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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Current Regulation/Management

Texas Instruments INA381A1IDSGT

Name: INA381A1IDSGT
Brand: Texas Instruments
SKU: INA381A1IDSGT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: INA381A1IDSGT

Manufacturer:: Texas Instruments

Category:: Current Regulation/Management

Package:: 8-WFDFN Exposed Pad

Datasheet:: INA381A1IDSGT.pdf

Description:: IC CURRENT SENSE 1% 8WSON

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Product details

Overview

INA381A1IDSGT from Texas Instruments is a 26-V, high-speed current-sense amplifier with integrated comparator, designed for overcurrent detection in high-side and low-side shunt configurations. It delivers 20 V/V gain, ±500 µV max offset at 12 V common-mode, 350 kHz bandwidth, and <10 µs total system overcurrent response time-used in merchant server PSUs and BLDC motor drives.

For engineers reviewing the INA381A1IDSGT datasheet, INA381A1IDSGT pinout, INA381A1IDSGT application, or INA381A1IDSGT equivalent, this page provides verified pin functions, real-world timing behavior, confirmed comparator hysteresis (50 mV), supply range (2.7–5.5 V), and validated alternative options for overcurrent protection designs.

Technical Context

The INA381A1IDSGT implements a zero-drift topology enabling ±150 µV max input offset at 0 V common-mode and 1 µV/°C drift across –40°C to +125°C. Its amplifier supports –0.2 V to +26 V common-mode input independent of 2.7–5.5 V supply voltage, allowing direct high-side sensing on 24-V rails without level-shifting.

The integrated open-drain comparator features 400 ns propagation delay (typ), 50 mV hysteresis, and dual alert modes (transparent/latched) controlled via RESET pin. Total overcurrent detection latency-including amplifier settling and comparator response-is specified <10 µs, with VOUT swing limited to VS – 0.05 V and GND + 0.005 V under load.

Key Specifications

Parameter	Value and Actual Design Meaning
Gain	20 V/V - fixed ratio; sets output voltage = 20 × (IN+ − IN−); enables precise scaling for 10-mV shunt signals
Common-mode input range	–0.2 V to +26 V - supports direct high-side sensing on 24-V bus without external level shifters
Offset voltage (max)	±500 µV at VCM = 12 V - ensures <25 mA error when measuring 100-mA current through 10-mΩ shunt
Bandwidth	350 kHz - captures fast transients in BLDC motor phase currents or PSU fault events
Supply voltage	2.7 V to 5.5 V - compatible with 3.3-V and 5-V microcontroller I/O domains
Quiescent current	350 µA max - enables always-on monitoring in battery-backed systems without significant drain
Comparator hysteresis	50 mV - prevents false triggering near threshold due to noise on VOUT or CMPREF

Pinout & Package

INA381A1IDSGT is housed in an 8-pin WSON package (2.00 mm × 2.00 mm) with exposed thermal pad. The package supports reflow soldering and requires thermal pad connection to PCB ground for optimal thermal performance (R_θJB = 43.4 °C/W).

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 with –0.2 V lower limit
VOUT	Analog output	Amplified sense voltage (20× V_{SENSE); rail-to-rail swing capability supports ADC interfacing}
ALERT	Digital output	Active-low open-drain flag; requires external 10-kΩ pullup; asserts within <10 µs of overcurrent
RESET	Digital input	Selects latched (pulled low) or transparent (pulled high) alert mode; no internal pullup
CMPIN	Analog input	Comparator input; typically tied to VOUT to monitor amplified shunt voltage
CMPREF	Analog input	Comparator reference; sets overcurrent threshold via external resistor divider or precision reference
GND	Ground	Device ground reference; thermal pad must be externally connected to system ground
VS+	Power supply	Single 2.7–5.5 V supply; powers both amplifier and comparator; decoupling capacitor required

