3 ms·
In "on" mode, FETs appear as a small resistance R_ds_on, but BJTs act like a mostly-constant voltage drop V_ce_sat. So for any BJT and FET we compare, passing
by marshray 4y ago
In "on" mode, FETs appear as a small resistance R_ds_on, but BJTs act like a mostly-constant voltage drop V_ce_sat.
So for any BJT and FET we compare, passing a current less than V_ce_sat/R_ds_on is more efficient on the FET, and for greater currents the BJT is more efficient.
- baybal2 4y ago> for greater currents the BJT is more efficient Depending on voltage. Extremely low RDs ON FETs are there. The real world choice would depend on whether you just need a constantly open switch, or high frequency switching for power conversion. Are you in power electronics?