document updated 18 years ago, on Apr 5, 2006

1000 mil = 1 inch
1 mil = 25.4 microns
1mm = 39.4 mil

Pkg	Pin spacing	Width	Pin count	Mount
DIP	100 mil	300 or 600 mil	8 .. 44, every 2n	through-hole
SOT-223	90 mil	140 mil	4	SMT
SOIC	50 mil	150 - 520 mil	8 .. 44, every 2n	SMT
PLCC	50 mil	350 - 1150 mil	20 - 84	SMT
SSOP	25 mil	150 or 209 mil	8 .. 28, every 2n	SMT
-	50 mil	300 mil	48, 56	SMT
TSOP	20 mil	464 - 724 mil	20 .. 48	SMT
TSSOP	25 mil			SMT
PQFP	25 - 39 mil			SMT

Notes:

"pin spacing" is normally refered to as "Lead Pitch"
"width" is the distance from the center of each row of pins
Aww, how cute, they have test clips for just about everything, so doing in-circuit programming may work no matter the board size?