LM311DR

Overview

The LM311DR is a high-speed differential comparator manufactured by Texas Instruments in an 8-SOIC surface-mount package. It operates within a supply voltage range of 3.5V to 30V (single) or ±1.75V to ±15V (dual). Key electrical specifications include a maximum input offset voltage of 7.5mV at ±15V, a maximum input bias current of 250nA, and a typical response time of 115ns. The device draws a maximum static current of 7.5mA and supports output configurations including MOS, open-collector, open-emitter, and TTL compatibility.

Feature Summary

• Features integrated strobe functionality for precise timing control
• Provides versatile output options compatible with multiple logic families
• Supports single or dual power supply configurations

Applications

• High-speed analog-to-digital converter interfaces
• Voltage monitoring and level detection circuits
• Phase-locked loop (PLL) frequency discriminators

Procurement Notes

Verify the specific suffix 'DR' corresponds to the tape-and-reel packaging format required for automated assembly processes. Confirm that the component meets RoHS3 compliance standards as indicated in official documentation. Ensure the operating temperature range aligns with the specified commercial grade limits of 0°C to 70°C for the intended application environment.

Selection Notes

Select this component when a differential input configuration with strobe capability is required. Consider the 115ns propagation delay for speed-sensitive designs. Evaluate the open-collector/open-emitter outputs against system logic voltage requirements. Verify that the 7.5mV offset voltage specification meets the precision needs of the signal conditioning stage.

Part Context

This part belongs to the LM311 family of comparators, which are widely used in industrial and consumer electronics. The 'DRE4' variant denotes a lead-free, RoHS-compliant version in an SOIC package, while the 'DR' suffix specifically indicates reel packaging. The device serves as a standard solution for general-purpose comparison tasks requiring moderate speed and flexible output drive capabilities.

Replacement Considerations

Cross-reference with LM311DRG4 for identical functional specifications with potentially different manufacturing lot codes or minor packaging variations. Verify pinout compatibility before substituting with other LM311 variants such as LM311N or LM311PWR.