Key Features

Feature	Design Value
Zero-drift amplifier architecture	Enables ±150 µV max offset at 0 V common-mode and 1 µV/°C drift-critical for stable low-current measurement over temperature
Integrated comparator with hysteresis	50 mV hysteresis eliminates chatter during threshold crossing; 400 ns propagation delay enables sub-microsecond fault response
High common-mode rejection	84–100 dB CMRR across –40°C to +125°C-rejects bus noise in 24-V industrial power rails
Latched vs transparent alert modes	RESET pin configures persistent fault latch (for safety-critical shutdown) or real-time status mirroring (for continuous monitoring)
Robust absolute maximum ratings	Withstands 26 V on IN+/IN− pins even with VS = 0 V-prevents damage during hot-swap or brownout conditions

Applications

Merchant Server PSU	DC-Input BLDC Motor Drive
Use Scenario: Real-time phase current monitoring and overcurrent cutoff in 48-V server power supplies. IC Role / Device Role / Timing Role: High-side current-sense amplifier and fast comparator providing <10 µs fault detection latency. Use Value: Enables compliance with IEC 62368-1 short-circuit protection requirements while minimizing shunt power loss via 20 V/V gain and low offset.	Use Scenario: Low-side current sensing in cordless power tool motor controllers with 18–24 V battery input. IC Role / Device Role / Timing Role: Amplifies mV-level shunt voltage and triggers immediate gate shutdown via ALERT signal. Use Value: 350 kHz bandwidth tracks rapid motor current spikes; 2.7–5.5 V supply matches MCU domain, eliminating level-shifters.
Cordless Power Tool	Headsets & Earbuds
Use Scenario: Battery discharge current monitoring and overcurrent protection during stall conditions. IC Role / Device Role / Timing Role: Measures bidirectional current flow using low-offset amplifier; ALERT asserts on >15-A threshold. Use Value: ±500 µV offset enables accurate 10-mA resolution at 100-A full scale; 350 µA quiescent current extends runtime.	Use Scenario: Charging current limiting and thermal foldback in USB-C audio accessories. IC Role / Device Role / Timing Role: Low-side shunt monitor feeding ADC and comparator for fast charge termination. Use Value: 20 V/V gain scales 20-mV shunt drop to 400-mV ADC input; compact 2 mm × 2 mm WSON fits space-constrained earbud PCBs.

Merchant Server PSU

DC-Input BLDC Motor Drive

Use Scenario: Real-time phase current monitoring and overcurrent cutoff in 48-V server power supplies.

IC Role / Device Role / Timing Role: High-side current-sense amplifier and fast comparator providing <10 µs fault detection latency.

Use Value: Enables compliance with IEC 62368-1 short-circuit protection requirements while minimizing shunt power loss via 20 V/V gain and low offset.

Use Scenario: Low-side current sensing in cordless power tool motor controllers with 18–24 V battery input.

IC Role / Device Role / Timing Role: Amplifies mV-level shunt voltage and triggers immediate gate shutdown via ALERT signal.

Use Value: 350 kHz bandwidth tracks rapid motor current spikes; 2.7–5.5 V supply matches MCU domain, eliminating level-shifters.

Cordless Power Tool

Headsets & Earbuds

Use Scenario: Battery discharge current monitoring and overcurrent protection during stall conditions.

IC Role / Device Role / Timing Role: Measures bidirectional current flow using low-offset amplifier; ALERT asserts on >15-A threshold.

Use Value: ±500 µV offset enables accurate 10-mA resolution at 100-A full scale; 350 µA quiescent current extends runtime.

Use Scenario: Charging current limiting and thermal foldback in USB-C audio accessories.

IC Role / Device Role / Timing Role: Low-side shunt monitor feeding ADC and comparator for fast charge termination.

Use Value: 20 V/V gain scales 20-mV shunt drop to 400-mV ADC input; compact 2 mm × 2 mm WSON fits space-constrained earbud PCBs.

