Antique Engines and Old Iron
[Home] - [HELP] - [Forums] - [Library] - [Photo Gallery] - [Groups] - [Classified Ads] - [Subscribe] - [Links] - [Books] - [Sponsors] -

Go Back   SmokStak > SmokStak® Vintage Electrical Equipment > Amateur "HAM" Radio
Forgot Password? Join Us!

Notices

Amateur "HAM" Radio Radio Amateurs, Morse Code, Transmitter Tubes, Vintage Equipment, Antennas

Amateur

Transistors?


this thread has 5 replies and has been viewed 391 times

Reply
 
Thread Tools Display Modes
  #1  
Old 07-13-2019, 01:06:04 AM
Railroads Railroads is offline
Registered-III
 
Join Date: Sep 2013
Location: North Carolina, USA
Posts: 2,007
Thanks: 1,783
Thanked 1,798 Times in 783 Posts
Default Transistors?

Hey everyone, I've got my old Endurance 800 watt inverter all in pieces for rebuild but am having some issues with finding Mosfet replacements. Poor thing has been in ruins in a box for 5 years. Seems IRF became part of Infineon Tech in 2015. Argh, Why do these companies gotta keep merging and changing? Seems IRF640B is one scarce Mosfet? I see plenty available from China, But I am a bit concerned about receiving fakes?

The other Mosfets I need are IRF3205 which seem a little easier to find thank goodness.

The IRF640B seems to cross to Infineon BUZ30AH. Looking at the datasheets, it would appear the BUZ30AH might be a slightly better part than the old IRF640B?

The IRF3205 doesn't seem to cross to a exact Mosfet from Infineon?

Robert
Reply With Quote
Sponsored Links
  #2  
Old 07-14-2019, 11:32:00 PM
Jim McIntyre's Avatar
Jim McIntyre Jim McIntyre is online now
Subscriber
 
Join Date: Nov 2004
Location: Mooresville, Indiana, USA
Posts: 4,520
Thanks: 867
Thanked 2,688 Times in 1,540 Posts
Default Re: Transistors?

THe IRF604N is in stock at Digikey:

https://www.digikey.com/product-deta...NPBF-ND/811884

I'm not sure what the 'N' suffix means, but the specs look pretty close. (The PBF part if just lead-free).

They have the 3205 as well:

https://www.digikey.com/product-deta...NPBF-ND/811884

Mouser might have them too, but their site is down now. They don't have a minimum order.
Reply With Quote
  #3  
Old 07-17-2019, 08:32:34 AM
Tracy T Tracy T is offline
Subscriber
 
Join Date: May 2009
Location: Cedarbluff, Virginia, USA
Posts: 2,710
Thanks: 866
Thanked 1,401 Times in 825 Posts
Default Re: Transistors?

for those of us trying to follow along, is this a acurate description?

mosfet= metal–oxide–semiconductor field-effect transistor
Reply With Quote
  #4  
Old 07-17-2019, 09:56:55 PM
Jim McIntyre's Avatar
Jim McIntyre Jim McIntyre is online now
Subscriber
 
Join Date: Nov 2004
Location: Mooresville, Indiana, USA
Posts: 4,520
Thanks: 867
Thanked 2,688 Times in 1,540 Posts
Default Re: Transistors?

^ Yes.

The one RR is needing are high power ones, at least relative to the literally billions of MOSFETs in a smart phone...

and now the IRF604 isn't in stock at Digikey. I'd guess this sub would be fine:

https://www.digikey.com/product-deta...20F-ND/1830669
Reply With Quote
The Following User Says Thank You to Jim McIntyre For This Post:
  #5  
Old 07-20-2019, 01:04:42 AM
Railroads Railroads is offline
Registered-III
 
Join Date: Sep 2013
Location: North Carolina, USA
Posts: 2,007
Thanks: 1,783
Thanked 1,798 Times in 783 Posts
Default Re: Transistors?

Yes, We are talking about the high power kind of Mosfet for a inverter rebuild.

Digikey was out of the first recommendation.

According to Infineon who owns IRF, The IRF640B has been replaced by BUZ30AH. The BUZ30AH is 200v at 21 amps.

Funny enough, Infineon couldn't directly answer my questions about the IRF3205. They don't even have the 3205 in their cross reference search? Infineon claims on their website the IRF3205 is considered obsolete. Digikey shows them as active though? Confusing.

So, Someone a bit more familiar with transistors hopefully can let me know if there is an exact drop in for the IRF3205? I'd prefer 120 amp rating at 60 to 80 volts if possible?

Originally this old inverter had caps rated 3300uf x4. I'm replacing them with 4700uf at 25v caps from Rubycon. The lone 200v 330uf cap has given way to a 470uf at 200v.

Robert
Reply With Quote
The Following User Says Thank You to Railroads For This Post:
  #6  
Old 07-20-2019, 01:26:17 PM
Railroads Railroads is offline
Registered-III
 
Join Date: Sep 2013
Location: North Carolina, USA
Posts: 2,007
Thanks: 1,783
Thanked 1,798 Times in 783 Posts
Default Re: Transistors?

How would the IRFP3306PbF compare to the 3205 as a replacement? Infineon recognizes the IRFP3306PbF as an active and preferred Mosfet over the 3205.

I was also looking at maybe the IRF3808 or IRF1405?

Robert
Reply With Quote
Reply

Bookmarks


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

F o r u m Jump


Use "Ctrl" mouse wheel to change screen size.
All times are GMT -4. The time now is 01:19:59 AM.

Smokstak and Enginads site search!


All use is subject to our TERMS OF SERVICE
SMOKSTAK® is a Registered Trade Mark - A Community of Antique Engine Enthusiasts
Copyright © 2000 - 2019 by Harry Matthews P.O. Box 5612 - Sarasota, FL 34277