LM2903QDGKRQ1 Dual Comparator

Updated: 2026-09-25

Overview

The LM2903QDGKRQ1 is a dual differential comparator manufactured by Texas Instruments, designed specifically for automotive applications. It operates over a wide voltage range (2V to 36V) and features low supply current, making it suitable for battery-powered systems. The device is qualified for automotive environments, meeting AEC-Q100 standards for reliability. This comparator is housed in a compact VSSOP-8 package, offering space efficiency for PCB designs. Its open-drain outputs allow flexible interfacing with other logic circuits. The LM2903QDGKRQ1 is widely used in automotive control systems, power management, and signal conditioning applications due to its robust performance and durability.

Structure and Working Principle

The LM2903QDGKRQ1 consists of two independent comparators with a common power supply. Each comparator compares two input voltages and generates a digital output based on the difference. The open-drain output stage requires an external pull-up resistor to provide a logic-level output. The device operates by amplifying the voltage difference between the inverting and non-inverting inputs. When the non-inverting input voltage exceeds the inverting input, the output goes high (if pulled up). The comparator's response time is optimized for automotive applications, ensuring reliable performance in noisy environments.

Key Features

The LM2903QDGKRQ1 offers several key advantages for automotive and industrial applications. Its wide supply voltage range (2V to 36V) accommodates various system requirements. The low supply current (typically 0.4mA per comparator) makes it ideal for power-sensitive designs. Other notable features include input common-mode voltage range extending to ground, low input bias current, and ESD protection up to 2kV. The device's automotive qualification ensures operation over a temperature range of -40°C to +125°C, making it suitable for harsh environments. These features combine to provide reliable voltage comparison in demanding applications.

Application Areas

The LM2903QDGKRQ1 finds extensive use in automotive electronics, including battery management systems, motor control units, and sensor interfaces. Its robust design makes it suitable for under-the-hood applications where temperature extremes and vibration are common. In industrial applications, the comparator is used in power supply monitoring, level detection, and window comparator circuits. Consumer electronics applications include over-voltage protection circuits and battery-powered devices. The device's versatility and reliability make it a preferred choice for designers across multiple industries.

Maintenance and Precautions

Proper handling and installation are crucial for optimal performance of the LM2903QDGKRQ1. Always observe ESD precautions during handling to prevent damage to the sensitive inputs. The device should be stored in anti-static packaging when not in use. When designing with this comparator, ensure the power supply voltage does not exceed the absolute maximum rating. Input voltages should remain within the specified common-mode range. For reliable operation in automotive applications, follow PCB layout guidelines to minimize noise and ensure proper thermal management.

B2B Procurement Guide

When procuring LM2903QDGKRQ1 comparators, verify the automotive qualification (AEC-Q100) and temperature grade (Grade 1) to ensure suitability for your application. Consider ordering from authorized distributors to guarantee genuine parts and reliable supply chains. For volume purchases, negotiate pricing based on quantity breaks. Lead times can vary, so plan procurement accordingly. Always check for the latest datasheet revisions to confirm specifications. Alternative packaging options (tape and reel) may be available for automated assembly processes.