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Texas Instruments INA381A3QDGSRQ1
- Part No.:
- INA381A3QDGSRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA381A3QDGSRQ1.pdf
- Description:
- IC CURRENT SENSE 1% 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:801
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Product details
Overview
INA381A3QDGSRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive current-sense amplifier with integrated overcurrent comparator, delivering 100 V/V gain, –0.2 V to +26 V common-mode input range, <150 µV max offset at 0 V CM, and 150 kHz small-signal bandwidth - used for real-time motor phase current monitoring in seat position modules and roof motor drivers.
For engineers reviewing the INA381A3QDGSRQ1 datasheet, INA381A3QDGSRQ1 pinout, INA381A3QDGSRQ1 application, or INA381A3QDGSRQ1 equivalent, key selection criteria include its 100 V/V fixed gain, open-drain ALERT with 50 mV hysteresis, transparent/latched mode control via RESET pin, and VSSOP-10 package compatibility with space-constrained automotive PCBs.
Technical Context
The INA381A3QDGSRQ1 implements a zero-drift chopper-stabilized amplifier architecture enabling <150 µV offset at 0 V common-mode and 1 µV/°C drift over –40°C to +125°C, paired with a standalone comparator that achieves <2 µs large-signal alert response time. Its input stage tolerates –0.2 V to +26 V common-mode voltage independent of 2.7–5.5 V supply rails.
This dual-function IC supports both high-side and low-side shunt sensing: the amplifier provides precision analog output (VOUT) referenced to GND, while the comparator compares CMPIN against externally set CMPREF to drive the open-drain ALERT pin - configurable for transparent or latched fault reporting without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100 V/V - sets 10 mV shunt drop → 1 V output, enabling use of 1 mΩ–5 mΩ low-loss sense resistors in 10–50 A applications |
| Common-mode range | –0.2 V to +26 V - supports direct connection to 12 V/24 V battery rails without level-shifting or attenuation networks |
| Offset voltage (max) | 150 µV at VCM = 0 V - ensures <0.15% error at 100 mV full-scale input, critical for accurate low-current detection |
| Bandwidth | 150 kHz - captures fast transients in BLDC motor commutation and short-circuit events within <7 µs rise time |
| Alert propagation delay | 400 ns typical - enables sub-microsecond overcurrent detection when CMPIN exceeds CMPREF by ≥20 mV |
| Supply current | 350 µA max - allows integration into always-on domains (e.g., body control modules) with minimal quiescent power impact |
| Hysteresis | 50 mV - prevents false triggering near threshold due to noise on VOUT or CMPIN signals |
Pinout & Package
VSSOP-10 package (3.00 mm × 3.00 mm), thermally enhanced with exposed thermal 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; differential input defines sensed current polarity |
| VOUT | Analog output | Amplified shunt voltage (100× VSENSE); rail-to-rail swing capability supports ADC interfacing |
| ALERT | Digital output | Active-low open-drain fault indicator; requires external pull-up; asserts within 400 ns of overthreshold event |
| RESET | Digital input | Configures alert mode: low = transparent (auto-clear), high = latched (requires manual reset) |
| CMPIN | Analog input | Comparator input; typically tied to VOUT or attenuated VOUT to set overcurrent threshold |
| CMPREF | Analog input | Comparator reference; driven by external voltage divider or precision reference (e.g., REF3140) |
| VS+ | Supply | 2.7–5.5 V single supply; powers both amplifier and comparator; decoupling capacitor required |
| GND | Ground | Reference for all analog/digital signals; thermal pad must be soldered to PCB ground plane |
| NC | No connect | Not internally bonded; may be left floating, grounded, or tied to VS+ per layout requirements |
Key Features
| Feature | Design Value |
|---|---|
| Integrated comparator with hysteresis | 50 mV built-in hysteresis eliminates noise-induced chatter on ALERT during threshold crossings |
| Zero-drift amplifier topology | 1 µV/°C max offset drift ensures stable calibration across –40°C to +125°C automotive ambient range |
| Wide common-mode tolerance | Operates with inputs at –0.2 V (reverse-battery capable) to +26 V, eliminating need for external protection or attenuation |
| Configurable alert modes | Transparent mode enables real-time interrupt-driven response; latched mode guarantees fault capture in polled systems |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C operation with robust ESD (±3 kV HBM) and thermal performance (RθJA = 188.6°C/W) |
Applications
| Seat Position & Fold Module | Roof Motor Module |
|---|---|
Use Scenario: Real-time monitoring of DC motor current during seat recline/fore-aft movement to detect mechanical binding or obstruction. IC Role / Device Role / Timing Role: Current-sense amplifier delivers analog feedback to MCU ADC; integrated comparator triggers immediate hardware interrupt on stall condition. Use Value: Enables <10 µs total system overcurrent response time, preventing actuator damage before thermal shutdown occurs. |
Use Scenario: Detecting jammed sunroof or convertible top motors during automatic close cycles using shunt-based current profiling. IC Role / Device Role / Timing Role: Amplifier outputs scaled VSENSE to MCU for closed-loop speed control; comparator generates latched ALERT for diagnostic logging. Use Value: 100 V/V gain allows use of 2 mΩ shunt, reducing power loss by >60% versus 10 mΩ alternatives while maintaining 0.5 A resolution. |
| Body Control Module (BCM) | ADAS Domain Controller |
Use Scenario: Monitoring power distribution to door lock actuators, window lifters, and mirror controls to enforce current limits and log fault events. IC Role / Device Role / Timing Role: Provides isolated current measurement on 12 V bus branches; ALERT pin directly interfaces with BCM microcontroller GPIO. Use Value: –0.2 V to +26 V common-mode range accommodates load-dump transients up to +25 V without signal distortion or latch-up. |
