參數(shù)資料
型號(hào)： PCA2002T
廠商： NXP SEMICONDUCTORS
元件分類： 時(shí)鐘及定時(shí)
英文描述： 32 kHz watch circuit with programmable output period and pulse width
中文描述： STEPPING MOTOR WATCH, PDFP8
封裝： PLASTIC, SOT-144-1, MFP-8
文件頁(yè)數(shù)： 17/20頁(yè)
文件大?。?/td> 124K
代理商： PCA2002T
2004 Jan 20
17
Philips Semiconductors
Product specification
32 kHz watch circuit with programmable
output period and pulse width
PCA2002
Suitability of surface mount IC packages for wave and reflow soldering methods
Notes
1.
For more detailed information on the BGA packages refer to the“(LF)BGA Application Note” (AN01026); order a copy
from your Philips Semiconductors sales office.
All surface mount (SMD) packages are moisture sensitive. Depending upon the moisture content, the maximum
temperature (with respect to time) and body size of the package, there is a risk that internal or external package
cracks may occur due to vaporization of the moisture in them (the so called popcorn effect). For details, refer to the
Drypack information in the “Data Handbook IC26; Integrated Circuit Packages; Section: Packing Methods”
These transparent plastic packages are extremely sensitive to reflow soldering conditions and must on no account
be processed through more than one soldering cycle or subjected to infrared reflow soldering with peak temperature
exceeding 217
°
C
±
10
°
C measured in the atmosphere of the reflow oven. The package body peak temperature
must be kept as low as possible.
These packages are not suitable for wave soldering. On versions with the heatsink on the bottom side, the solder
cannot penetrate between the printed-circuit board and the heatsink. On versions with the heatsink on the top side,
the solder might be deposited on the heatsink surface.
If wave soldering is considered, then the package must be placed at a 45
°
angle to the solder wave direction.
The package footprint must incorporate solder thieves downstream and at the side corners.
Wave soldering is suitable for LQFP, TQFP and QFP packages with a pitch (e) larger than 0.8 mm; it is definitely not
suitable for packages with a pitch (e) equal to or smaller than 0.65 mm.
Wave soldering is suitable for SSOP, TSSOP, VSO and VSSOP packages with a pitch (e) equal to or larger than
0.65 mm; it is definitely not suitable for packages with a pitch (e) equal to or smaller than 0.5 mm.
Image sensor packages in principle should not be soldered. They are mounted in sockets or delivered pre-mounted
on flex foil. However, the image sensor package can be mounted by the client on a flex foil by using a hot bar
soldering process. The appropriate soldering profile can be provided on request.
Hot bar or manual soldering is suitable for PMFP packages.
2.
3.
4.
5.
6.
7.
8.
9.
PACKAGE
(1)
SOLDERING METHOD
WAVE
REFLOW
(2)
BGA, HTSSON..T
(3)
, LBGA, LFBGA, SQFP, SSOP..T
(3)
, TFBGA,
USON, VFBGA
DHVQFN, HBCC, HBGA, HLQFP, HSO, HSOP, HSQFP, HSSON,
HTQFP, HTSSOP, HVQFN, HVSON, SMS
PLCC
(5)
, SO, SOJ
LQFP, QFP, TQFP
SSOP, TSSOP, VSO, VSSOP
CWQCCN..L
(8)
, PMFP
(9)
, WQCCN..L
(8)
not suitable
suitable
not suitable
(4)
suitable
suitable
not recommended
(5)(6)
not recommended
(7)
not suitable
suitable
suitable
suitable
not suitable
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