Basic Equations For The BJT

For npn: VB > VE + 0.6 V

For pnp: VBE – 0.6 V

For both npn and pnp anytime

IE = IC + IB

For both npn and pnp only in the active region

IC = h FE IB = ß IB

IE = IC+ IB = (ß+1) IB ~ ß IB