Use Scenario: Protecting high-power camera or radar power supplies from short circuits during cold cranking or load dump conditions. IC Role / Device Role / Timing Role: Senses current on 5 V/12 V auxiliary rails; comparator's 400 ns propagation delay enables faster response than software-based monitoring. Use Value: Integrated hysteresis prevents false alerts during PWM switching noise, improving system reliability in EMI-heavy ADAS environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sensing amplifier with comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A3QDRQ1 | 100 V/V gain, wider –4 V to +80 V common-mode range, higher 350 kHz bandwidth, but no integrated comparator | Requires external comparator and hysteresis circuitry for overcurrent detection | Choose when ultra-high common-mode tolerance (>26 V) is needed and board space permits discrete comparator implementation |
| MAX40056ATA+T | 100 V/V gain, 2.7–5.5 V supply, integrated comparator with 25 mV hysteresis, but only –0.1 V to +28 V common-mode and no AEC-Q100 Grade 1 rating | Lacks automotive qualification; limited to industrial or commercial temperature range (–40°C to +125°C not validated) | Consider for non-automotive applications requiring identical gain and smaller hysteresis, where functional safety compliance is not required |
Compared with INA240A3QDRQ1 and MAX40056ATA+T, the INA381A3QDGSRQ1 uniquely combines AEC-Q100 Grade 1 qualification, integrated comparator with 50 mV hysteresis, and guaranteed 150 µV offset at 0 V common-mode - making it optimal for space-constrained, safety-critical automotive motor protection where BOM count and validation effort must be minimized.
Availability
INA381A3QDGSRQ1 is available at Aetrix Electronics and suitable for automotive body electronics, ADAS power management, and electric seat actuation systems requiring stable component supply across extended production lifecycles.
Supply support for INA381A3QDGSRQ1 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 solutions.
The INA381-Q1 product line delivers integrated current-sense amplifiers with onboard comparators specifically designed for automotive overcurrent protection in motor control, battery management, and domain controller subsystems.
FAQ
What is the maximum common-mode voltage the INA381A3QDGSRQ1 can handle?
The INA381A3QDGSRQ1 supports a common-mode input voltage range of –0.2 V to +26 V, independent of its 2.7–5.5 V supply voltage. This allows direct connection to 12 V or 24 V automotive battery rails without external attenuation or level-shifting circuitry, and survives reverse-battery conditions down to –0.2 V.
How does the RESET pin configure alert behavior in the INA381A3QDGSRQ1?
The RESET pin on the INA381A3QDGSRQ1 selects between two alert modes: pulling RESET low enables transparent mode (ALERT follows input state in real time), while pulling RESET high activates latched mode (ALERT remains asserted until manually cleared). This eliminates need for external latch logic in systems with infrequent polling intervals.
What is the typical propagation delay of the comparator in the INA381A3QDGSRQ1?
The comparator in the INA381A3QDGSRQ1 has a typical propagation delay of 400 ns when CMPIN is overdriven by 20 mV relative to CMPREF. Total system overcurrent response time - including amplifier settling and comparator decision - is less than 10 µs, enabling rapid fault isolation in motor drive and power supply protection applications.
Can the INA381A3QDGSRQ1 be used for both high-side and low-side current sensing?
Yes, the INA381A3QDGSRQ1 supports both configurations: its –0.2 V to +26 V common-mode range permits high-side sensing on battery rails, while its low 150 µV offset at 0 V common-mode enables accurate low-side sensing near ground. The device maintains specified accuracy regardless of shunt placement, simplifying PCB layout across diverse automotive subsystems.
What is the gain error specification for the INA381A3QDGSRQ1 at 25°C?
The INA381A3QDGSRQ1 has a maximum gain error of ±1% at 25°C, with a drift of 20 ppm/°C over –40°C to +125°C. This tight gain tolerance ensures consistent current measurement scaling across temperature, reducing calibration burden in production and enabling reliable fault threshold setting in safety-critical automotive functions.
INA381A3QDGSRQ1 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
INA381A3QDGSRQ1 FAQ
1.How can I place an order for INA381A3QDGSRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA381A3QDGSRQ1 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 INA381A3QDGSRQ1 reliable?
The price and inventory of INA381A3QDGSRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA381A3QDGSRQ1 is usually 5 days.
3.What payment methods are accepted for INA381A3QDGSRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA381A3QDGSRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA381A3QDGSRQ1?
INA381A3QDGSRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA381A3QDGSRQ1 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 INA381A3QDGSRQ1?
For technical support, including INA381A3QDGSRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA381A3QDGSRQ1 requirements.
6.How does Aetrix verify that INA381A3QDGSRQ1 is sourced from the original manufacturer or authorized distributors?
All INA381A3QDGSRQ1 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 INA381A3QDGSRQ1 meets industry standards.
7.What is the process for return or replacement of INA381A3QDGSRQ1?
All INA381A3QDGSRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA381A3QDGSRQ1, 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 INA381A3QDGSRQ1 part is unused and in its original packaging.
Return procedure for INA381A3QDGSRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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