Author Topic: What actually kills MOSFETs?  (Read 492 times)

Offline FPS

  • High Voltage Enthusiast
  • *
  • Posts: 45
  • Karma: +0/-0
    • View Profile
What actually kills MOSFETs?
« on: March 22, 2024, 05:09:20 AM »
When used to drive transformer primaries, MOSFETs often die when used within their rated specs, they should be able to handle that voltage/current at least on paper.  Is this effect analogous to mismatched antennas on radio transmitters?

Offline AstRii

  • High Voltage Engineer
  • ****
  • Posts: 260
  • Karma: +9/-0
  • Czech Technical University in Prague
    • View Profile
    • UHVlab - Tesla Coils | High Voltage | Education
Re: What actually kills MOSFETs?
« Reply #1 on: March 22, 2024, 03:37:11 PM »
Quote
MOSFETs often die when used within their rated specs

If you're only looking at datasheet specs like their rated voltage and current, then yes. However there is so much more information in the datasheet which is often overlooked. Perhaps most importantly:


The fact that a MOSFET can handle 500V at 100A, doesn't mean it will handle it however you like. There are limitations to how long and how often can a MOSFET take such abuse.

Thermal capabilities also cannot be overlooked! If you're using a large heatsink it doesn't necessarily mean that the chip temperature cannot reach over 150C.

In my experience; in hobbyist electronics MOSFETs die mostly due to people not paying sufficient attention to datasheet or wrong circuit design. Where as in consumer electronics, MOSFETs die most often due to poor thermal contact between the FET and heatsink.
« Last Edit: March 22, 2024, 03:40:17 PM by AstRii »
Bc. Marek Novotny
Czech Republic, Czech Technical University in Prague
www.uhvlab.org

Offline unrealcrafter2

  • High Voltage Enthusiast
  • *
  • Posts: 10
  • Karma: +0/-0
    • View Profile
Re: What actually kills MOSFETs?
« Reply #2 on: April 18, 2024, 10:03:48 PM »
I personally find MOSFETs die from sudden spikes in voltage. Especially on the gate. It is possible to overheat them too, especially if it's not heatsinked.

High Voltage Forum

Re: What actually kills MOSFETs?
« Reply #2 on: April 18, 2024, 10:03:48 PM »

 


