Can anyone ID this chip?

[digi2t]

Been combing through some Canadian content lately, namely the Landmine Effects LD-1 distortion pedal, and I'm trying to get my head around the bypass on it. In particular, there's a Philips chip that I can't seem to find any info on...

https://drive.google.com/file/d/15l_zP5hYES7wKlY6bjxvrURdAilBlae2/view?usp=sharing

The numbers are;
74010FC
B2418PL
Hnn0024

I thought it would be some sort of CMOS chip, but I have yet to pin down a datasheet for this sucker. As for the architecture, this is how it fits into the scheme of things...

https://drive.google.com/file/d/1nZPZfoasLsKBxE4xfoXriAb9mIua6h_W/view?usp=sharing

So in a nutshell, it's switching the jfets and LED on and off.

Would this be an equivalent to a CD40106?

[Scruffie]

Can't actually look at the images but 74LS10? Triple NAND.

[digi2t]

Supply max is 7v on the 74LS10. This on is on the 9v rail.

[Mark Hammer]

Can't see what you've linked to, but I can see several moderately hi-res images online.

1) What you have is also a surface mount board?  I'm assuming that the available posted images are not from some later issue than what you have?

2)  What I can see on-line is pretty much 4558 chips.  The feature set and sound do not suggest anything more exotic than that.

3) The footswitch kinda looks like a stompswitch but kinda doesn't.  Is it some sort of sot-touch switch?  If so, perhaps your mystery chip is used for switching.

[digi2t]

Can't see what you've linked to, but I can see several moderately hi-res images online.

1) What you have is also a surface mount board?  I'm assuming that the available posted images are not from some later issue than what you have?

2)  What I can see on-line is pretty much 4558 chips.  The feature set and sound do not suggest anything more exotic than that.

3) The footswitch kinda looks like a stompswitch but kinda doesn't.  Is it some sort of sot-touch switch?  If so, perhaps your mystery chip is used for switching.

1) Yup, all SMD.

2) The audio is all through 4580's.

3) It's a momentary N.O. switch, the actuator is integrated into the lid.

This particular chip is only for the switching.

Pics;

[tonyharker]

From the picture it looks more like 74810

[Mark Hammer]

1) Yup, all SMD.

2) The audio is all through 4580's.

3) It's a momentary N.O. switch, the actuator is integrated into the lid.

This particular chip is only for the switching.

Well that ought to narrow down the field a bit.

[anotherjim]

The supply voltage would be ok if it was a 74C series part, but I thought they were obsolete by the time this was designed? I don't even know if 74C ever came in SMD form.

[Rob Strand]

I was thinking like Jim but there's problems with it.
I can't actually see the pics.

There's a stack of different logic families but they offer similar part numberings.

I'm assuming the trace is correct but there's a couple of bugs like:
- C15 wrong side of R15
- The connection to the base of Q6 seems to be stuffing up whatever C16 is doing and the gates it goes to.

For the circuit work, the device has to be some sort of inverter, so inverter, nand, nor.

You can eliminate certain chips because of outputs to ground.
Pin connecting together can only have one output in the bunch; if there is an output, as they could all be inputs.
From the lines that go to the JFET  gates at least one must be an output.
The pin to the base of Q6 (via a resistor) must be an output.
Floating pins (pin would be an output 9)

number of pins = 14
gnd = 7
vcc = 14

pin
2         input (to vcc)
4         input (to gnd)
9        output (open).  possibly 9 belongs to pin 4 as it's only corresponding input forced.
3 to 11  one is possibly output
5 to 6    one is possibly output
8 to 13  one is possibly output
10     must be input from switch

So far only 4 outputs identified, so it's possible it's a quad device instead of a hex device.

In the 4000 series and the 7400/74LS/74C...  etc series the gates are arranged different.   There's also different arrangement for the same part type (eg 74LS00 vs 74LS01)

The pinout which seems to line-up the best is the 74LS00 pinout.
The floating pin 9 and possibly pin 4 and pin 9 corresponding doesn't match.
Also 5 to 6 can't work for 74xx00.

Perhaps you can check the trace again?  a couple of bugs would put the above down the wrong path.

[digi2t]

Effectively, a couple of small errors on the trace. Here's the update;



Correct on the cap as well. Disregard it's wrong position.

[Rob Strand]

I couldn't make sense of the floating pin 9, the grounded pin 4, and the chip number.

I suspected it was one of the JFET switching circuits using a CMOS gate from other pedals.  After a bit of poking around,



Hmmm, the circuits match up a lot!!!

So maybe a CD4007U (also known as the WT74010FC).

[digi2t]

I couldn't make sense of the floating pin 9, the grounded pin 4, and the chip number.

I suspected it was one of the JFET switching circuits using a CMOS gate from other pedals.  After a bit of poking around,



Hmmm, the circuits match up a lot!!!

So maybe a CD4007U (also known as the WT74010FC).

And the super sleuth award goes to Rob. 



Thanks Rob!

[Rob Strand]

It makes you wonder where you would get a chip with that marking?

The print on your chip looks a bit wonky to me.  Maybe they have been re-marked?

Philips through-hole parts  were  marked HEF4xxx.   Although I can't remember how Philips SMD parts were marked.  I could only find an NXP SMD pic,


You can see it's still HEF4xxx though.


Got a philips one,

[digi2t]

Actually, I probably created more confusion than anything else. I have the LED going to ground in my schemo, when in reality, it's the other way around (to power), with the chip switching the transistor to ground.

Sorry bout that. 

As for the marking on the chip, I find it weird too that only the outline of the Philips symbol is there (no wavy lines in the circle). These boards were assembled by Samsung, so maybe they had some bulk deal going on or something. Maybe Philips, who is now NXP belongs to Samsung? Who knows.

[Rob Strand]

Actually, I probably created more confusion than anything else.

No problem there.  It looked a bit funny but not as funny as the chip.

As for the marking on the chip, I find it weird too that only the outline of the Philips symbol is there (no wavy lines in the circle). These boards were assembled by Samsung, so maybe they had some bulk deal going on or something. Maybe Philips, who is now NXP belongs to Samsung? Who knows.

The simplified Philips logo is supposed be legit.  I suspected that it was during the Philips to NXP transition but I haven't actually read anything saying that. - nope.   It could just be one of the factories.   Samsung and NXP might just work together for manufacturing.

[imJonWain]

Samsung owns more then half a dozen fabs so It's probable.

[Rob Strand]

I suspected that it was during the Philips to NXP transition but I haven't actually read anything saying that. 

Well I can at least say that's not true.

I found some through-hole and SMD IC's with the simple Philips logo.   The dates were 1994 to 2001.  All were from Thailand (Bangkok).    The last line has format  HnnYYWW,   where Hnn are the actual text and the n in the second position means Bangkok,  YY=year, WW = week.  I also found the full logo in this period, and before and after.

Philips didn't change to NXP until late 2006.


Your chip is year 2000 with the Hnn.