The Natural Philosopher wrote:
On 15/01/18 12:15, Bob Minchin wrote:
Having used 3055 type bipolar transistors for years with all manner of
prefixes and suffixes in either TO3 or TO220 packages, I opened up
something to repair today to find a MTP3055E inside and behaving
strangely.

Turns out it is an N channel Mosfet! GRRR!

http://www.sycelectronica.com.ar/sem...s/MTP3055E.pdf

Of all the numbers they could have given it why choose 3055 that so
widely known for being a bipolar power transistor.

Possibly becasue it has similar power ratings and so on.

But it was a *2N*3055 that was the bipolar.

Not the AC3055, or the OC3055 or the BFY3055.... :-)



Moral: Don't assume anything!


But there was a TIP3055 which a bipolar power transistor