U244 anyone?

scott wurcer · 28th November 2012, 07:45 PM

I had to hit the archives to help out a friend and found something that has escaped my attention for 35yrs. Intersil had in their catalog a U244 JFET with a ~1A Idss and in a 10W screw lug package. A few of these would have made a nice Zen project a LONG time ago.

Not one hit here or much on the web either.

Nelson Pass · 28th November 2012, 07:48 PM

Let me know when you get some!

Got any curves on it?

Michael Rothacher · 28th November 2012, 08:19 PM

Oh, those old things. I've got boxes of those.

Zen Mod · 28th November 2012, 09:24 PM

Michael Rothacher · 29th November 2012, 12:00 AM

Sorry, I was being wicked.

Here's the only info I could find on them:

N-Channel JFET
Vishay Siliconix
N-Channel JFET,FETs,JFETs,Junction FETs
V(BR)GSS (V)=25
I(D) Abs. Drain Current (A)=900m
Absolute Max. Power Diss. (W)=10
I(GSS) Max. (A)=1.0n
V(GS)off Max. (V)=8.0
I(DSS) Min. (A)=900m
g(fs) Min. (S) Trans. conduct.=80m
g(fs) Max, (S) Trans. conduct,=200m
@V(DS) (V) (Test Condition)=10
C(iss) Max. (F)=35p
Status=Discontinued
Package=TO-210AB
Military=N

Loudthud · 29th November 2012, 12:32 AM

Any idea what the die size is? Siliconix and Intersil usually had the die specs in the back of their data books. The J105 and U290 use a .048 inch square (1.143mm) die and have an on resistance of less than 3 ohms. Problem was that they were in TO-92 or TO-52 packages. The J105 is still made so at least you can get unpackaged chips. The bad thing is that the back of the die is the Gate contact which would probably be the surface attached to the heat sink tab.

scott wurcer · 29th November 2012, 01:08 AM

Quote:

Originally Posted by Loudthud

Any idea what the die size is? Siliconix and Intersil usually had the die specs in the back of their data books. The J105 and U290 use a .048 inch square (1.143mm) die and have an on resistance of less than 3 ohms. Problem was that they were in TO-92 or TO-52 packages. The J105 is still made so at least you can get unpackaged chips. The bad thing is that the back of the die is the Gate contact which would probably be the surface attached to the heat sink tab.

I'll scan what I have tomorrow, this looks to be hopelessly obscure.

scott wurcer · 29th November 2012, 01:20 AM

Quote:

Originally Posted by Nelson Pass

Let me know when you get some!

Got any curves on it?

I figure these are on the level of the golden fleece. Send me your Argonauts

Michael Rothacher · 29th November 2012, 01:23 PM

We love a good unicorn hunt.

Nelson Pass · 29th November 2012, 11:45 PM

Lacking that, we can always parallel a hundred 2SK170's.

28th November 2012, 07:45 PM	#1
scott wurcer diyAudio Member Join Date: Jan 2004 Location: cambridge ma	U244 anyone? I had to hit the archives to help out a friend and found something that has escaped my attention for 35yrs. Intersil had in their catalog a U244 JFET with a ~1A Idss and in a 10W screw lug package. A few of these would have made a nice Zen project a LONG time ago. Not one hit here or much on the web either. __________________ Clay is embedded in our subconscious. It has been there for at least 50,000 years.

28th November 2012, 08:19 PM	#3
Michael Rothacher www.audiohobby.com diyAudio Member Join Date: May 2001 Blog Entries: 3	Oh, those old things. I've got boxes of those. __________________ My Website, Projects, Sale Items

28th November 2012, 09:24 PM	#4
Zen Mod diyAudio Member Join Date: Jan 2003 Location: ancient Batsch , behind Iron Curtain	__________________ my Papa is smarter than your Nelson ! tnx to clean thread ; Cook Book ; PSM LS Cook Book ; Baby Diyaudio FORUM ; Mighty ZM's Bloggg;I'm dumb

29th November 2012, 12:00 AM	#5
Michael Rothacher www.audiohobby.com diyAudio Member Join Date: May 2001 Blog Entries: 3	Sorry, I was being wicked. Here's the only info I could find on them: N-Channel JFET Vishay Siliconix N-Channel JFET,FETs,JFETs,Junction FETs V(BR)GSS (V)=25 I(D) Abs. Drain Current (A)=900m Absolute Max. Power Diss. (W)=10 I(GSS) Max. (A)=1.0n V(GS)off Max. (V)=8.0 I(DSS) Min. (A)=900m g(fs) Min. (S) Trans. conduct.=80m g(fs) Max, (S) Trans. conduct,=200m @V(DS) (V) (Test Condition)=10 C(iss) Max. (F)=35p Status=Discontinued Package=TO-210AB Military=N __________________ My Website, Projects, Sale Items

29th November 2012, 01:23 PM	#9
Michael Rothacher www.audiohobby.com diyAudio Member Join Date: May 2001 Blog Entries: 3	We love a good unicorn hunt. __________________ My Website, Projects, Sale Items


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28th November 2012, 07:48 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	Let me know when you get some! Got any curves on it?

29th November 2012, 12:32 AM	#6
Loudthud diyAudio Member Join Date: Nov 2007 Location: Near Dallas Texas USA	Any idea what the die size is? Siliconix and Intersil usually had the die specs in the back of their data books. The J105 and U290 use a .048 inch square (1.143mm) die and have an on resistance of less than 3 ohms. Problem was that they were in TO-92 or TO-52 packages. The J105 is still made so at least you can get unpackaged chips. The bad thing is that the back of the die is the Gate contact which would probably be the surface attached to the heat sink tab.

29th November 2012, 11:45 PM	#10
Nelson Pass The one and only Join Date: Mar 2001	Lacking that, we can always parallel a hundred 2SK170's.

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