Texas Instruments INA300AQDGSRQ1

Overview

INA300AQDGSRQ1 from Texas Instruments is an automotive-grade, high-common-mode current-sense comparator designed for overcurrent protection in power rails. It operates from 2.7 V to 5.5 V supply, supports 0 V to 36 V common-mode input range, delivers ±500 µV max offset voltage, offers selectable 10/50/100 µs response times, and features open-drain latched alert output - deployed in body control modules for real-time shunt-based fault detection.

For engineers reviewing the INA300AQDGSRQ1 datasheet, INA300AQDGSRQ1 pinout, INA300AQDGSRQ1 application, or INA300AQDGSRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (–40°C to +125°C), programmable 0–250 mV threshold via single resistor, 2/4/8 mV selectable hysteresis, and 135 µA max active quiescent current - critical for low-power automotive safety-critical monitoring.

Technical Context

The INA300AQDGSRQ1 integrates a precision current-sense amplifier and comparator in one die, eliminating external amplification for overcurrent detection. Its internal 20 µA LIMIT terminal current source enables resistor-programmed trip thresholds, while DELAY, HYS, and LATCH pins configure timing, noise immunity, and alert persistence without external logic.

It uses a fixed-gain, rail-to-rail input architecture with 100–120 dB common-mode rejection across –40°C to +125°C, and supports transparent or latched alert modes via dedicated digital inputs - enabling robust operation in noisy 12 V/24 V automotive power domains where shunt voltages remain below 250 mV.

Key Specifications

Pinout & Package

VSSOP-10 package (3.00 mm × 3.00 mm), thermally enhanced for automotive under-hood placement; 0.5-mm pitch, exposed thermal pad optional per TI design guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA300AQDGSRQ1, INA301AQDGSRQ1 simplifies board layout with integrated pull-up but offers no functional upgrade, while MAX40056ATA+T trades latch capability and automotive qualification for broader voltage range and tighter offset - making it suitable only for non-latched, non-automotive designs requiring >36 V support.

Availability

INA300AQDGSRQ1 is available at Aetrix Electronics and suitable for body control modules, motor control units, valve drivers, and central control modules requiring stable component supply across automotive production lifecycles.

Supply support for INA300AQDGSRQ1 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 deep expertise in automotive electronics and functional safety solutions.

The INA300-Q1 product line was engineered specifically for AEC-Q100-compliant overcurrent protection in 12 V/24 V automotive power domains, emphasizing low IQ, wide common-mode tolerance, and configurable timing/hysteresis for robust shunt-based fault detection.

FAQ

What is the operating temperature range for the INA300AQDGSRQ1?

The INA300AQDGSRQ1 is qualified for automotive Grade 1 operation, with a specified ambient operating temperature range of –40°C to +125°C. This rating is validated per AEC-Q100 standards and applies across all electrical parameters in the datasheet, including offset voltage drift (≤0.5 µV/°C) and common-mode rejection (≥100 dB). The device maintains full functionality within this range without derating, making it suitable for under-hood and cabin ECU deployments.

How is the overcurrent threshold programmed on the INA300AQDGSRQ1?

The INA300AQDGSRQ1 overcurrent threshold is programmed using a single external resistor (RLIMIT) connected between the LIMIT pin and ground. An internal 20 µA current source flows through RLIMIT to generate the threshold voltage (VLIMIT = 20 µA × RLIMIT). For example, a 10 kΩ resistor sets VLIMIT = 200 mV, corresponding to a 200 mV shunt voltage trip point. The INA300AQDGSRQ1 supports thresholds from 0 mV to 250 mV, and the NAF term (500 µV) adjusts for noise only at the 10 µs delay setting.

Does the INA300AQDGSRQ1 support latch mode for the ALERT output?

Yes, the INA300AQDGSRQ1 supports latch mode via the LATCH pin. When LATCH is driven high, the ALERT output remains asserted (low) after an overcurrent event until the LATCH pin is toggled low - enabling persistent fault indication across MCU resets or power cycles. In transparent mode (LATCH low), ALERT follows the input state in real time. This dual-mode capability is integral to the INA300AQDGSRQ1's architecture and requires no external components.

What is the maximum common-mode voltage the INA300AQDGSRQ1 can handle?

The INA300AQDGSRQ1 supports a common-mode input voltage range of 0 V to 36 V - verified across the full –40°C to +125°C temperature range. This specification applies independently of the 2.7 V to 5.5 V supply voltage (VS), allowing direct connection to 12 V or 24 V battery rails while measuring mV-level shunt voltages. Input protection limits differential voltage to ±40 V and common-mode to 40 V absolute maximum, but functional operation is guaranteed only within the 0–36 V range.

Is the INA300AQDGSRQ1 pin-compatible with other devices in the same family?

Yes, the INA300AQDGSRQ1 is pin-compatible with the INA301AQDGSRQ1 and INA302AQDGSRQ1 in the VSSOP-10 (DGS) package. All three share identical pin functions, electrical specifications, and thermal characteristics. The primary distinction is that the INA301AQDGSRQ1 integrates a 100-kΩ pull-up resistor on the ALERT pin, while the INA300AQDGSRQ1 requires an external pull-up. No PCB changes are needed when migrating between these variants, provided the external pull-up is omitted for the INA301AQDGSRQ1.