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Old 19th May 2010, 09:47 AM   #1
bobcat is offline bobcat  United Kingdom
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Default Transistor substitutes

Hi all i have managed to locate a schematic for my stageline sta 750 from this forum & thanks,
but iam unable to locate some of the transistors from my usual suppliers
so was hoping that some kind person out there
could help with some substitutes
they are
2sd667
2sb647
2sc1815
2sa1837
2sc4793
2sd669a
all assistance is greatly appreciated
also can someone suggest a good semiconductor equivalent book available in the uk.
regards Bobcat
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Old 19th May 2010, 11:26 AM   #2
Mooly is online now Mooly  United Kingdom
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Well this is good for most data sheets,
Datasheet catalog for integrated circuits, diodes, triacs, and other semiconductors, view

As to books... T.D. Towers was the one to have.
Amazon.co.uk: towers transistor selector
don't know the last edition though and the web has kind of made all these obsolete.

2sd667/2sb647 are complementary pair... can't think of anything common in that package as equivalents, you will have to search the catalogues. MJE340/350 are a common choice TO126 package but only 0.5 amp rating... is it enough for your application ?

2SC1815 is general purpose... they are in everything and should be easily available, BC546 is fine, as is 2N5551 etc, but the pinouts are different. Anything will work for these as long as it's rated similarly.

2SA1837/2SC4793 are another complementary pair... high voltage TO220 package. Can't think of anything similar off hand.

2SD669... again is 0.5 amp enough... MJE 340 again.

I'll have a think
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Old 19th May 2010, 02:24 PM   #3
AndrewT is offline AndrewT  Scotland
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2sd669ac is a 1.5A device with hFE>100 @ Ic=150mA and 20W <=40Vce

You will struggle to source an equivalent. Which parameters are absolutely necessary and which can be relaxed?
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