参数资料
型号: AD8155ACPZ
厂商: Analog Devices Inc
文件页数: 26/36页
文件大小: 0K
描述: IC MUX/DEMUX DUAL BUFFER 64LFCSP
标准包装: 1
系列: XStream™
功能: 多路复用器/多路分解器
电路: 2 x 2:1
电压电源: 单电源
电压 - 电源,单路/双路(±): 1.6 V ~ 3.6 V
电流 - 电源: 735mA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 64-VFQFN 裸露焊盘,CSP
供应商设备封装: 64-LFCSP-VQ(9x9)
包装: 托盘
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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