What is this part.....

[PlainBill]

Re: What is this part.....

In an early post someone suggested a replacement "Inrush current limiter" but the suggested replacement i think has a resistance of 12ohm........i measured ~ 9ohms on the one that i want to replace.

So it got me to thinking ..........what do i need.

The marking (see original pic) is SCK083



This web site has sck type products but to be honest i am not sure what i need. I would like to order something from digikey if possible. Any ideas?

I'm going to make a SWAG that the number on the part shows the critical, non-obvious information. There is no point in putting the diameter on the part - that can be readily measured. The 08 could indicate the cold resistance - 8 ohms, while the 3 indicates the current at 25°C - 0.3 A. They don't seem to spec the maximum current. but I would expect the monitor to pull something under 100 watts, so let's say 1 Amp.

The closest match at Digikey would be 317-1149-ND. Or you could try using one from an unrepairable monitor.

PlainBill

[Welchs101]

Re: What is this part.....

Hi Bill,

Using this link .......i thought the resistance was 30ohms.......



Resistane / Max Cur. / ~ R of Max cur. / Dis. Coef. / Thermal Constant
30 / 1 / 1.022 / 11 / 30 for the MF72-30D9
8 / 1 / 0.539 / 9 / 28 for the MF72-8D7

Now i could be wrong .......totally wrong. The link might not be right.....

What do you think?

[PlainBill]

Re: What is this part.....

Hi Bill,

Using this link .......i thought the resistance was 30ohms.......



Resistane / Max Cur. / ~ R of Max cur. / Dis. Coef. / Thermal Constant
30 / 1 / 1.022 / 11 / 30 for the MF72-30D9
8 / 1 / 0.539 / 9 / 28 for the MF72-8D7

Now i could be wrong .......totally wrong. The link might not be right.....

What do you think?

I don't know. The problem is they use the SCK series identifier and a 3 digit code. Nowhere do the correlate the 3 digit code to a part number.

I just looked at a couple of 19" monitors I have here. The maximum current on one is .9A, on the other it's 1.5A. That calls for a maximum current of at least two amps.

DUH!!! Email them and ask them to explain how SCK 083 correlates to the maximum current and no load resistance.

PlainBill

[Welchs101]

Re: What is this part.....

I just did........i will let you know what they say.

[Welchs101]

Re: What is this part.....

ok...never got a response from them.

But i did a little checking again and i am glad i did.

The SCK083 .....the resistance is not 30ohms.

Ok let me start over........originally i had found this link


From the above link i thought the Resistance was 30hms. But then i found another link which i tend to believe more.


Here the resistance is 8ohms. Recall that when i physically measure the device i get 9ohms.

Ok so my question is i have a replacement bridge rectifier and the only SCK i have is SCK035 which measures about 4.7ohms. Can i use the SCK035 instead of the SC083?

Using the SCK035 will not cause a problem will it?

[Welchs101]

Re: What is this part.....

i copied the data from the spec see enclosed pic.........

[Welchs101]

Re: What is this part.....

Just wondering if i use SCK035 (since i dont have a SCK083) ....does anyone see any problems with this.

This thermistor came out of a power supply from an LCD monitor.

[PlainBill]

Re: What is this part.....

Just wondering if i use SCK035 (since i dont have a SCK083) ....does anyone see any problems with this.

This thermistor came out of a power supply from an LCD monitor.

As long as the monitor has roughly the same power rating and the bridge has the same current rating, I wouldn't worry.

PlainBill

[Welchs101]

Re: What is this part.....

Hi Bill,

thanks. wanted to update you.

I put the other thermistor in and when i went to put in the spare bridge rectifier (replacement from another unit) the leads on the recitifier were too large so i cant use it.........

guess i will just have to order a replacement rectifier.

thanks for your hellp.

[Toasty]

Re: What is this part.....

Don't be overly concerned with the cold resistance of the NTC thermistor. It drops to zero nearly instantly as the unit comes on. As long is of the same or higher power rating or from a similar unit you'll be fine.

Use a fine drill bit and open the holes to accept the bridge rectifier leads.

[Welchs101]

Re: What is this part.....

Hi,

I am going to order a new bridge rectifier.

Someone had suggested i use this one

http://search.digikey.com/scripts/Dk...%2F51&x=29&y=9


But since i am going to "piggy-back" on a order that my friend is placing and they are using Newark not digikey (i usually use digikey) that part that was recommended above is available through newark but you have to order 600 at time. I found this one on newark...........would it be ok

http://www.newark.com/multicomp/kbl4...83?Ntt=01P3583

Recall the orginal part i am replacing D2SB....which is i think (based on inputs from badcaps forum) a 1.5A 600V.

[Welchs101]

Re: What is this part.....

Just wanted to double check before i buy

http://www.newark.com/multicomp/kbl...583?Ntt=01P3583


would the above rectifier be ok?

[PlainBill]

Re: What is this part.....

Just wanted to double check before i buy

http://www.newark.com/multicomp/kbl...583?Ntt=01P3583


would the above rectifier be ok?

At this point you should be able to answer the question yourself.
1. Will it fit?
2. Is the voltage rating high enough?
3. Is the current rating high enough?

PlainBill

[Welchs101]

Re: What is this part.....

hi Bill,

I compared a few parameters like
1) If
2) VRRm
3) VRMS
4) VF
5) typical thermal resistance

and they are the same for both for the above parameters.

Whats different between the two:
IR: DIgikey part: IR = 5uA to 1mA, Newark part: 10uA to 500uA
Operating temp: Max for digikey part is 150C, Newark part is 125C


what i was not sure of is are these differences significant enough not to get the newark part. I think its not that significant but just wanted to be sure.

[PlainBill]

Re: What is this part.....

hi Bill,

I compared a few parameters like
1) If
2) VRRm
3) VRMS
4) VF
5) typical thermal resistance

and they are the same for both for the above parameters.

Whats different between the two:
IR: DIgikey part: IR = 5uA to 1mA, Newark part: 10uA to 500uA
Operating temp: Max for digikey part is 150C, Newark part is 125C


what i was not sure of is are these differences significant enough not to get the newark part. I think its not that significant but just wanted to be sure.

IR is reverse current; lower is better, so the Newark part is better. You do realise the boiling point of water is 100°C, right? If your monitor ever got to 125 °C, you'd have more problems that the bridge failing.

PlainBill

[Welchs101]

Re: What is this part.....

ok....i think i get your meaning.

thanks!