Least Use Environment And Least Material Condition

[ltrakal]

Why when I open the chip resistors I have two libraries: LEAST USE ENVIRONMENT AND LEAST MATERIAL CONDITION, one is saved as IPC and the other not, what should I use and why these diferent names?
And thanks again for your answers.

Laszlo

[ltrakal]

I'm sorry I posted in the wrong place.

[randychase]

No worries, I can move it.

[ltrakal]

hi Randy can you tell me what those diferneces are please?

thanks a lot

[randychase]

I am not sure. Are these referring to the libraries in PCBstandards?

I think I understand what LEAST MATERIAL is, but it is normally relative to MAX MATERIAL. In other words, the smallest or largest a part could be. This would be similar to the 3 tier system we use, where you would use the LEAST MATERIAL one for tighter designs.

I think.

But your two libraries seem to refer to the same thing. LEAST USE would seem to be a part that you would not use in a nominal requirement.

???

[ltrakal]

try to open this two libraries and you will see the diferenc:
L_RESC_IPC.pdf and L_RESC.pdf.

Thanks