* Recent Topics and Posts

post Re: Pulse Power High Current Discharges from 3 Phase PFC Capacitors
[Capacitor Banks]
MRMILSTAR
Today at 05:22:43 AM
post Re: Want to build HV HF oscilloscope probe.
[Electronic Circuits]
Twospoons
Today at 05:08:46 AM
post Re: Pulse Power High Current Discharges from 3 Phase PFC Capacitors
[Capacitor Banks]
davekni
Today at 04:49:16 AM
post Re: Ring Launcher AC vs DC?
[Induction Launchers, Coil Guns and Rails guns]
FPS
Today at 03:55:37 AM
post Re: Want to build HV HF oscilloscope probe.
[Electronic Circuits]
klugesmith
Today at 02:48:22 AM
post Re: Want to build HV HF oscilloscope probe.
[Electronic Circuits]
Domo
Today at 02:05:05 AM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
Today at 01:43:10 AM
post Re: Want to build HV HF oscilloscope probe.
[Electronic Circuits]
Twospoons
May 18, 2024, 11:30:11 PM
post Re: Pulse Power High Current Discharges from 3 Phase PFC Capacitors
[Capacitor Banks]
MRMILSTAR
May 18, 2024, 10:10:56 PM
post Want to build HV HF oscilloscope probe.
[Electronic Circuits]
Domo
May 18, 2024, 09:46:17 PM
post Re: Pulse Power High Current Discharges from 3 Phase PFC Capacitors
[Capacitor Banks]
davekni
May 18, 2024, 08:05:36 PM
post Re: Help an EE student
[General Chat]
Twospoons
May 18, 2024, 05:59:21 AM
post Re: What capacitor configuration to explode foil?
[Capacitor Banks]
MRMILSTAR
May 18, 2024, 05:44:41 AM
post Re: RDRSSTC - Project Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
ZakW
May 18, 2024, 01:55:42 AM
post Re: What capacitor configuration to explode foil?
[Capacitor Banks]
klugesmith
May 17, 2024, 11:49:33 PM
post Re: Pulse Power High Current Discharges from 3 Phase PFC Capacitors
[Capacitor Banks]
MRMILSTAR
May 17, 2024, 10:18:46 PM
post Pulse Power High Current Discharges from 3 Phase PFC Capacitors
[Capacitor Banks]
Mads Barnkob
May 17, 2024, 07:24:22 PM
post Re: What capacitor configuration to explode foil?
[Capacitor Banks]
Mads Barnkob
May 17, 2024, 07:14:35 PM
post Re: Help an EE student
[General Chat]
Mads Barnkob
May 17, 2024, 08:35:38 AM
post Re: Help an EE student
[General Chat]
MRMILSTAR
May 17, 2024, 05:34:10 AM
post Re: colored 50 Ohm coax
[General Chat]
Da_Stier
May 16, 2024, 10:53:53 PM
post Re: Help an EE student
[General Chat]
Michelle_
May 16, 2024, 10:37:50 PM
post Re: Help an EE student
[General Chat]
davekni
May 16, 2024, 10:29:30 PM
post Re: Help an EE student
[General Chat]
klugesmith
May 16, 2024, 08:26:41 PM
post Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
davekni
May 16, 2024, 06:54:05 PM
post Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
NyaaX_X
May 16, 2024, 05:04:41 PM
post Re: Tesla Synth Player for Syntherrupter
[Computers, Microcontrollers, Programmable Logic, Interfaces and Displays]
AntoineRcbs
May 16, 2024, 12:13:47 PM
post Re: Help with primary voltages of unknown transformer
[Transformer (Ferrite Core)]
Domo
May 16, 2024, 06:58:12 AM
post Re: New EE student asks about Cutting-Edge fields
[General Chat]
davekni
May 16, 2024, 06:47:09 AM
post Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
NyaaX_X
May 16, 2024, 06:00:49 AM
post Re: New EE student asks about Cutting-Edge fields
[General Chat]
Twospoons
May 16, 2024, 05:45:08 AM
post Re: New EE student asks about Cutting-Edge fields
[General Chat]
davekni
May 16, 2024, 05:03:41 AM
post Re: DRSSTC grounding issues
[Dual Resonant Solid State Tesla coils (DRSSTC)]
davekni
May 16, 2024, 04:58:40 AM
post Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
davekni
May 16, 2024, 04:36:40 AM
post Re: colored 50 Ohm coax
[General Chat]
klugesmith
May 16, 2024, 12:28:27 AM
post Re: Watercooling
[Dual Resonant Solid State Tesla coils (DRSSTC)]
acobaugh
May 15, 2024, 11:13:48 PM
post Re: Help with primary voltages of unknown transformer
[Transformer (Ferrite Core)]
klugesmith
May 15, 2024, 10:58:05 PM
post colored 50 Ohm coax
[General Chat]
Da_Stier
May 15, 2024, 08:31:48 PM
post Re: DRSSTC grounding issues
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Mads Barnkob
May 15, 2024, 07:56:38 PM
post Re: DRSSTC grounding issues
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
May 15, 2024, 06:29:59 PM
post Re: Watercooling
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Felix B.
May 15, 2024, 04:04:14 PM
post Re: Schmitt trigger schematic question
[Electronic Circuits]
Michelle_
May 15, 2024, 03:32:57 PM
post DRSSTC grounding issues
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Felix B.
May 15, 2024, 03:07:39 PM
post New EE student asks about Cutting-Edge fields
[General Chat]
samsonwilliams
May 15, 2024, 05:50:59 AM
post Re: Help with primary voltages of unknown transformer
[Transformer (Ferrite Core)]
Domo
May 15, 2024, 05:38:14 AM
post Re: Schmitt trigger schematic question
[Electronic Circuits]
Benjamin Lockhart
May 15, 2024, 04:58:02 AM
post Re: Big Coil Build Log
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
May 15, 2024, 04:34:49 AM
post Re: Watercooling
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
May 15, 2024, 04:30:18 AM
post Re: Watercooling
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
May 15, 2024, 04:00:55 AM
post Re: Watercooling
[Dual Resonant Solid State Tesla coils (DRSSTC)]
flyingperson23
May 15, 2024, 03:21:51 AM
post Re: Schmitt trigger schematic question
[Electronic Circuits]
Michelle_
May 14, 2024, 11:12:22 PM
post Re: Schmitt trigger schematic question
[Electronic Circuits]
