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bedrock-rnd [bedrock-rnd logo]

bedrock-rnd parametric footprint

Input

  • draw grid in mm
  • draw in "mask and paste"

Result

Footprint attribute:
qfn-rfp(density=B, N=16, BS=3, PP=0.5, PW=0.3, PL=0.75, PRP=2.95, CPL=1.55~1.8, CPW=1.55~1.8)

Download footprint file

 

Documentation

qfn-rfp(density=B, N=16, BS=3, PP=0.5, PW=0.3, PL=0.75, PRP=2.95, CPL=1.55~1.8, CPW=1.55~1.8)

square flat no-lead (qfn)

Generate a square flat no-lead footprint mainly from recommended footprint (copper pad) drawing, optionally also using component drawing for silk, assembly and courtyard layers



qfn-rfp parameters

Ordered list (positions): N,NL,NW,PW,PL,BS,BL,BW,PP,PT,PC,PRP,PRPL,PRPW,PGL,PGW,CPL,CPW,CYE

name man
dat
ory		description value (bold: default)
N   number of leads in square case  
NL   number of leads on one side along the length of the package in rectangular case  
NW   number of leads on one side along the width of the package in rectangular case  
PP yes nominal pitch (distance between centerline of adjacent leads in a row) Dimension: a number with an optional unit (mm or mil, default is mil)
PW yes pad width Dimension: a number with an optional unit (mm or mil, default is mil)
PL yes pad length Dimension: a number with an optional unit (mm or mil, default is mil)
BS   plastic body size (with tolernace); in case of square body  
BL   plastic body length (vertical; with tolernace); in case of rectangular body  
BW   plastic body width (horizontal; with tolernace); in case of rectangular body  
CPL yes center pad length (same direction as BL); 0 or empty if no exposed center pad Dimension: a number with an optional unit (mm or mil, default is mil)
CPW yes center pad width (same direction as BW); 0 or empty if no exposed center pad Dimension: a number with an optional unit (mm or mil, default is mil)
PE   pin extent (with tolernace)  
PT   pin thickness (with tolernace); really the width of the lead  
PC   pin contact length (with tolernace); specify either this or PG  
PRP   pad row pitch: distance between center of pads of the two rows (square body) Dimension: a number with an optional unit (mm or mil, default is mil)
PRPL   pad row pitch: distance between center of pads of the two rows across length (rectangular body, vertical size) Dimension: a number with an optional unit (mm or mil, default is mil)
PRPW   pad row pitch: distance between center of pads of the two rows across width (rectangular body, horizontal size) Dimension: a number with an optional unit (mm or mil, default is mil)
PGL   pin gap along body length (vertical; with tolernace); specify either this or PC  
PGW   pin gap along body width (horizontal; with tolernace); specify either this or PC  
datasheet   url to the datasheet dimensions are coming from  
CPVP yes center pad via grid pitch (distance between vias); 0 or empty for no vias Dimension: a number with an optional unit (mm or mil, default is mil)
CPVHD yes center pad via hole diameter Dimension: a number with an optional unit (mm or mil, default is mil)
CPVCD yes center pad via copper diameter Dimension: a number with an optional unit (mm or mil, default is mil)
CPPAT yes center pad pattern type
none no pattern, round corner rectangle slightly smaller than the pad
chamfer small segments with chamfer corners that avoid vias
nopaste no paste at all
CPPG yes center pad pattern gap; nominal distance between pattern elements Dimension: a number with an optional unit (mm or mil, default is mil)
F yes fab tolerance in +-mm  
P yes part placement tolerance in +-mm  
silk_thickness yes thickness of silk graphic lines; diametr of pin 1 dot is calculated from this too  
mask_offs yes gap between copper pad edge and mask cutout edge  
glue_thick yes default line thickness for glue on adhesive layers; if 0 omit the layer  
glue_dots yes print dots instead of lines for glue when non-zero  
pad_rounding   rectangular pad corner rounding radius (0 for sharp corners) Dimension: a number with an optional unit (mm or mil, default is mil)