LP311DR

Overview

The LP311DR is a low-power differential comparator manufactured by Texas Instruments, housed in an 8-pin SOIC package. It operates from supply voltages ranging from 3.5 V to 30 V or dual supplies of ±1.75 V to ±15 V. The device features a typical response time of 1.2 μs and offers an output drive capability of 25 mA. Electrical characteristics include a maximum input offset voltage of 7.5 mV at 25°C and a typical bias current of 15 nA. It is characterized for operation within a temperature range of 0°C to 70°C.

Feature Summary

• Low power consumption with a typical drain of 900 μW at a 5-V supply
• Strobe capability allows the output to be turned off regardless of input states
• Offset balancing feature minimizes input offset voltage
• Emitter output can swing below the negative supply rail

Applications

• Battery-powered applications requiring low current drain
• General-purpose analog signal comparison
• Threshold detection circuits where fast response is not critical

Procurement Notes

Verify that the specific orderable part number matches the required package type and reel quantity. Confirm the operating temperature range aligns with the application environment, as the LP311 series is rated for 0°C to 70°C. Ensure compatibility with existing PCB footprints designed for the standard LM311 pinout. Check for RoHS compliance status if environmental regulations apply to the final product assembly.

Selection Notes

Select the LP311DR when a balance between low power consumption and adequate speed is required. It serves as a direct pin-compatible replacement for the LM311, offering significantly reduced power usage at the cost of slower response time. Consider this component for designs where minimizing standby current is a priority over high-speed switching performance.

Part Context

The LP311 is part of a family of low-power differential comparators developed by Texas Instruments. It shares the same pinout and functionality as the industry-standard LM311 but utilizes ion-implanted resistors to achieve a substantial reduction in power consumption. This design makes it suitable for applications where energy efficiency is more important than rapid signal processing speeds.

Replacement Considerations

LP311D

FAQ

How does the LP311 differ from the LM311?

The LP311 is a low-power version of the LM311. It consumes approximately 30 times less power but has a response time that is roughly six times slower.

What is the function of the strobe pin?

Pulling the strobe pin low turns off the output regardless of the input states. It should be current driven rather than shorted directly to ground.