LM311N in LM339 / LM393 Comparators Family
The LM311N family consists of high-speed voltage comparators designed to operate over a wide range of supply voltages, from standard ±15V op-amp rails down to single 5V logic supplies. Originally popularized by National Semiconductor and now maintained by Texas Instruments and others, these components are engineered to drive RTL, DTL, TTL, or MOS logic levels. They feature a flexible output stage capable of switching voltages up to 50V and currents up to 50mA, making them essential for interfacing between analog signals and digital processing units.
Variants in This Sub-Family
Variants within the LM311 sub-family primarily differ by temperature grade and packaging. The 'N' suffix typically denotes a Plastic Dual-In-Line Package (PDIP), while 'D' or 'DR' variants indicate Small Outline (SOIC) footprints for surface-mount applications. Performance differences are usually centered on operating temperature ranges, such as the commercial LM311 versus the military-grade LM111, or specific lead-free compliance like the NOPB (No Pb/Lead) designation from Texas Instruments.
