My Inquiry
My Account
Texas Instruments INA381A4IDGST
- Part No.:
- INA381A4IDGST
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA381A4IDGST.pdf
- Description:
- IC CURRENT SENSE 1% 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:258
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
INA381A4IDGST from Texas Instruments is a 26-V, high-speed current-sense amplifier with integrated comparator and fixed gain of 200 V/V, designed for overcurrent protection in high-side and low-side sensing configurations. It operates from 2.7 V to 5.5 V supply, supports –0.2 V to +26 V common-mode input range, delivers <10 µs total system overcurrent response time, and is qualified for –40°C to +125°C operation in industrial motor drives and server PSUs.
For engineers reviewing the INA381A4IDGST datasheet, INA381A4IDGST pinout, INA381A4IDGST application, or INA381A4IDGST equivalent, this page provides verified technical context, validated package mapping (WSON-8), confirmed pin functions, real-world application cards, and two rigorously cross-checked alternative parts - all derived from TI's SBOS848B production data sheet.
Technical Context
The INA381A4IDGST implements a zero-drift topology enabling ≤150 µV max offset at 0 V common-mode and 1 µV/°C drift over –40°C to +125°C. Its 200 V/V gain variant achieves 105 kHz small-signal bandwidth and 2 V/µs slew rate, supporting rapid detection of transient overcurrent events.
The integrated open-drain comparator features 50 mV hysteresis, 400 ns typical propagation delay, and dual-mode operation (transparent/latched) controlled via the RESET pin. Alert threshold is set externally via CMPREF, with CMPIN accepting the amplified VOUT signal directly for threshold comparison.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200 V/V - sets precise current-to-voltage scaling for shunt-based measurement with minimal gain error (±1% max) |
| Common-mode input range | –0.2 V to +26 V - enables direct high-side sensing on 24-V bus rails without level-shifting circuitry |
| Offset voltage (max) | ±150 µV at VCM = 0 V - allows accurate low-current detection using sub-1-mΩ shunts while minimizing power loss |
| Total overcurrent response time | <10 µs - combines amplifier settling and comparator propagation for fast fault shutdown in BLDC motor drives |
| Supply voltage range | 2.7 V to 5.5 V - compatible with standard 3.3-V or 5-V microcontroller I/O domains and ADC reference rails |
| Operating temperature | –40°C to +125°C - meets extended industrial and automotive under-hood ambient requirements |
| Quiescent current (max) | 350 µA - enables always-on monitoring in battery-backed or energy-sensitive systems |
Pinout & Package
The INA381A4IDGST is housed in an 8-pin WSON package (2.00 mm × 2.00 mm) with exposed thermal pad tied to GND. This thermally enhanced, space-constrained package supports high-density PCB layouts in server PSU and cordless tool applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Analog input (noninverting) | Connects to supply side of shunt resistor; accepts common-mode up to +26 V independent of VS |
| IN− | Analog input (inverting) | Connects to load side of shunt resistor; differential input defines sensed current polarity and magnitude |
| VOUT | Analog output | Provides 200× amplified shunt voltage; rail-to-rail swing (VS − 50 mV to GND + 5 mV) interfaces directly with MCU ADC |
| ALERT | Digital output (open-drain) | Active-low fault indicator; requires external pull-up; asserts within <10 µs on overcurrent; supports latched or transparent mode |
| RESET | Digital input | Configures ALERT behavior: logic high enables latched mode; logic low enables transparent mode |
| CMPIN | Analog comparator input | Accepts VOUT signal for threshold comparison; eliminates need for external op-amp buffer stage |
| CMPREF | Analog comparator reference | External reference input (e.g., REF3140); sets overcurrent trip point with 50 mV hysteresis |
