LP311D

Overview

The LP311D is a low-power differential comparator manufactured by Texas Instruments in an 8-pin SOIC package. It operates from supply voltages ranging from 3.5 V to 30 V, with a typical power drain of 900 μW at a 5-V supply. The device features a response time of 1.2 μs and can drive loads up to 25 mA. Input characteristics include a maximum offset voltage of 7.5 mV and input bias currents as low as 15 nA. It supports both single and dual supply configurations.

Feature Summary

• Low-power operation suitable for battery-powered applications
• Strobe capability to disable the output regardless of input states
• Offset balancing functionality to minimize input offset voltage
• Wide common-mode input range compatible with various supply levels

Applications

• Battery-powered electronic systems
• Threshold detection circuits
• Voltage monitoring applications
• General-purpose analog signal comparison

Procurement Notes

Verify that the specific orderable part number matches the required package type and tube quantity. Confirm RoHS compliance status and lead finish specifications against current production data sheets. Ensure the operating temperature range aligns with the intended environmental conditions before finalizing procurement.

Selection Notes

Select the LP311D when reduced power consumption is prioritized over high-speed switching, as it offers a slower response time compared to standard LM311 variants. Consider the strobe pin functionality if output disabling is required. Verify that the 25 mA output drive capability meets the load requirements of the target circuit design.

Part Context

The LP311D belongs to the LP311 family of low-power differential comparators. It shares the same pinout as the industry-standard LM311 but utilizes ion-implanted resistors to achieve significantly lower power consumption. This family is designed for applications where fast response times are not critical, offering a trade-off between speed and energy efficiency.

Replacement Considerations

The LP311D is functionally interchangeable with the LM311 series due to identical pinouts. For direct replacements within the low-power category, consider the LP211D, which shares similar electrical characteristics but is characterized for a wider temperature range of -25°C to 85°C.