Why no H11F1 OptoFET?

[Eeyore]

Lostgallifreyan wrote:

Eeyore wrote

Whose do you think?

I was asking you. You didn't specify and I don't believe in making
guesses. How about specifying which uses you think are uniquely
suitable to opto-fets ?

Given only two or three firms mentioned, and one that comes up for most
Google results, you didn't have to guess, you had to think.

Let me give you some advice.

Making assumptions may seem clever and time-saving but it's not. It's another
word for a guess and it's very likely to be wrong at least half of the time.

Assumptions have created disasers. Don't make them. Either you know something or
you don't. There is no inbetween. If in doubt ASK !

Graham

 

[Lostgallifreyan]

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote in
news:4650270A.92C906F4@hotmail.com:

I rather doubt that. They probably picked up some equivalents...

Do you know of any, specifically? That would be help I can use, if you can
name some.

 

[Eeyore]

Lostgallifreyan wrote:

Eeyore wrote

As for 'unique': unfair question, and you know it.

Wrong. It's highly relevant.

There are often other ways to do things, the question is which is best.

Or cheapest. Or most convenient. Or uses up the dead stock on-hand.

A lot of things justify this part type

I'd like to see you justify them. I disagree that they are widely justified in
fact.

, as the makers obviously realised. If a lot of people choose
not to use them, fine, but when you want the resistor-like behaviour of a
FET without the complications of a bipolar type, and the total electrical
isolation that this part offers, an optoFET is the best part to choose.

FETs aren't actually that resistor like except at very small signal amplitudes.
Beyond that, linearirty goes to pot.

You're asking the wrong question. Instead of asking me why the part should
exist, ask the makers. All of them.

I don't need to.

I can see why the part is being obsoleted. You can't however it seems. The
suggested applications themselves are obsolete. That's why.


Graham

 

[Eeyore]

Lostgallifreyan wrote:

Eeyore wrote

You remind me of the guys (so-called designers) who would get all
excited over RS introducing some new exotic expensive part into their
catalogue who then felt obliged to design it in to their employer's
products and design the company into financial failure.


Wrong. I try to use basic parts where possible. I just happen to consider
an optoFET as a basic part,

Ł2.50

just as a bipolar optoisolator is a basic part.

25p !

The opto-fet is far too expensive to be considered a basic part. It's a boutique
part.

Graham

 

[Lostgallifreyan]

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote in
news:4650270A.92C906F4@hotmail.com:

http://www.sbcds.com.cn/en/Products.asp?Cid=172

Interesting, but a poor range of resitance between light/dark.

 

[Eeyore]

Lostgallifreyan wrote:

Eeyore wrote

I rather doubt that. They probably picked up some equivalents...

Do you know of any, specifically? That would be help I can use, if you can
name some.

H11F3 is cheaper.
http://uk.farnell.com/jsp/search/browse.jsp?N=411+1000145&Ntk=gensearch_001&Ntt=optocoupler+fet+output&Ntx=

 

[Lostgallifreyan]

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote in
news:46502A5F.F5992913@hotmail.com:

FETs aren't actually that resistor like except at very small signal
amplitudes. Beyond that, linearirty goes to pot.

The F11F1 is specified to 99.9% linearity. Sounds ok to me.

 

[Eeyore]

Lostgallifreyan wrote:

Eeyore wrote

http://www.sbcds.com.cn/en/Products.asp?Cid=172

Interesting, but a poor range of resitance between light/dark.

Adequate for most applications. It's no trouble getting 90dB attenuation.

Graham

 

[Lostgallifreyan]

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote in
news:46502B64.B3D5FBFA@hotmail.com:

Lostgallifreyan wrote:

Eeyore wrote

You remind me of the guys (so-called designers) who would get all
excited over RS introducing some new exotic expensive part into
their catalogue who then felt obliged to design it in to their
employer's products and design the company into financial failure.


Wrong. I try to use basic parts where possible. I just happen to
consider an optoFET as a basic part,

Ł2.50

just as a bipolar optoisolator is a basic part.

25p !

The opto-fet is far too expensive to be considered a basic part. It's
a boutique part.

Graham

And the laser diode it will be protecting and modulating is worth ten times
more. Possibly hundreds of times more. Are those boutique parts too, or are
you just trying to be derogatory for fun? I paid a lot less than Ł2.50 per
H11F1 even though I only bought twenty. Several basic op-amps cost more
each.

 

[Eeyore]

Lostgallifreyan wrote:

Eeyore wrote

FETs aren't actually that resistor like except at very small signal
amplitudes. Beyond that, linearirty goes to pot.

The F11F1 is specified to 99.9% linearity. Sounds ok to me.

You've clearly misunderstood the data sheet. What I mention is inherent to all
jfets.

Graham

 

[Lostgallifreyan]

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote in
news:46502C1F.41C451DA@hotmail.com:

Lostgallifreyan wrote:

Eeyore wrote

I rather doubt that. They probably picked up some equivalents...

Do you know of any, specifically? That would be help I can use, if
you can name some.

H11F3 is cheaper.
http://uk.farnell.com/jsp/search/browse.jsp?N=411+1000145&Ntk=gensearch
_001&Ntt=optocoupler+fet+output&Ntx=

Yes, I might use those. Right now I'm testing stuff, if I can relax
restrictions I will. Not much good if all the H11F's are being dumped
though.

 

[Eeyore]

Lostgallifreyan wrote:

I paid a lot less than Ł2.50 per H11F1 even though I only bought twenty.

But you won't be able to buy them at all soon it seems.

