BOM issues

[str4d]

I am attempting to make the BOM compatible with the automated scanner for PCB Train, and am documenting the issues I encounter. I'll make a PR to address them once I get a working BOM.

• Their scanner wants separate "Manufacturer" and "Manufacturer Part Number" columns, and passing the "Device" column (which contains both for some parts) as the latter gives fewer matching results than splitting it into two columns.
• R12, R17, R18, R20, R21, R22, R24, R25 has eight Designators, but only "Quantity: 7".
• R12, R17, R18, R20, R21, R22, R24, R25 say they are an 0402 resistor in the "Device" column, but an 0603 resistor in the "Description" column.
• R3, R14 say they are an 0603 resistor in the "Device" column, but an 0402 resistor in the "Description" column.
• C9, C17 say they are rated to 10V in the "Device" column, but to 16V in the "Description" column.
• Littelfuse part numbers don't appear to match the manufacturer website. OMNI-BLOK 154010.0 and 154005.0 are the Littelfuse catalogue numbers, but per the 154 datasheet's part numbering system, these should instead use 0154010.DR and 0154005.DR to indicate that they are the "Very Fast-Acting (FF)" fuse type (instead of 0154005.DRT or 0154005.DRTL, which are "Slo-Blo/Time Lag (T)/Time Delay" fuses; the automated scanner selected 0154005.DRT initially).
• It would be helpful to provide example manufacturers for the standard parts, so that the automated scanners can figure out what they are (and maybe suggest alternatives, IDK if they do).
  • For instance, PCB Train provides a Free Components list, for which they use NEL part numbers.

[str4d]

Measuring between the middle of pads on the Gerber files, I see:

• R10, R11: 1.6mm
• R3, R14: 1.6mm
• R12, R22: 1mm

The BOM consistently lists R10 and R11 as an 0603 package, and 1.6mm is the length of an imperial 0603 package (vs a metric 0603 which would be 0.6mm). Assuming all resistors are using imperial package numbers, that means the "Device" column in the BOM is correct (and the "Description" column is incorrect): R3, R14 are 0603, and R12 etc. are 0402.

[str4d]

When I search Digi-Key, the only 22uF 0805 X7R Ceramic Capacitor that comes up is GRM21BZ71A226ME15L, which is rated to 10V. Given that the "Device" column was correct for the resistor BOM errors, I'm going to presume it is correct for C9, C17 as well. They are described as "+5V Internal Decoupling caps", and you usually want 2-3x the target voltage to allow for spikes, so 10V should be fine.

[ints99]

Btw, R22 seems to be 2K2 on schematics, but 10K on BOM. I hope, 10K will actually work as well, as I soldered it already in place before noticing the difference...?