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Texas Instruments INA381A1QDGSRQ1
- Part No.:
- INA381A1QDGSRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA381A1QDGSRQ1.pdf
- Description:
- IC CURRENT SENSE 1% 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,298
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Product details
Overview
INA381A1QDGSRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive current-sense amplifier with integrated overcurrent comparator, delivering 20 V/V gain, 350-kHz bandwidth, ±150 µV max offset at 0 V common-mode, and –0.2 V to +26 V input common-mode range. It operates from 2.7 V to 5.5 V supply and supports high-side/low-side sensing in body control modules and ADAS domain controllers.
For engineers reviewing the INA381A1QDGSRQ1 datasheet, INA381A1QDGSRQ1 pinout, INA381A1QDGSRQ1 application, or INA381A1QDGSRQ1 equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-chain support for automotive-grade current monitoring and fast overcurrent protection design.
Technical Context
The INA381A1QDGSRQ1 integrates a zero-drift current-sense amplifier and a standalone open-drain comparator in a single VSSOP-10 package. Its architecture enables simultaneous precision measurement (±150 µV offset at 0 V VCM) and sub-2 µs large-signal alert response, with independent operation of amplifier and comparator signal paths.
It supports transparent and latched alert modes via the RESET pin, uses external reference voltage on CMPREF to set overcurrent threshold, and maintains functional integrity across –40°C to +125°C ambient temperature with 1 µV/°C offset drift and 20 ppm/°C gain error drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V - sets output voltage = 20 × sensed differential voltage across shunt resistor |
| Bandwidth | 350 kHz - supports accurate sensing of fast-rising motor or load transients |
| Common-mode range | –0.2 V to +26 V - enables direct high-side sensing on 12 V/24 V automotive rails without level-shifting |
| Offset voltage (max) | ±150 µV at 0 V VCM - allows use of ≤1 mΩ shunt resistors while maintaining <1% error at low currents |
| Comparator hysteresis | 50 mV - prevents false triggering near threshold due to noise or ripple on VOUT or CMPIN |
| Supply voltage | 2.7 V to 5.5 V - compatible with standard 3.3 V or 5 V microcontroller domains |
| Quiescent current | 350 µA max - enables always-on current monitoring in low-power vehicle subsystems |
Pinout & Package
VSSOP-10 package (3.00 mm × 3.00 mm body), thermally enhanced with exposed pad connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Analog input | Connects to supply side of shunt resistor; accepts common-mode up to +26 V |
| IN− | Analog input | Connects to load side of shunt resistor; completes differential sense path |
| VOUT | Analog output | Amplified sense voltage (G × VSENSE); drives ADC or comparator input |
| CMPIN | Analog comparator input | Receives VOUT or scaled version; compared against CMPREF to trigger ALERT |
| CMPREF | Analog comparator reference | External voltage sets overcurrent threshold; determines trip point for ALERT assertion |
| ALERT | Digital output | Active-low open-drain output; requires external pull-up; asserts within <2 µs on overcurrent |
| RESET | Digital input | Low = transparent mode; high or floating = latched mode; controls ALERT reset behavior |
| VS+ | Power supply | 2.7 V to 5.5 V analog/digital supply; powers both amplifier and comparator |
| GND | Ground | Reference for all analog signals and thermal pad; must be low-impedance connection |
| NC | No connect | Not internally bonded; may be left floating, grounded, or tied to VS+ per layout needs |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift amplifier topology | Enables stable ±150 µV offset at 0 V VCM and only 1 µV/°C drift over –40°C to +125°C |
| Integrated comparator with hysteresis | 50 mV fixed hysteresis eliminates chatter during threshold crossing; propagation delay <400 ns |
| Wide common-mode input range | –0.2 V to +26 V independent of VS enables direct high-side sensing on 12 V/24 V battery rails |
| Configurable alert output mode | Transparent (RESET = low) or latched (RESET = high/floating) behavior supports interrupt-driven or polled system architectures |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with full functional safety documentation support |
Applications
| ADAS Domain Controller | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Real-time monitoring of power distribution to radar, camera, and ECU clusters under varying load conditions. IC Role / Device Role / Timing Role: Current-sense amplifier measures shunt voltage; comparator triggers immediate fault shutdown before thermal damage occurs. Use Value: Sub-10 µs total overcurrent response time protects high-value ADAS sensors and avoids system-level brownout cascades. |
Use Scenario: Overcurrent detection for window lift motors, seat position actuators, and interior lighting drivers. IC Role / Device Role / Timing Role: High-side sensing on 12 V supply rail; ALERT output directly interfaces with MCU GPIO interrupt pins. Use Value: 20 V/V gain and ±150 µV offset enable reliable detection of 50 mA faults using 10 mΩ shunts, minimizing power loss. |
| Roof Motor Module | Seat Position & Fold Module |
|
Use Scenario: Monitoring bidirectional current in sunroof or panoramic roof actuator circuits with reverse polarity tolerance. IC Role / Device Role / Timing Role: Supports –0.2 V common-mode input to handle negative transients during motor commutation. Use Value: Zero-drift architecture ensures consistent trip thresholds across temperature swings during extended vehicle exposure. |
Use Scenario: Detecting stalled motor conditions in multi-axis seat adjustment systems with dual-direction current flow. IC Role / Device Role / Timing Role: Latched alert mode retains fault state between MCU polling cycles, preventing missed events in low-duty-cycle systems. Use Value: Integrated comparator eliminates need for external comparator and reference, reducing BOM count and PCB area by 30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier with comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | 20 V/V gain, 4 V/V to 500 V/V programmable via external resistors; no integrated comparator; 8-pin SOIC | Requires external comparator and reference circuit for overcurrent detection; higher design overhead | Select when higher gain flexibility is needed and board space permits discrete comparator implementation |
| MAX40056ATA+T | 20 V/V gain, 400 kHz bandwidth, 1.5 µV/°C offset drift; integrated comparator with 25 mV hysteresis; 8-pin TDFN | Lower hysteresis reduces noise immunity; smaller 3 mm × 3 mm TDFN package lacks thermal pad | Select for space-constrained designs where 25 mV hysteresis suffices and thermal performance is secondary |
Compared with INA240A1QDRQ1 and MAX40056ATA+T, the INA381A1QDGSRQ1 uniquely combines AEC-Q100 Grade 1 qualification, 50 mV comparator hysteresis, and VSSOP-10 thermal pad in a single-package solution-enabling faster fault response, lower system-level BOM cost, and robust automotive thermal reliability.
Availability
INA381A1QDGSRQ1 is available at Aetrix Electronics and suitable for ADAS domain controllers, body control modules, and seat position & fold modules requiring stable component supply across automotive production lifecycles.
Supply support for INA381A1QDGSRQ1 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 INA381-Q1 product line delivers integrated current-sense amplifiers with onboard comparators for automotive overcurrent protection-designed specifically for high-reliability, high-accuracy sensing in body electronics, ADAS, and electrified powertrain subsystems.
FAQ
What is the maximum common-mode voltage supported by the INA381A1QDGSRQ1?
The INA381A1QDGSRQ1 supports a common-mode input voltage range from –0.2 V to +26 V, independent of its 2.7 V to 5.5 V supply voltage. This allows direct high-side sensing on 12 V or 24 V automotive battery rails without external level-shifting circuitry. The device remains functional and undamaged even when the full 26 V common-mode voltage is applied with VS removed.
How does the RESET pin configure alert behavior in the INA381A1QDGSRQ1?
In the INA381A1QDGSRQ1, pulling the RESET pin low configures transparent alert mode-where ALERT follows the input state in real time. Leaving RESET high or floating enables latched mode-where ALERT stays asserted until manually cleared. This dual-mode capability supports both interrupt-driven and polled system architectures without external logic.
What is the typical total overcurrent response time of the INA381A1QDGSRQ1?
The total system overcurrent protection response time provided by the INA381A1QDGSRQ1 is less than 10 µs. This includes amplifier settling, comparator propagation (<400 ns typical), and hysteresis recovery-enabling rapid fault isolation in motor drivers and power distribution units before thermal damage occurs.
Can the INA381A1QDGSRQ1 be used for low-side current sensing?
Yes, the INA381A1QDGSRQ1 supports low-side current sensing with ±150 µV maximum offset voltage at 0 V common-mode. Its zero-drift architecture ensures stable accuracy across temperature, enabling precise measurement of small shunt voltages-ideal for efficiency-critical applications using ≤1 mΩ resistors in BCM or seat modules.
What is the purpose of the NC pin on the INA381A1QDGSRQ1 VSSOP-10 package?
The NC (No Connect) pin on the INA381A1QDGSRQ1 is not internally bonded and serves no electrical function. It may be left floating, grounded, or connected to VS+ depending on PCB layout requirements-such as improving thermal conduction or reducing crosstalk-without affecting device operation or specifications.
INA381A1QDGSRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current Sense
- Sensing Method:
- High/Low-Side
- Accuracy:
- ±1%
- Voltage - Input:
- 0V ~ 26V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VSSOP
INA381A1QDGSRQ1 FAQ
1.How can I place an order for INA381A1QDGSRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA381A1QDGSRQ1 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 INA381A1QDGSRQ1 reliable?
The price and inventory of INA381A1QDGSRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA381A1QDGSRQ1 is usually 5 days.
3.What payment methods are accepted for INA381A1QDGSRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA381A1QDGSRQ1 transactions.
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4.How is shipping managed for INA381A1QDGSRQ1?
INA381A1QDGSRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA381A1QDGSRQ1 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 INA381A1QDGSRQ1?
For technical support, including INA381A1QDGSRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA381A1QDGSRQ1 requirements.
6.How does Aetrix verify that INA381A1QDGSRQ1 is sourced from the original manufacturer or authorized distributors?
All INA381A1QDGSRQ1 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 INA381A1QDGSRQ1 meets industry standards.
7.What is the process for return or replacement of INA381A1QDGSRQ1?
All INA381A1QDGSRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA381A1QDGSRQ1, 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 INA381A1QDGSRQ1 part is unused and in its original packaging.
Return procedure for INA381A1QDGSRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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