Precision metal film resistors

[Andre Majorel]

What is the difference between 0.1% and 1% metal film resistors ?
Are the higher precision parts made from a different process ?
Or cherry picked from a big batch of 1% ? Just curious.

 

[Peter A Forbes]

What is the difference between 0.1% and 1% metal film resistors ?
Are the higher precision parts made from a different process ?
Or cherry picked from a big batch of 1% ? Just curious.

Different process looking at some here. They are physically different in
construction and finish.

We use 1% or 2% MFR generally, having ditched CFR a few years back. We have a
few stock 1% for special needs.

Peter

 

[Mook Johnson]

What is the difference between 0.1% and 1% metal film resistors ?
Are the higher precision parts made from a different process ?
Or cherry picked from a big batch of 1% ? Just curious.

I think most are laser etch trimmed to .1%.

 

[Spehro Pefhany]

What is the difference between 0.1% and 1% metal film resistors ?
Are the higher precision parts made from a different process ?
Or cherry picked from a big batch of 1% ? Just curious.

Different process, at least in most cases. Compare tempco, load life
and other stability figures to see. A 1% resistor that happens to be
within 0.1% will usually not have the stability that many designers
are looking for.


Best regards,
Spehro Pefhany

 

[Andre Majorel]

Different process, at least in most cases. Compare tempco, load life
and other stability figures to see. A 1% resistor that happens to be
within 0.1% will usually not have the stability that many designers
are looking for.

Thanks everyone that was informative. I had noticed the lower
tempcos but not the other parameters.