Q. About IDing some Transistors

  • Thread starter Watson A.Name - "Watt Sun
  • Start date
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Watson A.Name - "Watt Sun

Guest
I pulled some chokes out of an old defunct VCR board, and along with
those I pulled a dozen or so transistors. Some of those were C1740s
which are 2SC1740s, which come in a case that's smaller and more
squarish than the TO-92. But several of these transistors were in the
same package but marked with odd numbers. Like the following:

C114_
E S G

A114_
E S F

A124_
E S D

A144_
E S G

The underscore is really a line over the last letter of the bottom
line. The E seems to correspond with the emitter designation on the
board silkscreen. All of them are marked with a Q, such as Q901,
etc., on the board, so I don't think they are dual diodes in a
transistor package.

If those were 2SC and 2SA numbers, they would be so low that they
would probably be the old germanium transistors. Therefore I don't
think that any of these are 2SA114, etc. Does anyone know what the
transistors are? I have pictures! </Dr. Phlox> if needed. Thanks.



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"Watson A.Name - Watt Sun, Dark Remover" wrote:
I pulled some chokes out of an old defunct VCR board, and along with
those I pulled a dozen or so transistors. Some of those were C1740s
which are 2SC1740s, which come in a case that's smaller and more
squarish than the TO-92. But several of these transistors were in the
same package but marked with odd numbers. Like the following:

C114_ Obsolete, but it crosses to NTE128 NPN SI AF preamp
E S G
Click to expand...

These three are still readily available.


A114_ MCM $1.99
E S F

A124__ MCM $3.08
E S D

A144__ MCM $1.86
E S G
Click to expand...
http://www.mcminone.com

The underscore is really a line over the last letter of the bottom
line. The E seems to correspond with the emitter designation on the
board silkscreen. All of them are marked with a Q, such as Q901,
etc., on the board, so I don't think they are dual diodes in a
transistor package.

If those were 2SC and 2SA numbers, they would be so low that they
would probably be the old germanium transistors. Therefore I don't
think that any of these are 2SA114, etc. Does anyone know what the
transistors are? I have pictures! </Dr. Phlox> if needed. Thanks.
Click to expand...

Not all the lower 2S* *** numbers were germanium.

--
3 days!


Michael A. Terrell
Central Florida
 
In article <3FE7BDE3.B699C034@earthlink.net>,
mike.terrell@earthlink.net mentioned...
"Watson A.Name - Watt Sun, Dark Remover" wrote:

I pulled some chokes out of an old defunct VCR board, and along with
those I pulled a dozen or so transistors. Some of those were C1740s
which are 2SC1740s, which come in a case that's smaller and more
squarish than the TO-92. But several of these transistors were in the
same package but marked with odd numbers. Like the following:

C114_ Obsolete, but it crosses to NTE128 NPN SI AF preamp
E S G



These three are still readily available.


A114_ MCM $1.99
E S F

A124__ MCM $3.08
E S D

A144__ MCM $1.86
E S G

http://www.mcminone.com

The underscore is really a line over the last letter of the bottom
line. The E seems to correspond with the emitter designation on the
board silkscreen. All of them are marked with a Q, such as Q901,
etc., on the board, so I don't think they are dual diodes in a
transistor package.

If those were 2SC and 2SA numbers, they would be so low that they
would probably be the old germanium transistors. Therefore I don't
think that any of these are 2SA114, etc. Does anyone know what the
transistors are? I have pictures! </Dr. Phlox> if needed. Thanks.


Not all the lower 2S* *** numbers were germanium.
Click to expand...
Hi, Mike; thanks for the info.

I went to this URL and found a cross ref for 2SA numbers to a Euro or
Pro-Electron number. The Pro-Electron numbers begin with A if they're
Germanium, or B if they're silly-con. Well, the URL shows that most
of the numbers below 2SA400 are crossref'd to an AF239S, which is a
Germanium transistor.
http://perso.wanadoo.fr/pouzou/site/composants/sa/2s0.htm

I went to the MCM website and I didn't see any info on those, but I
didn't try to sign up for anything or such. If they have these, they
may still be germanium transistors. I'd like to know if they crossref
them to a germanium or silicon transistor.

