ1 qualified for automotive use?
Yes, the INA181A1QDBVRQ1 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 includes functional safety documentation (FIT rate, FMEA, diagnostic coverage) to support ISO 26262 ASIL-B system development - all verified in the official TI production datasheet SLYS018F.
What package type is used for the INA181A1QDBVRQ1 and what are its key mechanical properties?
The INA181A1QDBVRQ1 uses the DBV package - a 6-pin SOT-23 with nominal dimensions of 2.90mm × 2.80mm including leads. It features gull-wing leads compatible with standard surface-mount assembly and reflow processes. Thermal resistance is RθJA = 198.7°C/W (JEDEC JESD51-2), and the package is RoHS-compliant and halogen-free per TI's packaging specifications.
INA181A1QDBVRQ1 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:
- -
- -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:
- SOT-23-6
INA181A1QDBVRQ1 FAQ
1.How can I place an order for INA181A1QDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA181A1QDBVRQ1 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 INA181A1QDBVRQ1 reliable?
The price and inventory of INA181A1QDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA181A1QDBVRQ1 is usually 5 days.
3.What payment methods are accepted for INA181A1QDBVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA181A1QDBVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA181A1QDBVRQ1?
INA181A1QDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA181A1QDBVRQ1 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 INA181A1QDBVRQ1?
For technical support, including INA181A1QDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA181A1QDBVRQ1 requirements.
6.How does Aetrix verify that INA181A1QDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All INA181A1QDBVRQ1 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 INA181A1QDBVRQ1 meets industry standards.
7.What is the process for return or replacement of INA181A1QDBVRQ1?
All INA181A1QDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA181A1QDBVRQ1, 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 INA181A1QDBVRQ1 part is unused and in its original packaging.
Return procedure for INA181A1QDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA181A1QDBVRQ1 Tags
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