Aliexpress jump wire - Page 1
Forum section: electronics / general

author: PartialDischarge
author_rank: Super Contributor
timestamp: January 23, 2025, 09:23:34 am
content: Bought a couple of Ali jump wire mainly because it is advertised as very thin but its not true and the main problem is that is does not solder easily either:Mechanic FXV009:-advertised as 9um, real diameter 30um-does not make electrical contact with DMM probes-hard to solder, takes a few seconds, after which it makes electrical contact at the solder jointsSunshine SS-007E:-advertised as 7um, real diameter 25um-does not make electrical contact with DMM probes-hard to solder, takes a few seconds, after which it makes electrical contact at the solder jointsThese wires are probably 100% Aluminum with no silver in them

author: jpanhalt
author_rank: Super Contributor
timestamp: January 23, 2025, 10:46:05 am
content: How did you measure the diameter?

author: PartialDischarge
author_rank: Super Contributor
timestamp: January 23, 2025, 10:48:47 am
content: Digital micrometer. Also I was suspicious about the diameter because I have 15um real bonding wire for ICs and it is very difficult to see and to work with. And these wires are clearly thicker

author: jpanhalt
author_rank: Super Contributor
timestamp: January 23, 2025, 11:39:57 am
content: Since you have 15 micron wire for comparison, I would look at both under a microscope. Your visual comparison, though, makes it more convincing.

author: 2N3055
author_rank: Super Contributor
timestamp: January 23, 2025, 11:52:27 am
content: Probably confusion as to diameter of the wire (metal) and complete with insulation....

author: PartialDischarge
author_rank: Super Contributor
timestamp: January 23, 2025, 11:56:07 am
content: Quote from: 2N3055 on January 23, 2025, 11:52:27 amAbsolutely not.

author: 2N3055
author_rank: Super Contributor
timestamp: January 23, 2025, 12:01:22 pm
content: Quote from: PartialDischarge on January 23, 2025, 11:56:07 amAbsolutely not what?Are you saying you are absolutely sure you are not confused, or that manufacturer did not label it for metal diameter and provided thick insulation?I see obvious typo on that label, so not much attention to factual details on their part...

author: PartialDischarge
author_rank: Super Contributor
timestamp: January 23, 2025, 12:20:07 pm
content: Quote from: 2N3055 on January 23, 2025, 12:01:22 pmThe measured diameter by me is correct and there is no plastic or varnish insulation in the cable. Also I tested the current carrying capability of a few cms of it and it is higher that what I get with a real 15um Heraeus bonding wire. I highly suspect it is not making direct electrical contact because it is an Aluminum cable and the shininess in it points in that direction. Thus it probably has 0% silver in it making it the second lie in this products. I could test it chemically but I don't have the time.I posted this information as there is no other information on the web about them

author: jpanhalt
author_rank: Super Contributor
timestamp: January 23, 2025, 02:05:47 pm
content: If you have some HCl (muriatic acid), silver is quite resistant to dissolution while aluminum isn't.

author: macboy
author_rank: Super Contributor
timestamp: January 23, 2025, 06:50:38 pm
content: When purchasing from "Ali" as you did, keep in mind that "silver", "gold" etc. should be assumed to be adjectives, not nouns. They refer to the color of the product, not what it is made of. So one should assume that "Silver wire" is just wire that is silver in appearance.I fully trust you that it is thicker than advertised, since the production cost is probably higher for thinner wire that must be very carefully drawn out more times to make it super thin. The material cost is practically nothing in either case. This is the exact opposite of thick wire, where you would be more likely to get something thinner than promised due to high material cost.The second and third issues:Quote...is entirely consistent with wire that is insulated with some type of varnish. This is normal and expected for board "bodge" wire so that it doesn't short out anything between connections, and you can cross several wires without issue. The varnish is designed to be soldered-through (not mechanically removed), and is very thin and practically invisible. With correct iron temperature and a decent flux, it is usually easy enough. If the varnish isn't exposed to fresh hot flux as it is heated, you might have a hard time. This varnish would not likely explain the high diameter, as it is very thin.

