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Texas Instruments INA281A2QDBVRQ1
- Part No.:
- INA281A2QDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
INA281A2QDBVRQ1.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:12,852
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Product details
Overview
INA281A2QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40 °C to +125 °C) unidirectional current-sense amplifier optimized for automotive high-side and low-side shunt monitoring. It delivers 50 V/V fixed gain, ±55 µV typical input offset voltage, 120 dB DC CMRR, –4 V to +110 V operational common-mode range, and 1.3 MHz bandwidth - enabling precise, fast-response current measurement in engine control units and motor actuator modules.
For engineers reviewing the INA281A2QDBVRQ1 datasheet, INA281A2QDBVRQ1 pinout, INA281A2QDBVRQ1 application, or INA281A2QDBVRQ1 equivalent, key selection criteria include its functional safety documentation support, survival voltage rating (–20 V to +120 V), 2.5 V/µs slew rate for overcurrent detection, SOT-23-5 package footprint compatibility, and guaranteed ≤±0.5% gain error across temperature.
Technical Context
The INA281A2QDBVRQ1 employs a transconductance architecture with current-feedback amplifier topology, enabling 20 µA typical input bias current at 110 V common-mode voltage and supporting operation below ground (–4 V VCM) for recirculating current sensing in half-bridge configurations. Its zero-drift input stage ensures stable offset performance across –40 °C to +125 °C.
This variant is specifically configured for 50 V/V gain, delivering 1.3 MHz bandwidth at 80 mV differential input and maintaining ≥65 dB AC CMRR at 50 kHz. It operates from 2.7 V to 20 V supply, draws 1.5 mA quiescent current, and features rail-to-rail output swing (to GND: ≤20 mV; to VS: ≤150 mV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50 V/V - fixed internal resistor ratio enables accurate scaling of 20 mV shunt drops to 1 V output, minimizing external component count |
| Common-mode range | –4 V to +110 V - supports both high-side and low-side sensing on 12 V, 24 V, and 48 V automotive rails, including negative recirculation paths |
| DC CMRR | 120 dB - rejects >99.9999% of common-mode voltage error, critical for accuracy in noisy engine bay environments |
| Input offset voltage | ±55 µV typical - enables sub-ampere resolution with 100 µΩ shunts at full temperature range |
| Bandwidth | 1.3 MHz - supports <2 µs response time for 75 A overcurrent detection on 2 mΩ shunts, meeting fast fault-clearing requirements |
| Slew rate | 2.5 V/µs - ensures faithful reproduction of transient current waveforms without distortion during load switching |
| Quiescent current | 1.5 mA - allows integration into always-on vehicle subsystems without excessive battery drain |
Pinout & Package
SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Amplified output | Delivers 50×(VIN+ – VIN−) voltage signal; rail-to-rail capable with ≤20 mV headroom to GND and ≤150 mV to VS |
| 2: GND | Analog ground reference | Return path for internal bias network and output stage; must be connected to low-impedance system ground plane |
| 3: IN+ | Positive shunt sense input | High-impedance node for connection to shunt resistor high side; 20 µA typical bias current minimizes loading error |
| 4: IN− | Negative shunt sense input | High-impedance node for connection to shunt resistor low side; matched bias current ensures minimal common-mode-induced offset |
| 5: VS | Power supply | Accepts 2.7 V to 20 V single supply; decoupling capacitor required within 1 cm for stability and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use from –40 °C to +125 °C ambient, including thermal cycling and humidity testing per JESD22 |
| Functional safety documentation | TI provides FIT rate data, failure mode analysis, and safety manual to support ISO 26262 ASIL-B system design |
| Survival voltage rating | Withstands –20 V to +120 V common-mode transients without latch-up or parametric shift, exceeding ISO 7637-2 pulse 5a |
| Low input bias current | 20 µA typical at 110 V VCM - reduces measurement error on high-value shunts and enables use with low-power microcontrollers |
| Zero-drift architecture | ±0.1 µV/°C typical offset drift - maintains calibration integrity across engine warm-up/cool-down cycles without periodic nulling |
| Unidirectional operation | Optimized for sourcing current only (power supply → load); eliminates need for bidirectional compensation circuitry in valve/motor control |
Applications
| Automatic Transmission Control | Automotive HVAC Compressor Module |
|---|---|
Use Scenario: Real-time monitoring of solenoid coil current during gear-shift actuation to detect open/short faults and verify engagement timing. IC Role / Device Role / Timing Role: High-side current sensor interfacing directly to 12 V battery rail; provides analog feedback to transmission control unit (TCU) MCU. Use Value: Enables <2 µs overcurrent response using 2 mΩ shunt, preventing coil burnout during stuck-valve conditions while maintaining ±0.5% gain accuracy across under-hood temperature swings. |
Use Scenario: Closed-loop regulation of brushless DC compressor motor phase current to maintain cabin cooling efficiency under varying load and ambient conditions. IC Role / Device Role / Timing Role: Low-side shunt monitor on inverter leg; outputs scaled voltage to HVAC controller ADC with minimal latency. Use Value: 120 dB DC CMRR rejects PWM switching noise from adjacent power stages, ensuring stable current readings even during 20 kHz inverter operation. |
| Gasoline & Diesel Engine Platform | Valve/Motor Actuator |
Use Scenario: Monitoring fuel injector driver current to validate pulse width modulation timing, detect clogging, and identify partial short circuits. IC Role / Device Role / Timing Role: High-side current sense on 12 V or 48 V injector supply rail; withstands –20 V load dump transients. Use Value: –4 V to +110 V common-mode range accommodates injector return paths below ground during flyback recovery, eliminating need for level-shifting circuitry. |
