5th element said:
I got the impression they were obsolete when chasing for
them a while back, one reason being that they were discontinued
at some suppliers. However, Hitachi listed the status for these
devices as "mass production" in December and I found another
supplier to buy them from. Actually, when I check the devices
I bought I find that only one of these types are Hitachi, so
there seems to be several companies still manufacturing them.
BTW, the Hitachi datasheets have a very recent date (year
2000, I think) and no note about this being a revision, so
perhaps someone else used to manufacture these transistors
but quit production and Hitachi took over?
Hi Christer
It's a strange world
I found the manufacturers in my data books, but were talking
'86-'87 here so I might be out of date. Although I have some recent data who
lists Toshiba for the 649’s.
I found the 649's also at: http://www.semicon.panasonic.co.jp/md/e-29269D.html
Found that CDIL. Our Indian friends are producing a lot of semicons these days:
http://www.cdil.com/
Digging is fun when we get some reply. So lets wait...
It's a strange world
I found the manufacturers in my data books, but were talking
'86-'87 here so I might be out of date. Although I have some recent data who
lists Toshiba for the 649’s.
I found the 649's also at: http://www.semicon.panasonic.co.jp/md/e-29269D.html
Found that CDIL. Our Indian friends are producing a lot of semicons these days:
http://www.cdil.com/
Digging is fun when we get some reply. So lets wait...
Confusion about parts numbers?
Now the confusion level is rising steadily.
I assumed Matt was asking about 2SB649 and 2SD669 which
are complementary and often used together. Neither or these
appear in the Panasonic list, but on the other hand both 2SB669
and 2SD649 do. I knew these parts existed too, but I
know nothing about them, and I don't think they are
complementary. However, I now see that Matt actually asked
about 2SD649 and 2SD669, so the confusion is total. Is that
what he meant to ask, or did he mean 2SB649 and 2SD669, or
....?
Matt, I think you'd better tell us if you meant what you wrote,
or otherwise which transistors you asked about.
Thanks. I was to lazy to check it up myself right now. Actually,
I ordered a bunch of 2SB649 and 2SD669 in December, but I
haven't had time to use them yet. Hence, I hadn't really paid
attention to the brand before. Now when Matt asked, I thought
I should check that the ones I got actually were Hitachi, but
found that the 2SB649's were actually CDIL. Strangely, CDIL
does not appear to manufacture these devices according to
the online product list, but this list seems to be old, so I suppose
they have taken up production recently. To be more precice,
the transistors I have are labelled as P3B649A, which doesn't
look like a CDIL part number at all, but they do have CDIL
printed on them. I am almost getting a little bit worried now,
but why would anyone make pirate copies of such cheap
devices?
Netlist said:
Now the confusion level is rising steadily.
I assumed Matt was asking about 2SB649 and 2SD669 which
are complementary and often used together. Neither or these
appear in the Panasonic list, but on the other hand both 2SB669
and 2SD649 do. I knew these parts existed too, but I
know nothing about them, and I don't think they are
complementary. However, I now see that Matt actually asked
about 2SD649 and 2SD669, so the confusion is total. Is that
what he meant to ask, or did he mean 2SB649 and 2SD669, or
....?
Matt, I think you'd better tell us if you meant what you wrote,
or otherwise which transistors you asked about.
Found that CDIL. Our Indian friends are producing a lot of semicons these days:
http://www.cdil.com/
Digging is fun when we get some reply. So lets wait...
Thanks. I was to lazy to check it up myself right now. Actually,
I ordered a bunch of 2SB649 and 2SD669 in December, but I
haven't had time to use them yet. Hence, I hadn't really paid
attention to the brand before. Now when Matt asked, I thought
I should check that the ones I got actually were Hitachi, but
found that the 2SB649's were actually CDIL. Strangely, CDIL
does not appear to manufacture these devices according to
the online product list, but this list seems to be old, so I suppose
they have taken up production recently. To be more precice,
the transistors I have are labelled as P3B649A, which doesn't
look like a CDIL part number at all, but they do have CDIL
printed on them. I am almost getting a little bit worried now,
but why would anyone make pirate copies of such cheap
devices?
