TO-3 or TO-247? - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

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
Thread Tools Search this Thread
Old 25th March 2003, 03:56 PM   #21
diyAudio Member
N-Channel's Avatar
Join Date: Mar 2003
Location: Sol System
Send a message via AIM to N-Channel
I would try the TO-3BPL case, otherwise known as the TO-264. (If you're not doing MOSFETs.) On Semiconductor (formerly Motorola) makes an NPN-PNP Complimentary bi-polar pair under the part numners MJL1302A and MJL2381A. Both have a 200Vce breakdown, and an Hfe of ~45, with an Ft of 30MHz. SWEET!
-. ---.. -..- ---
  Reply With Quote
Old 25th March 2003, 07:22 PM   #22
diyAudio Member
Bernhard's Avatar
Join Date: Apr 2002
Location: Munich
Originally posted by Sch3mat1c
...Except tubes glowing in their All-Mighty (see God Of Triodes ) Greatness.
...Except purple-blue plasma flames

Click the image to open in full size.
  Reply With Quote
Old 26th March 2003, 10:05 AM   #23
diyAudio Member
Join Date: Sep 2002
Location: Holly Springs, NC, USA
Send a message via Skype™ to LukasLouw
--TO-3 or TO-247?

What is a good rule of thumb
for determining how many TO-3's
you need vs. TO-247 when paralleling
output stages.


suppose a design calls for 8
TO-247 pa

You'd have to do a SOA analysis, TO247 transistors with teh same size die a TO3 will be derated more, and the SOA will vary too much between different types of devices to generalize.

Hope that helps,
  Reply With Quote
Old 26th March 2003, 01:36 PM   #24
diyAudio Member
N-Channel's Avatar
Join Date: Mar 2003
Location: Sol System
Send a message via AIM to N-Channel
Just to clarify, a TO-264 is like a Super-sized TO-247 , using the same footprint.
-. ---.. -..- ---
  Reply With Quote


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

New To Site? Need Help?

All times are GMT. The time now is 06:00 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2