PNP or NPN, 3-wire vs AC/DC, 2-wire
PNP and NPN are the best technical options. Because of product availability, PNP is the best choice of the two.
AC/DC 2-wire interface issues can arise from the leakage current. Some loads (ones with small current demands) are not able to turn off due to this leakage current.
PNP or NPN, 3-wire
– Fewer interface problems
– Largest selection
– Lowest unit costs
AC/DC, 2-wire
– Many interface issues
– Smaller selection
– Susceptible to noise