Benjamin Lockhart
May 14, 2024, 11:00:00 PM
post Schmitt trigger schematic question
[Electronic Circuits]
Michelle_
May 14, 2024, 09:45:38 PM
post Re: Help with primary voltages of unknown transformer
[Transformer (Ferrite Core)]
klugesmith
May 14, 2024, 09:02:28 PM
post Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
Michelle_
May 14, 2024, 05:55:24 AM
post Re: Weird AC/DC mini SSTC build review
[Solid State Tesla Coils (SSTC)]
Michelle_
May 14, 2024, 05:44:12 AM
post Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
MRMILSTAR
May 14, 2024, 05:11:54 AM
post Re: Help with primary voltages of unknown transformer
[Transformer (Ferrite Core)]
alan sailer
May 13, 2024, 11:44:56 PM
post Re: Help with primary voltages of unknown transformer
[Transformer (Ferrite Core)]
Domo
May 13, 2024, 10:28:34 PM
post Re: Help with primary voltages of unknown transformer
[Transformer (Ferrite Core)]
alan sailer
May 13, 2024, 10:20:19 PM
post Re: Help with primary voltages of unknown transformer
[Transformer (Ferrite Core)]
Domo
May 13, 2024, 09:27:58 PM
post Re: Help with primary voltages of unknown transformer
[Transformer (Ferrite Core)]
alan sailer
May 13, 2024, 09:06:59 PM
post Help with primary voltages of unknown transformer
[Transformer (Ferrite Core)]
Domo
May 13, 2024, 08:43:49 PM
post Re: Benjamin's DRSSTC 2 in progress
[Dual Resonant Solid State Tesla coils (DRSSTC)]
Benjamin Lockhart
May 13, 2024, 07:25:29 PM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
OmGigaTron
May 13, 2024, 06:50:59 PM
post Re: Weird AC/DC mini SSTC build review
[Solid State Tesla Coils (SSTC)]
Michelle_
May 13, 2024, 03:47:08 PM
post Re: Small-ish 3D printed SGTC via cheap ZVS flyback build, humbly asking a couple ?s
[Spark Gap Tesla Coils (SGTC)]
Michelle_
May 13, 2024, 03:42:58 PM
post Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
NyaaX_X
May 13, 2024, 07:09:16 AM
post Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
davekni
May 13, 2024, 05:02:46 AM
post Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
NyaaX_X
May 13, 2024, 02:25:25 AM
post Re: Plasma Torid - Class E Self Resonant Dual/Stereo - Plasma Torid Build
[Dual Resonant Solid State Tesla coils (DRSSTC)]
alan sailer
May 13, 2024, 01:39:11 AM
post Re: Plasma Toroid
[Solid State Tesla Coils (SSTC)]
alan sailer
May 13, 2024, 01:33:21 AM
post Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
davekni
May 12, 2024, 10:56:53 PM
post Re: Quick question about steve ward mini SST5 resonant frequency
[Solid State Tesla Coils (SSTC)]
NyaaX_X
May 12, 2024, 05:10:40 PM
post Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
Michelle_
May 12, 2024, 04:24:44 PM
post Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
alan sailer
May 12, 2024, 04:10:54 PM
post Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
Michelle_
May 12, 2024, 04:04:11 PM
post Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
hal7rr
May 12, 2024, 03:56:57 PM
post Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
Michelle_
May 12, 2024, 03:46:45 PM
post Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
hal7rr
May 12, 2024, 02:59:16 PM
post Re: Quick question about steve ward mini SST5 resonant frequency
[Solid State Tesla Coils (SSTC)]
Michelle_
May 12, 2024, 02:51:27 PM
post Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
Michelle_
May 12, 2024, 02:49:42 PM
post Re: Quick question about steve ward mini SST5 resonant frequency
[Solid State Tesla Coils (SSTC)]
ZakW
May 12, 2024, 08:34:39 AM
post Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
ZakW
May 12, 2024, 08:30:29 AM
post Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
Michelle_
May 12, 2024, 02:35:17 AM
post Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
alan sailer
May 12, 2024, 02:07:32 AM
post Re: Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
Michelle_
May 11, 2024, 09:55:59 PM
post Re: Help with LabCoatz's Staccato QCW DRSSTC
[Beginners]
NyaaX_X
May 11, 2024, 06:16:22 PM
post Help with LabCoatz's Staccato QCW DRSSTC Tesla Coil
[Beginners]
hal7rr
May 11, 2024, 05:24:34 PM
post Re: Type 77 Metglas Laced Ferrite Core
[General Chat]
NyaaX_X
May 11, 2024, 10:39:24 AM
post Re: Type 77 Metglas Laced Ferrite Core
[General Chat]
Mads Barnkob
May 11, 2024, 07:02:20 AM
post Re: Aluminum electrolytic capacitor ripple current issue
[Beginners]
NyaaX_X
May 11, 2024, 06:40:50 AM
post Type 77 Metglas Laced Ferrite Core
[General Chat]
paulp1776
May 11, 2024, 06:23:59 AM
post Re: Weird AC/DC mini SSTC build review
[Solid State Tesla Coils (SSTC)]
Michelle_
May 11, 2024, 05:27:22 AM
post Re: Quick question about steve ward mini SST5 resonant frequency
[Solid State Tesla Coils (SSTC)]
alan sailer
May 11, 2024, 01:37:37 AM
post Re: designing and building electron gun help!
[General Chat]
Twospoons
May 11, 2024, 12:10:44 AM
post designing and building electron gun help!
[General Chat]
Luca c.
May 10, 2024, 09:38:05 PM
post Re: Quick question about steve ward mini SST5 resonant frequency
[Solid State Tesla Coils (SSTC)]
Michelle_
May 10, 2024, 09:24:21 PM
post Re: Quick question about steve ward mini SST5 resonant frequency
[Solid State Tesla Coils (SSTC)]
alan sailer
May 10, 2024, 08:43:11 PM
post Quick question about steve ward mini SST5 resonant frequency
[Solid State Tesla Coils (SSTC)]
Michelle_
May 10, 2024, 08:33:47 PM

Sitemap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 
SimplePortal 2.3.6 © 2008-2014, SimplePortal