My Inquiry
My Account
Texas Instruments INA381A1IDGST
- Part No.:
- INA381A1IDGST
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA381A1IDGST.pdf
- Description:
- IC CURRENT SENSE 1% 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,954
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
INA381A1IDGST 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 400 ns comparator propagation delay. It operates from 2.7 V to 5.5 V supply and supports real-time protection in DC/DC converters and BLDC motor drives.
For engineers reviewing the INA381A1IDGST datasheet, INA381A1IDGST pinout, INA381A1IDGST application, or INA381A1IDGST equivalent, this page provides verified functional context, validated package mapping (VSSOP-10), confirmed pin roles, and two technically documented alternative parts for overcurrent monitoring designs requiring sub-10 µs total system response time.
Technical Context
The INA381A1IDGST uses a zero-drift topology enabling ≤150 µV max input offset at 0 V common-mode and 1 µV/°C drift over –40°C to +125°C. Its amplifier supports –0.2 V to +26 V input common-mode range 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 50 mV hysteresis, transparent/latched alert modes controlled via RESET pin, and <2 µs large-signal alert response. Total overcurrent protection latency-including amplifier settling and comparator propagation-is <10 µs, with 250–350 µA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V fixed-sets output scaling for 10-mV shunt drops to 200-mV full-scale, enabling precise low-current detection. |
| Input Offset Voltage | ±500 µV max at 12 V VCM-limits measurement error to ≤25 mA when using 20-mΩ shunt at 1 A sense current. |
| Common-Mode Range | –0.2 V to +26 V-supports direct high-side sensing on 24-V bus without external level shifters or isolation. |
| Bandwidth | 350 kHz-captures fast current transients in BLDC motor commutation or PSU fault events. |
| Comparator Propagation Delay | 400 ns typ-enables rapid fault flagging before destructive energy accumulates in power stages. |
| Supply Voltage | 2.7 V to 5.5 V-compatible with standard 3.3-V or 5-V microcontroller I/O domains and ADC references. |
| Operating Temperature | –40°C to +125°C-qualified for under-hood automotive, industrial motor control, and server PSU environments. |
Pinout & Package
INA381A1IDGST is housed in a 10-pin VSSOP package (3.00 mm × 3.00 mm) with exposed thermal pad. The package supports automated optical inspection and offers 188.6°C/W junction-to-ambient thermal resistance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN+ | Analog input (non-inverting) | Connects to supply side of shunt resistor in high-side sensing; tolerates up to +26 V regardless of VS. |
| 2 VS+ | Power supply input | Accepts 2.7–5.5 V; powers both amplifier and comparator; decoupling capacitor required at pin. |
| 3 ALERT | Digital output (open-drain) | Active-low fault flag; requires external 10-kΩ pullup; sinks ≥3 mA; compatible with 3.3-V or 5-V logic. |
| 4 RESET | Digital input | Selects latched (pulled low) or transparent (pulled high) alert mode; no internal pullup/pulldown. |
| 5 GND | Ground reference | System ground connection; thermal pad must be soldered to PCB ground plane for thermal and electrical integrity. |
| 6 NC | No connect | Not internally bonded; may be left floating, grounded, or tied to VS+ per layout requirements. |
| 7 CMPREF | Analog input (comparator reference) | Accepts external threshold voltage (e.g., from REF3140); sets overcurrent trip point for VOUT comparison. |
| 8 CMPIN | Analog input (comparator input) | Receives amplified shunt voltage from VOUT; comparator triggers when CMPIN > CMPREF + 50 mV hysteresis. |
| 9 VOUT | Analog output | 20× amplified differential voltage across shunt; rail-to-rail swing (VS – 0.05 V min) into 10-kΩ load. |
| 10 IN− | Analog input (inverting) | Connects to load side of shunt resistor; enables bidirectional current sensing when referenced to negative rail. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | Enables ≤150 µV max offset at 0 V VCM and 1 µV/°C drift-critical for accurate low-current measurement across temperature. |
| Integrated comparator with hysteresis | 50 mV built-in hysteresis prevents false triggering near threshold; eliminates need for external Schmitt trigger circuitry. |
| High-speed alert response | Total system overcurrent detection <10 µs-fast enough to protect MOSFETs and gate drivers before thermal runaway. |
| Wide common-mode independence | Operates with –0.2 V to +26 V inputs while powered from 2.7–5.5 V-removes need for isolated supplies or level shifters. |
| Latched vs transparent alert modes | RESET pin configures persistent fault flag (latched) or real-time status mirroring (transparent)-supports diverse system recovery logic. |
Applications
| Merchant Server PSU | DC-input BLDC Motor Drive |
|---|---|
|
Use Scenario: Real-time phase current monitoring and overcurrent shutdown in 48-V server power supplies. IC Role / Device Role / Timing Role: High-side current-sense amplifier and fault detector; provides analog VOUT for ADC sampling and digital ALERT for immediate PWM disable. Use Value: Enables <10 µs fault response to prevent MOSFET failure during short-circuit events, improving PSU reliability and MTBF. |
Use Scenario: Per-phase current feedback and overcurrent protection in cordless power tool motor controllers. IC Role / Device Role / Timing Role: Low-latency current monitor with integrated comparator; delivers VOUT to MCU ADC and ALERT to hardware safety interrupt. Use Value: Eliminates separate comparator IC, reducing BOM count and PCB area while maintaining <2 µs comparator-only response. |
| Industrial DC/DC Converter | Cordless Power Tool Battery Pack |
|
Use Scenario: Input current limiting and overload detection in isolated 24-V to 5-V DC/DC modules. IC Role / Device Role / Timing Role: High-side shunt monitor with wide VCM tolerance; senses upstream current before isolation barrier. Use Value: Supports direct sensing on 24-V primary side without auxiliary supply or optocouplers-reducing design complexity and cost. |
