Texas Instruments

LM311DRG4

LM311DRG4 Description

The LM311DRG4 from Texas Instruments is a general-purpose voltage comparator in an 8-SOIC surface-mount package, designed for precision analog signal comparison. Operating within a wide supply voltage range (3.5V–30V single or ±1.75V–15V dual), it delivers robust performance in industrial and consumer applications. With a low input offset voltage (max 7.5mV @ ±15V) and minimal input bias current (0.25µA @ ±15V), it ensures high accuracy in signal detection. The device is RoHS3 compliant and REACH unaffected, making it suitable for environmentally conscious designs. Though marked obsolete, it remains a reliable choice for legacy systems due to its proven stability and low quiescent current (max 7.5mA).

LM311DRG4 Features

• Wide Voltage Range: Supports single (3.5V–30V) or dual (±1.75V–15V) supplies for flexible integration.
• Low Power Consumption: Quiescent current ≤7.5mA enhances energy efficiency.
• High Precision: Input offset voltage ≤7.5mV and bias current ≤0.25µA ensure accurate comparisons.
• Robust Packaging: 8-SOIC with MSL 1 (Unlimited) rating for moisture resistance.
• Industrial Durability: Operates from 0°C to 70°C, suitable for harsh environments.
• Output Flexibility: Open-collector output allows easy interfacing with logic circuits.

LM311DRG4 Applications

• Threshold Detection: Ideal for overvoltage/undervoltage monitoring in power supplies.
• Zero-Crossing Circuits: Used in AC phase control and motor drives.
• Analog-to-Digital Interfaces: Acts as a front-end comparator for ADCs.
• Pulse Generators: Timing applications in oscillators and waveform shaping.
• Legacy System Maintenance: Replaces older comparators in industrial controls and instrumentation.

Conclusion of LM311DRG4

The LM311DRG4 excels in precision, versatility, and reliability, making it a go-to for analog comparison tasks despite its obsolete status. Its wide supply range, low power, and robust design cater to demanding applications like power management and signal conditioning. While newer alternatives exist, the LM311DRG4 remains a cost-effective solution for legacy upgrades or designs requiring proven performance. Engineers value its simplicity, accuracy, and compatibility with both analog and digital systems.