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Old 19th August 2005, 06:42 AM   #1
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Unhappy 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
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Old 19th August 2005, 09:08 AM   #2
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Same supplier or same semiconductor manufacturer?
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www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more.
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Old 19th August 2005, 10:45 AM   #3
edl is offline edl  Hungary
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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!)
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Old 19th August 2005, 11:08 AM   #4
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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
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Old 19th August 2005, 11:15 AM   #5
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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
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Old 19th August 2005, 04:47 PM   #6
Eva is offline Eva  Spain
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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.

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Old 19th August 2005, 11:43 PM   #7
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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
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