參數(shù)資料
型號: AD8155ACPZ-R7
廠商: Analog Devices Inc
文件頁數(shù): 26/36頁
文件大?。?/td> 0K
描述: IC MUX/DEMUX DUAL BUFFER 64LFCSP
標(biāo)準(zhǔn)包裝: 750
系列: XStream™
功能: 多路復(fù)用器/多路分解器
電路: 2 x 2:1
電壓電源: 單電源
電壓 - 電源,單路/雙路(±): 1.6 V ~ 3.6 V
電流 - 電源: 735mA
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 64-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 64-LFCSP-VQ(9x9)
包裝: 帶卷 (TR)
AD8155
Rev. 0 | Page 32 of 36
1.35mm × 1.35mm SQUARES
AT 1.65mm PITCH
R
COVERAGE: 68%
08
26
2-
0
51
Figure 50.Typical Thermal Paddle Stencil Design
Large voids in the thermal paddle area should be avoided. To
control voids in the thermal paddle area, solder masking may be
required for thermal vias to prevent solder wicking inside the
via during reflow, thus displacing the solder away from the
interface between the package thermal paddle and thermal
paddle land on the PCB. There are several methods employed
for this purpose, such as via tenting (top or bottom side), using
dry film solder mask; via plugging with liquid photo-imagible
(LPI) solder mask from the bottom side; or via encroaching.
These options are depicted in Figure 51. In case of via tenting,
the solder mask diameter should be 100 microns larger than the
via diameter.
(A)
(B)
(D)
(C)
VIA
SOLDER
MASK
COPPE
PLATING
08
26
2-
0
52
Figure 51. Solder Mask Options for Thermal Vias: (a) Via Tenting from the
Top; (b) Via Tenting from the Bottom; (c)Via Plugging, Bottom; and (d) Via
Encroaching, Bottom
A stencil thickness of 0.125 mm is recommended for 0.4 mm and
0.5 mm pitch parts. The stencil thickness can be increased to
0.15 mm to 0.2 mm for coarser pitch parts. A laser-cut, stainless
steel stencil is recommended with electropolished trapezoidal
walls to improve the paste release. Because not enough space is
available underneath the part after reflow, it is recommended
that no clean Type 3 paste be used for mounting the LFCSP.
Inert atmosphere is also recommended during reflow.
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