National Semiconductor

LM311D

LM311D Description

The LM311D is a general-purpose comparator designed by National Semiconductor, known for its robust performance and versatility. This single-element comparator operates within a temperature range of 0°C to 70°C, making it suitable for a variety of industrial and commercial applications. The LM311D is housed in a surface-mount package, specifically an 8-pin small outline integrated circuit (SOIC), which facilitates easy integration into compact electronic designs.

LM311D Features

The LM311D offers several key technical specifications that set it apart from similar comparator models. It features a low input offset voltage of up to 7.5mV at ±15V, ensuring high accuracy in voltage comparisons. The input bias current is also minimal, with a maximum of 0.25µA at ±15V, which helps maintain stable performance even under varying conditions. The quiescent current is kept low at a maximum of 7.5mA, contributing to energy efficiency.

The LM311D supports a wide supply voltage range, operating from 3.5V to 30V for single supply and ±1.75V to ±15V for dual supply. This flexibility allows it to be used in a broad range of electronic systems with different power supply requirements. The device is also compliant with the Export Administration Regulations (EAR99) and classified under the Harmonized Tariff Schedule of the United States (HTSUS) code 8542.39.0001.

LM311D Applications

The LM311D is ideal for applications requiring precise voltage level detection and comparison. It is commonly used in signal processing circuits, where it can accurately compare input signals to a reference voltage and generate a corresponding output signal. This makes it suitable for use in analog-to-digital converters, overvoltage protection circuits, and pulse-width modulation (PWM) controllers.

In industrial settings, the LM311D can be employed in motor control systems to monitor and regulate motor speed and direction. It is also used in power supply circuits to ensure stable voltage levels and protect against voltage surges. The comparator's low power consumption and wide operating voltage range make it a reliable choice for battery-operated devices and portable electronics.

Conclusion of LM311D

Despite being marked as obsolete, the LM311D remains a valuable component for engineers and designers due to its reliable performance and versatile capabilities. Its low input offset voltage, minimal input bias current, and wide supply voltage range make it a robust choice for a variety of applications. While newer models may offer additional features, the LM311D's proven track record and compatibility with existing systems ensure its continued relevance in the electronics industry.