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Texas Instruments INA181A4QDBVRQ1
- Part No.:
- INA181A4QDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
INA181A4QDBVRQ1.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:11,568
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Product details
Overview
INA181A4QDBVRQ1 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 200V/V fixed gain, –0.2V to 26V input common-mode range, ±500µV max offset at 12V VCM, 105kHz bandwidth, and 2V/µs slew rate - enabling precise motor phase current sensing in 12V/24V automotive power stages.
For engineers reviewing the INA181A4QDBVRQ1 datasheet, INA181A4QDBVRQ1 pinout, INA181A4QDBVRQ1 application, or INA181A4QDBVRQ1 equivalent, this page delivers verified specifications, validated pin functions, automotive-grade thermal and ESD performance data, and real-world implementation context for battery management, motor control, and power rail monitoring systems.
Technical Context
The INA181A4QDBVRQ1 employs a precision current-shunt monitor architecture with integrated matched resistor gain network (200V/V), enabling accurate RTI voltage measurement across sense resistors independent of supply voltage. Its proprietary topology supports common-mode voltages up to 26V while operating from a 2.7V–5.5V single supply.
It delivers rail-to-rail output swing (within 30mV of VS and 5mV of GND), 1µV/°C max offset drift, ±1% max gain error over –40°C to +125°C, and functional safety documentation support - making it suitable for ASIL-B–aligned subsystems requiring deterministic current feedback under transient bus conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200V/V fixed - enables high-resolution sensing of sub-10mV shunt drops (e.g., 5mV → 1V output), reducing I²R loss in low-resistance (<1mΩ) current paths. |
| Common-mode range | –0.2V to 26V - supports direct connection to 24V battery rails or post-boost converter outputs without level-shifting or attenuation networks. |
| Offset voltage | ±500µV max at VCM = 12V - ensures ≤0.5% full-scale error when measuring 250mA through 2mΩ shunt (500µV drop), critical for battery charge/discharge accuracy. |
| Bandwidth | 105kHz - captures fast transients in BLDC motor commutation (e.g., 10kHz PWM with 5× harmonic content) without phase lag-induced control instability. |
| Quiescent current | 260µA max - allows continuous monitoring in always-on vehicle domains (e.g., 12V accessory bus) with <3.3µW total dissipation at 5V supply. |
| Slew rate | 2V/µs - maintains fidelity during rapid load steps (e.g., solenoid actuation), preventing output clipping that would corrupt fault detection thresholds. |
| ESD rating | HBM ±3kV, CDM ±1kV - meets automotive manufacturing handling requirements per AEC-Q100 Rev H, reducing field failure risk from assembly-line static discharge. |
Pinout & Package
The INA181A4QDBVRQ1 is packaged in a 6-pin SOT-23 (DBV) footprint measuring 2.90mm × 2.80mm, 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 referenced to GND; swings rail-to-rail (GND +5mV to VS –30mV) to maximize dynamic range into ADC or comparator inputs. |
| GND (Pin 2) | Analog ground | Primary reference node for internal circuitry and output stage; must be connected to low-impedance system ground plane to maintain CMRR >84dB. |
| IN+ (Pin 3) | Current-sense positive input | Connects to high-potential side of shunt: bus-voltage side in high-side sensing, load side in low-side sensing - defines current direction polarity. |
| IN– (Pin 4) | Current-sense negative input | Connects to low-potential side of shunt: load side in high-side sensing, ground side in low-side sensing - differential input pair rejects common-mode noise. |
| REF (Pin 5) | Reference input | DC bias point for bidirectional operation; 0V–VS range sets output mid-point (e.g., 2.5V ref yields ±2.5V output swing for ±12.5mA through 10mΩ shunt). |
| VS (Pin 6) | Power supply | 2.7V–5.5V analog supply; decoupling with 0.1µF ceramic capacitor at package pin is mandatory to suppress PSRR degradation above 10kHz. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | REF pin enables symmetric ± output swing around user-defined DC bias - eliminates need for dual-supply op-amps in battery charge/discharge monitoring. |
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient) and HBM/CDM ESD certified - qualified for engine bay, transmission, and ADAS power modules without derating. |
| Wide VCM independence | Operates with input common-mode up to 26V while powered from 3.3V or 5V - removes requirement for isolated supplies or resistive dividers in 12V/24V systems. |
| Matched gain network | On-die 200V/V resistor ratio trimmed to ±1% error - eliminates external gain-setting components and temperature-induced drift in production assemblies. |
| Rail-to-rail output | Output drives within 5mV of GND and 30mV of VS - maximizes usable ADC range (e.g., 12-bit 3.3V ADC gains 4090 codes instead of 4020 with 200mV headroom). |
Applications
| Motor Control | Battery Monitoring |
|---|---|
Use Scenario: Real-time phase current measurement in 3-phase BLDC traction inverters for electric power steering (EPS) and HVAC compressors. IC Role / Device Role / Timing Role: High-side current-sense amplifier interfacing between 24V battery rail and IGBT gate drivers, providing analog feedback to MCU ADC at 100ksps. Use Value: 105kHz bandwidth resolves PWM harmonics up to 5th order; ±500µV offset ensures <1% error at stall current (e.g., 100A × 1mΩ = 100mV), improving torque linearity and thermal protection accuracy. | Use Scenario: Bidirectional current sensing in 12V lead-acid or LiFePO₄ starter battery management for start-stop systems and regenerative braking energy accounting. IC Role / Device Role / Timing Role: Low-side shunt monitor with REF biased at 1.65V, generating ±1.65V output proportional to charge/discharge current for coulomb counting. Use Value: 200V/V gain converts ±50mV shunt drop to ±10V full-scale output - matches industrial ADC input ranges while maintaining 12-bit resolution over ±500A range with 100µΩ shunt. |
