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Texas Instruments INA381A4QDGSRQ1
- Part No.:
- INA381A4QDGSRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA381A4QDGSRQ1.pdf
- Description:
- IC CURRENT SENSE 1% 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,234
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Product details
Overview
INA381A4QDGSRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive current-sense amplifier with integrated overcurrent comparator, configured for 200 V/V gain, –0.2 V to +26 V common-mode input range, <150 µV max offset at 0 V CM, and 105 kHz small-signal bandwidth - used in high-side/low-side motor current monitoring and fault protection in body control modules.
For engineers reviewing the INA381A4QDGSRQ1 datasheet, INA381A4QDGSRQ1 pinout, INA381A4QDGSRQ1 application, or INA381A4QDGSRQ1 equivalent, this page delivers verified functional safety-capable specifications, VSSOP-10 package layout, transparent/latched alert modes, and automotive-grade thermal performance (–40°C to +125°C) without extrapolation or generic claims.
Technical Context
The INA381A4QDGSRQ1 implements a zero-drift chopper-stabilized amplifier topology enabling <150 µV offset at 0 V common-mode and 1 µV/°C drift, paired with a standalone comparator featuring 50 mV hysteresis and 400 ns typical propagation delay. Its input stage tolerates –0.2 V to +26 V common-mode voltage independent of 2.7–5.5 V supply rails.
It supports both high-side and low-side sensing via differential IN+/IN– inputs, delivers 200× fixed gain with ±1% max gain error at 25°C, and provides open-drain ALERT output configurable in transparent or latched mode via RESET pin - enabling sub-10 µs total overcurrent response time including amplifier and comparator latency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200 V/V - sets 5 mV full-scale shunt voltage to 1 V output, enabling precise low-value shunt use (e.g., 1 mΩ at 1 A = 1 mV input → 200 mV output). |
| Common-mode range | –0.2 V to +26 V - allows direct high-side sensing on 12 V/24 V battery rails without level-shifting or supply dependency. |
| Offset voltage (max) | 150 µV at VCM = 0 V - enables accurate sub-100 mA current detection with 10 mΩ shunt (100 mA × 10 mΩ = 1 mV input). |
| Bandwidth | 105 kHz - supports fast transient detection in BLDC motor commutation and short-circuit events in automotive loads. |
| Comparator hysteresis | 50 mV - prevents false triggering near threshold due to noise, ensuring stable alert assertion/deassertion in noisy vehicle environments. |
| Supply current | 350 µA max - minimizes power draw in always-on domains like telematics control units and digital cockpits. |
| Operating temperature | –40°C to +125°C ambient - meets AEC-Q100 Grade 1 requirements for under-hood and cabin electronics placement. |
Pinout & Package
VSSOP-10 package (3.00 mm × 3.00 mm body), thermally enhanced with exposed pad connected to GND per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Analog input | Connects to supply side of shunt resistor; accepts –0.2 V to +26 V common-mode voltage. |
| IN– | Analog input | Connects to load side of shunt resistor; completes differential sense path with IN+. |
| VOUT | Analog output | Amplified sense voltage (G × VSENSE); rail-to-rail swing capability supports ADC interfacing. |
| ALERT | Digital output | Active-low open-drain output; requires external pullup; asserts within <10 µs of overcurrent event. |
| RESET | Digital input | Configures alert mode: low = transparent, high = latched; enables microcontroller-driven fault recovery. |
| CMPIN | Analog input | Comparator input; typically tied to VOUT or attenuated version for threshold comparison. |
| CMPREF | Analog input | Comparator reference voltage; set by resistor divider or external reference (e.g., REF3140) for programmable trip point. |
| VS+ | Supply | 2.7 V to 5.5 V single supply; powers both amplifier and comparator; decoupling required per layout guide. |
| GND | Ground | Device ground and thermal pad connection point; must be low-impedance system ground plane. |
| NC | No connect | Not internally bonded; may be left floating, grounded, or tied to VS+ per board routing needs. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift amplifier architecture | Enables <150 µV max offset at 0 V CM and 1 µV/°C drift - critical for stable current measurement across automotive temperature extremes. |
| Integrated comparator with hysteresis | 50 mV hysteresis and 400 ns typical propagation delay - eliminates need for external comparator and reduces BOM count in overcurrent protection circuits. |
| Configurable alert output mode | Transparent (RESET = low) or latched (RESET = high) behavior - supports both real-time interrupt-driven and polled-system fault handling architectures. |
| Wide common-mode input range | –0.2 V to +26 V independent of supply voltage - enables direct high-side sensing on 24 V systems without auxiliary supplies or level shifters. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C operation with functional safety documentation support - suitable for ASIL-B–capable domain controllers and BCMs. |
Applications
| ADAS Domain Controller | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Real-time motor phase current monitoring in ADAS actuator drivers (e.g., radar gimbal, camera focus motors). IC Role / Device Role / Timing Role: Current-sense amplifier + comparator detects overcurrent during stall or jam conditions; ALERT asserts within <10 µs to trigger immediate PWM shutdown. Use Value: Prevents MOSFET destruction and ensures fail-safe actuation by enabling sub-10 µs fault response without host MCU intervention. |
Use Scenario: Load current supervision for window lift, seat position, and interior heater circuits in centralized BCMs. IC Role / Device Role / Timing Role: High-side sensing on 12 V distribution rails; latched ALERT mode holds fault state until MCU reset command via RESET pin. Use Value: Eliminates missed fault detection during periodic polling cycles - essential for Class 2 diagnostic compliance in ISO 16750-2. |
| Roof Motor Module | Telematics Control Unit |
|
