I am wondering what are pros & cons of miniature resistors, I have seen that there are 1/2 watt resisors that have a quite smaller body than the usual 8-9mm length and around 3,5mm diameter.
ok that's some good points, but what are then some specific use in practice requiring miniatures, in which kind of applications would miniature resistors be used in, is it more an industrial use? so maybe miniatures are not so much preferable in analog audio I assume?
I have been using Philips/Vishay sfr16s since the 90s for compact 10kh ecl designs, but now use them in some power amp designs
Industrial is all surface mount unless high power is required. No idea where those
miniature through hole parts would be used these days.
miniature through hole parts would be used these days.
See post 19 of this thread about the limitation of 500 mw metal film resistors, compared to 1960's 1/2 watt carbon comp resistors. https://www.diyaudio.com/community/threads/dynaco-sca80q-issues.383233/#post-6995472
Poster installed an "upgrade" board to a 1970 piece of equipment, kept blowing a 1/2 watt resistor. Board was compatible with 1970 carbon comp resistor but had too much surge current for a modern 1/2 watt metal film resistor.
Poster installed an "upgrade" board to a 1970 piece of equipment, kept blowing a 1/2 watt resistor. Board was compatible with 1970 carbon comp resistor but had too much surge current for a modern 1/2 watt metal film resistor.
Standard resistors are 1/2W (or 1/3W, 0.4W, etc) and have 6mm long bodies, 10mm hole-spacing. Bigger than that is a "large" resistor, smaller (like 1/8W, 7.5mm hole-spacing) are termed "miniature" (they are dying out as SMT has taken their place).
This size (1/2W) was used is almost everything that doesn't have high voltage or high power requirements as they are much cheaper, but of course SMT has taken over.
You pick the size required for the power and voltage requirements. If you are mainly needing 1W types, you might as well stick to all 1W, if only to consolidate the BoM. BTW never run a device at its full rated power if you want reliability - always derate.
1/2W metal film are absolutely fine (stellar performance IF you don't overload them - that 1/2W is a strict upper limit, and conditional on suitable lead-length, convective air-flow etc etc).
Carbon comp may well have a high transient power rating, that's something to look out for in certain applications, but they are pretty awful in all other respects (like drifting in value by >30% over time, being very noisy, that sort of nonsense).
ok maybe it can be seen in different ways what is classified as miniature resistor, however I was thinking of two different resistor models both about half Watt rating but one is smaller in size.
For example Yaego MFR series resistors have two different 0.5 Watt models, MFR50 is called "normal" and is 9 x 3.3 mm, the smaller MFR50S is called "miniature" and is 6.3 x 2.4 mm, this is from Yaego FMR series datasheet, they have other Watt ratings of both normal and miniature size.
I wonder how come they have different size for sama Watt rating, it had me wonder what really is the pros or cons for a smaller size same Watt rating, except for the smaller size taking up less physical space, they seem to be made with same materials?
For example Yaego MFR series resistors have two different 0.5 Watt models, MFR50 is called "normal" and is 9 x 3.3 mm, the smaller MFR50S is called "miniature" and is 6.3 x 2.4 mm, this is from Yaego FMR series datasheet, they have other Watt ratings of both normal and miniature size.
I wonder how come they have different size for sama Watt rating, it had me wonder what really is the pros or cons for a smaller size same Watt rating, except for the smaller size taking up less physical space, they seem to be made with same materials?