author: thm_w
author_rank: Super Contributor
timestamp: January 23, 2025, 10:38:50 pm
content: Out of curiosity, what were you going to use 7 and 9um wire for? Did you want uninsulated specifically?What seller did you buy from?In the listing it looks like they offer 9, 10, and 20um. Not sure what the point of having 9 and 10 is.. must be something else different. Lots of purchases but few reviews.In the photos 20um is copper colored.https://www.aliexpress.com/item/1005008144700954.html

author: wraper
author_rank: Unknown
timestamp: January 23, 2025, 10:45:17 pm
content: QuoteQuoteThese two statements do not add up. Also those wires are supposed to be insulated.QuoteBecause they are insulated. They are supposed to run over the PCB and not short something.

author: thm_w
author_rank: Super Contributor
timestamp: January 23, 2025, 11:00:58 pm
content: Quote from: wraper on January 23, 2025, 10:45:17 pmThe really thin stuff is not supposed to be insulated. Its to repair short sections of broken tracks, so its easier if there is no insulation.I'm sure they make both types though.https://www.aliexpress.com/item/1005003008223364.html"Ease of Use:No need to scrape paint; the wire can be directly welded for a hassle-free soldering experience."https://www.aliexpress.com/i/4000405850908.htmlhttps://ae-pic-a1.aliexpress-media.com/kf/Abd8d35f502844f688184f3268d573f59x.jpeg_.webp

author: wraper
author_rank: Unknown
timestamp: January 23, 2025, 11:08:22 pm
content: Quote from: thm_w on January 23, 2025, 11:00:58 pm"No need to scrape paint; the wire can be directly welded for a hassle-free soldering experience" does not mean it's not insulated.EDIT: also scraping insulation from a wire this thin is nearly impossible, it will simply break.

author: thm_w
author_rank: Super Contributor
timestamp: January 23, 2025, 11:39:53 pm
content: Quote from: wraper on January 23, 2025, 11:08:22 pmTrue, could have some kind of very thin low temp insulation.They definitely make uninsulated copper and silver bond wire in these diameters, though I'm not sure of the cost.edit: here is one that specifically says "no insulation" or "insulation", though we still don't know what OPs should behttps://www.aliexpress.com/item/1005006607774111.html

author: thm_w
author_rank: Super Contributor
timestamp: September 16, 2025, 12:43:34 am
content: I bought a few from phonefix:https://www.diyfixtool.com/products/ycs-silver-copper-jumper-wire-phone-pcb-soldering-repair-tool?_pos=1&_sid=4e7d16ea2&_ss=r&variant=46746575601893(doesn't say but I think both are non-insulated)https://www.diyfixtool.com/products/phonefix-insulation-jump-wire-120m-for-phone-pcb-soldering-tool?_pos=1&_sid=c29d72a19&_ss=r&variant=44576644530405(insulated)https://www.diyfixtool.com/products/phonefix-copper-jump-wire-for-iphone-motherboard-fingerprint?_pos=1&_sid=410705856&_ss=r&variant=44576620282085(insulated or non insulated)I would only call the 0.04mm one as accurate (0.036mm), the other two aren't really near their specified diameter (0.035mm instead of 0.02mm).

author: u666sa
author_rank: Frequent Contributor
timestamp: September 18, 2025, 02:08:48 pm
content: Quote from: PartialDischarge on January 23, 2025, 09:23:34 amI'm using that stuff. Can't say anything about thinness, did not measure it. Only that it's excellent for restoring torn BGA pads. So it's thin enough. As far as it not making electrical contact with DMM probes, that's because it has a thin layer of insulation, which you have to burn off using solder. This is also why it takes a moment for it to get soldered.Keep on tinckering.