« previous next »
Pages: [1]   Go Down

Author Topic: Help id this IC  (Read 6524 times)

0 Members and 1 Guest are viewing this topic.

Offline erolsansoloTopic starter

  • Contributor
  • Posts: 15
Help id this IC
« on: April 14, 2015, 10:04:08 am »
I had a pack full of stuff delivered from a local supplier last week.

Every item checked out OK except for this lot, which I couldnt find out what it was. I looked all over the web, probably im missing something.

The IC in question arrived instead of a short reel of SOIC8 package 7812 regulator.

The marking on it is: 8534 4ct c4n4. it bears the mark of TI.
Logged
 

Offline atferrari

  • Frequent Contributor
  • **
  • Posts: 314
  • Country: ar
Re: Help id this IC
« Reply #1 on: April 14, 2015, 10:56:01 am »
Two things come to mind upfront:

Checking them against your order.

Call the supplier.
Logged
Agustín Tomás
In theory, there is no difference between theory and practice. In practice, however, there is.
 

Offline erolsansoloTopic starter

  • Contributor
  • Posts: 15
Re: Help id this IC
« Reply #2 on: April 14, 2015, 11:17:49 am »
The SOIC8 7812 regulator is missing from the order. This 8534 came in its place. every other item checks out.

I already called my supplier, they were also a little puzzled about the this IC when I told them it was 8534. They couldnt figure it out right away.

They just said, "no problem, we are immediately sending you the SOIC8 7812 chips you ordered. You can keep the unknown ICs."
Logged
 

Offline bktemp

  • Super Contributor
  • ***
  • Posts: 1616
  • Country: de
Re: Help id this IC
« Reply #3 on: April 14, 2015, 11:34:33 am »
TI has a part marking search:
http://focus.ti.com/general/docs/partmarking/partmarkinghome.jsp
But it does not give anything in SO8 for 8534 (or 85344).
Therefore it looks like a custom IC or at least a custom part number.
Logged
 

Offline Cliff Matthews

  • Supporter
  • ****
  • Posts: 1910
  • Country: ca
    • General Repair and Support
Re: Help id this IC
« Reply #4 on: April 14, 2015, 02:46:16 pm »
SMPS have dual-diode schottky rectifiers with "CT" on the markings. The stripe over pins 1 and 8 (cathodes?..) and the "4CT" would lead me to think this could be polarity tested for diodes. If so, the TI logo might be present on some knock-off SOIC's.
Logged
 

Offline zerorisers

  • Regular Contributor
  • *
  • Posts: 132
  • Country: us
  • young noobie, my apologies for low knowledge base.
Re: Help id this IC
« Reply #5 on: April 14, 2015, 02:50:57 pm »
Quote from: Cliff Matthews on April 14, 2015, 02:46:16 pm
SMPS have dual-diode schottky rectifiers with "CT" on the markings. The stripe over pins 1 and 8 (cathodes?..) and the "4CT" would lead me to think this could be polarity tested for diodes. If so, the TI logo might be present on some knock-off SOIC's.
I have dealt with a chip the other day that looked similar with a stripe but it was a transformer driver. I will see if I can get the schematics and number later today. The number on the IC was not the real part number and the real number was shown on the schematic of the board. I can see if I can get in contact with a buddy of mine from TI and see if she knows anything that can help out here.
Logged
 

Offline amyk

  • Super Contributor
  • ***
  • Posts: 8270
Re: Help id this IC
« Reply #6 on: April 14, 2015, 03:13:20 pm »
Is that a datecode? Week 34, 1985?
Logged
 

Offline bitwelder

  • Frequent Contributor
  • **
  • Posts: 967
  • Country: fi
Re: Help id this IC
« Reply #7 on: April 14, 2015, 04:04:01 pm »
Have you checked if there is anything printed on the bottom side of the chip?
Logged
 

Offline Fraser

  • Super Contributor
  • ***
  • Posts: 13168
  • Country: gb
Re: Help id this IC
« Reply #8 on: April 14, 2015, 04:52:12 pm »
Logged
If I have helped you please consider a donation : https://gofund.me/c86b0a2c
 

Offline erolsansoloTopic starter

  • Contributor
  • Posts: 15
Re: Help id this IC
« Reply #9 on: April 14, 2015, 06:45:14 pm »
When i first looked underside of the IC, there was a faint marking that i dismissed as i was obsessing about the front marking.

