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What and why is 2N3904 BJT transistor? (Read 587 times)
neoflash
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What and why is 2N3904 BJT transistor?
Jun 06th, 2020, 10:44am
 
I googled and it is a typical transistor BJT. But what do the number and symbol stands for?

Thanks!
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Ken Kundert
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Re: What and why is 2N3904 BJT transistor?
Reply #1 - Jun 6th, 2020, 12:32pm
 
It is a JEDEC number. JEDEC is a standards body for the US. Europe and Japan both have their own naming schemes.

2n signifies a transistor. 3904 is just assigned sequentially.  2N3904 happens to be a fairly popular transistor. 2N2222 is the JEDEC number of another very popular transistor.

See JEDEC Numbering.

-Ken
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« Last Edit: Jun 6th, 2020, 3:11pm by Ken Kundert »  
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neoflash
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Re: What and why is 2N3904 BJT transistor?
Reply #2 - Jun 6th, 2020, 4:47pm
 
Ken Kundert wrote on Jun 6th, 2020, 12:32pm:
It is a JEDEC number. JEDEC is a standards body for the US. Europe and Japan both have their own naming schemes.

2n signifies a transistor. 3904 is just assigned sequentially.  2N3904 happens to be a fairly popular transistor. 2N2222 is the JEDEC number of another very popular transistor.

See JEDEC Numbering.

-Ken


Great knowledge Ken. MMBT3904 what does MMBT stand for?
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Andrew Beckett
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Re: What and why is 2N3904 BJT transistor?
Reply #3 - Jun 7th, 2020, 1:00am
 
I believe this is just a prefix used by a different manufacturer. MMBT is (I think) used by On Semi (probably coming from one of their many acquisitions over the years). Other prefixes used are discussed in this post

So I think it's another manufacturer's implementation of a common generic device.

Andrew.
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