The Texas Instruments LM311DRE4 is a general-purpose comparator in an 8-SOIC package, designed for single or dual supply operation from 3.5 V to 30 V (or ±1.75 V to ±15 V). It outputs MOS, open-collector, open-emitter, or TTL-compatible levels, making it a flexible choice for level detection, zero-crossing detectors, and pulse-width modulators in commercial-temperature (0°C to 70°C) environments.
Supply range and output flexibility
The wide supply range — 3.5 V to 30 V single, or ±1.75 V to ±15 V dual — lets this comparator work across 5 V logic rails, 12 V industrial supplies, or ±15 V op-amp rails without a separate regulator. The output stage can be wired as open-collector, open-emitter, or TTL, which directly drives logic inputs or relays without extra level shifting.
Package and sourcing note
The LM311DRE4 is the tape-and-reel variant of the standard LM311 in an 8-SOIC package. The base product number is LM311, so any LM311-series datasheet applies — confirm the suffix for packaging (DRE4 = tape and reel).