參數(shù)資料
型號(hào)： 935265467112
廠商： NXP SEMICONDUCTORS
元件分類： 編、解碼器及復(fù)用、解復(fù)用
英文描述： AHC SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDSO16
封裝： 3.90 MM, PLASTIC, MS-012, SOT-109-1, SO-16
文件頁(yè)數(shù)： 7/20頁(yè)
文件大?。?/td> 89K
代理商： 935265467112
2000 Apr 03
15
Philips Semiconductors
Product specication
Quad 2-input multiplexer; 3-state
74AHC257;
74AHCT257
Suitability of surface mount IC packages for wave and reow soldering methods
Notes
1. 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”.
2. These packages are not suitable for wave soldering as a solder joint between the printed-circuit board and heatsink
(at bottom version) can not be achieved, and as solder may stick to the heatsink (on top version).
3. 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.
4. Wave soldering is only suitable for LQFP, TQFP and QFP packages with a pitch (e) equal to or larger than 0.8 mm;
it is definitely not suitable for packages with a pitch (e) equal to or smaller than 0.65 mm.
5. Wave soldering is only suitable for SSOP and TSSOP 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.
PACKAGE
SOLDERING METHOD
WAVE
REFLOW(1)
BGA, LFBGA, SQFP, TFBGA
not suitable
suitable
HBCC, HLQFP, HSQFP, HSOP, HTQFP, HTSSOP, SMS
not suitable(2)
suitable
PLCC(3), SO, SOJ
suitable
LQFP, QFP, TQFP
not recommended(3)(4)
suitable
SSOP, TSSOP, VSO
not recommended(5)
suitable
相關(guān)PDF資料
PDF描述
08-65-0109 BRASS, GOLD FINISH, WIRE TERMINAL
08-50-0061 BRASS, WIRE TERMINAL
08-50-0062 BRASS, WIRE TERMINAL
08-50-0065 BRASS, WIRE TERMINAL
08-50-0066 BRASS, WIRE TERMINAL
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