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2N2222 vs. 2N3904 NPN Transistors [message #79] Sat, 30 September 2006 12:09
kc2nda is currently offline  kc2nda
Messages: 44
Registered: December 2004
Location: New Paltz
>Can you pretty much interchangeably use 2n2222 and 2n3904 transistors?

No. They are intended for rather different purposes. The 2N2222 has an Ic max of 800mA (metal case, the PN2222 has less current capabilities), while the 2N3904 has something like 300mA Ic max. Pt also differ. The 2N3904 is a higher speed and generally lower noise device as well.

The 2N2222 is a medium-low power switch with higher input and output capacitances. The 2N3904 is a low power switch with lower noise and higher Ft.

Hfe is about the same for both.

BUT, if all you are doing is driving LEDs, then such considerations
don't matter.
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