Now under a microscope light, clearly this image raises more questions i think..
Logged
 

Offline erolsansoloTopic starter

  • Contributor
  • Posts: 15
Re: Help id this IC
« Reply #10 on: April 14, 2015, 06:49:11 pm »
Quote from: Aurora on April 14, 2015, 04:52:12 pm
Not much help but.......

http://www.aliexpress.com/store/product/Eight-feet-TI-8534-SOP8-patch/1299470_32311481502.html

Wow, i didnt even come by on alibaba or aliexpress - good catch, tho as you say not much help :)
Logged
 

Offline erolsansoloTopic starter

  • Contributor
  • Posts: 15
Re: Help id this IC
« Reply #11 on: April 17, 2015, 04:45:34 pm »
update


The replacement reel for the missing 7812 SOICs arrived today, and guess what.. I received the same chip as before - 8534. Appearently it was 7812 all along. probably custom marked or knockoff.
I will build a small test circuit to confirm.

Just a heads up for anyone coming by the same chip.
Logged
 

Offline Falcon69

  • Super Contributor
  • ***
  • Posts: 1482
  • Country: us
Re: Help id this IC
« Reply #12 on: April 17, 2015, 04:47:23 pm »
OR.....

They sent the wrong one AGAIN!
Logged
 

Offline smjcuk

  • Frequent Contributor
  • **
  • Posts: 464
  • Country: gb
Re: Help id this IC
« Reply #13 on: April 17, 2015, 09:34:23 pm »
And this is why I buy stuff from Farnell...
Logged
 

Offline PeterFW

  • Frequent Contributor
  • **
  • Posts: 577
  • Country: de
    • Stuff that goes boom
Re: Help id this IC
« Reply #14 on: April 17, 2015, 09:52:50 pm »
Quote from: smjcuk on April 17, 2015, 09:34:23 pm
And this is why I buy stuff from Farnell...

Yea... because they never fuck up! *facepalm*
Logged
 

Offline smjcuk

  • Frequent Contributor
  • **
  • Posts: 464
  • Country: gb
Re: Help id this IC
« Reply #15 on: April 17, 2015, 10:05:41 pm »
Actually I've never had a single problem with them in 20 years.
Logged
 

Offline Dave

  • Super Contributor
  • ***
  • Posts: 1352
  • Country: si
  • I like to measure things.
Re: Help id this IC
« Reply #16 on: April 18, 2015, 01:46:39 am »
Consider yourself very lucky. They f*ck up my orders all the time and I don't even order that often. :palm:
Logged
<fellbuendel> it's arduino, you're not supposed to know anything about what you're doing
<fellbuendel> if you knew, you wouldn't be using it
 

Offline erolsansoloTopic starter

  • Contributor
  • Posts: 15
Re: Help id this IC
« Reply #17 on: April 18, 2015, 01:01:07 pm »
Quote from: Falcon69 on April 17, 2015, 04:47:23 pm
OR.....

They sent the wrong one AGAIN!

hahahh I hope not!  :)

if the chip blows up in the test circuit, then -  :palm:
Logged
 

Offline bookaboo

  • Frequent Contributor
  • **
  • Posts: 728
  • Country: ie
Re: Help id this IC
« Reply #18 on: April 18, 2015, 01:21:46 pm »
Quote from: smjcuk on April 17, 2015, 10:05:41 pm
Actually I've never had a single problem with them in 20 years.

Quote from: smjcuk on April 17, 2015, 10:05:41 pm
Actually I've never had a single problem with them in 20 years.

I find them as reliable as you could reasonably expect, probably >99% of orders on time and correct.

Reminds me of the time I found a random reel in the bottom of a box from Anglia (UK based components). At the time we didnt even do surface mount and the rest of the order matched the delivery note, so I did the honest thing and shipped it back without even looking what they were.
In our next order we received an extra box with several boxes of very nice biscuits as a thank you, apparently the reel was worth >£7000. I was always known as having "spent" £7000 on biscuits.
Logged
 
Pages: [1]   Go Up
« previous next »

Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf

 


EEVblog Main Site EEVblog on Youtube EEVblog on Twitter EEVblog on Facebook EEVblog on Odysee