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BJT BF200 with 4 terminals

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MahmoudHassan

MahmoudHassan

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Hello
Dear All

I bought a BJT BF200 as a high frequency transistor but I found it has 4 terminals not only 3 like that used in conventional transistors. the fourth terminal for the case and I am using it in FM receiver so where should I connect this fourth terminal? do I leave it unconnected or connect it to collector ?

Datasheet http://pdf.datasheetcatalog.com/datasheet_pdf/continental-device-india-limited/BF200.pdf

Best Regards,
Mahmoud
 

I would expect that the purpose of the 4th terminal is explained ín the datasheet. Some old style metal can packages have a shield terminal which should be connected to circuit ground.
 
Yes but I knew it is for the metal packages but I found that in other BJT transistors collector was connected to directly the package by manufacturer without a fourth terminal especially power transistors.
 

In the early to mid 70s, I worked with some germanium RF transistors made by Philips.
The 4th lead was the case and was connected to ground.

Unfortunately, it was too long ago and I can't remember the P/N.
 
The BF200 is a very old silicon RF transistor and has not been made for many years. The datasheet shows its 4 pins and one is its metal case. I would think that there will be some capacitance from the chip to the metal case.
 
Many Thanks guys
Wishing the best for all of you :)
 

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