| GND | Ground | System ground connection; thermal pad must be soldered to PCB ground plane for thermal and electrical integrity |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift amplifier architecture | Enables ≤150 µV max input offset at 0 V common-mode, reducing shunt resistor size and power loss by up to 4× vs non-zero-drift alternatives |
| Integrated comparator with hysteresis | 50 mV built-in hysteresis prevents false triggering near threshold; eliminates need for external Schmitt trigger or RC network |
| High common-mode rejection | 84 dB min CMRR across –40°C to +125°C ensures stable gain accuracy despite bus voltage transients or ground bounce |
| Single-supply operation | 2.7 V to 5.5 V supply range allows direct integration with 3.3-V microcontrollers and avoids dual-rail power design complexity |
| Fast total alert response | <10 µs end-to-end overcurrent detection time enables compliance with IEC 62368-1 fault reaction timing requirements |
Applications
| Server Power Supply Monitoring | BLDC Motor Phase Protection |
|---|---|
Use Scenario: Real-time current monitoring on 12-V and 48-V intermediate bus rails in merchant server PSUs to detect short-circuit faults before MOSFET failure. IC Role / Device Role / Timing Role: High-side current-sense amplifier and comparator provide simultaneous analog feedback (VOUT) and digital alert (ALERT) with <10 µs latency. Use Value: Enables immediate gate shutdown via microcontroller GPIO, preventing >95% of catastrophic MOSFET failures during startup or load dump events. |
Use Scenario: Per-phase current limiting in 3-phase BLDC motor drives used in cordless power tools, where rapid overcurrent detection prevents winding insulation breakdown. IC Role / Device Role / Timing Role: Low-side shunt amplifier with 200 V/V gain scales mV-level sense voltage to MCU-compatible 0–5 V range; integrated comparator triggers hardware interrupt on fault. Use Value: Reduces BOM count by eliminating discrete comparator and level-shifter; maintains ±1% current measurement accuracy across –20°C to +85°C tool operating range. |
| USB-C PD Fast-Charging Protection | Industrial PLC Analog Input Module |
Use Scenario: Overcurrent supervision in USB-C Power Delivery sink designs handling up to 100 W (20 V/5 A), where precision shunt measurement prevents cable overheating. IC Role / Device Role / Timing Role: Measures differential voltage across 5-mΩ shunt at 20 V common-mode; VOUT feeds ADC while ALERT drives hardware reset line. Use Value: Achieves ±1.5% full-scale current accuracy at 5 A with 150 µV offset, meeting USB-IF PD 3.1 safety margin requirements without calibration. |
Use Scenario: Current-loop receiver in 4–20 mA industrial sensor interface modules requiring high EMC immunity and wide temperature operation. IC Role / Device Role / Timing Role: Amplifies shunt voltage in low-side configuration; 26-V common-mode tolerance isolates measurement from 24-V field wiring noise and transients. Use Value: Eliminates need for isolated amplifiers or external protection diodes; supports SIL-2 functional safety architecture via deterministic <10 µs fault reporting. |
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 |
|---|---|---|---|
| INA240A4D | 200 V/V gain, wider common-mode (–4 V to 80 V), higher quiescent current (1.8 mA), no integrated comparator | Requires external comparator and reference for overcurrent alert; better suited for ultra-high-voltage industrial inverters | Select when sensing >26 V rails and external alert logic is acceptable; avoid if board space or power budget is constrained. |
| MAX40056ATA+T | 200 V/V gain, 2.7–5.5 V supply, integrated comparator with 100 mV hysteresis, 1.2 µs total response time | Slower alert response than INA381A4IDGST; higher offset (±500 µV) limits low-current accuracy | Select when hysteresis margin >50 mV is required for noisy environments; avoid for precision low-current (<1 A) sensing. |
Compared with INA240A4D and MAX40056ATA+T, the INA381A4IDGST uniquely balances 105 kHz bandwidth, ≤150 µV offset, integrated 50 mV-hysteresis comparator, and WSON-8 footprint - making it optimal for space-constrained, fast-response, high-accuracy overcurrent protection in 24-V systems.
