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.

Moral: Don't assume anything!

On 15/01/2018 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.

Moral: Don't assume anything!

That's not smart, I would have assumed the same.

On Monday, 15 January 2018 12:46:24 UTC, Fredxx wrote:
On 15/01/2018 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.

Moral: Don't assume anything!

That's not smart, I would have assumed the same.

I guess it's difficult if you just refer to 4 digits to describe such a thing.
I have mine labled as 2N3055 .
3055 is also the code for an alpha wire.
I wouldn't allow my studetns to just type 3055, I'd expect them to be able to type the name in and order code and supplier, that's what teaching is about. ;-)

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!


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don't protect, masquerading as public servants who don't serve the public.

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

On 15/01/2018 18:24, Bob Minchin wrote:
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

There is still a MJE3055.

On Monday, 15 January 2018 12:12:35 UTC, 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.

Moral: Don't assume anything!

There's also the fact that not even all 2N3055s are the same type of device. Older and later ones are different process and differ significantly.


NT

On 15/01/18 13:14, wrote:
Older and later ones are different process and differ significantly.
Oh dear.

a transistor spec is a minimum spec.

Not a maximum, not a typical.

so its perfecly possible that significantly better transistors can share
the same part number.

e.g. back in te day most BC107 would handlee 70V. but the spec only said
45v IIRC




--
"When one man dies it's a tragedy. When thousands die it's statistics."

Josef Stalin

On Monday, 15 January 2018 22:33:26 UTC, The Natural Philosopher wrote:
On 15/01/18 13:14, wrote:
Older and later ones are different process and differ significantly.
Oh dear.

a transistor spec is a minimum spec.

No most specs of transostors of typical lower and upper levels for the same numbered device. Some may have prefixes denoting changes to specs.




Not a maximum, not a typical.

so its perfecly possible that significantly better transistors can share
the same part number.

e.g. back in te day most BC107 would handlee 70V. but the spec only said
45v IIRC

I've had BC107A BC107B BC107C and now we have differnt sizes of surface mount devices also with slightly differing specs.

In article 97d70232-71a0-41bc-965e-
, says...


I've had BC107A BC107B BC107C and now we have differnt sizes of surface mount devices also with slightly differing specs.


In the case of the BC107 range, the A, B and C versions were
graded according to their DC current gain into three bands.

A BC107 without a suffix could have gain figure anywhere in
the range of 110 to 450.

The BC108 had an even greater gain spread - from 110 - 800

--

Terry

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In article ,
Terry Casey wrote:
In article 97d70232-71a0-41bc-965e-
, says...


I've had BC107A BC107B BC107C and now we have differnt sizes of surface mount devices also with slightly differing specs.


In the case of the BC107 range, the A, B and C versions were
graded according to their DC current gain into three bands.

A BC107 without a suffix could have gain figure anywhere in
the range of 110 to 450.

The BC108 had an even greater gain spread - from 110 - 800

Were they one of those devices where they were all made the same, measured
afterwards and then labelled?

--
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Dave Plowman London SW
To e-mail, change noise into sound.

On Tuesday, 16 January 2018 11:10:46 UTC, Terry Casey wrote:
In article 97d70232-71a0-41bc-965e-
, says...


I've had BC107A BC107B BC107C and now we have differnt sizes of surface mount devices also with slightly differing specs.


In the case of the BC107 range, the A, B and C versions were
graded according to their DC current gain into three bands.

A BC107 without a suffix could have gain figure anywhere in
the range of 110 to 450.

The BC108 had an even greater gain spread - from 110 - 800

and there't the BC109a,b,c

Other confisions are when the BC182L and BC182K are the sma e spec but differnt pinout.


We tend to use the 2N2222A more now and I'm trying to replace them with the cheaper versions PN2222 as for what the students use them for they should be OK.

On Monday, 15 January 2018 22:33:26 UTC, The Natural Philosopher wrote:
On 15/01/18 13:14, tabbypurr wrote:
Older and later ones are different process and differ significantly.
Oh dear.

a transistor spec is a minimum spec.

Not a maximum, not a typical.

Must be a while since you read any transistor data sheets


so its perfecly possible that significantly better transistors can share
the same part number.

e.g. back in te day most BC107 would handlee 70V. but the spec only said
45v IIRC

they can, but that isn't the issue. Here's what wiki says:

"With changes to semiconductor manufacturing technology, the original process became economically uncompetitive in the mid-1970s, and a similar device was created using epitaxial base technology.[1] The maximum voltage and current ratings of this device are the same as the original, but it is not as immune from secondary breakdown; the power handling (safe operating area) is limited at high voltage to a lower current than the original."


NT

Yes the old 2N3055 could easily be persuaded to run at medium wave and put
out quite a bit of rf. Not that I'd ever have done such a thing of course.


Brian

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"Bob Minchin" wrote in message
news
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.

Moral: Don't assume anything!