Use Scenario: Precision current feedback for electric power steering (EPS) assist motor or throttle body actuator to ensure torque linearity and fail-safe behavior. IC Role / Device Role / Timing Role: Unidirectional current amplifier feeding safety-critical MCU; supports diagnostic self-test via known shunt excitation. Use Value: Functional safety documentation and <±0.5% gain error enable ASIL-B compliance without external calibration, reducing BOM and validation effort. |
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 | Same 50 V/V gain, but higher 120 V/V max common-mode (–4 V to +120 V), 10x lower offset drift (±0.02 µV/°C), and integrated EMI filter | Better suited for 48 V mild-hybrid systems requiring tighter long-term drift control and enhanced EMC robustness | Select when operating above 110 V common-mode or requiring <1 µV total offset drift over temperature |
| MAX40056ATA+T | 50 V/V gain, wider –5 V to +115 V common-mode, but lower 1.1 MHz bandwidth and no AEC-Q100 qualification | Targeted at industrial motor drives where automotive qualification is not mandatory but extended voltage range is needed | Choose for non-automotive 24 V/48 V systems needing similar gain and voltage range without AEC-Q100 cost premium |
Compared with INA240A2QDRQ1 and MAX40056ATA+T, the INA281A2QDBVRQ1 offers optimal balance of AEC-Q100 compliance, 1.3 MHz bandwidth, and SOT-23-5 footprint for space-constrained engine control modules - while providing sufficient accuracy for valve actuation and transmission solenoid monitoring without over-specifying drift or EMI performance.
Availability
INA281A2QDBVRQ1 is available at Aetrix Electronics and suitable for automatic transmission control, automotive HVAC compressor modules, gasoline & diesel engine platforms, and valve/motor actuator designs requiring stable component supply across automotive production lifecycles.
Supply support for INA281A2QDBVRQ1 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 precision signal conditioning and functional safety solutions.
The INA281-Q1 product line is designed specifically for high-reliability automotive current sensing - emphasizing wide common-mode operation, AEC-Q100 qualification, functional safety readiness, and robustness against load-dump and reverse-battery conditions.
FAQ
What is the maximum common-mode voltage the INA281A2QDBVRQ1 can withstand continuously?
The INA281A2QDBVRQ1 has an operational common-mode voltage range of –4 V to +110 V, meaning it functions correctly within this span during normal operation. Its survival rating extends to –20 V to +120 V, allowing it to endure automotive load-dump transients without damage or parametric shift - a critical capability verified per AEC-Q100 stress tests.
Does the INA281A2QDBVRQ1 support bidirectional current sensing?
No, the INA281A2QDBVRQ1 is a unidirectional current-sense amplifier. It is designed to measure current flowing from power supply to load only. Its internal architecture does not support negative differential input voltages; attempting to sense reverse current may result in output saturation or inaccurate readings. For bidirectional applications, TI recommends the INA229 or INA240 families.
What is the typical input offset voltage of the INA281A2QDBVRQ1, and how does it affect low-current measurement?
The INA281A2QDBVRQ1 has a typical input offset voltage of ±55 µV. When used with a 100 µΩ shunt resistor, this corresponds to ±0.55 A of equivalent current error at room temperature - enabling reliable sub-ampere resolution in engine control and actuator feedback loops where precision is essential across –40 °C to +125 °C.
Can the INA281A2QDBVRQ1 be used with a 3.3 V microcontroller ADC?
Yes. With its 50 V/V gain and 1.5 mA quiescent current, the INA281A2QDBVRQ1 outputs up to 3.3 V when driven by a 66 mV shunt drop - well within the input range of most 3.3 V ADCs. Its rail-to-rail output swing (down to GND + 20 mV) ensures full-scale utilization, and its 1.3 MHz bandwidth preserves signal fidelity for dynamic current events.
Is functional safety documentation available for the INA281A2QDBVRQ1?
Yes, Texas Instruments provides a dedicated functional safety documentation package for the INA281-Q1 family, including FIT rate calculation, failure mode effects analysis (FMEA), and a safety manual - all supporting ISO 26262 ASIL-B system-level development for automotive applications such as transmission control and EPS.
INA281A2QDBVRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2.5V/µs
- Gain Bandwidth Product:
- 1.3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 µA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 1.5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 20 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
INA281A2QDBVRQ1 FAQ
1.How can I place an order for INA281A2QDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA281A2QDBVRQ1 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 INA281A2QDBVRQ1 reliable?
The price and inventory of INA281A2QDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA281A2QDBVRQ1 is usually 5 days.
3.What payment methods are accepted for INA281A2QDBVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA281A2QDBVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA281A2QDBVRQ1?
INA281A2QDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA281A2QDBVRQ1 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 INA281A2QDBVRQ1?
For technical support, including INA281A2QDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA281A2QDBVRQ1 requirements.
6.How does Aetrix verify that INA281A2QDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All INA281A2QDBVRQ1 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 INA281A2QDBVRQ1 meets industry standards.
7.What is the process for return or replacement of INA281A2QDBVRQ1?
All INA281A2QDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA281A2QDBVRQ1, 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 INA281A2QDBVRQ1 part is unused and in its original packaging.
Return procedure for INA281A2QDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA281A2QDBVRQ1 Tags
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LM358DT
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Texas Instruments
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