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Why no H11F1 OptoFET?

E

Eeyore

Jan 1, 1970
0
Lostgallifreyan said:
Eeyore wrote


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
 
L

Lostgallifreyan

Jan 1, 1970
0
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.
 
E

Eeyore

Jan 1, 1970
0
Lostgallifreyan said:
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
 
E

Eeyore

Jan 1, 1970
0
Lostgallifreyan said:
Eeyore wrote



Wrong. I try to use basic parts where possible. I just happen to consider
an optoFET as a basic part,
£2.50

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
 
L

Lostgallifreyan

Jan 1, 1970
0
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.
 
E

Eeyore

Jan 1, 1970
0
Lostgallifreyan said:
Eeyore wrote


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

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

Graham
 
L

Lostgallifreyan

Jan 1, 1970
0
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 £2.50 per
H11F1 even though I only bought twenty. Several basic op-amps cost more
each.
 
E

Eeyore

Jan 1, 1970
0
Lostgallifreyan said:
Eeyore wrote


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
 
E

Eeyore

Jan 1, 1970
0
Lostgallifreyan said:
I paid a lot less than £2.50 per H11F1 even though I only bought twenty.

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

Graham
 
L

Lostgallifreyan

Jan 1, 1970
0
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.
 
C

catguy

Jan 1, 1970
0
Lostgallifreyan said:
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
 
M

Michael A. Terrell

Jan 1, 1970
0
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 but some can
be seen on 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
 
M

Michael A. Terrell

Jan 1, 1970
0
Lostgallifreyan said:
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
 
L

Lostgallifreyan

Jan 1, 1970
0
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.
 
E

Eeyore

Jan 1, 1970
0
Lostgallifreyan said:
Eeyore wrote

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
 
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?
 

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