IC pinout help - dot AND indent, opposite ends!?

[nocentelli]

I've got a handful of CA4069UBE that have a dot at the centre of the right-hand end (with the writing the correct way up and going left to right), but they also have an indent at the centre of the left hand end. If the dot was offset, I would assume that indicated pin 1, but the indent has me stumped. Searched for a likely looking data sheet, but to no avail. Any suggestions?

[R.G.]

Picture?

[R O Tiree]

CD4069? I can't find a CA4069 datasheet.

As to orientation, I seem to remember reading somewhere, years ago, that the indent is the "master" indication for DIP packages.

[Pojo]

I have some TDA1022's with the same thing, indent at one side and a dot at center of other side. For them, pin 1 is at the indent side and ignore the dot. I would think the same in your case.

[CodeMonk]

Ident is the default pin 1 end.

[R.G.]

Picture?

[armdnrdy]

I have a feeling the OP means CD4069

[nocentelli]

Thank you very much, everyone.

Picture?

Picture?

Sorry, I should have said in my original post that I tried a dozen times to capture a suitable picture with my phone camera, but could not pick out sufficient detail.

I have a feeling the OP means CD4069

That's the chap! The writing is partly worn off, and I had misread CD as CA (which i have seen before as a prefix).

I successfully built a working MXR envelope filter using the indent as a guide last night: I have read elsewhere online that a dot takes precedence over an indent, but this is clearly erroneous. I have also read online that the writing going left to right indicates the orientation of pin 1 to the bottom left - Is this usually the case? A quick scan through my IC collection shows this to be the case for every IC i own.

[Digital Larry]

Although you appear to have the answer, I'd vote INDENT every time.  As far as I know the centered circle on the other end is probably a side effect of the molding process and not meant to indicate anything.

[R.G.]

That's the chap! The writing is partly worn off, and I had misread CD as CA (which i have seen before as a prefix).

I successfully built a working MXR envelope filter using the indent as a guide last night: I have read elsewhere online that a dot takes precedence over an indent, but this is clearly erroneous. I have also read online that the writing going left to right indicates the orientation of pin 1 to the bottom left - Is this usually the case? A quick scan through my IC collection shows this to be the case for every IC i own.

What is confusing you is that the flat "dot" is actually an artifact of the molding process on the plastic body. It is very, very unusual to have one of these on the top of the package - so very unusual that it raises my suspicions that this is a counterfeit "TI" part, especially since the lettering has worn off. Generally the flat molding indentations are on the bottom of the body, but flat, round indentations like your "dot" are common on the bottoms of many DIPs.

The deeply molded indent on the end is the correct indicator of the pin-1 end.

[MrStab]

the PT2399 has indents pretty much like this - it's so easy to overlook when you've spent all day building the rest of a circuit.

[armdnrdy]

the PT2399 has indents pretty much like this - it's so easy to overlook when you've spent all day building the rest of a circuit.

Or how about when you've been working on a build, finish the off board wiring, plug the unboxed effect into your guitar and amp, turn on the power, press the footswitch with your finger and.........nothing! 

When you give the build a cursory glance....you find that you haven't installed any of the ICs in the sockets! 

Oh by the way, this is just creative writing! This has never actually happened to me! 

[R.G.]

My name is R.G. and I'm a circo-holic.

[Hello, R.G.]

I once constructed a fairly elaborate switching power supply circuit on perfboard in the lab (in about 1977 as I remember). When it was done I started the debugging, and of course, it's easier to get to the circuit nodes on the bottom of the perfboard. I accumulated a mountain of equipment and a rats-nest of leads and probes trying to find out WHY THE BLASTED THING WOULD NOT MAKE ANY OF THE EXPECTED SIGNALS  until late in the day I happened to turn the board over and found - yep, no ICs in the sockets.

ooops...

Never told the boss about that one. 

[Kipper4]

I've been there too. 

[bluebunny]

I've posted gut shots in the Pictures thread like that...   

[duck_arse]

What is confusing you is that the flat "dot" is actually an artifact of the molding process on the plastic body. It is very, very unusual to have one of these on the top of the package - so very unusual that it raises my suspicions that this is a counterfeit "TI" part, especially since the lettering has worn off. Generally the flat molding indentations are on the bottom of the body, but flat, round indentations like your "dot" are common on the bottoms of many DIPs.

I've just had a look in my ic drawers, and I found ic's of both age-types, ancient and modern, as many with top-moulding-indents as without. many have 2 moulding and 1 indicating indents. all manufs, cmos and linear, but not 8 pins.

[cloudscapes]

pin 1 is next to indent, always, in this case.

[armdnrdy]

My name is R.G. and I'm a circo-holic.

[Hello, R.G.]

I once constructed a fairly elaborate switching power supply circuit on perfboard in the lab (in about 1977 as I remember). When it was done I started the debugging, and of course, it's easier to get to the circuit nodes on the bottom of the perfboard. I accumulated a mountain of equipment and a rats-nest of leads and probes trying to find out WHY THE BLASTED THING WOULD NOT MAKE ANY OF THE EXPECTED SIGNALS  until late in the day I happened to turn the board over and found - yep, no ICs in the sockets.

ooops...

Never told the boss about that one. 

The first step to recovery is admitting you made a mistake. 

[MrStab]

gah, i share the no-IC pain. i blame sockets, they kinda look like IC's. after a day of lead oxide inhalation. transistors, too. maybe it's because they're usually lower in number than the rest of the parts, so i overlook them when checking over the circuit and get too ahead of myself to try it out.

[domdec314]

That's the chap! The writing is partly worn off, and I had misread CD as CA (which i have seen before as a prefix).

I successfully built a working MXR envelope filter using the indent as a guide last night: I have read elsewhere online that a dot takes precedence over an indent, but this is clearly erroneous. I have also read online that the writing going left to right indicates the orientation of pin 1 to the bottom left - Is this usually the case? A quick scan through my IC collection shows this to be the case for every IC i own.

What is confusing you is that the flat "dot" is actually an artifact of the molding process on the plastic body. It is very, very unusual to have one of these on the top of the package - so very unusual that it raises my suspicions that this is a counterfeit "TI" part, especially since the lettering has worn off. Generally the flat molding indentations are on the bottom of the body, but flat, round indentations like your "dot" are common on the bottoms of many DIPs.

The deeply molded indent on the end is the correct indicator of the pin-1 end.

The TI TL074 ICs I've gotten from Mouser recently had the molding indentation on top. I highly doubt Mouser sells counterfeits.