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In Reply to: RE: Ask Vishay, sounds like marketing speak to me posted by CG on January 02, 2020 at 04:09:58
A nice app note but it would be a huge stretch for Vishay to extrapolate that to their leaded metal film resistors or for the casual reader to make that assumption.
13DoW
Follow Ups:
Inductance and capacitance effects are somehow different with leaded parts?That's a new one on me.
Now quitting before I shame myself further. A fitting end to my online commenting.
Best wishes to all in the New Year and for years to come.
Edits: 01/02/20
Yes, there is a big difference. Look at the info on the SM parts. See how much better the tiny 0201 part performs at high frequencies compared to the 0402 or 0603? A 1/4 watt leaded part is is at least 12 times longer, 10 times the width, and then you add lead inductance. Yes, there is a big difference. That said, a 1/4 watt leaded part will still be fine up to at least 100MHz. Not a concern for audio.
Very roughly each mm of wire has a self inductance of 1nH. So, a leaded resistor with a 10mm long connection at each end will have 20nH minimum. The app note you linked shows the equivalent inductance for surface mount resistors to be 0.1 - 0.2nH. Not a relevant difference for audio but definitely relevant at RF.
13DoW
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