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LM311H/NOPB

TILM311H/NOPB

Texas Instruments
Analog Comparators Hi Perf Volt Comp
183 in stock
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Overview

The LM311H/NOPB is a high-performance voltage comparator designed to operate over a wide range of supply voltages from standard 15V op-amp supplies down to a single 5V logic supply. It features a flexible output stage with an open-collector transistor that can drive loads referred to ground, the negative supply, or the positive supply. This specific variant is housed in a TO-99 (TO-5-8) metal can package, offering robust thermal performance and shielding for precision analog applications.

Why Choose This Part

The LM311H offers exceptional versatility with its ability to interface directly with RTL, DTL, and TTL logic levels. Its input offset current and bias current are significantly lower than standard comparators, making it suitable for high-impedance signal sources. The TO-99 metal can package provides superior environmental protection and heat dissipation compared to plastic alternatives.

Applications

Zero-Crossing Detectors
Converting sine waves or other AC signals into digital pulses at the zero-voltage point for timing and synchronization.
Window Comparators
Monitoring a voltage signal to determine if it falls within a specific upper and lower threshold range.
Lamp and Relay Drivers
Directly driving loads up to 50mA and 50V using the integrated output transistor.
Pulse Generators
Creating precise timing pulses or square waves in oscillator and multivibrator circuits.

Getting Started

When designing with the LM311H, ensure that the output collector and emitter pins are correctly biased, as the output is an uncommitted transistor. Use a pull-up resistor for standard logic interfacing and include decoupling capacitors (0.1uF) near the supply pins to prevent oscillations during transitions. For prototyping, specialized TO-99 to DIP adapters or circular-pattern breadboards are required due to the pin circle geometry.