Help me distinguish the IRF244. - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 7th November 2008, 02:33 PM   #1
posxia is offline posxia  China
diyAudio Member
 
Join Date: Oct 2006
Default Help me distinguish the IRF244.

My dear DIYer,I bought some IRF244 in the electronic market several days ago, TO-3 package,but I never saw this Mosfet,is true or not, ths.
Attached Images
File Type: jpg Ƭ 007.jpg (43.5 KB, 349 views)
  Reply With Quote
Old 7th November 2008, 03:09 PM   #2
Magura is offline Magura  Denmark
diyAudio Member
 
Magura's Avatar
 
Join Date: Oct 2003
Location: Denmark, Viborg
They look like mine, nice fets.

http://www.datasheetcatalog.org/data.../283511_DS.pdf


Magura
__________________
Everything is possible....to do the impossible just takes a little while longer.
www.class-a-labs.com
  Reply With Quote
Old 10th November 2008, 02:58 AM   #3
posxia is offline posxia  China
diyAudio Member
 
Join Date: Oct 2006
THS Magura , I had the datasheet, but just not affirm it is IRF244 .
  Reply With Quote
Old 10th November 2008, 03:48 AM   #4
diyAudio Member
 
wrenchone's Avatar
 
Join Date: Feb 2004
Location: Silicon Valley
I've never seen IR parts in that sort of TO-3 package with the "figure 8" slug insert. All mine are in plain steel TO-3s. They may be phony or remarked parts from a second or third rate manufacturer. First off, I'd test the gate-source pins to make sure the things are even mosfets.
  Reply With Quote
Old 10th November 2008, 04:19 AM   #5
diyAudio Member
 
john-china's Avatar
 
Join Date: Feb 2001
Location: where fair living
Default this is not real IR product

this is remaked from second hand of older IR product.

but they are real mosfet which can be used in any PASS amp , also rugged , beacuse i also have some with same lables,
i used them , no problem . sonic quality is still good.
__________________
Maybe i should not be lazy again
  Reply With Quote
Old 10th November 2008, 05:01 AM   #6
diyAudio Member
 
wrenchone's Avatar
 
Join Date: Feb 2004
Location: Silicon Valley
If they were really IR product, why would they need re-marking? The only legitimate parts I've seen in those TO-3 packages are parts from vendors like Toshiba and Sanken from back in the '80s.
  Reply With Quote
Old 10th November 2008, 07:46 AM   #7
diyAudio Member
 
john-china's Avatar
 
Join Date: Feb 2001
Location: where fair living
Default because

because some want to buy irf240, anothers want to buy irf140,

so how to satisfy all of them to make higher profit. only one way , sell the mosfet remarked irf240 to one who want irf240, and
sell the mosfet remarked ir140 to one who want irf140.
but their stock has only some older irf450, irf250 ,some kinds of other irf serials.
so they must remark some kinds of IR mosfets to one serials. for example irf240. this make matching mosfet more difficult.

another reason is that some one want to buy new mosfet . remarked mosfet looks like new product.
__________________
Maybe i should not be lazy again
  Reply With Quote
Old 16th November 2008, 01:31 PM   #8
posxia is offline posxia  China
diyAudio Member
 
Join Date: Oct 2006
Thank everyone ,I had read all reply though my poor Enlish,
maybe MR. john-china is right sometimes,but please attention the image I attached , I had tested this fet, the vgs is 5V about when ID = 1a, So ,it is a IR parts sure.but I still cannot confirm is IRF244 or not
Attached Images
File Type: jpg 1212.jpg (48.5 KB, 175 views)
  Reply With Quote
Old 16th November 2008, 09:53 PM   #9
diyAudio Member
 
wrenchone's Avatar
 
Join Date: Feb 2004
Location: Silicon Valley
As far as I know, IR never used the 60-mil pins (large size) on anything smaller than their size 5 die, so the part with the big pins could be a re-marked IRF250 (or IRF150, for that matter). The parts with the "figure 8" inserts are probably re-marked Japanese mosfets and not IR product at all. Will they work in the same application? Try them and see. They may be HV mosfets with a much higher on-resistance, though.
  Reply With Quote
Old 17th November 2008, 01:56 AM   #10
posxia is offline posxia  China
diyAudio Member
 
Join Date: Oct 2006
NO,NO,I don't think so, this fet I can almost confirm it is IR parts ,because the vgs is 5V when ID = 1a, not as the HV mosfets which the vgs below 2V usually.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Datasheet for IRF244? ghee0 Solid State 8 17th March 2011 09:01 PM
E1148,CV6-How do you distinguish the anode/grid caps? protos Tubes / Valves 1 6th February 2008 04:47 PM
IRF244 for Aleph 5 ? tcl2 Pass Labs 3 13th January 2004 04:21 PM
IRF244 T03's FS woody Swap Meet 0 6th December 2002 05:42 PM
Irf244 halvardf Solid State 3 20th August 2002 02:30 AM


New To Site? Need Help?

All times are GMT. The time now is 04:51 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2