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Old 12th September 2012, 03:42 PM   #1
tinitus is offline tinitus  Europe
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Default TO-92 color

any special reason for this color?
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Old 12th September 2012, 03:55 PM   #2
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I saw some silver plated in this zone. Philips make sometimes those things. And perhaps somebody used a pen to colored it.
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Old 12th September 2012, 04:51 PM   #3
djQUAN is offline djQUAN  Philippines
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There are also red ones.
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Old 12th September 2012, 05:05 PM   #4
tinitus is offline tinitus  Europe
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but not 30 years old

no data found, only indications saying close relative to 556
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Old 12th September 2012, 05:12 PM   #5
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Think I've seen green ones in old TV's (Thorn... and very old ) I've got some blue BFxxx's somewhere.
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Old 12th September 2012, 07:08 PM   #6
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There is no telling what the marketing department will come up with. GE Semi used to use red for NPN transistors and Green for PNP. Of course, color blind people can't tell those two colors aparts. !
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Old 12th September 2012, 07:26 PM   #7
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Hi,

Yes,
Green - PNP
Black/Grey - NPN

Japan made transistors used to be colored like that (way back).
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Old 12th September 2012, 08:51 PM   #8
tinitus is offline tinitus  Europe
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ok, thanks

BC253B, is it any good ?

I also have 'M' SPS 5418, with gold plated legs
cant identify them either
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