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enter image description hereDoes anyone know what a 201-1 package size is, and how it might differ from a 'normal' 0201?

I found it in a MacBook schematic.

Thanks in advance for your help.

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  • \$\begingroup\$ With how stingy Apple is, where on earth did you find that schematic‽ \$\endgroup\$ – Hearth Feb 2 at 20:00
  • \$\begingroup\$ Considering Apple it's probably a proprietary footprint. \$\endgroup\$ – DerStrom8 Feb 2 at 20:02
  • \$\begingroup\$ A long time searching and collecting! You need some? \$\endgroup\$ – Mal Feb 2 at 20:02
  • \$\begingroup\$ Could you post a picture of the spot you found it in? \$\endgroup\$ – JRE Feb 2 at 20:11
  • \$\begingroup\$ @Mal No, I was just surprised. I'd encourage archiving it though! Maybe send a copy off to archive.org, because we both know Apple won't. \$\endgroup\$ – Hearth Feb 2 at 20:11
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The case size is standardized by the case numbers in mil as 0201 but the pad designs for the layout may different depending on IR reflow or glue and wave-solder to optimize solder low defect rates from surface tensions.

So the -1 is used for both the 0201 and 0402 parts which must use the same solder process and optimized pad geometry as recommended by IPC standards, as @Derstrom has reported on. Although each company may choose deviations to IPC suggested by their partner CME assy shop to reduce costs associated with solder failures, the #1 test process failure. It is not just a just process failure but a design failure that must be collaborated with solder types preferred.

I know Apple likes to use no-clean flux process because it saves them a buck, so they can sell more Apple products which void some warranties with the moisture detection indicators, because contrary to myth, no-clean flux is quite corrosive with moisture and will corrode a moist Mac or iPad in a couple days. I’ve been burnt a couple times.

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  • \$\begingroup\$ Not sure about corrosion (and I sure it is not), but residues of some "no-clean" water-soluble fluxes can create shorts bdtween closely-spaced pins with below 1 k impedance in a bad rainy day, which will kill SMOS functionality for certain. \$\endgroup\$ – Ale..chenski Feb 3 at 4:31
  • \$\begingroup\$ I am sure about the blue-green copper rust I found after my experiences with apple. \$\endgroup\$ – Sunnyskyguy EE75 Feb 3 at 4:44
  • \$\begingroup\$ Metal oxides or rust are conductive , I agree and the moisture with that flux is deadly on exposed copper unlike resin types. The slight acidic nature of no clean flux makes it better for mass production soldering but worse for extreme. Humid environments with fan cooling and dust entrapment. \$\endgroup\$ – Sunnyskyguy EE75 Feb 3 at 14:37

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