Tantalum still a conflict material? - Page 1
Forum section: electronics / general

author: Pack34
author_rank: Frequent Contributor
timestamp: May 21, 2018, 02:49:01 pm
content: I tend to avoid using tantalums whenever possible and opting for ceramics. With a ceramic, there's less chance of assembly issues and tantalum was a conflict material.Is it still considered to be a conflict material? Or has the issues in Africa fizzled over the last decade or two?

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: May 21, 2018, 03:03:57 pm
content: Sadly, yes. Just a couple of weeks ago there was a harrowing news report (BBC, I think) about this.

author: Pack34
author_rank: Frequent Contributor
timestamp: May 21, 2018, 03:29:14 pm
content: Damn.Have a link to it?

author: Yansi
author_rank: Super Contributor
timestamp: May 21, 2018, 04:30:52 pm
content: Under the current MLCC supply shortages, you will be glad you can replace your high capacity ceramics with tantalums.

author: David Hess
author_rank: Super Contributor
timestamp: May 21, 2018, 05:29:58 pm
content: Since tantalum like most or all conflict minerals is fungible, you may be making a distinction without a difference.What about niobium oxide capacitors?My choice to replace tantalum capacitors might be polymer aluminum in some cases.

author: jmelson
author_rank: Super Contributor
timestamp: May 21, 2018, 07:05:30 pm
content: Quote from: David Hess on May 21, 2018, 05:29:58 pmI won't use Tantalum because of the failure rate. They have a problem if boards are burned in or used for a while, then put on the shelf for a year or two, and then fired up with a fairly high-current power supply, a few will short. And, then, they tend to BURN!I have used Niobium Oxide caps with great results, Never seen one fail unless installed backwards or over-volted.I'm starting to use aluminum polymer caps, and they seem to do quite well. They are definitely less expensive than the larger Niobium Oxide caps.Jon

author: David Hess
author_rank: Super Contributor
timestamp: May 21, 2018, 08:10:44 pm
content: Quote from: jmelson on May 21, 2018, 07:05:30 pmIf you voltage derate them properly and stay within the limits of their surge current rating, then they are very reliable.Polymer tantalum capacitors use a different self healing mechanism so do not suffer from the same failures and limitations.

author: Cyberdragon
author_rank: Super Contributor
timestamp: May 22, 2018, 01:27:02 am
content: Quote from: jmelson on May 21, 2018, 07:05:30 pmBut SMD ceramics can crack, short and go sizzle!

author: Mr. Scram
author_rank: Super Contributor
timestamp: May 22, 2018, 02:46:00 am
content: Quote from: Cyberdragon on May 22, 2018, 01:27:02 amProper board design and maybe crack or short resistant ceramics should mitigate that.

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: May 22, 2018, 03:09:28 am
content: Quote from: Pack34 on May 21, 2018, 03:29:14 pmSorry for the delay.https://youtu.be/4wdWuEH18UQThe report was on CNN and focused on cobalt but it shows the ongoing situation in Democratic Republic of Congo (the worst offender) and still applies to the 3TG minerals (tin, tungsten, tantalum and gold). The emphasis on cobalt is because there is a push to add the chain of custody requirements to cobalt that apply to the other conflict materials. If anything, the situation has gotten worse.(edited for layout)

author: David Chamberlain
author_rank: Frequent Contributor
timestamp: May 22, 2018, 09:22:57 am
content: Thanks for bringing this issue up. I'll admit it is something i had never given much thought to but now will.

author: apis
author_rank: Super Contributor
timestamp: May 22, 2018, 06:25:45 pm
content: Does boycotting the use of those elements make life for those children any better though? The problem is poverty and instability in these regions.

author: thm_w
author_rank: Super Contributor
timestamp: May 22, 2018, 09:57:53 pm
content: Quote from: blueskull on May 22, 2018, 06:49:47 pmWould you say the same about coffee, or chocolate?I can't see how the electronics industry is going to be any different than those, and its been shown many times that unethically sourced product makes its way into the supply chain. Even when they are certified as sustainable/fair trade/etc.http://fortune.com/big-chocolate-child-labor/http://www.newsweek.com/2015/02/13/where-apple-gets-tantalum-your-iphone-304351.htmlhttps://www.supplychaindive.com/news/conflict-mineral-verisk-maplecroft-challenges-enforcement/439840/If there are laws in place preventing important from certain countries, they can get around them by shipping to an "approved" country, which rebrands/reships the product. See olive oil, honey, and probably more examples of this (italy produces many times more olive oil than it is capable of).

author: SeanB
author_rank: Super Contributor
timestamp: May 27, 2018, 05:29:22 pm
content: Another one is trade in exotic animals. There are countries that ship massive numbers of animals for the pet trade, yet the animals are not bred there, or even naturally present there.Of course if you want ring-neck parakeets or Indian Mynahs you are very welcome to them here, where they are a massive problem, though the Mynah bird has solved one issue, it is about the only thing that likes a ground cricket appropriately named the Parktown prawn.