0
\$\begingroup\$

There exists this qeustion about MOSFET advantages over BJT's Linear Regulator: MOSFET vs BJT

So my question is: What advantages do BJT's have over MOSFETS ?

So far I have these advantages:

  • They operate better under high load than MOSFETS
  • They operate better with higher frequencies than MOSFETS

What else did I miss ?

\$\endgroup\$
6
  • 2
    \$\begingroup\$ It might be more relevant to compare a BLT to a Bolgna sandwich considering the millions of different varieties of transistors , circuits , topography , substrates and doping. For LDO's MOSFETs have lower bias current, lower dropout from lower RdsOn , and smaller packages but require constraints on Cap ESR for stable regulation. \$\endgroup\$
    – Tony Stewart EE75
    Aug 22, 2017 at 21:05
  • 5
    \$\begingroup\$ What is better .. a Nail or a Screw.. They both can be used for the same thing, but are very different. Which is better when is really application dependent. Voting to close as too broad. \$\endgroup\$
    – Trevor_G
    Aug 22, 2017 at 21:13
  • 1
    \$\begingroup\$ See: global.oup.com/us/companion.websites/fdscontent/uscompanion/us/… \$\endgroup\$
    – jonk
    Aug 22, 2017 at 21:18
  • 1
    \$\begingroup\$ BJT's non-saturation region is good for analog amplification, BJTs have (potentially) a lower "on voltage" than VGSth, BJTs are cheaper and less static-sensitive. \$\endgroup\$
    – dandavis
    Aug 22, 2017 at 21:44
  • \$\begingroup\$ @Trevor I can see your point but there has to be something that the BJT can do that MOSFET's cant do, much like a nail can be hammered in with any solid object while a screw required "specialized equipment" \$\endgroup\$
    – zython
    Aug 22, 2017 at 22:03

2 Answers 2

Reset to default
3
\$\begingroup\$

BJT generally offers more gain and higher fidelity in the linear region than FET

\$\endgroup\$
1
\$\begingroup\$

They can be considerably less expensive for equivalent functionality.

For higher voltages, BJTs can be a better choice, for example the MPSA42/MMBTA42 for switching 100s of volts at low current. Many CCFL lamps use BJTs (eg. MJE13003) for that reason.

\$\endgroup\$

Not the answer you're looking for? Browse other questions tagged or ask your own question.