Now I bought few components for further use like this:- 2n3904, 2n2222, BC547, 2n2219, 2n3553, 2sc1971, 555 Timer, 7805 Reg, LDR, different types of capacitors. I bought more than my need. Will they expire like food product after certain time even without using? Want to know actual fact.
Nah, they are made of silicon. Store them somewhere dry (use silica gel packets) and cool in an anti-static bag if you have one. They will be fine for a LOOOOONG time.
Static sensitive devices like CMOS ics and mosfets can be damaged just by touching the pins. Special precautions are required when handling these devices.
Comparatively here I can find electronics part in very low cost than USA. So I guessed most of parts are fake. But there are no alternative so I bought. I can buy Four 2N2219 in $ 1 here . 2SC1971 can found on $ 1 only. The labele is "TL 2N3866", "GL2N2219" and "C1971" with logo of Mitshubisi. I hope even fake will work . I have no idea to check it is Fake or Real. Do you have?
Hope this simple components is not very sensitive on static charge.
I buy name brand American and European parts from Digikey or Newark. They are not fakes.
I have used tens of thousands of transistors and ICs in my career and NONE has ever failed.