Texas Instruments INA300AIDSQT

Overview

INA300AIDSQT from Texas Instruments is a precision overcurrent-protection current-sense comparator that detects fault conditions by comparing shunt voltage against a programmable threshold. It operates with 0 V to 36 V common-mode input range, ±500 µV max offset voltage, 10–100 µs selectable response time, and supports latched or transparent alert output-used in server power rails and telecom DC/DC modules.

For engineers reviewing the INA300AIDSQT datasheet, INA300AIDSQT pinout, INA300AIDSQT application, or INA300AIDSQT equivalent, key selection criteria include its 2.7–5.5 V supply compatibility, 2 mV/4 mV/8 mV hysteresis options, single-resistor threshold programming, open-drain ALERT output, and operation across –40°C to +125°C.

Technical Context

The INA300AIDSQT integrates a high-accuracy differential input stage with internal 20 µA LIMIT current source for resistor-based threshold setting, enabling precise trip-point configuration from 0 mV to 250 mV. Its comparator core features programmable delay (10/50/100 µs) and hysteresis (2/4/8 mV), directly addressing noise immunity and response-speed trade-offs in high-dV/dt power systems.

It uses digital control inputs (DELAY, HYS, LATCH, ENABLE) to configure timing, hysteresis, latch mode, and disable state-allowing dynamic adaptation without external logic. The open-drain ALERT output supports both transparent and latched behavior, with propagation delay tightly specified per delay setting (e.g., 10 µs typ. at 10 µs mode).

Key Specifications

Pinout & Package

INA300AIDSQT is packaged in a 10-pin WSON (DSQ) package measuring 2.00 mm × 2.00 mm with exposed thermal pad. This compact, thermally enhanced package supports high-density PCB layouts in space-constrained power management subsystems.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar overcurrent-protection comparator applications.

Compared with INA301AIDSQT, INA300AIDSQT provides full external pull-up control for voltage-level flexibility; compared with MAX40056AUTA+, it delivers superior accuracy (±500 µV vs ±1.5 mV), configurable hysteresis, and adjustable delay-making it optimal for precision overcurrent protection in regulated power systems.

Availability

INA300AIDSQT is available at Aetrix Electronics and suitable for server power rail monitoring, telecom DC/DC module protection, and industrial PLC power supply monitoring requiring stable component supply and long-term production continuity.

Supply support for INA300AIDSQT 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 INA300 family was designed specifically for high-reliability overcurrent protection in power-constrained, noise-sensitive systems-targeting servers, telecom infrastructure, and industrial power supplies where accuracy, configurability, and thermal robustness are critical.

FAQ

What is the maximum common-mode voltage the INA300AIDSQT can handle?

The INA300AIDSQT supports a common-mode input voltage range of 0 V to 36 V, independent of its 2.7–5.5 V supply voltage. This allows direct high-side current sensing on 12 V, 24 V, or 36 V rails without external level-shifting circuitry-enabling simplified, cost-effective overcurrent detection in INA300AIDSQT-based designs.

How is the current-limit threshold set on the INA300AIDSQT?

The INA300AIDSQT threshold is set using an external resistor connected between the LIMIT pin and ground. An internal 20 µA current source develops a voltage across this resistor, establishing the trip point from 0 mV to 250 mV. For example, a 10 kΩ resistor sets V_LIMIT = 200 mV, corresponding to a 200 mV shunt voltage threshold in INA300AIDSQT applications.

Does the INA300AIDSQT support latched fault indication?

Yes-the INA300AIDSQT's ALERT output can be configured in latched mode via the LATCH pin. When LATCH is high, the ALERT pin remains asserted after overcurrent detection until the condition is cleared externally (e.g., by toggling ENABLE). This behavior is essential for fault logging in unattended systems and is fully supported in all operating conditions of the INA300AIDSQT.

What are the hysteresis options available on the INA300AIDSQT?

The INA300AIDSQT offers three hardware-selectable hysteresis levels: 2 mV (HYS floating), 4 mV (HYS grounded), and 8 mV (HYS tied to VS). These settings stabilize comparator operation near the threshold under noisy conditions-particularly valuable in switch-mode power supplies where dI/dt-induced transients could cause false trips in INA300AIDSQT deployments.

Can the INA300AIDSQT operate from a 3.3 V supply?

Yes-the INA300AIDSQT is fully specified for operation from 2.7 V to 5.5 V, including standard 3.3 V logic supplies. At 3.3 V, it maintains ±500 µV max offset voltage, 135 µA max quiescent current, and full functionality across all digital control pins (DELAY, HYS, LATCH, ENABLE), making it ideal for integration into 3.3 V microcontroller-based INA300AIDSQT monitoring systems.