The LM397 device is a single voltage comparator with an input common mode that includes
ground. The LM397 is designed to operate from a single 5-V to 30-V power supply or a split power
supply. Its low supply current is virtually independent of the magnitude of the supply
The LM397 features an open-collector output stage. This allows the connection of an
external resistor at the output. The output can directly interface with TTL, CMOS and other logic
levels, by tying the resistor to different voltage levels (level translator).
The LM397 is available in the space-saving 5-Pin SOT-23 package and is pin-compatible to
TI’s TL331, a single differential comparator.
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