ocdb/utils/land-protrusions
ocdb/utils/land-protrusions
is a set of lookup tables used to satisfy IPC compliance during the generation of land patterns. It defines a set of LandProtrusionType
s that represent metadata about package leads or terminations that is used alongside DensityLevel
in order to compute offsets to the pads and courtyards of land patterns.
Data Types
public pcb-enum ocdb/utils/land-protrusions/LandProtrusionType :
SmallFlatRibbonLLeads, ; Flat ribbon L leads for pitch less than 0.0625mm
SmallGullWingLeads, ; Gull wwing leads with pitch less than 0.0625mm
BigFlatRibbonLLeads, ; Flat ribbon L leads for pitch greater than 0.0625mm
BigGullWingLeads, ; GullWing leads for pitch greater than 0.0625mm
JLeads, ; J Leads
SmallRectangularLeads, ; Leads for rectangular components (chip capacitors, resistors, inductors) smaller than 0601
BigRectangularLeads, ; Leads for rectangular components (chip capacitors, resistors, inductors) 0601 or larger
CylindricalLeads, ; Cylindrical end cap leads
LeadlessChipCarrierLeads, ; Lead less chip carrier leads
ConcaveChipArrayLeads, ; Concave chip array leads
ConvexChipArrayLeads, ; Convex chip array leads
FlatChipArrayLeads, ; Flat chip array leads
ButtJointLeads, ; Butt joint leads
InwardFlatRibbonLLeads, ; Inward flat ribbons L leads
FlatLugLeads, ; flat lug leads
QuadFlatNoLeads, ; quad flat components without leads
SmallOutlineNoLeads, ; small outline packages without leads
SmallOutlineFlatLeads, ; small outline flat leads
ShortTwoPinCrystalLeads, ; two pin crystal components shorter than 10mm
ShortAluminumElectrolyticLeads, ; electrolytic capacitor shorter than 10mm
TallTwoPinCrystalLeads, ; two pin crystal components 10mm or taller
TallAluminumElectrolyticLeads, ; electrolytic capacitor 10mm or taller
LandProtrusionType
is a helper enum for various kinds of leads and terminations on components. It is used to configure their generated land patterns.
public pcb-struct ocdb/utils/land-protrusions/LeadFillets:
toe:Double ; space away from the component towards the board
heel:Double ; space towards the component
side:Double ; space on the edges of the lead
courtyard-excess:Double ; additional area to add to the courtyard
LeadFillets
is a helper struct that represents the space added to pads and courtyard area when generating land patterns.
Functions
public defn lead-fillets (lead-type:LandProtrusionType) -> LeadFillets
public defn lead-fillets (lead-type:LandProtrusionType, density-level:DensityLevel) -> LeadFfillets
A helper function to lookup the LeadFillets
corresponding to a LandProtrusionType
given a DensityLevel
. If not supplied, the DensityLevel
used is the default defined in Design Variables
public defn bga-courtyard-excess (density-level:DensityLevel) -> Double
A helper function to lookup the courtyard excess when computing BGA land patterns.