I have read various questions and posts, but still I am not sure whether when talking about resistors, thin film means the same as metal film or not.
I read the statement that "most of the metal film resistors are thin film". That means that there are also metal thick film resistors. But does it also mean, that a thin film resistor is always a metal film type?
To give an example: Are those resistors from Yageo (http://www.yageo.com/NewPortal/yageodocoutput?fileName=/pdf/R-Chip/PYu-RT_1-to-0.01_RoHS_L_9.pdf) metal film resistors?
The "resistive" layer is not specified further in the datasheet, but since the Yageo website talks about "sputtering" I assume it´s metal film?
EDIT: From the comments it seems that "thin film" and "metal film" is often used as a synonym. This seems to be the case because metal film resistors are produced by thin film techniques. Open question seems to be therefore: What is the difference of through-hole(i.e. leaded) metal flm resistors and thin film smt resistors (beside of power and voltage rating)? Is (in general) a leaded metal film resistor comparable to a thin film smt resistor with regard to noise? If not why not if the process (thin film) and the materials are the same?
//Update 2020_12_31: TO close the question with the outcome from the omments/discussions. Thin-film resistor are simply one sub-category of metal-film resistors.