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Electronics => Beginners => Topic started by: Agentfoot on November 07, 2024, 10:48:28 pm

Title: SMD part id
Post by: Agentfoot on November 07, 2024, 10:48:28 pm
What exactly is this part? Picture of a broken on then another I found that looks to be the same. Has 3V in the middle above pin1 mark a = on the left and = and o on the right.
Title: Re: SMD part id
Post by: Agentfoot on November 08, 2024, 12:07:41 am
Forgot to add its about 1.5mm by 2mm
Title: Re: SMD part id
Post by: Solder_Junkie on November 08, 2024, 02:49:35 pm
Manufacturers use 2 or 3 character IDs on SMD transistors, Voltage regulators, etc. given the number of possibilities, you really need to refer to the circuit as 2 characters of ID are not sufficient to accurately determine the part, unless you are very lucky.

This database lists over 30 possibilities:
https://smd.yooneed.one/

SJ

Title: Re: SMD part id
Post by: u666sa on November 08, 2024, 04:22:50 pm
[attach=1]
Title: Re: SMD part id
Post by: tooki on November 08, 2024, 04:30:54 pm
Quote from: u666sa on November 08, 2024, 04:22:50 pm
(Attachment Link)
The markings described  in that datasheet do not match the markings on the chip in the photo at all.
Title: Re: SMD part id
Post by: wraper on November 08, 2024, 05:08:59 pm
^pin count does not match either.
Title: Re: SMD part id
Post by: tooki on November 08, 2024, 06:07:29 pm
I truly don’t understand why someone would bother to reply with an answer that is so clearly and obviously wrong. It’s not as though it’s some subtle difference.
Title: Re: SMD part id
Post by: Agentfoot on November 08, 2024, 06:31:08 pm
Then the new twist. I just realized my cheap microscope mirrored the picture. So the chip actually reads "VE".

I know it had something to do button presses, since I have some buttons that no longer work.

I suppose I could take some measurements on the good one to help try and id it.
Title: Re: SMD part id
Post by: wraper on November 08, 2024, 06:39:23 pm
74LVC1G08
https://www.lcsc.com/product-detail/Logic-Gates_Nexperia-74LVC1G08GW-125_C12512.html (https://www.lcsc.com/product-detail/Logic-Gates_Nexperia-74LVC1G08GW-125_C12512.html)
Title: Re: SMD part id
Post by: Agentfoot on November 08, 2024, 06:50:48 pm
That sure looks to be it. Im not sure if the markings on the left and right mean anything because they are different. I took some voltage measurements included on my drawing.
Title: Re: SMD part id
Post by: wraper on November 08, 2024, 06:55:40 pm
Note that IC comes in several different packages that may look the same on the picture but dimensions are different.
Title: Re: SMD part id
Post by: Agentfoot on November 08, 2024, 07:10:42 pm
Ok thanks. It's going to take a miracle to actually get the part mounted. I don't work with stuff this small normally. But it's already broke so mind as well try.
Title: Re: SMD part id
Post by: tooki on November 08, 2024, 08:42:50 pm
Those are easy to solder as long as you have a decent flux and a good pair of tweezers!

Edit: and good light. Trying to solder little fiddly shit in bad light is horrible.