Monlithic transistor IC for input stage design? - Page 2

PH104 · 15th June 2009, 04:43 PM

bitrex -- What voltage ratings are you looking for? How many transistors on the chip? PNP or NPN or both?

sidiy · 15th June 2009, 04:48 PM

beat that

2SC3067 dual npn (Sanyo) - from ampslab (20pcs for 20 $)
2SC3381, 2SA1349 duals (Toshiba) - from bdent (6-7 $ each)

Good for the purpose (excellent Vce,....)

PH104 · 15th June 2009, 05:05 PM

I just ordered the 2SC3381 from Consolidated for $1.15 each. He was out of the 2SA1349s.

Thanks for the tip on the Sanyo dual. Other matched duals I'm looking at for a power amp are the Zetex/Diodes Inc. DMMT5551 and DMT5401 in a surface mount package, matched to 2%. $0.50 from Mouser or Digi-key.

I also like the packages mllyod1 recommended. I bought some from Jameco a few years ago -- have no idea if they are still available there.

mlloyd1 · 15th June 2009, 09:37 PM

just a friendly tip - somebody on this board has "official" (i.e. not fake) 2SA1349 and 2SC3381 (both GR Hfe grade) for sale.

i just got some myself ...

you can find MPQxxxx sometimes at surplus mailorder places. they are certainly not the ultimate if you need guaranteed precision/low noise/bandwidth/etc... , but for how we use them around here, they usually work just fine. my experience has been similar to euvl's - all the ones i've had/used were pretty far above spec.

mlloyd1

Quote:

Originally posted by PH104
I just ordered the 2SC3381 from Consolidated for $1.15 each. He was out of the 2SA1349s.

Thanks for the tip on the Sanyo dual. Other matched duals I'm looking at for a power amp are the Zetex/Diodes Inc. DMMT5551 and DMT5401 in a surface mount package, matched to 2%. $0.50 from Mouser or Digi-key.

I also like the packages mllyod1 recommended. I bought some from Jameco a few years ago -- have no idea if they are still available there. [/B]

PH104 · 16th June 2009, 01:19 AM

Does anyone know of a matched quad npn with Vbe greater than 60V (80V or more would be great)?

Mr Evil · 16th June 2009, 01:29 AM

While we're asking about these things: Is there such a thing as a medium power array? Anything from a couple of watts per transistor up.

Bitrex · 24th June 2009, 01:23 AM

I'm sorry I haven't had a chance to respond to this thread, I found this today while hunting around:
http://www.alliedelec.com/Search/Pro...1&MPN=MAT04FPZ

But they aren't in stock!

15th June 2009, 04:43 PM	#11
PH104 diyAudio Member Join Date: Nov 2001 Location: New Mexico	bitrex -- What voltage ratings are you looking for? How many transistors on the chip? PNP or NPN or both? __________________ "When I read about the evils of drinking, I gave up reading." -- Henny Youngman

15th June 2009, 05:05 PM	#13
PH104 diyAudio Member Join Date: Nov 2001 Location: New Mexico	I just ordered the 2SC3381 from Consolidated for $1.15 each. He was out of the 2SA1349s. Thanks for the tip on the Sanyo dual. Other matched duals I'm looking at for a power amp are the Zetex/Diodes Inc. DMMT5551 and DMT5401 in a surface mount package, matched to 2%. $0.50 from Mouser or Digi-key. I also like the packages mllyod1 recommended. I bought some from Jameco a few years ago -- have no idea if they are still available there. __________________ "When I read about the evils of drinking, I gave up reading." -- Henny Youngman

16th June 2009, 01:19 AM	#15
PH104 diyAudio Member Join Date: Nov 2001 Location: New Mexico	Does anyone know of a matched quad npn with Vbe greater than 60V (80V or more would be great)? __________________ "When I read about the evils of drinking, I gave up reading." -- Henny Youngman

16th June 2009, 01:29 AM	#16
Mr Evil diyAudio Member Join Date: Aug 2004 Location: Behind you	While we're asking about these things: Is there such a thing as a medium power array? Anything from a couple of watts per transistor up. __________________ https://mrevil.asvachin.eu/

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15th June 2009, 04:48 PM	#12
sidiy diyAudio Member Join Date: Sep 2005 Location: Montreal	beat that 2SC3067 dual npn (Sanyo) - from ampslab (20pcs for 20 $) 2SC3381, 2SA1349 duals (Toshiba) - from bdent (6-7 $ each) Good for the purpose (excellent Vce,....)

24th June 2009, 01:23 AM	#17
Bitrex diyAudio Member Join Date: Jan 2009	I'm sorry I haven't had a chance to respond to this thread, I found this today while hunting around: http://www.alliedelec.com/Search/Pro...1&MPN=MAT04FPZ But they aren't in stock!

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