TIP35C Failure

Peter1960 · 19th August 2005, 06:42 AM

Hi,

We have been using TIP35C in our solid state amps for a few years now.

In th past 6 months the failure rate of breakdown has gone up dramatically.

Can anyone shed some light on this?

Has anyone expienced the same?

The circuit has not changed, and we had a unit come back after 6 years in use, with a minor resistor failure only.

We still use the same supplier.

Any thoughts welcome and appreciated.

regards

Peter

richie00boy · 19th August 2005, 09:08 AM

Same supplier or same semiconductor manufacturer?

edl · 19th August 2005, 10:45 AM

Dear Peter!

Maybe you receiving fake TIP35C's.
For more info's chevk this page:
http://www.sound.westhost.com/counterfeit.htm

Regards

(Anyway, I am courios about the schematic, shall we see it? Thanks!)

Workhorse · 19th August 2005, 11:08 AM

Hi Peter,

We also face the same situation of failure rate once upon a while, though it was due to the changing of manufacturer of a compensation cap from on company to another...

kindly check all the components in your circuit whom are subjected to change in manufacturing firm or suppliers...

dont worry....but in my case i get upset very much.....

K a n w a r

LukasLouw · 19th August 2005, 11:15 AM

I just ran into a batch of ST TIP35C/36C transistors in a client's amps that seem to be fake, Low gain, high saturation, and they blow for no apparent reason.

Although Iv'e had good luck using the ST parts in clients' designs teh last 5 years or so, with several hundred thousand parts used, if not millions, in various models, and this is the first time Iv'e seen problems, so have to assume theyr'e fake. These are sourced in China by OEM factories there.

For now wer'e switching over to ON Semi parts till teh ST part sourcing problem can be cleared up.

Lukas

Eva · 19th August 2005, 04:47 PM

These pictures show genuine TIP35C and TIP36C from various sources. All them survived producing 180W@4 ohms with +-41V regulated rails and a single pair of output devices (quite though a test). Open yours and compare, fakes will have a small die covered in white silicone.

mastertech · 19th August 2005, 11:43 PM

Hi

I hope the ones i bought recently from Jaycar are originals
cause i plan to buy in wholesale quantities as well as for
prototyping

cheers

19th August 2005, 06:42 AM	#1
Peter1960 diyAudio Member Join Date: Aug 2005	TIP35C Failure Hi, We have been using TIP35C in our solid state amps for a few years now. In th past 6 months the failure rate of breakdown has gone up dramatically. Can anyone shed some light on this? Has anyone expienced the same? The circuit has not changed, and we had a unit come back after 6 years in use, with a minor resistor failure only. We still use the same supplier. Any thoughts welcome and appreciated. regards Peter

19th August 2005, 09:08 AM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Same supplier or same semiconductor manufacturer? __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

19th August 2005, 11:08 AM	#4
Workhorse diyAudio Member Join Date: Dec 2004	Hi Peter, We also face the same situation of failure rate once upon a while, though it was due to the changing of manufacturer of a compensation cap from on company to another... kindly check all the components in your circuit whom are subjected to change in manufacturing firm or suppliers... dont worry....but in my case i get upset very much..... K a n w a r __________________ It's a fruitless endeavor to try and educate a fool that rejoices in ignorance

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
TIP35C TIP36C for sale	Tom7227	Parts	0	4th October 2008 09:25 PM
Tip35C/Tip36C	Risto80	Car Audio	0	15th May 2007 09:53 AM
Lm3875 + Tip35c/tip36c	JojoD818	Chip Amps	31	29th December 2003 10:31 AM
An amp that uses Tip35c and Tip36c Transistors	Jemplayer	Solid State	1	10th June 2003 12:55 AM


	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

19th August 2005, 10:45 AM	#3
edl diyAudio Member Join Date: Oct 2004	Dear Peter! Maybe you receiving fake TIP35C's. For more info's chevk this page: http://www.sound.westhost.com/counterfeit.htm Regards (Anyway, I am courios about the schematic, shall we see it? Thanks!)

19th August 2005, 11:15 AM	#5
LukasLouw diyAudio Member Join Date: Sep 2002 Location: Colonia, NJ	I just ran into a batch of ST TIP35C/36C transistors in a client's amps that seem to be fake, Low gain, high saturation, and they blow for no apparent reason. Although Iv'e had good luck using the ST parts in clients' designs teh last 5 years or so, with several hundred thousand parts used, if not millions, in various models, and this is the first time Iv'e seen problems, so have to assume theyr'e fake. These are sourced in China by OEM factories there. For now wer'e switching over to ON Semi parts till teh ST part sourcing problem can be cleared up. Lukas

19th August 2005, 04:47 PM	#6
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	These pictures show genuine TIP35C and TIP36C from various sources. All them survived producing 180W@4 ohms with +-41V regulated rails and a single pair of output devices (quite though a test). Open yours and compare, fakes will have a small die covered in white silicone.

19th August 2005, 11:43 PM	#7
mastertech Banned Join Date: Mar 2005 Location: Australia	Hi I hope the ones i bought recently from Jaycar are originals cause i plan to buy in wholesale quantities as well as for prototyping cheers

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

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