Video card EVGA GT 640 the component marked is exactly SOT-363 ? - Page 1
Forum section: electronics / beginners

author: aug
author_rank: Newbie
timestamp: March 12, 2023, 11:04:35 pm
content: Hello. All good with you ? Thanks for reading my topic.I have novice eletronic knowledge.I have an damaged video card model EVGA GT 640.That video card was analyzed only one component is damaged. Not damages in vcore area.That component is melted being hard to identify. Have 6 pins ( 3 in each side ).In image the component is between red lines.That component is the SOT-363 , SOT-363-3 or SOT-363-6 ? both are similar ?I see another detail about SOT being polarity ... that SOT is NPN , N-channel or P-channel ?SOT-363 , SOT-363-3 or SOT-363-6 are only NPN ?Thanks for reading.Have an nice week.

author: Terry Bites
author_rank: Super Contributor
timestamp: March 13, 2023, 05:20:44 pm
content: Got a schematic?Reverse engineer the circuit adjacent to the thing.

author: wraper
author_rank: Unknown
timestamp: March 13, 2023, 05:28:50 pm
content: By damaged do you mean it's mechanically knocked off or what? Without marking nobody will be tell you what it is. Also this graphics card is barely worth anything.

author: ebastler
author_rank: Super Contributor
timestamp: March 13, 2023, 08:07:56 pm
content: Quote from: aug on March 12, 2023, 11:04:35 pmPlease note that SOT-363 and its variants only denote the mechanicalpackage typeof the part. Without further information -- a circuit diagram or a close-up photo of the same video card with the part still in place -- it is impossible to say what part this is. Since it has 6 pins, it is unlikely that it is a simple transistor (of whichever type).If you have more information, please post it here.

author: aug
author_rank: Newbie
timestamp: March 23, 2023, 11:58:00 pm
content: I have used an cell phone camera to read that component and was possible read the naming.That component have the naming K6N27 and have 6 pins.However I not see any component to buy using internet search using the naming K6N27.Thanks very much for any help.

author: wraper
author_rank: Unknown
timestamp: March 24, 2023, 12:17:01 am
content: likely MMDT3904

author: aug
author_rank: Newbie
timestamp: March 24, 2023, 12:36:23 am
content: @wraperHello. All good with you ?Thanks very much fo replying.I am novice in eletronics.That MMDT3904 is an SOT-363 , SOT-363-3 ou SOT-363-6 ?That MMDT3904 is an NPN , N-channel or P-channel ?In moment I not understand the terms between SOT.The component had melted and was much luck the naming not was erased. =)

author: wraper
author_rank: Unknown
timestamp: March 24, 2023, 01:41:48 am
content: Particular manufacturer makes another upside down row of exactly the same marking but other only single row but component code is the same. Look on the last page.

author: aug
author_rank: Newbie
timestamp: March 24, 2023, 02:20:49 am
content: Thanks very much for your actions sharing the pdf file."Particular manufacturer makes another upside down row of exactly the same marking but other only single row but component code is the same. Look on the last page"In last page show K6N YMThat means K6N27 meansK6N = the component model ( example MMDT3904-7-F ? )27 = manufacturing date ?How I had spoken my level in eletronics is novice.Is a little confused for me ...MMDT3904 and MMDT3904-7-F are exactly the same component ? if yes why different names ?SOT-363 and SOT-363-6 are exactly the same case name ?In pdf show details about voltage amplificationRating 94 VCollector-Emitter Voltage 40 VoltsHowever that component is for an PC video card and voltage is from mainboard not being above of 12 volts.The values about rating and collector are exactly the maximum voltage allowed and operate in low voltage too ?Please I not want to do several replies. I only need few informations to understand exactly that is the correct component and not will damage the video card.

author: aug
author_rank: Newbie
timestamp: April 02, 2023, 06:16:37 am
content: Really the component is the MMDT3904.Removed the damaged component and replaced with MMDT3904.Now Video card power on.Need tests power on for long time and 100 % for confirm if is having correct voltage and amperage in vcore.Thanks very much for all users replying in my topic.Have an nice week.