TIP127 Replacement suggestions?

Zero Cool · 28th April 2010, 05:07 PM

I am repairing an AB systems 900A amp that uses TIP122/127 Darlingtons as drivers. From what i am reading the TIP127 is a high failure rate part which explains why the three dead boards i have on hand all have then 127 removed...

Can anyone recommend a suitable replacement?

Zc

Spiny · 28th April 2010, 05:56 PM

I'd be tempted to try the TIP147, they seem quite robust and should work in the same position - 100volt darlington device like the 127

linuxguru · 28th April 2010, 06:24 PM

BDX33C/BDX34C - a 100V, 10A darlington that's multiple sourced by ON Semi, ST, Philips and maybe Infineon.

Zero Cool · 28th April 2010, 08:20 PM

I have the TIP147's in stock but they are a larger case size. It will take some magic to get them to work but it's worth a shot. I will look into the BDX parts thanks LG

Enzo · 28th April 2010, 11:56 PM

May I suggest then TIP107. It is also TO220, also 100v, but rated 8A instead of 5A.

blmn · 29th April 2010, 12:59 AM

Quote:

Originally Posted by Zero Cool

I have the TIP147's in stock but they are a larger case size. It will take some magic to get them to work but it's worth a shot. I will look into the BDX parts thanks LG

Hi,

Might the high failure rate be caused by excessive VCE or excessive dissipation over the device? In both cases I think TIP 107 will not help.

Regards,

Zero Cool · 29th April 2010, 01:34 AM

I am not exactly sure why they fail. either they fail and take out other parts, or other parts fail and take out the 127's every time. Probably when an output device fails it takes out the 127 i dunno...but the 122 never dies. so i thought i would try an alternate and see what happens.

Zc

Eva · 29th April 2010, 02:01 AM

Interestingly TIP107 has higher current gain, better DC safe operating area but worse pulsed SOA. So for audio applications it may actually help.

Internal resistors are higher value on TIP107, though.

blmn · 29th April 2010, 03:07 AM

Can we see the schematics?

28th April 2010, 05:07 PM	#1
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	TIP127 Replacement suggestions? I am repairing an AB systems 900A amp that uses TIP122/127 Darlingtons as drivers. From what i am reading the TIP127 is a high failure rate part which explains why the three dead boards i have on hand all have then 127 removed... Can anyone recommend a suitable replacement? Zc

29th April 2010, 02:01 AM	#8
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Interestingly TIP107 has higher current gain, better DC safe operating area but worse pulsed SOA. So for audio applications it may actually help. Internal resistors are higher value on TIP107, though. __________________ I use to feel like the small child in The Emperor's New Clothes tale

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
replacement tweeter suggestions for Audax TM025F1?	mondogenerator	Multi-Way	7	30th December 2010 05:27 PM
Looking for a replacement for Maggies, suggestions wanted	EEatKSU	Full Range	14	19th December 2007 11:42 PM
Dalesford Bass Driver - Any suggestions for a replacement?	MCH786	Multi-Way	2	1st January 2007 03:25 PM
Suggestions for CD960 audio out cap replacement	@lf	Digital Source	10	10th November 2006 02:54 PM
5533 replacement suggestions?	ubertar	Chip Amps	0	26th August 2004 01:15 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

28th April 2010, 05:56 PM	#2
Spiny diyAudio Member Join Date: Feb 2008	I'd be tempted to try the TIP147, they seem quite robust and should work in the same position - 100volt darlington device like the 127

28th April 2010, 06:24 PM	#3
linuxguru diyAudio Member Join Date: Sep 2007	BDX33C/BDX34C - a 100V, 10A darlington that's multiple sourced by ON Semi, ST, Philips and maybe Infineon.

28th April 2010, 08:20 PM	#4
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	I have the TIP147's in stock but they are a larger case size. It will take some magic to get them to work but it's worth a shot. I will look into the BDX parts thanks LG

28th April 2010, 11:56 PM	#5
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	May I suggest then TIP107. It is also TO220, also 100v, but rated 8A instead of 5A.

29th April 2010, 01:34 AM	#7
Zero Cool Audio Junkie diyAudio Member Join Date: Sep 2004 Location: MN	I am not exactly sure why they fail. either they fail and take out other parts, or other parts fail and take out the 127's every time. Probably when an output device fails it takes out the 127 i dunno...but the 122 never dies. so i thought i would try an alternate and see what happens. Zc

29th April 2010, 03:07 AM	#9
blmn diyAudio Member Join Date: Feb 2001 Location: .	Can we see the schematics?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)