What is ESD Supressor, High Withstanding Type - Page 1
Forum section: electronics / projects

author: coppercone2
author_rank: Super Contributor
timestamp: January 25, 2021, 01:32:14 am
content: https://industrial.panasonic.com/ww/esd_suppressor_high_withstanding_typeOk so it has the circuit diagram of a normal diode but the picture of it makes it look like a mini air spark gap.Is this thing just a ghetto GDT without the nice gasses (I guess closed air spark gap) that is penciled in as a diode for whatever reason? Now it does appear to have a faster trigger then a GDT, so that is interesting.

author: gnuarm
author_rank: Super Contributor
timestamp: January 25, 2021, 03:04:33 am
content: Quote from: coppercone2 on January 25, 2021, 01:32:14 amYes, pretty much. I had a CRT (you remember those, right?) computer monitor from a major manufacturer that had a design flaw. They used a very high voltage on the CRT so for safety included discharge devices like these to bleed off excessively high voltages lest the electron beam get so energetic it produced X-rays. It started making a snapping noise once in a while, but over time it became more frequent to where it would snap every five minutes or so. The Internet wasn't so advanced at that time and it took a while to get a response from the maker, but eventually they sent me another monitor. Within a month or so when that monitor started showing the same symptoms they sent a third but a different model with a different design.I recall looking at the devices and they were a bit different. They were a block of plastic (through hole mounted I believe) with a very thin slit in it. I expected the slit was the actual gap. I suppose the gap is enclosed in this device so the breakdown voltage is not impacted by dust or moisture.

author: coppercone2
author_rank: Super Contributor
timestamp: January 25, 2021, 03:22:40 am
content: I mean the graph speaks for itself because I cannot complain about the speed but they caused me alot of confusion trying to fit it into a circuit,as far as I know the diagram picture should be a GDT but maybe its optimized use arc discharge to mimic a diode/tvs threshold so much that it does not fulfill the traditional role of a GDT so they thought it would cause more hard them good if someone thought it would offer GDT like protection for a circuit (much cheaper) instead of having its own roll to fill, if it was just someone looking at symbols (parameters are so different to regular GDT).or is there some japanese thing going on where they don't use or like GDT for some reason? maybe its done to get rid of the people that will just go 'oh its not telecom we don't need that' (every thing is done in their power to remove cost by any justification).'Now what I have seen is MOV with a slit in em I think to act as a GDT and those stupid PCB copper fingers to act like a lower cost version of this part.now it looks like china is more honest then japan in this casehttps://www.aliexpress.com/item/32794337783.html?spm=a2g0o.search0302.0.0.6c677ee85zk0xp&algo_pvid=b1fbf587-8788-4e79-8ad0-15aa174e3dd2&algo_expid=b1fbf587-8788-4e79-8ad0-15aa174e3dd2-46&btsid=0bb0600116115453514946968ea291&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

author: coppercone2
author_rank: Super Contributor
timestamp: January 25, 2021, 03:32:38 am
content: and i missed it on littlefuse because their product photo sucks, I thought it was a white box. don't put white on white in a little thumbnail, make the background green.https://www.littelfuse.com/products/gas-discharge-tubes/squared-gdt.aspxso just to compare these to the panasonic ones and see if its differentSo, why does the panasonic one have such a sharp pulse but the littlefuse has a slow pulse? Its hard to read the graph because the X axis is different. I assume that little fuse use a slow pulse so they can show you the operating regions nuances unlike panasonic.SO there looks to be no reason to get this unless you are pressed for space.