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Old 24th June 2007, 02:17 AM   #1
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Default TO-126 transistor equivalent

I need something in a TO-126-type package to replace a rather tough to find transistor (a 2SC1628). Needs to be rated for about 150V, 50-100mA, 1W, and 70MHz ft. Easy to find this with a BCE layout, but the tough part is that I need a CBE layout (or EBC).

Any ideas? Perhaps a 'BC-type' numbered part?
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Old 24th June 2007, 08:50 AM   #2
lineup is offline lineup  Sweden
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Default MJE340 OnSemi Motorola

.
hi

MJE340 ( OnSemi Motorola )
is often used instead of BD139, and such TO126,
when it comes to higher voltage than 80

From beginning MJE340 - MJE350 were intended for Video, TV applications
which can have rather high voltage and Fast Signals.
But as you know, it has been used ever so many times
in Hifi Power Amplifiers.
Both in professional commercial amps and in DIY.
----------------------

on the + : MJE340 can be found everywhere, to low price, pretty good for audio!
on the - : not much, but there are better, harder-to-find and more expensive transistors, today

For use 80 Volt and lower,
BD139 / BD140 will be clearly Better choice than MJE340 / MJE350
and should be used.


Regards lineup
-----------------------
OnSemi datasheet and MJE340 Curves
http://www.onsemi.com/pub/Collateral/MJE340-D.PDF
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Old 24th June 2007, 09:36 AM   #3
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Default Re: TO-126 transistor equivalent

Quote:
Originally posted by EchoWars
I need something in a TO-126-type package to replace a rather tough to find transistor (a 2SC1628). Needs to be rated for about 150V, 50-100mA, 1W, and 70MHz ft. Easy to find this with a BCE layout......
1W in a T0126 package seems like overkill.
Do you need 1W of dissipation?
Do you need To126?

As far as I know all To126 are BCE and are the reverse of the ECB found in To220, To247 & To264.

BC To92 are usually EBC, but the L version is usually BCE like the To126.

To92 2N and Eline are usually CBE.
Zetex do a range of Eline that have 1W and 1.5W dissipation that can meet your spec. They are usually quite a bit more expensive than BC and other cheap To92. ZTX455 gets close, but only 140Vce0.

edit,
No, but he expects everyone else to read.
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Old 24th June 2007, 09:37 AM   #4
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Did you not read his post? He needs CBE or EBC pinout.

I think it's going to be tough finding something with that pinout. Maybe you can use a BCE device and bend a leg to fit?
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Old 24th June 2007, 11:41 AM   #5
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Default Re: TO-126 transistor equivalent

Quote:
Originally posted by EchoWars
the tough part
Crazy old X17 package.
Think old numbers for this pinning ; Motorola 2N5058, BF758.
A BF758 costs a dollar the piece overhere.
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Old 24th June 2007, 03:24 PM   #6
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I wasn't referring to you Andrew We were writing our replies at the same time.

I'm pretty sure you know what I meant, I'm just being extra sure
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Old 24th June 2007, 04:07 PM   #7
AndrewT is offline AndrewT  Scotland
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Hi Richie,
I know that we read and that you do not need to excuse yourself.
It's Lineup that has his own agenda.
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Old 24th June 2007, 11:20 PM   #8
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MJE340 and BD139 are all ECB layout, unfortunately. And yes, I need the 1W rating. There's not a lot of current through them, but C-E voltage is rather high, and they're at close to 1/2W dissipation as it is...I want the 1W rating for a comfort zone.

BF758 is a good package (forgot about the old TO-202 package), but I cannot find a datasheet (or someone who sells them), and I need to see it. And I don't think I can bend the circular arrangement of the leads on the 2N5058 around to do the job.

Maybe a little Zetex with a 'flag' style heatsink...? I'd rather find a bit heavier-duty package.
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Old 24th June 2007, 11:35 PM   #9
lineup is offline lineup  Sweden
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Quote:
Originally posted by EchoWars

MJE340 and BD139 are all ECB layout, unfortunately.
.
There are several ways around,
for different pinning attachment.

1. Carefully use a tool to bend legs, pins
into 'PCB wanted pinning' and so be able to fit into TO126 holes.

This is best done, while keeping MJE340 the legs LONG
and then afterwards, if possible/needed, cut them off.
Cut later from backside of PCB! .... goes for most all components!

2. Use short pieces of copper wires (short as possible ) as an adopter
for your transistors, to different PCB Pinnings.


Method 1. is to prefer.
As we strive to keep wires short, in audio amplifiers.
This is nothing new.
This most of us has had to do ... from time to time.



Regards lineup
----------------------------------------------------------
A supply of MJE340 MJE350 is what a DIY builder could keep in 'his standard box'.
With the general purpose data of MJE340 MJE350
there is not much you can not do .. when need a Medium power BJT, such as TO126.
... 300 Volt and several watts at reasonably good gain and quality
... at low price & high availability, easy to find
... makes very good and useful Complementary Transistor devices
can we ask for more

Another very useful standard for you 'box':
2N5551 / 2N5401 ... 150 Volt small signals, very good audio transistors
... and these are not shy for a bit higher currents than BC550C / BC560C ( 45 Volt )
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Old 25th June 2007, 12:26 AM   #10
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There is no room to use a BCE component and bend the leads...board is too populated. Option #2 is too much of a hack...I'd save that as the ultimate last resort if all other options were exhausted, and even then I don't know if it could be done due to the limited space.
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