Suggestions For Inspection

[MANATEC]

Hii,

I am new to this site.., i would like to have your suggesstions on the parameters to be inspected during incoming inspection in a transistor when it is bought for a mass production company

Thanks in advance

 

[Papabravo]

I don't think there is much you can do. Surface mount components come tape and reel. I'm pretty sure you're not proposing that you remove the parts, test them, and repackage them since that would double or triple the cost. Even if they are TO-92 in a bulk package it simply isn't worth the time or trouble to test them.

 

[MANATEC]

i jus want to do sample testing

 

[Papabravo]

OK sample testing. You have a reel of 3000 2N3904MMBT transistors in a SOT-23 package. Are you seriously considering taking a part from the middle of the reel for testing? What is the poor pick and place machine supposed to do when it tries to place the part from an empty position on the tape. This is so 1970's

 

[MANATEC]

I dont want to test smt components. I want to check discrete components

 

[Papabravo]

The point I am trying to make is that we don't spend any time or effort testing penny components. The manufacturing yields are good enough that we dont have to. Another reason to skip testing is that we design circuits that are not sensitive to even substantial variations in parameters. It just is not necessary to perform incoming inspection on discrete transistors. That you are even thinking about it shows that you need to reorder your priorities.

I guess the test is we put it in a board and see if the board works.