jgsewell / oem_preferred_parts

Library for Kicad

OEM_Preferred_Parts

KiCad library employed by Olin Electric Motorsports electrical team.

Guidelines

1. General symbol naming guidelines

   • Fields that must be included (Example for STM32F439BI)

     • Reference (e.g., U)
     • Value (e.g., STM32F439BI)
     • Footprint (e.g., Housings_QFP:LQFP-208_28x28mm_Pitch0.5mm)
     • Datasheet (e.g., https://www.st.com/content/ccc/resource/technical/document/datasheet/fd/8c/0a/19/13/8f/41/99/DM00077036.pdf/files/DM00077036.pdf/jcr:content/translations/en.DM00077036.pdf)
     • MFN, or Manufacturer Name (e.g., ST)
     • MPN, or Manufacturer Part Number (e.g., STM32F439BIT6)
     • PurchasingLink (e.g, https://www.digikey.com/product-detail/en/stmicroelectronics/STM32F439BIT6/497-17468-ND/5268309)

   • Library naming should not be duplicated in footprint name

   • If symbol with same name exists for multiple manufacturers, the manufacturer name is written first

   • Specific manufacturer name (for atomic parts)

   • Type of symbol (for generic parts)

   • May be shortened for common components (e.g. Conn for Connector)

   • Reference designator may be substituted for common components (e.g. D, C, LED)

   • Part name should include extension for specific footprint if required (e.g. SOIC)

   • Any modification of the original symbol, indicated by appending the reason (e.g. different pin ordering - Q_NPN_CBE, Q_NPN_BCE)

   • Indicate quantity of elements for symbol arrays (e.g. resistor array with 8 elements - Resistor_x8)

2. General footprint naming guidelines

   Each footprint is a .kicad_mod file (stored within a .pretty directory). The naming convention for a given footprint depends largely on the type of footprint, however a general guide is presented below:

   • Specific package type is written first, e.g.

     • QFN - Quad Flat No-Lead package

     • C - Capacitor

   • Package name and number of pins are separated by a hyphen

     • TO-90

     • QFN-48

     • DIP-20

   • Unique fields (parameters) in the footprint name are separated by _ character.

   • Package dimensions are specified as length x width (and optionally height)

     • 3.5x3.5x0.2mm

     • 1x1in

     • If necessary for clarity, footprint body dimensions may be prefixed with a leading B

   • Pin layout

     • 1x10

     • 2x15

   • Pitch is specified with a leading P:

     • P1.27mm - 1.27mm pitch

     • P5.0mm - 5.0mm pitch

   • Modifiers to standard footprint values (Required only when there is a modification)

     • Drill1.25mm

     • Pad2.4x5.2mm

   • Orientation e.g. Horizontal, Vertical

   • Any modification to the original footprint, indicated by appending the reason

     • _HandSoldering

     • _ThermalVias

   • Examples from the library.

     • LQFP-208_28x28mm_P0.5mm
     • DFN-6-1EP_2x2mm_P0.5mm
     • Samtec_LSHM-110-xx.x-x-DV-S_2x10-1SH_P0.50mm_Vertical
     • Molex_PicoBlade_53261-0271_1x02-1MP_P1.25mm_Horizontal

   • You can find some of the standard footprints already made here.

Guidelines are based off KiCad Library Convention.