Ultra X2 X-Connect VS component question

[DixiePenguin]

Need help identifying this small component. On the thermal sensor PCB that controls the fans in the power supply, there are 3 small black plastic components. I cannot remember what they are called which makes replacing one difficult, in the bouts of "CRS" disease I guess.

They are 3/4 round sort of [), .5mm x .3mm. Component number is U1 on PCB. Markings are:

"H" TL
43T-C
639

I picked this up at a very good price because the p/s works, but fans only spin for a few seconds before stopping. This component appears to be the problem, it is cracked across the middle above the 43T-C and split on the casting seam vertically.

Thanks in advance.

[Toasty]

Re: Ultra X2 X-Connect VS component question

Likely it's actually: TL431C

Datasheet: http://pdf1.alldatasheet.com/datashe...PS/TL431C.html

http://search.digikey.com/scripts/Dk...=296-1290-2-ND

Toast

[DixiePenguin]

Re: Ultra X2 X-Connect VS component question

Many thanks, Toasty. Right you are, it is a "1" It was on the split so I couldn't see it ar first.

On my way to find the part now.

Bill

[Wizard]

Re: Ultra X2 X-Connect VS component question

Jelly bean micro amp regulator providing fixing voltage based on 2 precision resistors totem pole circuit for the feedback circuit.

Should not be more than 5 bucks. Can be tested in circuit with few volts across this circuit and get exact 2.5V if it works correctly.

Cheers, Wizard

[DixiePenguin]

Re: Ultra X2 X-Connect VS component question

So far the smallest quantity purchase I can find is 10 @ $12 plus shipping. Is there any source for smaller quantities that you folks could recommend. I could live with the $12 price I guess, Digikey sells only in multiples of 2000 @ $224. I will also check some of the junk power supplies I lying about.

Sta yu,
Bill

[etnietering]

Re: Ultra X2 X-Connect VS component question

Looks like you can get them by the 1's on Mouser for 14 cents each:
http://mouser.com/ProductDetail/Fair...aytbcjY9iFQ%3d
Looks like it's the right part. Good luck

[Toasty]

Re: Ultra X2 X-Connect VS component question

My bad. Chose the 2,000 min qty line. The singles are one above:

http://search.digikey.com/scripts/Dk...me=296-1290-ND

$0.40

Mouser shipping can be high vs. Digikey.

Toast

EDIT: BTW, device package is called TO-92

[DixiePenguin]

Re: Ultra X2 X-Connect VS component question

Well, ordered the part. I will let you know how it goes. Thanks for all the help and suggestions.

Bill

[DixiePenguin]

Re: Ultra X2 X-Connect VS component question

Well, installed the part, but I think there were other components bad as well. Still no power to the fans. I used a thermal sensor board salvaged from an Ultra 600W p/s instead. Same PCB, only difference was it had the overvolt protection components on the board which the 700W lacked. The thermal sensor part worked fine and I now have a nice 700W modular p/s. I will probably try reworking the entire original thermal PCB sometime this winter.

[Toasty]

Re: Ultra X2 X-Connect VS component question

Can you provide pics of the board? Top and bottom?

It's not -that- complicated a circuit.

Toast