MELF metal film is better than other SMD resistors?
A simple question for those who have more experience in audio projects.
A simple question for those who have more experience in audio projects.
they are magnetic, so maybe not compared to some of the high end non-magnetic thin films.
if you are designing yourself just use CMF over MELF, find the right size SMD pattern that will allow you to mount them with leads flat against the PCB
if you are designing yourself just use CMF over MELF, find the right size SMD pattern that will allow you to mount them with leads flat against the PCB
Susumu NRG and Vishay PNM, but very expensive and availability seems limited. Better off using CMF like I suggested above if you can, should be better unless you need absolute lowest inductance
Typically they have more material so benefit from reduced field-strengths in operation, enabling greater linearity (although all metal film are extremely linear anyway).
SMT resistors come in (at least) two kinds, metal film (called "thin film"), and metal-oxide (called "thick film"). Use thin film SMT resistors for where high linearity matters. Or MELF of course.
Being magnetic isn't an issue in signal circuits - it can matter for speaker outputs where many amps can flow and develop measurable non-linear back-EMFs from ferromagnetic materials. With a few mA this is not an issue.
"The main advantage of using MELF instead of standard SMD packages is the lower thermal coefficient and better stability."
They're also easier to find if tighter tolerances is required, like 1% or less.
They're also easier to find if tighter tolerances is required, like 1% or less.
Really? 0.1% SMT are readily available (in fact at Mouser the 1% outnumber the 0.1% by a factor of only 2 or so), and far more are available than MELF...
And if you are rich there are even some 0.01% SMT resistors with a tempco of 0.2 ppm/C
And if you are rich there are even some 0.01% SMT resistors with a tempco of 0.2 ppm/C