74OL6011 Equivalents

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74OL6011 Equivalents

Postby silverspring » Sun Aug 08, 2010 3:04 pm

Hi all,

I'm in the UK and new to class e. Love the site!
Does anyone have a suggestion for a replacment optocoupler? The 74OL6011 doesn't seem to be available anymore.
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Re: 74OL6011 Equivalents

Postby kf1z » Sun Aug 08, 2010 4:24 pm

Last I knew, Farnell had them... but I guess no more.....

You might try to email Steve, WA1QIX.

He had a bunch of them.... I'm sure if he still has good stock he will sell them to you.

There were some other threads.. last year?.... about the same thing...

I believe the fellow who was trying to find them got them from Farnell...


Try Steve...

Maybe he'll pipe in with possible replacements etc...

Bruce
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Re: 74OL6011 Equivalents

Postby kf1z » Sun Aug 08, 2010 4:30 pm

This was from 2 years ago..............
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viewtopic.php?f=3&t=762
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Re: 74OL6011 Equivalents

Postby Todd WD4NGG » Thu Dec 23, 2010 6:48 pm

Hi All,
I wonder if anyone has looked into the new Fairchild FOD0720 and FOD0721 series of Logic To Logic Optocouplers? These look like upgrades to the original 74OL6000 series with higher rated speed of 25mbps, TTL and CMOS compatible. These come in the smaller SOIC 8-pin package and are limited
to 6vdd on the input and output sides, but 6 volts should be enough to drive a FET gate, or they could always be used with a gate driver chip on the output side to drive a gate to 12 volts if needed.

The Logic To Logic optocouplers are so nice to work with as they will take a standard TTL input
with virtually no current to drive the input gate and they have a totem-pole output stage that
doesn't need a pull-up resistor. The 25mbps speed should give even better resolution than the older 74OL6000 series. If someone doesn't mind working with SMT devices they look like a good
upgrade for the 74OL6000. They could be mounted on a SOIC to DIP adapter to make them easier to work with.

The nicest thing of all is they are currently available from Mouser and probably a few other suppliers. Mouser lists about 2000 in stock of each one. Price in single quantity is around $5 each.

I would assume the FOD0720 and FOD0721 packages are an inverting and non-inverting pair but I can't seem to find any information on which is which. Fairchild's own data sheet does not indicate which is which but I assume the FOD0721 is the inverting device? May have to buy one of each to determine which one is the inverting package? There are situations where it would be best to have a choice between an inverting and non-inverting optocoupler.

Being in a SOIC package it may be a while before these may become obsolete like the earlier 74OL6000 generation?

73 - Todd WD4NGG
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Re: 74OL6011 Equivalents

Postby steve_qix » Tue Dec 28, 2010 12:35 pm

There are a lot of optoisolators with DIP (thru-hole) packages also. Digkey lists quite a few. They appear to be all 8 pin DIPs, so not a "drop in" replacement, but nevertheless usable. I didn't look at the details, but I bet these could be used or adapted.
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Re: 74OL6011 Equivalents

Postby Todd WD4NGG » Sun Jan 02, 2011 2:31 pm

Hi Steve, I haven't run across any other near-identical replacements for the Fairchild 74OL6000
series except for the newer FOD0720 and FOD0721. There are lots of optoisolators listed in the Digi-Key catalog but none quite like the Logic-To-Logic optocouplers that Fairchild makes. Mouser is the one who carries the FOD0720 and FOD0721.

Most of the other optoisolators listed have only an LED input stage that requires some kind of high-speed driver or else they need a pull-up resistor on the output side. I guess some people may prefer using a pull-up resistor but I still like having the totem-pole style output. I still like the simplicity of the logic-to-logic optocoupler that Fairchild makes. Happy New Year all.

73 - Todd WD4NGG
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Re: 74OL6011 Equivalents

Postby Diego-CX4DI » Fri Aug 12, 2011 9:35 am

6N137 work very good and has a little cost.

73's
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