That text you quoted is decades old. You once again proved yourself wrong on your claims that new resistors are a conspiracy. How long are you going to keep making yourself a laughing stock? I mean, the credibility you have left is basically zero. Keep wrapping more tinfoil and keep providing zero evidence.
Once again, I have zero problems using moden high power density resistors significantly over 50% rated power. Other professionals agree. No proof of otherwise, not a single bad experience by a professional who actually designed this stuff in has been shown. The burden of proof is on who makes the claim, and extraordinary claims require extraordinary evidence.
50% derating suggestions hide some assumptions (e.g. PCB orientation, possible blockage of cooling, how close multiple heat-generating parts are close together, etc.). It's a rule to ease thermal design for those who don't have time or energy to think about it. There is no need to follow such practice if you understand thermal design and can simulate or practically measure the performance.
Exactly as with all other component types, manufacturer cannot predict how the customer uses the part and tests how it performs in isolation. Just like you can drive faster when there is no other traffic, and thus cars have higher top speeds rated compared to what you actually can drive at.
Credibility, reputation- I'm not here for that malarkey. In electronics a person is constantly wrong and only has more to learn.
Engineers that know it all and have a lot of ego crash and burn in the best ways. This is where you and I differ.
You've provided no formulas, calculations, datasheets, app notes, tech papers, URL's towards helping the thread, aside from urine.
Piss on me, piss on the thread but at least offer guidance for OP and the beginners here, or GTFO.
I see no way to
reach out to Yageo to ask why they omit heat rise data for some of their acquired brands. FMP, PNP. So that OP would understand being ripped off.
I compared data on 65 different resistor makes/models including temp rise and physical (body) size, lead diameter etc. to see the game.
It's the 1/4-sized parts that I have issue with, as well as their deceptive datasheets.
Industrial products I design to 60°C ambient so a practical ball park dissipation number
Yageo Vitrohm
POS series the 1/4W-body rated P
70 1W is 130K/W and +200°C max. (which is more typical for wirewound).
Using 130K/W people here can do a little math and get a rosy estimate.