need help on BC337

[Jpop]

do u guys know any replacement transistor for BC337?

the circuit wherein this is transistor is used is in this link: http://www.redcircuits.com/Page64.htm

[Guest SM2GXN]

Hi Jpop!

Replacement for BC337: BC637, BC639 and a Japanese 2SD667

[Jpop]

do u know any 2n**** transistors that could replace this, because the only transistors that are sold here are transistors with 2n****

thanks for the help  :)

[audioguru]

Hi Jpop,
Just about any little NPN transistors will work in that circuit. Its supply is only 3V and  the LED driver's current is only about 25mA.
I would use 2N3904 transistors. ;D

[Guest SM2GXN]

Think 2N3704 would do the job and as audioguru said Just about any little NPN transistors will work.
I don't know which is the most used UNI transistor in US so my choise is just a guess of what would be a handy replacement for the BC337 ;D

[audioguru]

Yes, even a 2N3704 transistor will work. Digikey sells them for $.30US each.
They sell the 2N3904 for $.16US each because they are more popular.
They sell the BC337 for $.33US each. ;D

[ante]

Hi audioguru,

What happened to the old”workhorse” 2N2222, is it still around over there?

[audioguru]

Hi Ante,
The 2N2222A in a plastic case is $.36US each at Digikey.
In my entire career I don't think I have ever seen one. ;D

[Guest Alun]

I thought the 2N2222A ina plastic case is the PN2222A, by the way how come there seem to be still loads of metal cased transistors on the market when I haven't seen a single one in a piece of modern consumer electronic equipment?

[audioguru]

Hi Alun,
You can still buy metal-cased 2N2222A transistors at Digikey for $.86US each, but there is only one supplier (ST Micro).
ON Semi make the best of both worlds, a P2N2222A in a plastic case!