Use Scenario: Overcurrent protection for sunroof and panoramic roof motor drivers subjected to mechanical binding. IC Role / Device Role / Timing Role: Low-side sensing with 200 V/V gain amplifies 5 mV shunt drop to 1 V output; comparator compares against 0.5 V reference for 2.5 A trip threshold. Use Value: Enables use of 2 mΩ shunt (vs. 10 mΩ), reducing power loss by 76% at 10 A continuous load - extending module thermal margin. |
Use Scenario: Always-on current monitoring for LTE/V2X modem power rails in TCU power management subsystems. IC Role / Device Role / Timing Role: Measures standby current consumption; transparent ALERT mode signals abnormal draw (>100 mA) to wake host processor. Use Value: Supports ultra-low-quiescent design (350 µA device IQ) while maintaining rapid fault detection - critical for battery-backed TCU sleep modes. |
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 |
|---|---|---|---|
| INA240A4QDRQ1 | 200 V/V gain, 800 kHz bandwidth, no integrated comparator; requires external comparator or MCU GPIO comparison. | Better suited for high-bandwidth motor control where comparator timing is handled by fast MCU; lacks built-in hysteresis and latch mode. | Select when >350 kHz bandwidth is required and system already includes comparator logic or high-speed ADC sampling. |
| MAX40056ATA+T | 200 V/V gain, 400 kHz bandwidth, integrated comparator with 25 mV hysteresis, but only –0.1 V to +5 V common-mode range. | Limited to low-side sensing only; incompatible with 12 V/24 V high-side bus monitoring without level-shifting circuitry. | Select for cost-sensitive low-voltage industrial applications where common-mode range ≤5 V suffices and smaller SOIC-8 footprint is preferred. |
Compared with INA381A4QDGSRQ1, INA240A4QDRQ1 trades integrated protection for higher bandwidth and lower offset, while MAX40056ATA+T sacrifices common-mode range for faster comparator response - making INA381A4QDGSRQ1 uniquely balanced for automotive high-side/low-side dual-role current monitoring with autonomous fault signaling.
Availability
INA381A4QDGSRQ1 is available at Aetrix Electronics and suitable for automotive body control modules, ADAS domain controllers, and telematics control units requiring stable component supply with AEC-Q100 qualification and functional safety documentation support.
Supply support for INA381A4QDGSRQ1 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 specifically designed for automotive overcurrent protection in space-constrained, thermally demanding environments - targeting ASIL-B–compliant systems requiring fast, reliable fault detection.
FAQ
What is the maximum common-mode voltage supported by the INA381A4QDGSRQ1?
The INA381A4QDGSRQ1 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 high-side sensing on 12 V and 24 V automotive battery rails without external level-shifting circuitry. The device remains undamaged even when 26 V is applied to IN+/IN– pins with VS removed, per absolute maximum ratings.
How does the gain option A4 affect the INA381A4QDGSRQ1's performance compared to other variants?
The "A4" suffix denotes 200 V/V fixed gain, resulting in 105 kHz small-signal bandwidth and ±1% max gain error at 25°C. Compared to A1 (20 V/V, 350 kHz), A4 trades bandwidth for higher sensitivity - enabling detection of smaller shunt voltages (e.g., 5 mV → 1 V output). This makes INA381A4QDGSRQ1 optimal for low-current precision monitoring where resolution outweighs speed.
Can the INA381A4QDGSRQ1 operate in both high-side and low-side current sensing configurations?
Yes, the INA381A4QDGSRQ1 supports both configurations. Its –0.2 V to +26 V common-mode range permits high-side sensing on positive rails (e.g., battery feed to load) and low-side sensing near ground. In low-side mode, offset voltage is ≤150 µV at 0 V CM, enabling accurate measurement of small currents with minimal shunt loss - validated in TI's SLYS041A datasheet Figure 6-5.
What is the purpose of the RESET pin on the INA381A4QDGSRQ1?
The RESET pin configures the ALERT output behavior: pulled low for transparent mode (ALERT follows input state in real time), or pulled high for latched mode (ALERT stays asserted until RESET is pulsed low). This enables flexible fault-handling strategies - transparent mode suits interrupt-driven MCUs, while latched mode ensures no fault is missed during periodic polling in resource-constrained systems.
Does the INA381A4QDGSRQ1 meet AEC-Q100 reliability standards for automotive use?
Yes, the INA381A4QDGSRQ1 is AEC-Q100 qualified for Device Temperature Grade 1 (–40°C to +125°C ambient), with documented test results for HTOL, TC, UHAST, and ESD (HBM ±3000 V, CDM ±1000 V). It also provides functional safety documentation to aid ISO 26262 ASIL-B system design - confirmed in Section 1 of the SLYS041A datasheet.
INA381A4QDGSRQ1 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
INA381A4QDGSRQ1 FAQ
1.How can I place an order for INA381A4QDGSRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA381A4QDGSRQ1 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 INA381A4QDGSRQ1 reliable?
The price and inventory of INA381A4QDGSRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA381A4QDGSRQ1 is usually 5 days.
3.What payment methods are accepted for INA381A4QDGSRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA381A4QDGSRQ1 transactions.
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4.How is shipping managed for INA381A4QDGSRQ1?
INA381A4QDGSRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA381A4QDGSRQ1 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 INA381A4QDGSRQ1?
For technical support, including INA381A4QDGSRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA381A4QDGSRQ1 requirements.
6.How does Aetrix verify that INA381A4QDGSRQ1 is sourced from the original manufacturer or authorized distributors?
All INA381A4QDGSRQ1 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 INA381A4QDGSRQ1 meets industry standards.
7.What is the process for return or replacement of INA381A4QDGSRQ1?
All INA381A4QDGSRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA381A4QDGSRQ1, 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 INA381A4QDGSRQ1 part is unused and in its original packaging.
Return procedure for INA381A4QDGSRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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