Exploded transistor

[tom66]

Re: Exploded transistor

2sc945 is not the same spec as c945.

Generally when a transistor part is <letter> + <3 digits> it is a Japanese-style part number beginning with "2S".

[SteveNielsen]

Re: Exploded transistor

2sc945 is not the same spec as c945.

[TechGeek]

Re: Exploded transistor

Did that thing get 400VDC to it? Something rated for 5.2V or 6.3V gets 400VDC to it, it's probably going to explode, like that transistor.

[stj]

Re: Exploded transistor

2sc945

[SteveNielsen]

Re: Exploded transistor

General purpose NPN. Here's the basic data sheet for it.

I'd check the other parts around/connected to it.

[jasonbay13]

Re: Exploded transistor

well, it gets stranger. i had 2 psus that did nothing at all when plugged in. one had a blown transistor and another (one of the bigger ones) which i couldnt get number from.

the other has only 1 exploded transistor which i'm gonna replace, along with the bad caps and hope it works.

its a c945, any cross-reference on this i might be able to salvage from my other boards?

[SteveNielsen]

Re: Exploded transistor

I've seen a couple of them go like that. I've seen an IC with a chunk blown out too. It's kind of rare.

[eccerr0r]

Re: Exploded transistor

Usually transistors don't die/explode unless something else caused it to explode. Quite possibly the bulged caps caused its demise. My guess is that this transistor was part of the 5VSB circuitry, but yes having a picture of the board would be helpful to debug.

Of the overstressed transistors I've had, most just burned a hole through the case but with the heat involved, cracking like that isn't out of the realm of possibility at all.

[stj]

Re: Exploded transistor

foto's of the board?
someone may have one to get the part number.

[jasonbay13]

i have a 500w psu that died on me a few years ago. still had it around so i decided to open it up and see if it could be fixed. 1 bulged cap, others way high on esr. and i've never seen this before; an exploded transistor.
http://pontoppidan.info/lars/repairs...ed_2sc1318.jpg

like the one in the picture, but top half. if i can find a replacement transistor and caps think it will start working again? and have you ever had an exploded transistor?