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标题: 关于新版PADS系统自带库的问题. [打印本页]
作者: wwdzaefd    时间: 2012-5-26 09:08
标题: 关于新版PADS系统自带库的问题.
今天安装了PADS9.4.1发现系统自带了不少7251 7351元器件库,但是发现
; t8 e5 m; C1 u( P. X( ` CNA7251,CNB7251,CNC7251,CNP7251,,,
7 _# L! A, b( R: A  C) C  THA7351,THB7351,THC7351,THP7351,,,
3 _. G  q$ _2 }& y& x( a$ s0 S不知道这些A,B,C,P代表什么意思,. f! ~4 ^' b) H6 c  {8 r
知道的大侠指点下吧!
作者: wwdzaefd    时间: 2012-5-26 09:48
百度了一下找到了答案,谢谢"白山黑水",以下是从"白山黑水"新浪博客复制过来的,给有同样需要的人.
) Y& v: p! G: }7 I2 sI'm looking for description about these libraries which category of component each library6 h) p; c( G! E. W- i, s
covers or any other specifics, and what begining letter stands for.
1 ]% h+ W' p: c
2 G; M( R3 \- F5 j* |0 @In LP Viewer found PLB library files:
$ q6 y( f9 l7 K6 s7 U4 T& Y7 P ; `1 ]# ]! _9 X7 D" x. ?
PCBM-STARTER.PLB091 k' o0 M1 h! _: B; S1 ]" S
BGA7351B.PLB09
8 ?- v( P- u! e% W& g' h* x% vSMN7351B.PLB09
4 r/ s3 i# o* {9 O. z( }SMM7351B.PLB09
) _" u" C6 D1 R% DSML7351B.PLB09
' u5 s0 f( `: d% n! hCNA7251.PLB09
  [% }* a! M+ `+ \: Q7 gCNB7251.PLB09 2 C# I% J+ t8 H0 g$ ?! b9 w
CNC7251.PLB09
. g/ e5 Q' C! CCNP7251.PLB09
2 l, X! \* a* Y/ e' qTHA7251.PLB09
( `* R. d9 O% [1 O4 [8 y- W  fTHB7251.PLB09
5 C: G* b! K! s, E% U0 mTHC7251.PLB09  o) I1 n1 W6 o
THP7251.PLB093 d% A# }1 t2 V

$ R5 k! `1 h6 @1 e; G . _: x# n3 ~8 q7 h
Answer7 k7 T" p% S( D) k' Z5 s6 r- z4 _

# y4 J5 i: N! @" H4 gPCBM-STARTER = BGA & SMN combined with Mfr data added.9 a- U' `. Y( ?
/ u2 ^* f2 p4 p5 @
CN = Connectors+ ?' I; C) W/ P
7 f. u2 L3 d/ k2 n6 Y
TH = Through-hole6 z1 S  z) I# @. ]3 U) q
; x1 r/ O" B/ @
SM = Surface Mount" J9 u- @% _2 A& Z0 k8 _3 w
/ ~, P: K/ }5 y3 R# k% N2 }( m
A = Most Annular Ring for Through-hole8 q" v2 ?8 u# l" [; G  X
B = Nominal Annular Ring for Through-hole; [& w" N7 C" a+ T5 Z) m
C = Least Annular Ring for Through-hole
. a1 \* x. k4 O3 \9 }7 JP = Proportional (The Annular Ring grows larger as the hole gets bigger for Through-hole)
& f( d4 |! @! c8 L$ e5 s  f $ [# n( ^% U- t
SML = Least SMT Pad
) n4 |/ H  k, G3 w) Q" G* ySMN = Nominal SMT Pad# P/ f  m9 F5 H& |5 ]
SMM = Most SMT Pad1 `( Z- T- x" B( j

; s5 x/ K7 b, W7 O& e6 n! sBGA only comes in "Nominal" format! D/ }2 R( I+ X8 R6 e6 o2 |- e" t! _
! @+ D6 k/ q8 d$ p% e* {5 ^; k
这里的Most ,Nominal , Least说的是封装在制作时的一个思维标准。Most 用于密度小的板子（pad 尺寸最大），Nominal用于密度适中的（pad尺寸中等），Least适用于密度大板子（pad尺寸最小）。



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