HIGH resistance MOSFET - Page 1
Forum section: electronics / general

author: Poe
author_rank: Frequent Contributor
timestamp: May 23, 2013, 04:54:55 pm
content: Not sure if it was intentional, but it sure got my attention:http://www.eeweb.com/news/high-on-state-resistance-mosfet/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+EEWebDesignNews+EEWeb+Design+News

author: Neilm
author_rank: Super Contributor
timestamp: May 23, 2013, 07:14:29 pm
content: Wonder how quickly that will get changed

author: andete
author_rank: Contributor
timestamp: May 23, 2013, 08:17:37 pm
content: Haha, I noticed that as well in my RSS Feed

author: nanofrog
author_rank: Super Contributor
timestamp: May 24, 2013, 04:53:10 am
content: For some reason the following image seems appropriate.

author: TheRevva
author_rank: Regular Contributor
timestamp: May 24, 2013, 10:15:47 am
content: Assuming it's an 'N channel FET' being advertised, I wonder if they are marketing its complementary pair...I guess that would have to be a LOW resistance OFF-State P-Channel device.Either device would have a maximum usable gain around 0.00001.However, users are warned to ALWAYS drive the P-Channel devices VERY hard as it appears that whenever they are under-driven, they let out the magic smoke.(Or perhaps it just needs external current limiting when it's in the 'off state'?)I'll be keeping a watch out for future devices from them.I'm expecting both a cap-uctor and ind-actitor to be released shortly. Either of these devices should go a long way towards helping to eliminate ANY reactance at ANY frequency by combing only the BEST features of inductors and capacitors. .

author: amyk
author_rank: Super Contributor
timestamp: May 24, 2013, 10:25:40 am
content: I suspect this might've been the result of someone who doesn't know electronics at all trying to summarise the article; from the source:Quoteand it's natural for someone who doesn't know to associate "best" -> "high".

author: kfitch42
author_rank: Frequent Contributor
timestamp: May 24, 2013, 06:55:40 pm
content: Quote from: TheRevva on May 24, 2013, 10:15:47 amGREAT IDEA! You can even value-add your supply-chain by synergizing manufacturing onto a single line and differentiating in packaging! Just send DMCA takedown notices to anyone who mentions parasitics!

author: eKretz
author_rank: Frequent Contributor
timestamp: May 24, 2013, 07:37:12 pm
content: I have a device that uses low-on-resistance (~2 milliohm, the old highest?!) P- and N-channel FETs. It has had all kinds of abuse and been run at higher than OEM power levels with no issues. Maybe I am doing it good by beating on it? heh. These new ST ones have higher ratings on voltage and amperage though, maybe I could use them for an upgrade. They are different package size though, dangit. Current devices are FDD4141 and FDD8447L DPaks.

author: TheRevva
author_rank: Regular Contributor
timestamp: May 24, 2013, 08:12:08 pm
content: Quote from: kfitch42 on May 24, 2013, 06:55:40 pmGood point!!! However, I do have some issues with your prototype pictures:1: You've CLEARLY mis labeled the pix. The first one is, obviously, a cap-uctor whilst the second one is an ind-acitor.2: I note that you've also coiled both (leading to some level of direct inductance), and seemingly attached insulation too (which would possibly make for a dielectric for parasitic capacitance).In contrast, the device prototype I had imagined bore a striking resemblance to.... "A big lump of metal"I guess I only have myself to blame for not inserting enough detail into the specifications I prepared for the R&D dept?I'll try to do better when I draw up specifications of the Field Effect Resistor, High Gain Wire etc.I've almost finished on my novel extension to a diode... I call it a monode (formed by cutting a traditional 1N4007 diode in half).By separating the two halves a suitable amount, I was able to achieve reliable "two-way rectification" at fairly high voltages (although I experienced problems above 99kV with my $5 DMM!)And by twisting the leads of each half together, I could achieve fairly reliable "zero-way rectification" (once again though, I experienced problems, but only at high power. There seems to be a limit around 100kW!)My experience has taught me that much within the electronics field is concentrated upon either attenuation or amplification.The traditional diode only does a little under HALF the attenuation job. My novel monode can DOUBLE that efficiency and seems to work well from DC up to very high frequencies.Edit: I'm not going to mention my LER (Light Emitting Resistor). I'm having problems with repeatability. It only seems to work once... And only at fairly high power!

author: kfitch42
author_rank: Frequent Contributor
timestamp: May 24, 2013, 08:28:01 pm
content: Quote from: TheRevva on May 24, 2013, 08:12:08 pmYou should patent that, then sue Thomas Edison!!!!!!!!!