Graham

 

[Lostgallifreyan]

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote in
news:46502D28.D1B43B7@hotmail.com:

Lostgallifreyan wrote:

Eeyore wrote

FETs aren't actually that resistor like except at very small signal
amplitudes. Beyond that, linearirty goes to pot.

The F11F1 is specified to 99.9% linearity. Sounds ok to me.

You've clearly misunderstood the data sheet. What I mention is
inherent to all jfets.

So long as it's there, I can scale it to the range I need.

 

[catguy]

"Lostgallifreyan" <no-one@nowhere.net> wrote in message
news:Xns9936643039591zoodlewurdle@140.99.99.130...

Eeyore <rabbitsfriendsandrelations@hotmail.com> wrote in
news:46500479.990B3BA7@hotmail.com:



Lostgallifreyan wrote:

The H11F1 is (was) multisourced, Fairchild, Isocom, and possibly
others. I bought 20 from Digikey only a few weeks ago. Now they have
none in stock

Farnell has some.
http://uk.farnell.com/jsp/search/browse.jsp?N=411&Ntk=gensearch_001&Ntt
=h11f1&Ntx=&_requestid=111596

Graham



So do RS. But for how long? I'm not thinking about the few drying pools
left, I can raid a couple of those if I need (and I will, as the NTE3085
that Gordon posted about costs at least double). I didn't raise a new
thread to find a handful, but to question what looks like the end of the
line for something that showed every indication of being new. It reminds
me
of a news story about a village that grew daffodils for a show, and whose
occupants woke one morning to find someone had cut all the buds off during
the night. This obviously isn't the dying end of an old product no-one
needs anymore, so what's going on?

Newark has lots of them......Paul

http://www.newark.com/jsp/search/productdetail.jsp?SKU=72K8637&CMP=AFC-QO1721829242

 

[Michael A. Terrell]

"gordon.mott@gmail.com" wrote:

On May 20, 6:11 am, Lostgallifreyan <no-...@nowhere.net> wrote:
Eeyore <rabbitsfriendsandrelati...@hotmail.com> wrote innews:46501AD5.F7B253CC@hotmail.com:

Because I'm curious why you need it and maybe I could have offered
another solution.

Not interested. I'm not so blind I can't see alternatives, or that your
offer is really based on your desire to show that I'm wrong. Don't bother.
If you want to impress, show why the makers of that IC, Isocom, Fairchild,
and the form NTE that have emulated it and justify more than double the
cost see fit to make them in the first place. If you can show why all those
people are wrong, I'll be mightily impressed, believe me.

Dude... seriously. Go take a prozac or something. I get the
impression Eeyore is only trying to help.

Then you are wrong. He is a petty, depressed person with serious
mental problems. He lives to argue, lies through his teeth, and in
general is a total waste of time. He despises anyone outside of
England, and loves to talk about killing Americans. he wants everyone
to be as miserable as he is.

Since you use Google Groups you can't see the continuous stream of
garbage he dumps on news:alt.binaries.schematics.electronic but some can
be seen on news:sci.electronics.design or
http://groups.google.com/group/sci.electronics.design?hl=en




--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Lostgallifreyan]

"catguy" <news01S-P-A-M-B-L-O-C-K@packratpaul.com> wrote in
news:Gk_3i.167134$jt2.95450@newsfe13.lga:

Newark has lots of them......Paul

http://www.newark.com/jsp/search/productdetail.jsp?SKU=72K8637&CMP=AFC-
QO1721829242

Nice find, price is good too. I don't know how long they'll have them, but
I think I'll ask my US friend who helped me get the last lot. Thankyou.

 

[Michael A. Terrell]

Lostgallifreyan wrote:

"catguy" <news01S-P-A-M-B-L-O-C-K@packratpaul.com> wrote in
news:Gk_3i.167134$jt2.95450@newsfe13.lga:

Newark has lots of them......Paul

http://www.newark.com/jsp/search/productdetail.jsp?SKU=72K8637&CMP=AFC-
QO1721829242


Nice find, price is good too. I don't know how long they'll have them, but
I think I'll ask my US friend who helped me get the last lot. Thankyou.

Newark IS Farnell.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Lostgallifreyan]

"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in
news:465097CC.2E5C3E5E@earthlink.net:

Nice find, price is good too. I don't know how long they'll have
them, but I think I'll ask my US friend who helped me get the last
lot. Thankyou.


Newark IS Farnell.

Point taken, but the price difference is large. In modest quantities that's
much less than half the cost, buying from the US, even after Paypal fees
and exchange rate conversion and postage costs.

 

[Eeyore]

Lostgallifreyan wrote:

Eeyore wrote
Lostgallifreyan wrote:
Eeyore wrote

FETs aren't actually that resistor like except at very small signal
amplitudes. Beyond that, linearirty goes to pot.

The F11F1 is specified to 99.9% linearity. Sounds ok to me.

You've clearly misunderstood the data sheet. What I mention is
inherent to all jfets.

So long as it's there, I can scale it to the range I need.

You lose signal to noise ratio by scaling the input unfortunately.

Graham

 

[gordon.mott@gmail.com]

On May 20, 3:00 pm, Lostgallifreyan <no-...@nowhere.net> wrote:

"Michael A. Terrell" <mike.terr...@earthlink.net> wrote innews:465097CC.2E5C3E5E@earthlink.net:

Nice find, price is good too. I don't know how long they'll have
them, but I think I'll ask my US friend who helped me get the last
lot. Thankyou.

Newark IS Farnell.

Point taken, but the price difference is large. In modest quantities that's
much less than half the cost, buying from the US, even after Paypal fees
and exchange rate conversion and postage costs.

Doesn't Newark still have something like a $200 minimum order?