I checked the NTE catalog and the 2SA114 and 2SA124 crossref to the
NTE 126, which is a germanium transistor.

I still have some old Japanese transistor radios with those low
numbered 2SA types, and they were all in metal cans, all were
germanium. Judging from the date codes on the other chips on this VCR
board, these transistors date from the late '80s, probably 89.

These transistors are smaller than the TO-92 package, so perhaps the
maker went to a manufacturer's code like the surface mount parts use.
I can't come up with any other explanation. Thanks again.

--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
 
In article <3FE7BDE3.B699C034@earthlink.net>,
mike.terrell@earthlink.net mentioned...
[snip]

Not all the lower 2S* *** numbers were germanium.
Click to expand...
Here's another website that says those low 2SA numbers are germanium.
http://homepage3.nifty.com/ebina2540/data/2SA/2SA0101-0200.htm



--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
 
Watson A.Name - "Watt Sun, Dark Remover" <alondra101@hotmail.com>
wrote:

I pulled some chokes out of an old defunct VCR board, and along with
those I pulled a dozen or so transistors. Some of those were C1740s
which are 2SC1740s, which come in a case that's smaller and more
squarish than the TO-92. But several of these transistors were in the
same package but marked with odd numbers. Like the following:

C114_
E S G

A114_
E S F

A124_
E S D

A144_
E S G

The underscore is really a line over the last letter of the bottom
line. The E seems to correspond with the emitter designation on the
board silkscreen. All of them are marked with a Q, such as Q901,
etc., on the board, so I don't think they are dual diodes in a
transistor package.

If those were 2SC and 2SA numbers, they would be so low that they
would probably be the old germanium transistors. Therefore I don't
think that any of these are 2SA114, etc. Does anyone know what the
transistors are? I have pictures! </Dr. Phlox> if needed. Thanks.
Click to expand...
They may be DTC114, DTA114, DTA124 and DTA144, which I think are small
signal switching transistors with built in resistors.

--
Terry Pinnell
Hobbyist, West Sussex, UK
 
In article <r57guv0k1chbp84113nb9ct21pug4imier@4ax.com>,
terrypinDELETE@dial.pipexTHIS.com mentioned...
Watson A.Name - "Watt Sun, Dark Remover" <alondra101@hotmail.com
wrote:

I pulled some chokes out of an old defunct VCR board, and along with
those I pulled a dozen or so transistors. Some of those were C1740s
which are 2SC1740s, which come in a case that's smaller and more
squarish than the TO-92. But several of these transistors were in the
same package but marked with odd numbers. Like the following:

C114_
E S G

A114_
E S F

A124_
E S D

A144_
E S G

The underscore is really a line over the last letter of the bottom
line. The E seems to correspond with the emitter designation on the
board silkscreen. All of them are marked with a Q, such as Q901,
etc., on the board, so I don't think they are dual diodes in a
transistor package.

If those were 2SC and 2SA numbers, they would be so low that they
would probably be the old germanium transistors. Therefore I don't
think that any of these are 2SA114, etc. Does anyone know what the
transistors are? I have pictures! </Dr. Phlox> if needed. Thanks.

They may be DTC114, DTA114, DTA124 and DTA144, which I think are small
signal switching transistors with built in resistors.
Click to expand...
Oof! Built-in resistors? That means I should be able to read the
resistance with the DMM. Hmmm.. Lessee... Assuming the center lead
is the collector, and outer two leads are E and B, I measure the outer
two leads and.. Hey! they measure 18.6k, and it's the same either
way, so it's a resistor! I would've never thought to check that.

Thank you, thank you, Terry. I would have probably tried to use these
as a regular transistor and wondered why everything was messed up!

I did a search on Google and came up with this:

<<
Elso Kwak
quote:
Originally posted by dhaen
Hi Netlist,

Are you sure these are really the type numbers? Are they the only
numbers printed?

How did you determine they were faulty?
The reason I ask is that Sony have used some odd devices sometimes
called "digital transistors". They have 2 resistors inside, 1 in
series with the base connection, and one between the base and emitter.
They are used for logic inversion.
If you try to measure these, they appear to be faulty.

