What is this burnt USB related chip? - Page 1
Forum section: electronics / repair

author: ZaiGuy
author_rank: Newbie
timestamp: February 22, 2024, 04:20:00 am
content: So I have a Xbox One kinect. . .PLEASE SEE ATTACHED PICSShort story: I blew up a chip.Long story: I tried to solder a lead to the +12V rail, while the unit was still on, with my grounded Weller, and it fried a small chip near the USB socket which rendered the entire thing useless.My question is this: What is the chip?!?I have attached a wide shot of the surrounding area around the chip and a close up on the actual chip itself. In the wide shot the chip is right in front of the usb socket.Any help would be appreciated.Also please let me know if you need more info or if I have left something out that would be helpful.Thanks.

author: ataradov
author_rank: Super Contributor
timestamp: February 22, 2024, 04:37:56 am
content: This is a USB3 mux/switch, for sure, No idea about specific part number. It would actually be interesting to find out, since a lot of more "standard" ICs for this have a lot more pins.

author: ataradov
author_rank: Super Contributor
timestamp: February 22, 2024, 04:43:52 am
content: You need to get a better picture of the traces going to the IC. HD3SS3212 has similar package style, but it is hard to tell if pinout matches. Although from what I can see on the first picture, it does not match.Pin layout of this IC seems to be illogical for the application.

author: ZaiGuy
author_rank: Newbie
timestamp: February 22, 2024, 05:01:32 am
content: I have uploaded more pics, let me know if more would be better. It might be good to mention that there is a added pin in the USB port, this pin is a +12V power rail and it is what I soldered the lead too.

author: ataradov
author_rank: Super Contributor
timestamp: February 22, 2024, 05:03:59 am
content: I'm a bit confused by this package. How many pins does it have on the short sides? And I don't see any solder joints on the part that is closer to the connector.The package I expect is VQFN-20, but so far the traces make no sense for that.

author: ataradov
author_rank: Super Contributor
timestamp: February 22, 2024, 05:05:38 am
content: Actually, looking closer at the new pics, it is not a mux, but some sort of protection/signal conditioning device. In that case layout makes a bit more sense. It just passes all 3 diff pars through without doing any switching. The left two pairs are USB3 signals, and the right one going to the choke is USB2.It might help to remove it to see the exact pin layout. It looks like something custom. But also, simply removing it might fix your issue. If the traces simply go though under the IC, then it is likely that IC is shorting something and removing it will remove shorts.This IC did its job and protected the rest of the components (hopefully).And actually my initial though about the mux was completely wrong. Assuming that this is a USB3 B connector, it is not reversible, so there is no need for a mux at all.

author: ZaiGuy
author_rank: Newbie
timestamp: February 22, 2024, 05:12:44 am
content: MORE pics!!!!!!!Again, thanks.

author: ZaiGuy
author_rank: Newbie
timestamp: February 22, 2024, 05:13:47 am
content: That's interesting, I'll try that.

author: ataradov
author_rank: Super Contributor
timestamp: February 22, 2024, 05:14:41 am
content: Yeah, I already figured it would be a funky pin layout like this.Just remove this IC and it will work, assuming nothing else downstream died.

author: fzabkar
author_rank: Super Contributor
timestamp: February 22, 2024, 05:34:28 am
content: Could it be something like this?https://au.mouser.com/datasheet/2/308/1/ESD8006_D-2311555.pdf

author: ataradov
author_rank: Super Contributor
timestamp: February 22, 2024, 05:37:53 am
content: Yes, absolutely. The layout matches, so even if this is not exactly the same device, it will work.

author: ZaiGuy
author_rank: Newbie
timestamp: February 22, 2024, 05:49:01 am
content: First of all, Thanks. Super helpful.However, I pulled the chip and plugged it in and still nothing. It almost seems like I heard something else pop but I'm not sure because I have music playing.Anyway I think the poor thing is dead. Maybe I will just buy one off ebay as they are like $30.I looked at the link you gave me, neat little device. Though if I Burnt a hole in it wouldn't that mean that the voltage it was subjected to was well over what is could handle, thus I fried who knows what else down the line.Thanks.If you are still wondering, I added a couple pics of the pinout.

author: ataradov
author_rank: Super Contributor
timestamp: February 22, 2024, 05:53:43 am
content: It sort of depends on what exactly happened. Obviously, it is hard to predict what protection device would do if it is exploded like this. Even under normal operating conditions there is a limit to what those devices can do. With a hole like this, I'd say the chance of downstream damage is very high, so I would not spend too much time on that.The goal of this device is to clamp that high voltage. But it can only do it for so long. Ideally it will last long enough for ESD event to pass or over-current protection to trigger on the driving side. But if you overload it enough, it will blow, of course.USB3 pins are quite sensitive, since it is hard to make protection devices with low enough capacitance.

author: Jeroen3
author_rank: Super Contributor
timestamp: February 22, 2024, 07:30:13 am
content: These kind of protection devices handle ESD. They do not handle surges.ESD strikes from handling the cable or plugging it in are microseconds.If this device got the equalization current of an isolated supplie because the connect-ground-first function of the USB port failed, or because you shorted it with your weller, then the trancievers are probably fried as well. That's >50Vac at max 1mA, it won't do that.

author: coromonadalix
author_rank: Super Contributor
timestamp: February 22, 2024, 12:51:50 pm
content: yep seems a protector, but seeing the marks, something powerful happenedsometimes removing it can or could help, but even removed you get nothing, it could have toasted the phy chip internals ??it was in parallel of the lan wires ....

author: T3sl4co1l
author_rank: Super Contributor
timestamp: February 22, 2024, 01:07:35 pm
content: More likely ESD clamp array, yes. Shorting 12V through it, probably blew up the diode(s). Since it failed visibly (blown bondwires?), likely there is damage elsewhere too.Tim

author: gamalot
author_rank: Super Contributor
timestamp: February 22, 2024, 01:31:16 pm
content: To me it looks more like an ESD7016MUTAG.https://int.rsdelivers.com/product/onsemi/esd7016mutag/onsemi-esd7016mutag-uni-directional-tvs-diode-8-u/8829708Phttps://www.onsemi.com/pdf/datasheet/esd7016-d.pdf