Does ne body knw what do the initials in the names: BC557,and IN4148 mean?? I mean what do 'B' and 'C' in BC557 and 'I' & 'N' in IN4148 mean?? I wanted it for my external viva.
need help urjently
Dec 07, 2008
10 Replies
BC is the old european code for 'Broadcast Quality'. There is no IN code so that was probably originally an Intel house number. Good luck with your Viva :-)
not sure about the BC, I think it's got something to do with nothing of transistors how ever, the IN... is actually 1Nxxxx
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The OP is about to be verbally examined on a subject that he belives a superficial knowledge of transistor and diode marking codes will help him pass. Two possibilities exist: 1. He is deluded, or 2. the examiner is deluded. In either case assisting a student who cannot Google for 'transistor diode codes' and read the first result is a disservice to the profession. If one is seeking accurate answers to homework and exam cramming questions one should display at least a little prior effort.
Good thing it's verbal... he sure can't spell.
But it matters little what BC and 1N are. They're just part numbers, and few if us will ever access the original JEDEC or equivalent documents.
John
^^ ( comment made > "he sure can't spell." Maybe one should proof read their own before criticizing others )
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'urjently' ... don't you have a spell checker?
Isn't it something like: for the European designations, first letter A = Germanium, B = Silicon, C = something else (e.g. GaAs, as in Gunn diodes), second letter A = 2-lead device such as a diode, B = RF 2-lead device, C = LF low-power transistor, D = LF power transistor, F = RF low-power transistor, G = switching transistor, L = RF power transistor, X or Y = power diode, and so on, sometimes with a third letter for specialist devices; and for the US designations, initial number 1 = 2-lead device, 2 =
3-lead device, 3 = 4-lead device (e.g. dual-gate FET) - the letter N signifies the US numbering scheme and separates the initial number from the remaining digits that form the device identifier, which represents all the other information (e.g. Ge, Si, etc., NPN/PNP BJT, N or P-channel FET, etc. from a look-up table)?Then there's the Japanese scheme, Ferranti's old ZTXabc scheme, the Newmarket NKTabc scheme, etc., etc.
Chris
This, from the biggest offender on USENET? Anyway, 'IF' is spelled correctly. Its just the wrong word. That makes it an error in context, not spelling.
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I can spell... I just can't type.
John
Well firstly it's NOT IN4148, it's 1N4148 !
And yes I do know but why should I tell someone who can't even be bothered to research it for himself. Hint: JEDEC and Pro-Electron.
Graham
hey u r being so mean man.k fine ne ways im done wid my viva. idont know y people bother to even reply when they are not interested for help.!!
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