Identify this electronic component by unknown manufacturer's logo

45 13

#1 21660203 02 Dec 2011 21:20

Tom Blough Tom Blough

Anonymous
Post #1
21660203 02 Dec 2011 21:20

Hi,
I'm trying to identify this component but I've never seen this manufacturer's logo before. Does anyone recognize it?
Thanks,
Tom

Attachments:

forums-cimg4878-1322788823.jpg Download (29.72 KB)
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#2 21660204 02 Dec 2011 22:50

Joe Wolin Joe Wolin

Anonymous

Post #2
21660204 02 Dec 2011 22:50

Tom,

I'm quite certain this component is a diode, with the line marking being the cathode of the device.

I have no idea who makes this, but here's a pretty comprehensive list of diode manufactures - maybe you can get a clue if you really need to find an exact match.

http://www.interfacebus.com/diode.html

Otherwise, you can probably use an IV tracer to determine the characteristics of this device and find a close replacement.

Hope this helps you out some.

Also, for other's who might have a clue, attached is the same image Tom included with some color adjustment to better see the markings.
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#3 21660205 02 Dec 2011 22:55

Pieter Kruger Pieter Kruger

Anonymous

Post #3
21660205 02 Dec 2011 22:55

Hi Tom

Do you really need the component from that specific manufacturer? I have never seen that logo, but the part looks like a TVS. 948 for manufacturing year and week and LE the SMD code/part number.
#4 21660206 02 Dec 2011 23:02

Tom Blough Tom Blough

Anonymous

Post #4
21660206 02 Dec 2011 23:02

Pieter,

I thought it might be a TVS, so I did a part search on Digikey and turned up eight manufacturers that use the same two part codes I've found, LE and LP, for the same unidirectional TVS devices which corroborates the cathode marking. The LE part is a 12V breakdown device and the LP is a 16V breakdown device.

The attached schematic is the circuit with the unknown part. The three white LED's should have a total Vf of around 9.6V. I don't have access to the circuit the lamp module plugs into, but measuring Vcc without the module gives 16VDC and with the module installed 9.4-9.6VDC - exactly what I would expect from a constant current driver.

I know enough about digital electronics to get myself into trouble and even less about analog, but if a TVS makes sense in the circuit below, then I'm pretty sure we've narrowed it down.

Thanks,

Tom
#5 21660207 03 Dec 2011 01:57

Pieter Kruger Pieter Kruger

Anonymous

Post #5
21660207 03 Dec 2011 01:57

Tom

We're all learning, it's when we think we know it all that we're in trouble...

Without more detail, it does look right in your attached circuit. I am concerned that the TVS will be destroyed if any of the LEDs go open circuit, but this would depend on what is connected to it on the other side. It would be interesting to see what other replies you get as well.

Best of luck.
Pieter.
#6 21660208 09 Dec 2011 12:38

Steve Lawson Steve Lawson

Anonymous

Post #6
21660208 09 Dec 2011 12:38

Perhaps it's Hyundai. It's not quite the same as the logo I found (see attached), but it's similar enough for me to wonder if one is a more stylized version of the other (I've seen that happen).
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#7 21660209 09 Dec 2011 12:47

Steve Lawson Steve Lawson

Anonymous

Post #7
21660209 09 Dec 2011 12:47

The line is not always the Cathode. I was working for a consulting firm, once a long time ago, and at a customer site we were shown a PC board with a number of little components in a row and asked the question "What the heck are these?" They were the size and shape of 1 amp, through hole, rectifiers (this was before the days of "surface mount") and I believe they were red with a black band. The customer assumed what anyone would assume, that the stripe was the cathode. I posed the absurd postulate that perhaps it wasn't. A multimeter test proved me right (they had neglected to try reversing their probes).
#8 21660210 13 Sep 2013 08:35

Teresa Mueller Teresa Mueller

Anonymous

Post #8
21660210 13 Sep 2013 08:35

I know this is a couple years later now, but I was just looking for the same logo, and saw this post during my search.
From what I've deduced, I'm pretty sure that logo is from Diodes Inc
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#9 21660211 14 Sep 2013 10:04

Todd Hayden Todd Hayden

Anonymous

Post #9
21660211 14 Sep 2013 10:04

Possibly Unitrode?
#10 21660212 04 Feb 2015 01:20

Nauman Chughtai Nauman Chughtai

Anonymous

Post #10
21660212 04 Feb 2015 01:20

I know its 2015 now but has anybody been able to figure out who the manufacturer is? I have a similar looking diode marked 152 and 1x from the same manufacturer. i checked with Diodes inc - they said it wasn't one of theirs.
#11 21660213 04 Feb 2015 12:05

Steve Lawson Steve Lawson

Anonymous

Post #11
21660213 04 Feb 2015 12:05

Have you tried searching this thing:

*http://www.datasheetarchive.com/integrated-circuit-logos/*
#12 21660214 04 Feb 2015 17:47

Todd Hayden Todd Hayden

Anonymous

Post #12
21660214 04 Feb 2015 17:47

According to this datasheet, it is definitely their logo. If they claim not to know what it is, perhaps it is really old or counterfeit.

http://datasheet.octopart.com/B540C-13-F-Diodes-Inc.-datasheet-10028006.pdf
#13 21660215 04 Feb 2015 23:39

Nauman Chughtai Nauman Chughtai

Anonymous

Post #13
21660215 04 Feb 2015 23:39

Thanks a lot Todd and for your reply Steve. Will write again to Diodes inc with the link and ask them to take a look at older records.
#14 21660216 26 Feb 2015 16:38

Todd Hayden Todd Hayden

Anonymous

Post #14
21660216 26 Feb 2015 16:38

I used this today to find MATSUSHITA PANASONIC on a pressure sensor from my washer. Thanks for posting that link!
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Topic summary

The discussion centers on identifying an electronic component marked with an unfamiliar manufacturer's logo, suspected to be a diode or a transient voltage suppressor (TVS) diode based on its cathode line marking and circuit context. The component's markings include codes such as "LE" and "LP," which correspond to unidirectional TVS devices with breakdown voltages of approximately 12V and 16V, respectively. The circuit involves three white LEDs with a combined forward voltage near 9.6V, powered by a 16V DC supply regulated by a constant current driver, supporting the TVS hypothesis. Various contributors suggest using IV tracing to characterize the device and reference comprehensive diode manufacturer lists and logo archives for identification. Some speculate the logo might belong to Diodes Inc., though this remains unconfirmed, with suggestions of possible counterfeit or obsolete markings. Other brands like Hyundai and Unitrode are mentioned as potential matches. The discussion also highlights the importance of verifying polarity markings, as the cathode line is not always definitive. Resources such as datasheet archives and logo databases are recommended for further investigation.
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Identify this electronic component by unknown manufacturer's logo

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