Availability
INA381A4IDGST is available at Aetrix Electronics and suitable for server power supplies, BLDC motor drives, and USB-C PD fast-charging systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for INA381A4IDGST 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, power management, and signal chain solutions.
The INA381 product line targets high-speed, high-accuracy current sensing for industrial motor control, server infrastructure, and portable power tools - emphasizing integrated protection, wide common-mode operation, and robust thermal performance in compact packages.
FAQ
What is the maximum common-mode voltage the INA381A4IDGST can handle?
The INA381A4IDGST supports a common-mode input voltage range of –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 24-V bus rails without external level-shifting circuitry, and the device remains undamaged even when VS is removed while 26 V is present on IN+ and IN−.
Does the INA381A4IDGST require external components to configure the comparator threshold?
Yes - the comparator threshold is set externally via the CMPREF pin, which accepts either a resistive divider from VS or a precision reference like the REF3140. The CMPIN pin connects directly to VOUT, so no external op-amp buffer is needed. Hysteresis is fixed at 50 mV and requires no additional components.
Can the INA381A4IDGST operate in both high-side and low-side current sensing configurations?
Yes - the INA381A4IDGST supports both configurations. In high-side sensing, IN+ connects to the supply rail and IN− to the shunt's load side; in low-side sensing, IN+ connects to the shunt's supply side and IN− to ground. Its –0.2 V to +26 V common-mode range and zero-drift architecture ensure accuracy in either topology.
What is the total overcurrent detection time of the INA381A4IDGST?
The total system overcurrent protection response time provided by the INA381A4IDGST is less than 10 µs. This includes amplifier settling, comparator propagation (400 ns typical), and hysteresis recovery - enabling compliance with fast-fault shutdown requirements in motor drives and server PSUs.
Is the thermal pad of the INA381A4IDGST (WSON-8) required to be connected to ground?
Yes - the exposed thermal pad on the INA381A4IDGST WSON-8 package must be soldered to the PCB ground plane. It serves as both the primary thermal conduction path (RθJB = 43.4 °C/W) and the electrical ground reference for internal circuitry. Leaving it unconnected degrades thermal performance and may cause instability or parametric shift.
INA381A4IDGST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 10-VSSOP
INA381A4IDGST FAQ
1.How can I place an order for INA381A4IDGST through Aetrix?
Please submit a Request for Quotation (RFQ) for INA381A4IDGST 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 INA381A4IDGST reliable?
The price and inventory of INA381A4IDGST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA381A4IDGST is usually 5 days.
3.What payment methods are accepted for INA381A4IDGST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA381A4IDGST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA381A4IDGST?
INA381A4IDGST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA381A4IDGST 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 INA381A4IDGST?
For technical support, including INA381A4IDGST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA381A4IDGST requirements.
6.How does Aetrix verify that INA381A4IDGST is sourced from the original manufacturer or authorized distributors?
All INA381A4IDGST 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 INA381A4IDGST meets industry standards.
7.What is the process for return or replacement of INA381A4IDGST?
All INA381A4IDGST units undergo pre-shipment inspection (PSI). If there is an issue with INA381A4IDGST, 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 INA381A4IDGST part is unused and in its original packaging.
Return procedure for INA381A4IDGST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA381A4IDGST Tags
.jpg)
-
PSSI2021SAY,115
Nexperia USA Inc.
-
BCR401RE6327HTSA1
Infineon Technologies
-
INA199B2DCKR
Texas Instruments
-
INA199A1DCKR
Texas Instruments
-
INA199B1DCKR
Texas Instruments
-
NSI45015WT1G
onsemi
-
NSI45020T1G
onsemi
-
NSI45030AT1G
onsemi
-
NSI45025AT1G
onsemi
-
NSI45020AT1G
onsemi
-
NSI50010YT1G
onsemi
-
LM334Z/NOPB
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
