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Old 22nd June 2010, 04:14 AM   #1
iko is offline iko  Canada
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Default 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
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Old 22nd June 2010, 05:01 AM   #2
EUVL is offline EUVL  Europe
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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
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Old 22nd June 2010, 09:43 PM   #3
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digikey has them for 0.85CDN dollars which is a lot more than what the bf862 costs. Not worth it, indeed.
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Old 22nd June 2010, 10:08 PM   #4
EUVL is offline EUVL  Europe
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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.
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Old 22nd June 2010, 10:18 PM   #5
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Also lower Vds and Power dissipation. However you could always cascode I suppose.
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Old 22nd June 2010, 10:19 PM   #6
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2SK771 at digikey

MOSFET N-CH 40V 20MA 3CP - 2SK771-5-TB-E
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Old 22nd June 2010, 10:26 PM   #7
EUVL is offline EUVL  Europe
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Yes but that's Rank 5. I was looking for Rank 4 (lower Idss).
DK has what SanyoDirect offers, nothing else.


Patrick
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Old 22nd June 2010, 10:27 PM   #8
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I will keep looking
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Old 22nd June 2010, 10:33 PM   #9
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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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Old 22nd January 2013, 07:18 AM   #10
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Quote:
Originally Posted by EUVL View Post
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
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