Identification of transistors

[Pier Federici]

TIA.

I have three transistors that I have been unable to identify.

I understand that the 185 prefix identifies the chips as Motorola and I
think that the MEX means that they are made in Mexico.

All of the markings on chip 1 (T03 package)
1853-0511
MEX
8535

All of the markings on chip 2 (T03 package)
1854-0774
MEX
8533

All of the markings on chip 3
4-892
HP
RCA 523

Can anyone help?

 

[Colin Horsley]

"Pier Federici" <a@a.a> wrote in message
news:42c63f09$0$20026$afc38c87@news.optusnet.com.au...

TIA.

I have three transistors that I have been unable to identify.

I understand that the 185 prefix identifies the chips as Motorola and I
think that the MEX means that they are made in Mexico.

All of the markings on chip 1 (T03 package)
1853-0511
MEX
8535

All of the markings on chip 2 (T03 package)
1854-0774
MEX
8533

All of the markings on chip 3
4-892
HP
RCA 523

Can anyone help?

1853 and 1854 look like Hewlett Packard Numbers. the 4-892 is probably as well.
My cross reference list does not have the 1853-0511.
and the 1854-0774 I can't read. it looks like 2N6056. Sorry Colin

 

[Pier Federici]

1853 and 1854 look like Hewlett Packard Numbers. the 4-892 is probably as
well.
My cross reference list does not have the 1853-0511.
and the 1854-0774 I can't read. it looks like 2N6056. Sorry
Colin


Thanks Colin.

OK I forgot to tell you that I grabbed the components out of an old HP pen
plotter.
The 4 on the 1854-0774 and the 11 on the 1853-0511 look like they were added
after the other numbers (type spacing and thickness of font).

 

[Jim Adney]

On Sat, 2 Jul 2005 17:17:21 +1000 "Pier Federici" <a@a.a> wrote:

I have three transistors that I have been unable to identify.

These are all HP part #s. 4-892 is probably shorthand for 1854-0892,
which is what they did when the part was too small for the whole
number.

All of the markings on chip 1 (T03 package)
1853-0511

Not on my list

All of the markings on chip 2 (T03 package)
1854-0774

2N6056

All of the markings on chip 3
4-892

not on my list

-
-----------------------------------------------
Jim Adney jadney@vwtype3.org
Madison, WI 53711 USA
-----------------------------------------------

 

[Franc Zabkar]

On Sat, 2 Jul 2005 20:36:16 +1000, "Pier Federici" <a@a.a> put finger
to keyboard and composed:

1853 and 1854 look like Hewlett Packard Numbers. the 4-892 is probably as
well.
My cross reference list does not have the 1853-0511.
and the 1854-0774 I can't read. it looks like 2N6056. Sorry
Colin


Thanks Colin.
OK I forgot to tell you that I grabbed the components out of an old HP pen
plotter.
The 4 on the 1854-0774 and the 11 on the 1853-0511 look like they were added
after the other numbers (type spacing and thickness of font).

Could 1853-0511 be the PNP complement to the 2N6056, ie a 2N6054? Does
it test as a PNP Darlington? Were these transistors driving the XY
motors?


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.

 

[Pier Federici]

1853 and 1854 look like Hewlett Packard Numbers. the 4-892 is probably
as well.
My cross reference list does not have the 1853-0511.
and the 1854-0774 I can't read. it looks like 2N6056. Sorry
Colin


Thanks Colin.
OK I forgot to tell you that I grabbed the components out of an old HP
pen
plotter.
The 4 on the 1854-0774 and the 11 on the 1853-0511 look like they were
added
after the other numbers (type spacing and thickness of font).

Could 1853-0511 be the PNP complement to the 2N6056, ie a 2N6054? Does
it test as a PNP Darlington? Were these transistors driving the XY
motors?

Thanks for the help guys. Yes the circuit drove the X and Y axis motors and
the pen up and down.
Pier