Has anyone used this transistor?

[KORGULL]

HI,
I have about 20 of these transistors that were in a grab bag mix I bought a few months ago.
Part# A854QE
The case looks like a half-size TO-92 type. It has a silver/gray face.
I checked it in my cross reference book and got the NTE# - 290A.
Looked it up on NTE site- //www.nteinc.com/specs/200to299/NTE289A.html It is a PNP silicon complementary audio power amplifier.

O.K. so I have the technical specs on the NTE equivalent, but I can't find any other info. I am not experienced enough to know from these specs exactly what I can do with it. Is it a decent, useful component, or a noisy relic that only has one specialized application that is useless to me? (the case with much of the surplus grab bag junk that I am a sucker for)

Any input will be appreciated especially if you have used this part or could point me to a schematic that includes it. If someone could analyze the datasheet and theorize about its use, that would be cool too. I already searched this site, and google and found nothing. Can It be used in a guitar amp design? If so, how powerful of an amp?

Hope this isn't too stupid a question. I've just been having a hard time finding info about this on my own.

[David]

HI,
I have about 20 of these transistors that were in a grab bag mix I bought a few months ago.
Part# A854QE
The case looks like a half-size TO-92 type. It has a silver/gray face.
I checked it in my cross reference book and got the NTE# - 290A.
Looked it up on NTE site- //www.nteinc.com/specs/200to299/NTE289A.html It is a PNP silicon complementary audio power amplifier.

O.K. so I have the technical specs on the NTE equivalent, but I can't find any other info. I am not experienced enough to know from these specs exactly what I can do with it. Is it a decent, useful component, or a noisy relic that only has one specialized application that is useless to me? (the case with much of the surplus grab bag junk that I am a sucker for)

Any input will be appreciated especially if you have used this part or could point me to a schematic that includes it. If someone could analyze the datasheet and theorize about its use, that would be cool too. I already searched this site, and google and found nothing. Can It be used in a guitar amp design? If so, how powerful of an amp?

Hope this isn't too stupid a question. I've just been having a hard time finding info about this on my own.

You need to look at the datasheet more closely.  These are transistor pairs.  The latter is a NPN/PNP pair.

[bioroids]

Hi, i think this is the datasheet:

http://alldatasheet.com/datasheet-pdf/view/ROHM/2SA854.html

Does it look like your transistor?

the Q prefix indicates the gain group, in this case like 120-250 hfe

It's a medium power silicon PNP, i think you can use it anywhere a PNP transistor goes (in stompbox circuits).

Luck

Miguel

[KORGULL]

bioroids wrote:

Hi, i think this is the datasheet:

http://alldatasheet.com/datasheet-pdf/view/ROHM/2SA854.html

Does it look like your transistor?

the Q prefix indicates the gain group, in this case like 120-250 hfe

It's a medium power silicon PNP, i think you can use it anywhere a PNP transistor goes (in stompbox circuits).

Yes, that looks like the right sheet. Thanks for the info. I will just try it out in some circuits soon and see what happens.
David wrote:

You need to look at the datasheet more closely. These are transistor pairs. The latter is a NPN/PNP pair.

I did see that (figured that's why they call it a complementary transistor)
but is it a requirement or an option that it be used in a pair? I thought there was a good chance it could still be used on its own.

[Paul Perry (Frostwave)]

Oh yes, you can use it on its own, no problem.

[David]

bioroids wrote:

Hi, i think this is the datasheet:

http://alldatasheet.com/datasheet-pdf/view/ROHM/2SA854.html

Does it look like your transistor?

the Q prefix indicates the gain group, in this case like 120-250 hfe

It's a medium power silicon PNP, i think you can use it anywhere a PNP transistor goes (in stompbox circuits).

Yes, that looks like the right sheet. Thanks for the info. I will just try it out in some circuits soon and see what happens.
David wrote:

You need to look at the datasheet more closely. These are transistor pairs. The latter is a NPN/PNP pair.

I did see that (figured that's why they call it a complementary transistor)
but is it a requirement or an option that it be used in a pair? I thought there was a good chance it could still be used on its own.

Korgull:

I wasn't trying to get on your case.  I was trying to make a point...  which evidently I didn't.  Remember the part where 289 represented a matched pair of PNP transistors?

Think positive ground PNP Fuzz Face, man!

[KORGULL]

David wrote:

Korgull:

I wasn't trying to get on your case. I was trying to make a point... which evidently I didn't. Remember the part where 289 represented a matched pair of PNP transistors?

Think positive ground PNP Fuzz Face, man!

OOOOOhhhhhh, now I see.
          I may need things spelled out clearly for a little while yet. I've only been cruisin' the stompbox sites for several weeks, so I'm not too quick to pick up on some things (have some general electronics knowledge). I've done more information gathering than actual building at this point, so I've not built a fuzz face yet.
     I have read and printed out much good info about them, but need to read over again and build one before everything sinks in. From what I remember, I was under the impression they only used germanium.
     
       ...O.K decided to skim through a couple articles right now. I see they can sound good with silicon, just not as smooth, more of a harsh edge?
  -I might like that.
      Thanks for the tip, I am probably going to put together a fuzz face in the next couple weeks. I'll give this thing a try in it.
      I have accumulated about 50 different transistors(don't think any are GE though :cry: ) can't wait to start experimenting. This A854 type doesn't look like any I have ever seen - thought it might have some specialized purpose. Good to know I can put it to use.