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Texas Instruments INA300AIDSQR
- Part No.:
- INA300AIDSQR
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
INA300AIDSQR.pdf
- Description:
- IC CURRENT SENSE 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:5,438
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Product details
Overview
INA300AIDSQR from Texas Instruments is a 36-V common-mode current-sense comparator for overcurrent protection, featuring programmable threshold (0–250 mV), selectable response times (10/50/100 µs), ±500 µV max offset voltage, and open-drain latched/transparent alert output. It operates from 2.7 V to 5.5 V supply and supports shunt-based monitoring in power supplies and server VRMs.
For engineers reviewing the INA300AIDSQR datasheet, INA300AIDSQR pinout, INA300AIDSQR application, or INA300AIDSQR equivalent, this device delivers precise overcurrent detection with configurable hysteresis (2/4/8 mV), low quiescent current (135 µA active, 3.5 µA disabled), and operation across –40°C to +125°C - critical for industrial and telecom power integrity designs.
Technical Context
The INA300AIDSQR integrates a high-precision differential input stage with an internal 20-µA current source for resistor-programmed threshold setting, enabling direct mapping of shunt voltage to trip point without external amplification. Its wide 0 V to 36 V common-mode range operates independently of supply voltage, supporting high-side sensing in 12 V and 24 V systems.
Three digital-configurable delay modes (10/50/100 µs) implement noise-immune comparison windows, while independent HYS, LATCH, and ENABLE inputs allow real-time mode control without reconfiguration. The open-drain ALERT output supports both transparent (real-time) and latch (fault-hold) behavior, with 50 mV typical VOL at 3 mA sink.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Common-mode input range | 0 V to 36 V - enables direct high-side shunt sensing in 12 V/24 V/36 V bus applications without level-shifting. |
| Programmable threshold range | 0 mV to 250 mV - supports low-loss shunts (e.g., 0.5–5 mΩ) while maintaining resolution for sub-1% trip accuracy. |
| Response time options | 10 µs / 50 µs / 100 µs - selectable via DELAY pin to balance speed vs. noise immunity in switching power stages. |
| Input offset voltage | ±500 µV max - ensures <1% error at 50 mV sense voltage, critical for accurate 10 A–100 A overcurrent detection. |
| Hysteresis options | 2 mV / 4 mV / 8 mV - prevents chatter near threshold during transient load steps in DC-DC converters. |
| Supply current (active) | 135 µA max - enables always-on protection in battery-backed or energy-sensitive systems. |
| Operating temperature | –40°C to +125°C - qualified for under-hood automotive, industrial motor drives, and telecom rectifiers. |
Pinout & Package
INA300AIDSQR is packaged in a 10-pin WSON (DSQ) package with 2.00 mm × 2.00 mm body size and exposed thermal pad. Pin functions are validated per TI SBOS613C datasheet Figure 5-1 and Table 5-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Analog input | Connects to supply side of shunt resistor; accepts up to 36 V common-mode voltage. |
| IN– | Analog input | Connects to load side of shunt resistor; forms differential pair with IN+ for VSENSE measurement. |
| LIMIT | Analog input | Threshold reference input; sets trip point via 20 µA internal current source and external RLIMIT. |
| ENABLE | Digital input | Active-high enable; disables comparator and reduces IQ to ≤3.5 µA for standby power savings. |
| ALERT | Digital output | Open-drain, active-low fault indicator; sinks ≥3 mA; supports wired-OR fault bus architectures. |
| LATCH | Digital input | Selects latched (fault held until cleared) or transparent (real-time) output behavior. |
| DELAY | Digital input | Configures response time: GND = 50 µs, VS = 100 µs, open = 10 µs. |
| GND | Analog ground | Reference for analog inputs and internal bias; connects to PCB thermal pad for thermal performance. |