Thanks jackinnij. Though I didn't suspect those of my transistors
that are labelled hitachi, I doesn't hurt to compare, and they
look close enough to yours. The ones that are branded CDIL
are slightly more worrying, but at least CDIL itself seems to
be an OK company. It seems they've been around since 1964.
that are labelled hitachi, I doesn't hurt to compare, and they
look close enough to yours. The ones that are branded CDIL
are slightly more worrying, but at least CDIL itself seems to
be an OK company. It seems they've been around since 1964.
I used sometime ago TIP33/34CF from CDIL and they worked fine. Sometimes I made short circuit tests to verify the thermal sensors and the SOA protection of the circuit and these transistors passed very well on the test.
It was just one time, but, based on it, I think you don't have to be affraid of using CDIL devices.
Regards
It was just one time, but, based on it, I think you don't have to be affraid of using CDIL devices.
Regards
blmn said:
No, I am sorry if I was unclear. Although I had never heard of
CDIL before, they seem to be respectable and these transistors
are probably quite old now and should be easy to produce.
What bothered me was that they are not listed among CDIL
products on the CDIL website and that the part numbers
did not look similar to other CDIL part numbers. However,
the product list seemed not updated for a couple of years,
so i guess they have started manufacturing these devices since
the list was updated.
BTW, Christer
Are you in Sweden now?
'cause here in Brazil is 22:00h summer time. I suppose you really enjoy the night !!
And, I don't know if it's necessary a new thread, but someone knows the Rth(j-c) for these to3p isolated devices? CDIL catalog don't have very much info about the devices and I didn't find datasheets for them.
Regards
Are you in Sweden now?
'cause here in Brazil is 22:00h summer time. I suppose you really enjoy the night !!
And, I don't know if it's necessary a new thread, but someone knows the Rth(j-c) for these to3p isolated devices? CDIL catalog don't have very much info about the devices and I didn't find datasheets for them.
Regards
Netlist said:Hi all
It was me who mixed things up. I accidentally searched for the 2SB instead of the 2SD
Sorry for that
/Hugo - Is wrong now and then
Well, i suspect the original question was mistaken too, since
it asked about two SD devices. While this may have been the
intention, I would rather think Matt meant to ask about
2SB649 and 2SD669, since these are complementary and
often used in amplifiers.
blmn said:
Well, it was just after 1 o'clock at night here. But I guess you
are right that I like the night. I have a tendency to stay up late
just because it quiet and easier to think at night.
Now, since there has been some confusion, do you mean
2SB649 and 2SD669?
In that case, did you actually find any info from CDIL about
these at all?? I couldn't find them in their product lists.
Anyway, the cases are not TO3P, but TO126 (Hitachi actually
says TO126 MOD in the datasheets). Hitachi has derating
diagrams, so it is possible to calculate the thermal resistance.
They can disspate 20W up to 25 deg C case temp and are
derated lineraly up to 150 deg, so that gives approx. 6 K/W
(or 6 deg C/W if you prefer that
). I have no idea if onecan trust this to hold also for the CDIL versions.
Sorry, my fault.
Actually I was talking about the TO3P Isolated CDIL devices that I used in my project (TIP33/34CF).
CDIL has no datasheets for their devices. I estimated something like 1 or 1.5C/w.
Coming back to the obsolete replacements, I have some 2SB546/2SD401 and they seem to be good drivers, but I didn´t find datasheets for them too (pecor and nec).
Regards
Actually I was talking about the TO3P Isolated CDIL devices that I used in my project (TIP33/34CF).
CDIL has no datasheets for their devices. I estimated something like 1 or 1.5C/w.
Coming back to the obsolete replacements, I have some 2SB546/2SD401 and they seem to be good drivers, but I didn´t find datasheets for them too (pecor and nec).
Regards
I built the CF OPS (Complementary Feedback Output Stage) Amplifier (figure 11-4, p337) from Randy Slone’s "High-Power Audio Amplifier Construction Manual". I couldn't find 2SB649 and 2SD669 and used the NTE373 and NTE374 instead. They are listed by NTE as substitutes. I am having some problems with this amp. See:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=13469
http://www.diyaudio.com/forums/showthread.php?s=&threadid=13469
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