| Power Management | Lighting Control |
Use Scenario: Overcurrent protection and load diagnostics in centralized body control modules (BCM) supplying door locks, window lifts, and seat actuators. IC Role / Device Role / Timing Role: High-side current monitor on switched 12V outputs, feeding fast comparator for <100µs fault response and MCU for logging. Use Value: 2V/µs slew rate ensures output reaches comparator threshold within 1.5µs for 3V trip level - enabling compliance with ISO 16750-2 short-circuit test pulse P5a (10ms duration). | Use Scenario: LED string current regulation in adaptive front-lighting systems (AFS) with dynamic brightness and beam pattern control. IC Role / Device Role / Timing Role: Low-side current monitor in constant-current LED driver feedback loop, interfacing with PWM dimming controller to maintain luminous flux stability. Use Value: ±1% gain error and 1µV/°C drift ensure <2% total current error over –40°C to +85°C ambient - meeting ECE R149 photometric tolerance for headlamp intensity consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A4QDRQ1 | 200V/V gain, wider VCM (–4V to 80V), higher quiescent current (1.1mA), SOIC-8 package | Supports 48V mild-hybrid systems and industrial 48V DC distribution; larger footprint limits placement near compact motor drivers | Select when monitoring >26V rails (e.g., 48V battery) or requiring enhanced overvoltage robustness beyond 26V. |
| MAX40056ATA+T | 200V/V gain, 1.1MHz bandwidth, ±150µV max offset at 12V, 8-pin TDFN package | Higher speed suits wide-bandwidth motor control (e.g., servo position loops); lacks AEC-Q100 Grade 1 certification and functional safety documentation | Select for non-automotive high-performance applications needing faster response, where automotive qualification is not required. |
Compared with INA240A4QDRQ1 and MAX40056ATA+T, the INA181A4QDBVRQ1 offers optimal balance of AEC-Q100 compliance, SOT-23 space efficiency, and 26V-system-optimized performance - making it the preferred choice for cost-sensitive, space-constrained 12V/24V automotive modules where Grade 1 operation and functional safety support are mandatory.
Availability
INA181A4QDBVRQ1 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 INA181A4QDBVRQ1 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 bidirectional current sensing in automotive power systems - targeting cost-optimized, high-reliability implementations in EPS, BCM, battery monitors, and lighting controllers.
FAQ
What is the maximum common-mode voltage supported by the INA181A4QDBVRQ1?
The INA181A4QDBVRQ1 supports a common-mode input voltage range of –0.2V to 26V. This specification is independent of the 2.7V–5.5V supply voltage, enabling direct connection to 24V battery rails or post-regulator nodes without external attenuation. The 26V upper limit is absolute - exceeding it risks permanent damage per Absolute Maximum Ratings.
Does the INA181A4QDBVRQ1 require external gain-setting resistors?
No, the INA181A4QDBVRQ1 integrates a factory-trimmed, matched resistor network for its fixed 200V/V gain. This eliminates external components, reduces board area, and ensures ±1% gain error over temperature without calibration. External resistors are neither needed nor recommended for gain configuration.
Can the INA181A4QDBVRQ1 be used for bidirectional current sensing?
Yes, the INA181A4QDBVRQ1 supports bidirectional current sensing via its REF pin. Applying a DC bias (e.g., VS/2 = 2.5V) establishes a zero-current output reference; positive differential input produces output > REF, negative differential input produces output < REF - enabling single-supply measurement of charge and discharge currents.
What is the typical bandwidth and slew rate of the INA181A4QDBVRQ1?
The INA181A4QDBVRQ1 has a small-signal bandwidth of 105kHz and a large-signal slew rate of 2V/µs. These values are specified for the A4 variant (200V/V gain) with 10pF capacitive load. Bandwidth decreases inversely with gain - A1 (20V/V) achieves 350kHz, confirming the trade-off inherent in fixed-gain current-sense amplifiers.
Is the INA181A4QDBVRQ1 qualified for automotive applications?
Yes, the INA181A4QDBVRQ1 is AEC-Q100 qualified for automotive use (Grade 1: –40°C to +125°C ambient), with HBM ±3kV and CDM ±1kV ESD ratings. It also provides functional safety documentation to support ISO 26262 ASIL-B system development - meeting core requirements for powertrain, chassis, and body electronics.
INA181A4QDBVRQ1 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:
- 105 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
INA181A4QDBVRQ1 FAQ
1.How can I place an order for INA181A4QDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA181A4QDBVRQ1 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 INA181A4QDBVRQ1 reliable?
The price and inventory of INA181A4QDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA181A4QDBVRQ1 is usually 5 days.
3.What payment methods are accepted for INA181A4QDBVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA181A4QDBVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA181A4QDBVRQ1?
INA181A4QDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA181A4QDBVRQ1 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 INA181A4QDBVRQ1?
For technical support, including INA181A4QDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA181A4QDBVRQ1 requirements.
6.How does Aetrix verify that INA181A4QDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All INA181A4QDBVRQ1 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 INA181A4QDBVRQ1 meets industry standards.
7.What is the process for return or replacement of INA181A4QDBVRQ1?
All INA181A4QDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA181A4QDBVRQ1, 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 INA181A4QDBVRQ1 part is unused and in its original packaging.
Return procedure for INA181A4QDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA181A4QDBVRQ1 Tags
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