Help with Identifying SMD device - Page 1
Forum section: electronics / beginners

author: CaptCrash
author_rank: Regular Contributor
timestamp: November 18, 2015, 12:13:05 pm
content: Hi,Im hoping that someone can assist with identifying the broken component on this board.Its marked X03 but Im not aware if its a resister, capacity or something else.For reference, the board is part of an Aquarium Controller expansion box from GHL. The two RJ45 connectors pictured are listed by the manufacture as for their PAB bus, but the NXP chip that connects to these ports is a CAN bus controller from looking at its datasheet, so I assume thats what it really is.The port on this unit is not working (it got salt water on it) and from what I can see visually, this appears to be the only chip that has let any smoke out.If someone can assist in identifying the circled part, that would be great.Thanks

author: Simon
author_rank: Unknown
timestamp: November 18, 2015, 12:34:51 pm
content: It's a resistor, probably some 10's of K ohm. it's a "x03" = "x0" x10^3 as it's only 3 digits It's probably 5% rage so not many values in that range (10 12, 15, 18, 22, 27, 33, 39, 47, 56, 68, 82, 100 etc) so looks like 10K to me

author: CaptCrash
author_rank: Regular Contributor
timestamp: November 18, 2015, 12:40:11 pm
content: Thanks for the really quick reply I appreciate it.

author: deephaven
author_rank: Frequent Contributor
timestamp: November 18, 2015, 12:41:34 pm
content: Looks like a fuse to me, similar to these:http://uk.farnell.com/littelfuse/0466-125nr/fuse-1206-v-fast-acting-125ma/dp/1596521

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: November 18, 2015, 12:48:54 pm
content: Looking at its placement and the other resistors I have to second it being a fuse. You could try and measure the other one o the second port and if it's a short you have your awnser

author: Simon
author_rank: Unknown
timestamp: November 18, 2015, 12:53:05 pm
content: you may well be able to measure the part itself, it does not look that bad, it looks lore like the solder joint was damaged.

author: CaptCrash
author_rank: Regular Contributor
timestamp: November 18, 2015, 01:46:06 pm
content: Quote from: deephaven on November 18, 2015, 12:41:34 pmThanks, yes that looks right.Quote from: TheUnnamedNewbie on November 18, 2015, 12:48:54 pmThe non damaged one measures as a short (well less than 1 ohm on my cheapy multimeter).Quote from: Simon on November 18, 2015, 12:53:05 pmThe damaged one is blown/open circuit. The top half of the package is split from the bottom.

author: wraper
author_rank: Unknown
timestamp: November 18, 2015, 01:51:58 pm
content: It's a resettable polyfuse.

author: CaptCrash
author_rank: Regular Contributor
timestamp: November 18, 2015, 02:03:09 pm
content: Is there anyway to determine an appropriate replacement value/type?The package is 1206? (approx 3.6mm x 1.5mm).

author: djQUAN
author_rank: Frequent Contributor
timestamp: November 18, 2015, 04:06:51 pm
content: Looks to me it's this one.http://www.te.com/usa-en/product-RF1346-000.htmlHold Current (Room Temperature)?(A) .35Voltage (Max)?(V) 16Trip Current (Room Temperature)?(A) .75Current (Max)?(A) 20Resistance (Min)?(?) .45Resistance (Max) (Post Trip)?(?) 1.35Time to Trip (Max)?(seconds) .1Power Dissipation (Max)?(W) .6Resistance (Max)?(?) 1.35Operating Voltage (Max)?(V) 16compare to the good one if it is the same.

author: CaptCrash
author_rank: Regular Contributor
timestamp: November 19, 2015, 12:58:57 am
content: Quote from: djQUAN on November 18, 2015, 04:06:51 pmThank you for your efforts, I really appreciate it.

author: CaptCrash
author_rank: Regular Contributor
timestamp: November 19, 2015, 08:05:28 am
content: Quote from: djQUAN on November 18, 2015, 04:06:51 pmThat is outstanding. I got confirmation from the vendor on the part number and its a nanoSMDC035F.So its a different component manufacturer but extremely similar specs.You guys are outstanding at being able to figure this out from the small hints I was able to give.