| VS | Power supply | 2.7 V to 5.5 V single supply; powers internal circuitry and defines logic thresholds for digital pins. |
| HYS | Digital input | Sets hysteresis: GND = 4 mV, VS = 8 mV, open = 2 mV - stabilizes decision boundary against noise. |
Key Features
| Feature | Design Value |
|---|---|
| Resistor-programmable threshold | Single external RLIMIT sets 0–250 mV trip point using internal 20 µA current source - eliminates DAC or precision reference IC. |
| Configurable response timing | Hardware-selectable 10/50/100 µs delays via DELAY pin - avoids firmware overhead and enables deterministic fault response. |
| Low-power disable mode | 3.5 µA max quiescent current when ENABLE = low - supports energy-efficient system-level power sequencing. |
| Flexible alert output mode | LATCH pin selects between transparent (instant fault reporting) or latched (fault retention until reset) - simplifies host MCU interrupt handling. |
| Wide common-mode tolerance | 0–36 V input range independent of VS - enables direct high-side sensing in buck converters, OR-ing controllers, and 48 V telecom systems. |
Applications
| Server VRM Protection | Industrial Power Supply OCP |
|---|---|
|
Use Scenario: Real-time overcurrent monitoring on multiphase CPU/GPU VRM output rails with fast transient response requirements. IC Role / Device Role / Timing Role: Current-sense comparator detecting shunt voltage excursions >100 mV within 10 µs to trigger PMBus fault signaling or phase shutdown. Use Value: 10 µs response time and ±500 µV offset ensure reliable detection of 20 A+ faults before MOSFET thermal runaway occurs. |
Use Scenario: Overcurrent protection in 24 V industrial AC/DC power supplies feeding PLC I/O modules and servo drivers. IC Role / Device Role / Timing Role: High-side shunt monitor comparing sensed voltage against 50 mV threshold with 100 µs averaging to reject PWM switching noise. Use Value: 100 µs delay mode suppresses false trips from 100 kHz switching harmonics while maintaining <1 ms fault clearance. |
| Telecom Rectifier Monitoring | Battery Charger Safety |
|
Use Scenario: Input overcurrent detection in 48 V telecom rectifiers where bus voltage can reach 58 V during boost operation. IC Role / Device Role / Timing Role: Common-mode tolerant comparator measuring shunt voltage at 48 V bus potential, referenced to local GND via isolated supply. Use Value: 36 V max common-mode rating allows direct connection to 48 V rail with external clamping, reducing BOM count vs. isolated amplifiers. |
Use Scenario: Cell-level overcurrent cutoff in multi-cell Li-ion battery chargers during constant-current phase. IC Role / Device Role / Timing Role: Low-offset comparator monitoring 1 mΩ shunt to detect >5 A faults with 2 mV hysteresis preventing oscillation during charge termination. Use Value: 2 mV hysteresis setting and 135 µA IQ enable precise, low-power protection without compromising charger efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA301AIDSQR | Includes integrated 10-bit ADC and I²C interface; higher quiescent current (350 µA); same pinout and threshold programming. | Requires microcontroller with I²C and firmware support for digital readback; not suitable for simple alert-only use cases. | Select INA301AIDSQR only if digital current telemetry and programmable alert registers are required. |
| MAX40056AUTA+ | Fixed 50 mV threshold; no resistor programming; 2.5 V to 5.5 V supply; 250 ns propagation delay; no hysteresis selection. | Designed for ultra-fast short-circuit detection in GaN FET gate drivers; lacks configurability for variable trip points. | Choose MAX40056AUTA+ only for sub-1 µs fault response where fixed threshold suffices and layout space is constrained. |
Compared with INA300AIDSQR, INA301AIDSQR adds telemetry capability at cost of higher IQ and firmware dependency, while MAX40056AUTA+ trades configurability for nanosecond-speed response - making INA300AIDSQR optimal for balanced, flexible overcurrent protection in power conversion systems.
