Diode replacement - Page 1
Forum section: electronics / repair

author: mvautodiag
author_rank: Newbie
timestamp: May 30, 2024, 01:27:09 pm
content: Hi guys!new here, but been following EEVblog for a while now.I have a Volvo computer to repair (from an excavator or similar) but I can't find info on the burned component.It looked like a diode obviously... might be a zener? but without info, it is hard to order a replacement component. it is about 6.5mm overall length and 3.5mm width.diode test (multimeter) gives me about .570V forward and 3.20V backward on a good one.any help here to identify/test/find a replacement is more than welcome.I added a picture of one of the good one.thanks!!!

author: rfengg
author_rank: Regular Contributor
timestamp: May 30, 2024, 06:23:53 pm
content: Welcome to the forum......Could it be a Onsemi MURS1504?https://www.hotenda.com/marking-code/search/list/RGG.htmlData sheet attached.

author: fzabkar
author_rank: Super Contributor
timestamp: May 30, 2024, 07:47:38 pm
content: Quote from: mvautodiag on May 30, 2024, 01:27:09 pmAre you measuring this diode in-circuit?

author: mvautodiag
author_rank: Newbie
timestamp: May 31, 2024, 06:28:51 am
content: yes in circuit.

author: mvautodiag
author_rank: Newbie
timestamp: May 31, 2024, 10:01:57 pm
content: Quote from: rfengg on May 30, 2024, 06:23:53 pmI have order 10 of each MRS1504T3 and NRVS1504T3G. will compare in circuit once received for similar reading compare to the other one.I guess comparing using my curve tracer will give me a better idea than just using a multimeter.will let you know probably next week.thanks!!

author: mvautodiag
author_rank: Newbie
timestamp: June 04, 2024, 12:09:28 pm
content: I decided to install the NRVS1504T3G in place. tested the same with multimeter and curve tracer. I guess it is a good sign! turned out it burned the pads so I had to find where it went and fix the trace. should be good to go. will let you guys know when it has been tested.thanks again for your help!!!

author: wraper
author_rank: Unknown
timestamp: June 04, 2024, 12:49:41 pm
content: Quote from: mvautodiag on May 31, 2024, 10:01:57 pmWhat for? They're the same thing. It's not that uncommon manufacturer having multiple part numbers for exactly the same part. For example one JEDEC and one with internal naming scheme. Or simply old and new naming schemes, which would not be surprising considering history of on semi.

author: mvautodiag
author_rank: Newbie
timestamp: June 04, 2024, 01:07:38 pm
content: Quote from: wraper on June 04, 2024, 12:49:41 pmone was rated 1.5A, the other one was rated 3A. hence the order of both type. I ended up taking the one rated for 3A.just what I saw on mouser data info.

author: wraper
author_rank: Unknown
timestamp: June 04, 2024, 02:25:12 pm
content: Quote from: mvautodiag on June 04, 2024, 01:07:38 pmThey're both rated the same 1.5A average, 3A peak repetitive and have the same datasheet and marking.https://www.onsemi.com/pdf/datasheet/mrs1504t3-d.pdfIt's one part with two ordering numbers.

author: wraper
author_rank: Unknown
timestamp: June 04, 2024, 03:09:36 pm
content: BTW never trust component description from distributor, always check a datasheet. They're full of inaccuracies and often present different parameters as the same thing as it seems in your case. The most common is mixing together typical and max specs.

author: mvautodiag
author_rank: Newbie
timestamp: June 04, 2024, 03:14:41 pm
content: thanks for the info!make sense when I read datasheet. it would have been 2 different set of parameter if different.will throw them in the same bag. (and will rely less on distributor for such info next time)