Hi guys,

I was wondering if someone might know if there is a good substitute to the BF487 transistor out there. Ive looked everywhere and found a site that said that BF487can be replaced by BF485, but the BF485 is just as "rare"...

Any help would be appriciated

 

Hello,

What voltage do you use?
The BF487 is rated for a VCE of 400 Volts.
See the datasheet for more info.

Greetings,
Bertus

 

I'm using it for an 230V application. A substitute is pretty hard to find, isnt it?

 

Hello,

At what frequency should your application work?
There are some with higher power rating, but lower frequencies.

Greetings,
Bertus

 

Hi Bertus, thanks for helping out (as usual). I think around 10-50 kHz. It's supposed to be a feedback system for a boost converter.

There are some with higher power rating, but lower frequencies.

Which transistors do you have in mind?

Would a MPSA44 be a good equivalent/replacement?

 

Hello,

I think that will do.
I have attached a table with transistors (unzip and read it in microsoft excel or open/libre office calc).

Greetings,
Bertus

 

Thank you Bertus, very nice of you to share that list with us!