Maker Pro
Maker Pro

Optoisolators: 4N32 vs. NTE3083

J

Jag Man

Jan 1, 1970
0
My electronics store sold me the NTE "equivalent" of the 4N32.
Are these really equivalent?

TIA

Ed
 
C

CFoley1064

Jan 1, 1970
0
Subject: Optoisolators: 4N32 vs. NTE3083
From: "Jag Man" [email protected]
Date: 10/22/2004 10:38 AM Central Daylight Time
Message-id: <[email protected]>

My electronics store sold me the NTE "equivalent" of the 4N32.
Are these really equivalent?

TIA

Ed

Hi, Ed. NTE parts are cross-referenced to standard parts, based on the idea
that a good part will be a substitute for many different part numbers. I would
guess that the NTE3083 parts are "house numbered" 4N32s which have been
post-production tested to cull out the parts that are outliers or are on the
low side as far as current gain or whatever. In order to be sure, though, you
basically just have to look at the data sheets:

http://www.nteinc.com/specs/3000to3099/pdf/nte3083.pdf

http://www.fairchildsemi.com/ds/4N/4N32.pdf

A quick scan shows that the NTE part is the same type of part
(opto-darlington), and should meet or exceed the relevant specs for the 4N32.

Trust the data sheet. It is your friend.

Good luck
Chris
 
J

Jag Man

Jan 1, 1970
0
Thanks, Chris.

As you might guess, this is in relation to the curcuit you posted for me a
week or so ago.
I posted some later questions under that thread, but I guess you missed
them.
Anyway, I guess I'm about ready to start poking things into a project board.
Only hold up is a back order on the NTE3083 (store had only one) and the
4017.

BTW, in your description of the circuit you seemed to imply that the 4N32
is non-Darlington, yet the sheets for both it and the 3083 say Darlington.
Guess it doesn't matter.

Thanks again.

Ed
 
C

CFoley1064

Jan 1, 1970
0
Subject: Re: Optoisolators: 4N32 vs. NTE3083
From: "Jag Man" [email protected]
Date: 10/22/2004 11:47 AM Central Daylight Time
Message-id: <[email protected]>

Thanks, Chris.

As you might guess, this is in relation to the curcuit you posted for me a
week or so ago.
I posted some later questions under that thread, but I guess you missed
them.
Anyway, I guess I'm about ready to start poking things into a project board.
Only hold up is a back order on the NTE3083 (store had only one) and the
4017.

BTW, in your description of the circuit you seemed to imply that the 4N32
is non-Darlington, yet the sheets for both it and the 3083 say Darlington.
Guess it doesn't matter.

Thanks again.

Ed

Hi, Ed. Sorry -- the AOL newsreader facility is crud. It defaults to deleting
posts after reading, which causes you to lose track of threads.

The 4N32 is an optodarlington. It's good for 60 mA continuous, which should be
enough for your application. The only negatives are speed (unless you take
care, you're going to have trouble over a few KHz -- not a problem at
automotive speeds) and that a saturated darlington will have a Vce of about 1V.
That shouldn't matter for this application, either. For a first cut, I guess
it's a good choice for what you're doing.

If you need electronics components and Radio Shack doesn't have them, you might
want to consider Digi-Key or Mouser as well as NTE. They're all good
resources.

Good luck
Chris
 
J

Jag Man

Jan 1, 1970
0
Thanks.

Regarding the current in the LED portion of the optoDarlingtons,
I was thinking of 600 ohms, which should give about 20 ma. Is that
going to work OK?

Also, I'd like to put in a couple LEDs to give some visual feedback. Would
it work
put them between the 2N3904s and GRD?

Ed
 
C

CFoley1064

Jan 1, 1970
0
Subject: Re: Optoisolators: 4N32 vs. NTE3083
From: "Jag Man" [email protected]
Date: 10/22/2004 3:58 PM Central Daylight Time
Message-id: <[email protected]>

Thanks.

Regarding the current in the LED portion of the optoDarlingtons,
I was thinking of 600 ohms, which should give about 20 ma. Is that
going to work OK?

Also, I'd like to put in a couple LEDs to give some visual feedback. Would
it work
put them between the 2N3904s and GRD?

Ed

20 mA is good for the opto LEDs. That's what I try to shoot for.

As far as putting some LEDs in the drive loop, how about just putting them on
the collector side like this (view in fixed font or M$ Notepad):


.----o A
VCC VCC |
| | |
.-. V~~ |/
| | VCC VCC VCC ~~ -~~ -|4N32
| | | | | ___ ~~ | |>
'-' | | | .-|___|-|<-' |
| .--o-o--. .---o-----. | LED '----o B
o--. | 8 4 | | Vdd | ___ |/
| | | | | "1"o-|___|- -|2N3904 VCC .----o C
.-. '--o7 | | | 10K | |> | |
| | | 3o----oCLKEN | .-. | V~~ |/
| | | | | | 10K| | GND ~~ -~~ -|4N32
'-' | 555 | | 4017 | | | ___ ~~ | |>
| .-o6 | .-oCLK | '-' .-|___|-|<-' |
| | | | | | | | | LED '----o D
| o-o2 | | | | ___ GND|/
.-. | | | o-oVss "6"o-|___|- -|2N3904
| |<-o | 1 5 | | | | 10K | |>
| | | '--o--o-' | '---------' .-. |
'-' | | | 10K| | GND
| | | | | |
o---' | | '-'
| GND GND |
--- GND
---
|
GND
created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de


This should do the trick.

Good luck
Chris
 

Similar threads

J
Replies
53
Views
3K
James Arthur
J
W
Replies
7
Views
1K
Frithiof Andreas Jensen
F
T
Replies
2
Views
879
Frithiof Andreas Jensen
F
F
Replies
1
Views
806
James Beck
J
Top