Mostly electron current carriers are more mobile than hole current carriers, resulting in a faster transistor.
npn is preferred to pnp since n-doping can be pushed to higher values without damaging silicon lattice. due to this fact, doped regions can be less resistive. difference between npn and pnp is becoming smaller and smaller, tho.
pnp answer
diff. between npn and pnp transristor
pnp and npn transistor
NPN and PNP are transistor types. The difference in the way the layers of semiconductor material are doped with impurities.
BT169 is neither an NPN nor a PNP transistor. BT169 is a thyristor, otherwise known as a silicon controlled rectifier.
NPN, PNP only classified to BJT, while FET classified as P-channel , N-channel
pnp
Switching is faster in NPN transistor than PNP. Because movement of electrons is faster than holes.
PNP is sourcing. NPN is sinking. You generally connect NPN to ground and your PLC(or any load)input. With PNP you connect to V+ and to your PLC. Your PLC (load) should have the same ground or V+. Sourcing (PNP) provides a path to +24DC generally. Sinking (NPN) provides a path to 0V DC.
no
To save a decoupling capacitor & biasing resistors for the PNP.