Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

D44H11/D45H11 Questions
D44H11/D45H11 Questions
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 12th January 2004, 08:32 PM   #1
pjacobi is offline pjacobi  Germany
diyAudio Member
Join Date: Jan 2004
Location: Hamburg
Send a message via AIM to pjacobi Send a message via MSN to pjacobi Send a message via Yahoo to pjacobi
Default D44H11/D45H11 Questions

I have some questions about these BJTs:

- Who was the original manufacturer and when did their production start?

- Taking the datasheets at face value, they are very fine devices in their class
(hfe linearity and value), but they are
hardly ever found in amp designs.
Any possible reason?

- Any idea where to order them for
small quantities in Germany or the EU?

Peter Jacobi
  Reply With Quote
Old 13th January 2004, 11:08 AM   #2
Pjotr is offline Pjotr
diyAudio Member
Pjotr's Avatar
Join Date: Nov 2002
Location: Netherlands
Default Re: D44H11/D45H11 Questions

Originally posted by pjacobi

- Any idea where to order them for
small quantities in Germany or the EU?

  Reply With Quote
Old 15th January 2004, 03:07 AM   #3
jcx is offline jcx  United States
diyAudio Member
Join Date: Feb 2003
Location: ..
my guess is General Electric may have originated them, Harris picked up much of that line as far as I can tell

with the soa boundary nearly passing through 500 mA 30 V they probably make good headphone drivers/op amp buffers - at <100 mA they reach thier Vce ratings and could be drivers for more substantial output devices in <50W amps

I intend to use up the proto stock at work but not to buy any new ones, more modern devices should have better soa and lower Cout but they do look substanially better than the TIP devices of the same era
  Reply With Quote
Old 24th September 2004, 09:16 AM   #4
sinigersky is offline sinigersky  Germany
diyAudio Member
sinigersky's Avatar
Join Date: Sep 2004
Location: Bulgaria
Now they are manufactired by ON Semiconductor, www.onsemi.com.

I think this company is somehow connected to Motorola, but I'm not sure...
  Reply With Quote


D44H11/D45H11 QuestionsHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Some Quad els57 questions! - Novice Questions! Fanuc Planars & Exotics 13 5th December 2007 09:26 AM
A2 Questions Svetlana Tubes / Valves 16 1st September 2006 02:37 PM
sub questions kejolly Subwoofers 1 3rd November 2005 01:17 PM
Questions, questions, from newb DIYer Phatman91624 Multi-Way 41 3rd August 2002 02:52 AM

New To Site? Need Help?

All times are GMT. The time now is 06:42 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio