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Aug 17 '17 at 17:23 comment added svenema @AliChen; Yes, I see what you mean, I thought the 100ohms were for protection, but I guess it works against you when soldering. And I'm now switching to SMD, learing Eagle as we speak... :D
Aug 17 '17 at 17:03 comment added Ale..chenski @svenema BTW, rare SMDs need hot air pencil/gun. I still think in this case that the soldering iron has a substantial leakage to 110V/220 AC mains, and this is what is killing the FETs. The unnecessary 100 Ohms resistors on transistors gates only aggravate the issue.
Aug 17 '17 at 12:13 comment added Volodymyr Smotesko @svenema 2N7002CK is N-channel MOSFET with gate protection zener diodes built in. It is SMD though, but it's better to start working with SMD sooner than later these days.
Aug 17 '17 at 9:10 comment added svenema You're right, and I've ordered a TS-100, the iron that is making waves on the internet right now, not everyone likes is, but it runs on 24V, as does my car, so it's a great travelling companion. Also ordered a hot air solder station to get started on SMD. Even though my iron was only €15, I have always been quite happy with it.
Aug 14 '17 at 22:34 comment added Lorenzo Donati -- Codidact.com @svenema Ditch that soldering iron! If you are a bit serious in your hobby, buy a proper soldering station, even a cheap one. Soldering irons directly connected to mains are not suitable for electronics, especially when you are dealing with sensitive devices such as MOSFETs and ICs.
Aug 14 '17 at 22:31 comment added Lorenzo Donati -- Codidact.com @CL. TL;DR. The point I was trying to make was that the OP would have been extremely careless to kill all those mosfets by simple mishandling. There is something repetitive in his problem, hence I suspected a unsuitable soldering iron.
Aug 14 '17 at 22:30 comment added Lorenzo Donati -- Codidact.com @CL Well, 20 years ago the 2N7000 was a relatively new thing, at least here in Italy, especially in the hobby market (low power, vertical "power" mosfet). The majority of other MOSFETs were easily killed by simply touching them without an ESD protection wrist band. I never managed to kill a 2N7000 by simple handling or soldering with a soldering station. So, yes, compared with older MOSFETs 2N7000 is fairly rugged. Yes, I know that handling that device without proper ESD countermeasures could degrade its performance, but for hobby work that is usually not a big issue.
Aug 14 '17 at 14:33 comment added svenema Is there a better protected/more modern drop-in replacement for this FET that is not SMD?
Aug 14 '17 at 14:26 comment added CL. The 2N7000 is older than 20 years, and not rugged at all. Many other FETs add a Zener to the gate.
Aug 14 '17 at 14:00 comment added svenema It's one of these: conrad.nl/nl/…
Aug 14 '17 at 12:57 comment added svenema Cheapo Toolcraft/Conrad, direct to mains iron. I noticed that the tip was connected to ground. That's good or bad? An upgrade to a more professional station is high on my wishlist ;-)
Aug 14 '17 at 12:42 history answered Lorenzo Donati -- Codidact.com CC BY-SA 3.0