Need info/datasheet for an 8-pin DIP (pic enclosed)

[Audiotexan]

Just ran across this little gem, which is eluding my memory at the moment.

I'm thinking OTA, but could also be a VCA..I just can't recall.



I tried googling IC datasheet "SK9201", "RCA-210", and "RCA 210", but came up empty on all counts.

If someone can help point me in the right direction, or post a link to the datasheet, I'd appreciate it. (Seems my google-fu is weak ATM.)

Regards,
AT

[J M Fahey]

To begin with: where did you get it from?
What was it supposed to do there?
Did you pull it from some piece of equipment?
Brand/model/schematic?

[Audiotexan]

It's from a Pearl CO-4 Compressor. Unfortunately I don't have a schem for it.

[Jazz P Bass]

SK9201 crosses to a (shudder) NTE996.
It's an OTA.
http://www.nteinc.com/specs/900to999/pdf/nte996.pdf

Note: Unless it's a CA3080?
Check the circuit to see what is hooked up where.
http://www.intersil.com/content/dam/...a30/ca3080.pdf

[Audiotexan]

Much appreciated gents!

Incidentally, I'm thinking a CA/LM3080 ought to drop in without issue shouldn't it? (sorry, checking datasheets as I ask this)

/edit: pinouts look the same at least

[Audiotexan]

OK, looks like both are 2ma bias current, 5v diff. input voltage, only difference that I can tell offhand is that the older CA3080 would take a max swing of 36v, as opposed to the NTE handling 2-18v supply volts.

Excellent! Thanks again, and sorry for asking what I could have answered myself on that last one! :x

Very much appreciate the help though!
AT

[J M Fahey]

Quite certain "36V" means end to end while "2 to 18 V" should actually be "+/- 2 to 18 V".

[Audiotexan]

Quite certain "36V" means end to end while "2 to 18 V" should actually be "+/- 2 to 18 V".

*nods* That's what I meant when I said 'max-swing'.

...the older CA3080 would take a max swing of 36v, as opposed to the NTE handling 2-18v supply volts.

Translated: I was thinking -18 to +18 on the CA3080, and the NTE was limited to a max of -9 to +9.
LMK if I'm still misinterpreting/misunderstanding

PS: with that in mind, another shining example of where an NTE wouldn't stand a chance in certain circuits. :x (Yay for datasheets though)

[oc disorder]

Thank these guys and Google....
freestompboxes.org ? View topic - Pearl - CO-04 ( Compressor )

Links to photobucket pics of actual unit down the bottom of the above link

[km6xz]

A little historical prespective: The SK series of RCA semiconductors was intended as generic replacement devices in the 60s-90s, like Motorola HEP and Sylvania ECG and a few others which were smaller or regional brands. Raytheon started the idea of generic hobbyist parts when they marketed lower grade versions of the main types of early germanium transistors at prices hobbyist could afford back when any transistor costs a day's salary or more.
Surely the SK9201 was an Intersil CA3080e part relabeled, probably one that did not fully meet spec. Motorola and Sylvania had their own numbers for it. They were used primarily by TV repair shops which did not have to keep 3,000 transistors and ICs in inventory when a small stock of 50 or so of the most common ECG or HEP generics could be substituted. One thing about them, although convenient, their substitution book was the most useful item in the product line. Just look up the original(in the days long before internet searching) part number and it would be cross references to the closest SK, HEP or ECG depending on the brand which published the cross reference book.
Getting a full spec LM or CA3080 would probably be cheaper if you can find one at all, since they went out of production for a long time. Recently, another company started making them again.
Small Bear Electronics has the re-issues in stock now for $4.95 each IC CA3080AE

[Audiotexan]

Looks like I need to attenuate my 'snark' a bit on NTE, as this particular ic was probably before NTE even acquired them. lol (It was just an off the cuff remark, and I guess a bit out of line. My bad. Still working on that.)

Secondly, I didn't even realize SK had been acquired by NTE. Or have long forgotten since I never use them (unless in cases like this where I have to cross-reference them.) Will have to lookup when the SK/NTE merger took place...

Thank these guys and Google....
freestompboxes.org ? View topic - Pearl - CO-04 ( Compressor )

Much appreciated for sharing those OC!! Looks like it came with the 3080 to start with! lol
I kinda figured that might be the case since alot of the older compressors used those. That's why I lept to that conclusion first (that it was either an OTA or vca) and wasn't optical.

[J M Fahey]

Translated: I was thinking -18 to +18 on the CA3080, and the NTE was limited to a max of -9 to +9.
LMK if I'm still misinterpreting/misunderstanding

Unfortunately you are
There´s no reason for the NTE suggested replacement standing half the voltage of the original part, so you (or the one who you quoted) missed the "+/-" signs.

[Audiotexan]

Looks like I need to attenuate my 'snark' a bit on NTE, as this particular ic was probably before NTE even acquired them. lol (It was just an off the cuff remark, and I guess a bit out of line. My bad. Still working on that.)

Secondly, I didn't even realize SK had been acquired by NTE. Or have long forgotten since I never use them (unless in cases like this where I have to cross-reference them.) Will have to lookup when the SK/NTE merger took place...

Thank these guys and Google....
freestompboxes.org ? View topic - Pearl - CO-04 ( Compressor )

Much appreciated for sharing those OC!! Looks like it came with the 3080 to start with! lol
I kinda figured that might be the case since alot of the older compressors used those. That's why I lept to that conclusion first (that it was either an OTA or vca) and wasn't optical.

[Audiotexan]

Very much appreciate your input on the forums here KM6XZ!! I've seen a LOT of great advice, and insight shared over the years, and hold you in high regard!
So many wonderful folks still here, and sadly a few lost over the years...but C'est La Vie.

One thing about them, although convenient, their substitution book was the most useful item in the product line.

Absolutely agree!!

Just look up the original(in the days long before internet searching) part number and it would be cross references to the closest SK, HEP or ECG depending on the brand which published the cross reference book.

Yeah, I did alot of that years and years ago. Still have several of the old NTE/SK/ECG croos-books buried somewhere around in storage, since the internet's made things so convenient in that regard.

Getting a full spec LM or CA3080 would probably be cheaper if you can find one at all, since they went out of production for a long time. Recently, another company started making them again.
Small Bear Electronics has the re-issues in stock now for $4.95 each IC CA3080AE

*VERY* nice to know!! TY for sharing that!

I know some old circuits are starting to be 'reborn' again finally, and at least one of them is limited to surface mount only (last I knew) and if memory serves it's the BBD in the Carbon Copy. Hopefully they'll expand those to the 'traditional size' DIP versions (name format escapes me at the moment.)

[Audiotexan]

Unfortunately you are
There´s no reason for the NTE suggested replacement standing half the voltage of the original part, so you (or the one who you quoted) missed the "+/-" signs.

Well help me pull my head out of the sand then brother!! lol

What am I all fogged up about? I'm obviously forgetting a 'basic' here somewhere. *sigh* :/

I was judging that a swing 'through zero' (meaning pos. Vs rail to neg. Vs rail, with 'ground as zero') would be safe since the "DC Input Voltage" says +Vs to -Vs

As opposed to saying it saying "+Vs OR -Vs".

So the other option I'm thinking is you're saying it should be all "-18Vdc" or "+18Vdc" and the same for the 36v specced max, with no swing 'through zero'.

FWIW: I'm using the SK9201 pdf that JPB kindly linked, with a PDF that I had on file for the Intersil (ca3080 ota (Intersil) 1988 Sept). Pic of the two side by side to follow: