BETADifferential decision
The input stage responds to the difference between the two voltages.
Quad differential comparator
LM339 Internal Circuitry
Explore the internal circuitry and functional stages of LM339.
Package view
Inside LM339
Four differential comparators, each with an open collector.
Explore the circuit
Select a stage to see its role and connections
Open collector
The output transistor either sinks current or releases the node.
Four independent channels
Each comparator has separate inputs and output, with a common supply.