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by marshray
1380 days ago
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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. |
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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?