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transistor equivalent

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zavedur rahman

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hi friends
i have a problem, whenever i try to get a transistor in market i find them very obsolete one . how can i know whether a particular transistor is new one or old one by its part number.
can i get equivalent transistor source??
i need BF494 for my project. i cant find it ,pls somebody tell me some alternative transistor which r available in market(not obsolete).

zaved
 
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