resistor rating question.

[gogofast]

over the years, i've bought many drawers full of resistors in bulk practically for nothing. mostly smaller ones 1/8 or 1/4 watt. i'm trying to see if i can use them in diy amps and such.... i got a data sheet for dale resistor i seem to have most values i need, but little confused about the data sheet.

they're RN55C 1% resistors. are these 1/4W rated resistors? what's with "power rating" which says 1/10W @125C? under "size" it says 1/4W....is there an error in this chart?

would appreciate any help.

http://www.irctt.com/pdf_files/rn.pdf

 

[avionic]

over the years, i've bought many drawers full of resistors in bulk practically for nothing. mostly smaller ones 1/8 or 1/4 watt. i'm trying to see if i can use them in diy amps and such.... i got a data sheet for dale resistor i seem to have most values i need, but little confused about the data sheet.

they're RN55C 1% resistors. are these 1/4W rated resistors? what's with "power rating" which says 1/10W @125C? under "size" it says 1/4W....is there an error in this chart?

would appreciate any help.

http://www.irctt.com/pdf_files/rn.pdf

At 125 degrees C they will only handle 1/10 of a watt. Thats 257 degrees F.
There rated at .25 watts otherwise.

Thats 257 degrees F.

Don't use them in your oven..Or on the planet Mercury..:thmbsp:

 

[gogofast]

At 125 degrees C they will only handle 1/10 of a watt. Thats 257 degrees F.
There rated at .25 watts otherwise.

thanks for the help.

on the second page towards the bottom, there's "ordering data" that explains how to read the code on the resistor.
according to that, RN55 is actually "fixed film" 1/10W resistor. code "55" is 1/10W looks like. but on the top of the data sheet, it says "RN series - 1/8W to 1/2W". really confusing....

so bottom line, i guess, is, can i use this where the circuit calls for 1/4W resistors? maybe not in a high voltage 100% tube circuit, right? but how about low voltage hybrid design such as headphone amps?

 

[whoaru99]

I was confused too...I read something about the 1/10 watt having something to do with an uber-conservative mil-spec rating or something like that.

 

[gogofast]

I was confused too...I read something about the 1/10 watt having something to do with an uber-conservative mil-spec rating or something like that.

so this is a military secret stuff?

for cryin' out loud, why can't they just stamp 1/4w or 1/8w.

if these are indeed 1/10w rated, what the heck am i to use these for? maybe diy battery powered led tree.....

 

[westend]

At 125 c. the RN55c is rated at 1/10 w.. At 0 c., it would be 1/4 w..

 

[gogofast]

At 125 c. the RN55c is rated at 1/10 w.. At 0 c., it would be 1/4 w..

wonder why 125c... is this made for specific purpose? anyone know what i can do with these?