Availability
INA300AIDSQR is available at Aetrix Electronics and suitable for server VRMs, industrial AC/DC power supplies, and telecom rectifiers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for INA300AIDSQR 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 chain and power management solutions.
The INA300AIDSQR belongs to TI's current-sense comparator product line, engineered specifically for robust, low-component-count overcurrent protection in high-reliability power systems - emphasizing accuracy, noise immunity, and wide common-mode operation.
FAQ
What is the maximum common-mode voltage supported by the INA300AIDSQR?
The INA300AIDSQR supports a common-mode input voltage range of 0 V to 36 V, independent of its 2.7 V to 5.5 V supply voltage. This allows direct high-side shunt sensing in 12 V, 24 V, and 36 V systems without external level-shifting circuitry. The specification is validated across the full –40°C to +125°C operating temperature range per TI SBOS613C datasheet Section 6.5.
How is the overcurrent threshold programmed on the INA300AIDSQR?
The INA300AIDSQR threshold is programmed using a single external resistor (RLIMIT) connected from the LIMIT pin to GND. An internal 20 µA current source develops VLIMIT = 20 µA × RLIMIT, which is compared to the shunt voltage. For example, a 10 kΩ resistor sets a 200 mV threshold. Voltage-source programming is also supported via DAC or reference, as detailed in Section 7.3.2 of the INA300AIDSQR datasheet.
Does the INA300AIDSQR support latched fault output behavior?
Yes, the INA300AIDSQR supports both latched and transparent alert modes. When the LATCH pin is driven high, the ALERT output remains low after an overcurrent event until the LATCH pin is toggled or the device is power-cycled. In transparent mode (LATCH = low), ALERT follows the input state in real time. This dual-mode capability simplifies fault-handling architecture in systems with or without dedicated reset logic.
What are the power consumption characteristics of the INA300AIDSQR in active and disabled states?
In active operation, the INA300AIDSQR draws ≤135 µA at 25°C and ≤150 µA across –40°C to +125°C. When the ENABLE pin is low, quiescent current drops to ≤3.5 µA, and input bias current falls to ≤500 nA - enabling ultra-low-power standby modes. These values are specified in Section 6.5 Electrical Characteristics of the INA300AIDSQR datasheet and verified across all delay and hysteresis configurations.
Which package does the INA300AIDSQR use, and what are its thermal characteristics?
The INA300AIDSQR uses the 10-pin WSON (DSQ) package with 2.00 mm × 2.00 mm body size and exposed thermal pad. Its junction-to-ambient thermal resistance (RθJA) is 63.5°C/W with standard JEDEC 2-layer board layout. The thermal pad must be soldered to a copper pour for optimal performance, as defined in TI's thermal design guidelines for DSQ packages in the INA300AIDSQR datasheet Section 6.4.
INA300AIDSQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current Sense
- Sensing Method:
- High/Low-Side
- Accuracy:
- -
- Voltage - Input:
- 2.7V ~ 5.5V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WSON (2x2)
INA300AIDSQR FAQ
1.How can I place an order for INA300AIDSQR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA300AIDSQR 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 INA300AIDSQR reliable?
The price and inventory of INA300AIDSQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA300AIDSQR is usually 5 days.
3.What payment methods are accepted for INA300AIDSQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA300AIDSQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA300AIDSQR?
INA300AIDSQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA300AIDSQR 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 INA300AIDSQR?
For technical support, including INA300AIDSQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA300AIDSQR requirements.
6.How does Aetrix verify that INA300AIDSQR is sourced from the original manufacturer or authorized distributors?
All INA300AIDSQR 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 INA300AIDSQR meets industry standards.
7.What is the process for return or replacement of INA300AIDSQR?
All INA300AIDSQR units undergo pre-shipment inspection (PSI). If there is an issue with INA300AIDSQR, 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 INA300AIDSQR part is unused and in its original packaging.
Return procedure for INA300AIDSQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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