Low noise jfet 2sk3557

iko · 22nd June 2010, 04:14 AM

Looking for more info about, possible experience with, or measurements of the 2sk3557 from Sanyo. The data sheet claims ultra-low noise, low capacitance, and high gm. Wonder how it compares to bf862 for instance.

SANYO: 2SK3557

EUVL · 22nd June 2010, 05:01 AM

Specs including Ciss and noise are similar to BF862.
But good to know one can buy direct, even though USD3- for a SOT23 JFET !!

Patrick

iko · 22nd June 2010, 09:43 PM

digikey has them for 0.85CDN dollars which is a lot more than what the bf862 costs. Not worth it, indeed.

EUVL · 10:24 PM

I have been looking for it 2 years ago, including trying to source from Japan, to no vail.
All of a sudden, you manage to name 2 sources.

Sanyo direct was non-existent then, and DK did not have it.
Now even Farnell has it, and is cheaper than DK for a change (at least in the EU) and almost same price as BF862.
But then both of them are Rank 7, which is just the same as BF862. And I was looking for Rank 6 (more friendly Idss).

Another one I was trying to find was 2SK771 Rank 4, equally unobtainium.
Also 2SK3666 Rank 4. Rank 3 is available at DK.

Patrick

Melon Head · 22nd June 2010, 10:18 PM

Also lower Vds and Power dissipation. However you could always cascode I suppose.

Melon Head · 22nd June 2010, 10:19 PM

2SK771 at digikey

MOSFET N-CH 40V 20MA 3CP - 2SK771-5-TB-E

EUVL · 22nd June 2010, 10:26 PM

Yes but that's Rank 5. I was looking for Rank 4 (lower Idss).
DK has what SanyoDirect offers, nothing else.

Patrick

Melon Head · 22nd June 2010, 10:27 PM

I will keep looking

Melon Head · 10:39 PM

2SK771-4

http://neke.hkinventory.com/eCatalog...fferSearch.asp

I have never purchased anything through this means before. You would hope that they were a credible business.

Valeriano · 22nd January 2013, 07:18 AM

Quote:

Originally Posted by EUVL

I have been looking for it 2 years ago, including trying to source from Japan, to no vail.
All of a sudden, you manage to name 2 sources.

Sanyo direct was non-existent then, and DK did not have it.
Now even Farnell has it, and is cheaper than DK for a change (at least in the EU) and almost same price as BF862.
But then both of them are Rank 7, which is just the same as BF862. And I was looking for Rank 6 (more friendly Idss).

Another one I was trying to find was 2SK771 Rank 4, equally unobtainium.
Also 2SK3666 Rank 4. Rank 3 is available at DK.

Patrick

Hi Patrick,

rank 6 is now available on mouser, good price break at 100 units.

mouser item 863-2SK3557-6-TB-E

cheers
Valeriano

22nd June 2010, 04:14 AM	#1
iko diyAudio Moderator Join Date: May 2008 Location: Toronto	Low noise jfet 2sk3557 Looking for more info about, possible experience with, or measurements of the 2sk3557 from Sanyo. The data sheet claims ultra-low noise, low capacitance, and high gm. Wonder how it compares to bf862 for instance. SANYO: 2SK3557

22nd June 2010, 10:08 PM	#4
EUVL diyAudio Member Join Date: Oct 2003	I have been looking for it 2 years ago, including trying to source from Japan, to no vail. All of a sudden, you manage to name 2 sources. Sanyo direct was non-existent then, and DK did not have it. Now even Farnell has it, and is cheaper than DK for a change (at least in the EU) and almost same price as BF862. But then both of them are Rank 7, which is just the same as BF862. And I was looking for Rank 6 (more friendly Idss). Another one I was trying to find was 2SK771 Rank 4, equally unobtainium. Also 2SK3666 Rank 4. Rank 3 is available at DK. Patrick Last edited by EUVL; 22nd June 2010 at 10:24 PM.

22nd June 2010, 10:33 PM	#9
Melon Head Banned Join Date: Nov 2006	2SK771-4 http://neke.hkinventory.com/eCatalog...fferSearch.asp I have never purchased anything through this means before. You would hope that they were a credible business. Last edited by Melon Head; 22nd June 2010 at 10:39 PM.

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22nd June 2010, 05:01 AM	#2
EUVL diyAudio Member Join Date: Oct 2003	Specs including Ciss and noise are similar to BF862. But good to know one can buy direct, even though USD3- for a SOT23 JFET !! Patrick

22nd June 2010, 09:43 PM	#3
iko diyAudio Moderator Join Date: May 2008 Location: Toronto	digikey has them for 0.85CDN dollars which is a lot more than what the bf862 costs. Not worth it, indeed.

22nd June 2010, 10:18 PM	#5
Melon Head Banned Join Date: Nov 2006	Also lower Vds and Power dissipation. However you could always cascode I suppose.

22nd June 2010, 10:19 PM	#6
Melon Head Banned Join Date: Nov 2006	2SK771 at digikey MOSFET N-CH 40V 20MA 3CP - 2SK771-5-TB-E

22nd June 2010, 10:26 PM	#7
EUVL diyAudio Member Join Date: Oct 2003	Yes but that's Rank 5. I was looking for Rank 4 (lower Idss). DK has what SanyoDirect offers, nothing else. Patrick

22nd June 2010, 10:27 PM	#8
Melon Head Banned Join Date: Nov 2006	I will keep looking

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