Use Scenario: Cell-level or pack-level overcurrent protection during high-torque motor startup in 18-V/20-V battery tools. IC Role / Device Role / Timing Role: Fast-response current limiter; ALERT asserts within 400 ns of overcurrent event to trigger FET gate shutdown. Use Value: Prevents fuse blowout and connector arcing by cutting current before peak surge exceeds safe limits. |
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 |
|---|---|---|---|
| INA240A1QDR | 20 V/V gain, 4 V/V to 500 V/V programmable via external resistors; 100 kHz bandwidth; no integrated comparator. | Requires external comparator and reference for overcurrent flagging; better suited for precision analog feedback than fast fault response. | Choose INA240A1QDR when higher gain flexibility and lower offset (±5 µV) are prioritized over integrated alert functionality. |
| MAX40056ATA+T | 20 V/V gain, 1 MHz bandwidth, 125 ns comparator propagation delay; 2.7–5.5 V supply; no latched mode support. | Higher speed but lacks configurable alert latching; requires external hysteresis network for noise immunity. | Choose MAX40056ATA+T when sub-500 ns total alert latency is mandatory and latch control is handled externally. |
Compared with INA381A1IDGST, INA240A1QDR trades integrated comparator functionality for superior DC accuracy and gain configurability, while MAX40056ATA+T delivers faster raw comparator response but requires additional components to match the robust, self-contained overcurrent protection of the INA381A1IDGST.
Availability
INA381A1IDGST is available at Aetrix Electronics and suitable for merchant server PSUs, DC-input BLDC motor drives, and industrial DC/DC converters requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for INA381A1IDGST 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 decades of expertise in precision signal conditioning and power management ICs.
The INA381 product line targets high-reliability overcurrent protection in power conversion and motor control systems, integrating precision amplification and fast digital alerting to simplify fault-detection subsystems.
FAQ
What is the maximum common-mode voltage the INA381A1IDGST can handle?
The INA381A1IDGST 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 bus rails without level-shifting circuitry. The device remains undamaged even when 26 V is applied to IN+ and IN− pins with VS = 0 V, making it robust for hot-swap and fault-tolerant applications.
Does the INA381A1IDGST require external components to operate as a complete overcurrent detector?
No-the INA381A1IDGST integrates both a precision current-sense amplifier and a comparator with 50 mV hysteresis. Only an external 10-kΩ pullup resistor on ALERT and a reference voltage source (e.g., REF3140 or resistor divider) on CMPREF are required. No external op-amps, comparators, or hysteresis networks are needed, reducing BOM count and board space.
How does the RESET pin affect the behavior of the ALERT output on the INA381A1IDGST?
The RESET pin configures the ALERT output mode: pulled high (≥1.4 V) enables transparent mode where ALERT follows the comparator state in real time; pulled low (≤0.4 V) enables latched mode where ALERT stays asserted until RESET is toggled. This dual-mode capability supports both continuous monitoring and fault-locking safety architectures without firmware intervention.
What is the total overcurrent detection latency of the INA381A1IDGST?
The total system overcurrent protection response time of the INA381A1IDGST is less than 10 µs. This includes amplifier settling, comparator propagation (400 ns typ), and hysteresis recovery. Measured from current step onset at the shunt to stable ALERT assertion, this latency enables protection of fast-switching power stages such as GaN FETs and high-frequency motor inverters.
Can the INA381A1IDGST be used for bidirectional current sensing?
Yes-the INA381A1IDGST supports bidirectional sensing when the shunt is placed between load and ground (low-side) and IN− is referenced to a negative potential. Its –0.2 V minimum common-mode input allows operation with slightly negative shunt voltages, and the 20 V/V gain preserves polarity information on VOUT. However, the comparator only triggers on positive overcurrent; external circuitry is needed for reverse-fault detection.
INA381A1IDGST 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
INA381A1IDGST FAQ
1.How can I place an order for INA381A1IDGST through Aetrix?
Please submit a Request for Quotation (RFQ) for INA381A1IDGST 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 INA381A1IDGST reliable?
The price and inventory of INA381A1IDGST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA381A1IDGST is usually 5 days.
3.What payment methods are accepted for INA381A1IDGST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA381A1IDGST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA381A1IDGST?
INA381A1IDGST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA381A1IDGST 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 INA381A1IDGST?
For technical support, including INA381A1IDGST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA381A1IDGST requirements.
6.How does Aetrix verify that INA381A1IDGST is sourced from the original manufacturer or authorized distributors?
All INA381A1IDGST 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 INA381A1IDGST meets industry standards.
7.What is the process for return or replacement of INA381A1IDGST?
All INA381A1IDGST units undergo pre-shipment inspection (PSI). If there is an issue with INA381A1IDGST, 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 INA381A1IDGST part is unused and in its original packaging.
Return procedure for INA381A1IDGST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA381A1IDGST 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…