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
INA381A2IDSGT	50 V/V gain (vs. 20 V/V); same package, pinout, and specs otherwise	Better suited for lower shunt voltages (<4 mV full-scale) where higher gain improves SNR	Select when sensing <50 mA through 10-mΩ shunt; requires recalculating CMPREF threshold
INA240A1DRCR	20 V/V gain, but wider common-mode (–4 to 80 V); no integrated comparator; SO-8 package	Requires external comparator and logic for alert generation; better for ultra-high-voltage industrial systems	Choose when operating above 26 V common-mode or needing >120-dB CMRR; adds BOM and layout complexity

Compared with INA381A2IDSGT and INA240A1DRCR, the INA381A1IDSGT offers optimal balance of gain, speed, and integration for 12–24 V systems requiring self-contained overcurrent protection-no external comparator needed, and footprint matches compact WSON-8 constraints.

Availability

INA381A1IDSGT is available at Aetrix Electronics and suitable for merchant server PSUs, DC-input BLDC motor drives, and cordless power tools requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for INA381A1IDSGT 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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers and power management ICs.

The INA381 product line targets high-speed, high-accuracy current sensing in power conversion and motor control, integrating amplifier and comparator to reduce system-level fault response time and BOM count.

FAQ

What is the maximum common-mode voltage the INA381A1IDSGT can handle?

The INA381A1IDSGT 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 24-V rails without external level-shifting circuitry. The device remains undamaged even if IN+ and IN− are exposed to 26 V while VS = 0 V, per absolute maximum ratings.

How does the RESET pin configure alert behavior on the INA381A1IDSGT?

The RESET pin on the INA381A1IDSGT selects between transparent and latched alert modes: pulled high (≥1.4 V), it enables transparent mode where ALERT follows CMPIN/CMPREF comparison in real time; pulled low (≤0.4 V), it activates latched mode where ALERT stays asserted until RESET is toggled. No internal pullup exists-external biasing is required.

What is the typical total overcurrent response time of the INA381A1IDSGT?

The total system overcurrent response time of the INA381A1IDSGT is less than 10 µs. This includes amplifier settling, comparator propagation delay (400 ns typ), and hysteresis recovery. Measured from VSENSE step exceeding threshold to ALERT assertion, it enables compliance with fast-fault standards in server PSUs and motor drives.

Can the INA381A1IDSGT operate with a 3.3-V supply?

Yes, the INA381A1IDSGT operates from 2.7 V to 5.5 V, making 3.3 V fully supported. At 3.3 V, VOUT swings from GND + 0.005 V to VS – 0.05 V (i.e., 3.25 V), and ALERT's VOL remains ≤300 mV at 3 mA sink-compatible with 3.3-V GPIO inputs. Quiescent current is 350 µA max at 25°C.

What package type is used by the INA381A1IDSGT, and what are its thermal requirements?

The INA381A1IDSGT uses the 8-pin WSON package (DSG) with 2.00 mm × 2.00 mm body and exposed thermal pad. The thermal pad must be soldered to a PCB ground plane to achieve R_θJB = 43.4 °C/W. Layout requires ≥100-mil thermal vias under the pad and avoids floating copper islands to ensure reliable heat dissipation at full temperature range (–40°C to +125°C).

INA381A1IDSGT Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: Zero-Drift

Package/Case:: 8-WFDFN Exposed Pad

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:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-WSON (2x2)

INA381A1IDSGT FAQ

1.How can I place an order for INA381A1IDSGT through Aetrix?

Please submit a Request for Quotation (RFQ) for INA381A1IDSGT 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 INA381A1IDSGT reliable?

The price and inventory of INA381A1IDSGT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA381A1IDSGT is usually 5 days.

3.What payment methods are accepted for INA381A1IDSGT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA381A1IDSGT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for INA381A1IDSGT?

INA381A1IDSGT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your INA381A1IDSGT 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 INA381A1IDSGT?

For technical support, including INA381A1IDSGT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA381A1IDSGT requirements.

6.How does Aetrix verify that INA381A1IDSGT is sourced from the original manufacturer or authorized distributors?

All INA381A1IDSGT 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 INA381A1IDSGT meets industry standards.

7.What is the process for return or replacement of INA381A1IDSGT?

All INA381A1IDSGT units undergo pre-shipment inspection (PSI). If there is an issue with INA381A1IDSGT, 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 INA381A1IDSGT part is unused and in its original packaging.

Return procedure for INA381A1IDSGT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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