Just an idea..:scratch:

Cheers,

Hi dhaen,
I am inclined to agree with you. My Sony CDP has some small
transistors
f.a. DTA114 is a PNP with 10k resitors between base and collector and
at the base. The marking on the body is A114
DTC114ES is a NPN
anything like this perhaps:?
Elso Kwak
quote:
Originally posted by dhaen
Hi Netlist,

Are you sure these are really the type numbers? Are they the only
numbers printed?

How did you determine they were faulty?
The reason I ask is that Sony have used some odd devices sometimes
called "digital transistors". They have 2 resistors inside, 1 in
series with the base connection, and one between the base and emitter.
They are used for logic inversion.
If you try to measure these, they appear to be faulty.

Just an idea..:scratch:

Cheers,

Hi dhaen,
I am inclined to agree with you. My Sony CDP has some small
transistors
f.a. DTA114 is a PNP with 10k resitors between base and collector and
at the base. The marking on the body is A114
DTC114ES is a NPN
anything like this perhaps:?
http://www.rohm.com/products/databo...df/dta114ee.pdf
or
http://www.onsemi.com/pub/Collateral/DTA114E-D.PDF

:confused: :confused:
Hi John, Elso, Halo
Looks we are on the right track here

Look at this...searching my e-books:
DTC114 = AA1A4M, RN1002, UN4211, 2SC3402
DTA114= AN1A4AM, RN2224, UN4123, 2SA1522, 2SA1526

Now, digging a little further gives us the following results:

The father and mother of the family are:
AA1A3Q :Silicon NPN-transistor+integrated resistor S, Rb=1k,
Rbe=10kohm, 60V, 0,1A, 0,25W

AN1A3Q :Silicon PNP-transistor+integrated resistor S, Rb=1k,
Rbe=10kohm, 60V, 0,1A, 0,25W

Brothers and sisters:
AA1A4M: =AA 1A3Q: Rb=Rbe=10k
AA1A4P: =AA 1A3Q: Rb=10k, Rbe=47k
AA1A4Z: =AA 1A3Q: Rb=10k, Rbe=-
AA1F4M: =AA 1A3Q: Rb=Rbe=22k
AA1F4N: =AA 1A3Q: Rb=22k, Rbe=47k
AA1F4Z: =AA 1A3Q: Rb=22k, Rbe=-
AA1L3M: =AA 1A3Q: Rb=Rbe=4,7k
AA1L3N: =AA 1A3Q: Rb=4,7k, Rbe=10k
AA1L3Z: =AA 1A3Q: Rb=4,7k, Rbe=-
AA1L4L: =AA 1A3Q: Rb=47k, Rbe=22k
AA1L4M: =AA 1A3Q: Rb=Rbe=47k
AA1L4Z: =AA 1A3Q: Rb=47k, Rbe=-

Same scheme for PNP:clown:

They are all made by NEC so we shouldn't blame Sony
:)

Here are the datasheet lists from NEC:
http://www.necel.com/discrete/engli...ilt_in/aa1.html but I think they
will be pretty much the same as the DTA and DTC's from Elso

Thanks to you all!

/Hugo - always digging a little deeper :)
Something missing in the URLs above, but this one tells most of the
story: http://www.onsemi.com/pub/Collateral/DTA114E-D.PDF

So I went to ON Semi and found them. Mystery solved for the most
part. Oddly, the board that these "digital transistors" were in is
packed with analog circuits. :p


--
@@F@r@o@m@@O@r@a@n@g@e@@C@o@u@n@t@y@,@@C@a@l@,@@w@h@e@r@e@@
###Got a Question about ELECTRONICS? Check HERE First:###
http://users.pandora.be/educypedia/electronics/databank.htm
My email address is whitelisted. *All* email sent to it
goes directly to the trash unless you add NOSPAM in the
Subject: line with other stuff. alondra101 <at> hotmail.com
Don't be ripped off by the big book dealers. Go to the URL
that will give you a choice and save you money(up to half).
http://www.everybookstore.com You'll be glad you did!
Just when you thought you had all this figured out, the gov't
changed it: http://physics.nist.gov/cuu/Units/binary.html
@@t@h@e@@a@f@f@l@u@e@n@t@@m@e@e@t@@t@h@e@@E@f@f@l@u@e@n@t@@
 
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